Version abc70930

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diff --git a/abc70930/src/aig/aig/aig.h b/abc70930/src/aig/aig/aig.h
new file mode 100644
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+++ b/abc70930/src/aig/aig/aig.h
@@ -0,0 +1,553 @@
+/**CFile****************************************************************
+
+  FileName    [aig.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aig.h,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __AIG_H__
+#define __AIG_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "vec.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Aig_Man_t_            Aig_Man_t;
+typedef struct Aig_Obj_t_            Aig_Obj_t;
+typedef struct Aig_MmFixed_t_        Aig_MmFixed_t;    
+typedef struct Aig_MmFlex_t_         Aig_MmFlex_t;     
+typedef struct Aig_MmStep_t_         Aig_MmStep_t;     
+typedef struct Aig_TMan_t_           Aig_TMan_t;
+
+// object types
+typedef enum { 
+    AIG_OBJ_NONE,                    // 0: non-existent object
+    AIG_OBJ_CONST1,                  // 1: constant 1 
+    AIG_OBJ_PI,                      // 2: primary input
+    AIG_OBJ_PO,                      // 3: primary output
+    AIG_OBJ_BUF,                     // 4: buffer node
+    AIG_OBJ_AND,                     // 5: AND node
+    AIG_OBJ_EXOR,                    // 6: EXOR node
+    AIG_OBJ_LATCH,                   // 7: latch
+    AIG_OBJ_VOID                     // 8: unused object
+} Aig_Type_t;
+
+// the AIG node
+struct Aig_Obj_t_  // 8 words
+{
+    Aig_Obj_t *      pNext;          // strashing table
+    Aig_Obj_t *      pFanin0;        // fanin
+    Aig_Obj_t *      pFanin1;        // fanin
+    unsigned int     Type    :  3;   // object type
+    unsigned int     fPhase  :  1;   // value under 000...0 pattern
+    unsigned int     fMarkA  :  1;   // multipurpose mask
+    unsigned int     fMarkB  :  1;   // multipurpose mask
+    unsigned int     nRefs   : 26;   // reference count 
+    unsigned         Level   : 24;   // the level of this node
+    unsigned         nCuts   :  8;   // the number of cuts
+    int              TravId;         // unique ID of last traversal involving the node
+    int              Id;             // unique ID of the node
+    union {                          // temporary store for user's data
+        void *       pData;
+        int          iData;
+        float        dData;
+    };
+};
+
+// the AIG manager
+struct Aig_Man_t_
+{
+    char *           pName;          // the design name
+    // AIG nodes
+    Vec_Ptr_t *      vPis;           // the array of PIs
+    Vec_Ptr_t *      vPos;           // the array of POs
+    Vec_Ptr_t *      vObjs;          // the array of all nodes (optional)
+    Vec_Ptr_t *      vBufs;          // the array of buffers
+    Aig_Obj_t *      pConst1;        // the constant 1 node
+    Aig_Obj_t        Ghost;          // the ghost node
+    int              nRegs;          // the number of registers (registers are last POs)
+    int              nAsserts;       // the number of asserts among POs (asserts are first POs)
+    // AIG node counters
+    int              nObjs[AIG_OBJ_VOID];// the number of objects by type
+    int              nCreated;       // the number of created objects
+    int              nDeleted;       // the number of deleted objects
+    // structural hash table
+    Aig_Obj_t **     pTable;         // structural hash table
+    int              nTableSize;     // structural hash table size
+    // representation of fanouts
+    int *            pFanData;       // the database to store fanout information
+    int              nFansAlloc;     // the size of fanout representation
+    Vec_Vec_t *      vLevels;        // used to update timing information
+    int              nBufReplaces;   // the number of times replacement led to a buffer
+    int              nBufFixes;      // the number of times buffers were propagated
+    int              nBufMax;        // the maximum number of buffers during computation
+    // topological order
+    unsigned *       pOrderData;
+    int              nOrderAlloc;
+    int              iPrev;
+    int              iNext;
+    int              nAndTotal;
+    int              nAndPrev;
+    // representatives
+    Aig_Obj_t **     pEquivs;        // linked list of equivalent nodes (when choices are used)
+    Aig_Obj_t **     pReprs;         // representatives of each node
+    int              nReprsAlloc;    // the number of allocated representatives
+    // various data members
+    Aig_MmFixed_t *  pMemObjs;       // memory manager for objects
+    Vec_Int_t *      vLevelR;        // the reverse level of the nodes
+    int              nLevelMax;      // maximum number of levels
+    void *           pData;          // the temporary data
+    int              nTravIds;       // the current traversal ID
+    int              fCatchExor;     // enables EXOR nodes
+    int              fAddStrash;     // performs additional strashing
+    Aig_Obj_t **     pObjCopies;     // mapping of AIG nodes into FRAIG nodes
+    void (*pImpFunc) (void*, void*); // implication checking precedure
+    void *           pImpData;       // implication checking data
+    Aig_TMan_t *     pManTime;       // the timing manager
+    Vec_Ptr_t *      vMapped;
+    Vec_Int_t *      vFlopNums;      
+    // timing statistics
+    int              time1;
+    int              time2;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+#define AIG_MIN(a,b)       (((a) < (b))? (a) : (b))
+#define AIG_MAX(a,b)       (((a) > (b))? (a) : (b))
+#define AIG_ABS(a)         (((a) >= 0)?  (a) :-(a))
+#define AIG_INFINITY       (100000000)
+
+#ifndef PRT
+#define PRT(a,t)  printf("%s = ", (a)); printf("%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC))
+#endif
+
+static inline int          Aig_Base2Log( unsigned n )             { int r; assert( n >= 0 ); if ( n < 2 ) return n; for ( r = 0, n--; n; n >>= 1, r++ ); return r; }
+static inline int          Aig_Base10Log( unsigned n )            { int r; assert( n >= 0 ); if ( n < 2 ) return n; for ( r = 0, n--; n; n /= 10, r++ ); return r; }
+static inline char *       Aig_UtilStrsav( char * s )             { return s ? strcpy(ALLOC(char, strlen(s)+1), s) : NULL; }
+static inline int          Aig_BitWordNum( int nBits )            { return (nBits>>5) + ((nBits&31) > 0);                  }
+static inline int          Aig_TruthWordNum( int nVars )          { return nVars <= 5 ? 1 : (1 << (nVars - 5));            }
+static inline int          Aig_InfoHasBit( unsigned * p, int i )  { return (p[(i)>>5] & (1<<((i) & 31))) > 0;              }
+static inline void         Aig_InfoSetBit( unsigned * p, int i )  { p[(i)>>5] |= (1<<((i) & 31));                          }
+static inline void         Aig_InfoXorBit( unsigned * p, int i )  { p[(i)>>5] ^= (1<<((i) & 31));                          }
+static inline unsigned     Aig_InfoMask( int nVar )               { return (~(unsigned)0) >> (32-nVar);                    }
+static inline unsigned     Aig_ObjCutSign( unsigned ObjId )       { return (1 << (ObjId & 31));                            }
+static inline int          Aig_WordCountOnes( unsigned uWord )
+{
+    uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
+    uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
+    uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
+    uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
+    return  (uWord & 0x0000FFFF) + (uWord>>16);
+}
+
+static inline Aig_Obj_t *  Aig_Regular( Aig_Obj_t * p )           { return (Aig_Obj_t *)((unsigned long)(p) & ~01); }
+static inline Aig_Obj_t *  Aig_Not( Aig_Obj_t * p )               { return (Aig_Obj_t *)((unsigned long)(p) ^  01); }
+static inline Aig_Obj_t *  Aig_NotCond( Aig_Obj_t * p, int c )    { return (Aig_Obj_t *)((unsigned long)(p) ^ (c)); }
+static inline int          Aig_IsComplement( Aig_Obj_t * p )      { return (int )(((unsigned long)p) & 01);         }
+
+static inline int          Aig_ManPiNum( Aig_Man_t * p )          { return p->nObjs[AIG_OBJ_PI];                    }
+static inline int          Aig_ManPoNum( Aig_Man_t * p )          { return p->nObjs[AIG_OBJ_PO];                    }
+static inline int          Aig_ManBufNum( Aig_Man_t * p )         { return p->nObjs[AIG_OBJ_BUF];                   }
+static inline int          Aig_ManAndNum( Aig_Man_t * p )         { return p->nObjs[AIG_OBJ_AND];                   }
+static inline int          Aig_ManExorNum( Aig_Man_t * p )        { return p->nObjs[AIG_OBJ_EXOR];                  }
+static inline int          Aig_ManLatchNum( Aig_Man_t * p )       { return p->nObjs[AIG_OBJ_LATCH];                 }
+static inline int          Aig_ManNodeNum( Aig_Man_t * p )        { return p->nObjs[AIG_OBJ_AND]+p->nObjs[AIG_OBJ_EXOR];   }
+static inline int          Aig_ManGetCost( Aig_Man_t * p )        { return p->nObjs[AIG_OBJ_AND]+3*p->nObjs[AIG_OBJ_EXOR]; }
+static inline int          Aig_ManObjNum( Aig_Man_t * p )         { return p->nCreated - p->nDeleted;               }
+static inline int          Aig_ManObjNumMax( Aig_Man_t * p )      { return Vec_PtrSize(p->vObjs);                   }
+static inline int          Aig_ManRegNum( Aig_Man_t * p )         { return p->nRegs;                                }
+
+static inline Aig_Obj_t *  Aig_ManConst0( Aig_Man_t * p )         { return Aig_Not(p->pConst1);                     }
+static inline Aig_Obj_t *  Aig_ManConst1( Aig_Man_t * p )         { return p->pConst1;                              }
+static inline Aig_Obj_t *  Aig_ManGhost( Aig_Man_t * p )          { return &p->Ghost;                               }
+static inline Aig_Obj_t *  Aig_ManPi( Aig_Man_t * p, int i )      { return (Aig_Obj_t *)Vec_PtrEntry(p->vPis, i);   }
+static inline Aig_Obj_t *  Aig_ManPo( Aig_Man_t * p, int i )      { return (Aig_Obj_t *)Vec_PtrEntry(p->vPos, i);   }
+static inline Aig_Obj_t *  Aig_ManLo( Aig_Man_t * p, int i )      { return (Aig_Obj_t *)Vec_PtrEntry(p->vPis, Aig_ManPiNum(p)-Aig_ManRegNum(p)+i);   }
+static inline Aig_Obj_t *  Aig_ManLi( Aig_Man_t * p, int i )      { return (Aig_Obj_t *)Vec_PtrEntry(p->vPos, Aig_ManPoNum(p)-Aig_ManRegNum(p)+i);   }
+static inline Aig_Obj_t *  Aig_ManObj( Aig_Man_t * p, int i )     { return p->vObjs ? (Aig_Obj_t *)Vec_PtrEntry(p->vObjs, i) : NULL;  }
+
+static inline Aig_Type_t   Aig_ObjType( Aig_Obj_t * pObj )        { return (Aig_Type_t)pObj->Type;       }
+static inline int          Aig_ObjIsNone( Aig_Obj_t * pObj )      { return pObj->Type == AIG_OBJ_NONE;   }
+static inline int          Aig_ObjIsConst1( Aig_Obj_t * pObj )    { assert(!Aig_IsComplement(pObj)); return pObj->Type == AIG_OBJ_CONST1; }
+static inline int          Aig_ObjIsPi( Aig_Obj_t * pObj )        { return pObj->Type == AIG_OBJ_PI;     }
+static inline int          Aig_ObjIsPo( Aig_Obj_t * pObj )        { return pObj->Type == AIG_OBJ_PO;     }
+static inline int          Aig_ObjIsBuf( Aig_Obj_t * pObj )       { return pObj->Type == AIG_OBJ_BUF;    }
+static inline int          Aig_ObjIsAnd( Aig_Obj_t * pObj )       { return pObj->Type == AIG_OBJ_AND;    }
+static inline int          Aig_ObjIsExor( Aig_Obj_t * pObj )      { return pObj->Type == AIG_OBJ_EXOR;   }
+static inline int          Aig_ObjIsLatch( Aig_Obj_t * pObj )     { return pObj->Type == AIG_OBJ_LATCH;  }
+static inline int          Aig_ObjIsNode( Aig_Obj_t * pObj )      { return pObj->Type == AIG_OBJ_AND || pObj->Type == AIG_OBJ_EXOR;   }
+static inline int          Aig_ObjIsTerm( Aig_Obj_t * pObj )      { return pObj->Type == AIG_OBJ_PI  || pObj->Type == AIG_OBJ_PO || pObj->Type == AIG_OBJ_CONST1;   }
+static inline int          Aig_ObjIsHash( Aig_Obj_t * pObj )      { return pObj->Type == AIG_OBJ_AND || pObj->Type == AIG_OBJ_EXOR || pObj->Type == AIG_OBJ_LATCH;  }
+static inline int          Aig_ObjIsChoice( Aig_Man_t * p, Aig_Obj_t * pObj )    { return p->pEquivs && p->pEquivs[pObj->Id] && pObj->nRefs > 0;                    }
+
+static inline int          Aig_ObjIsMarkA( Aig_Obj_t * pObj )     { return pObj->fMarkA;  }
+static inline void         Aig_ObjSetMarkA( Aig_Obj_t * pObj )    { pObj->fMarkA = 1;     }
+static inline void         Aig_ObjClearMarkA( Aig_Obj_t * pObj )  { pObj->fMarkA = 0;     }
+ 
+static inline void         Aig_ObjSetTravId( Aig_Obj_t * pObj, int TravId )                { pObj->TravId = TravId;                         }
+static inline void         Aig_ObjSetTravIdCurrent( Aig_Man_t * p, Aig_Obj_t * pObj )      { pObj->TravId = p->nTravIds;                    }
+static inline void         Aig_ObjSetTravIdPrevious( Aig_Man_t * p, Aig_Obj_t * pObj )     { pObj->TravId = p->nTravIds - 1;                }
+static inline int          Aig_ObjIsTravIdCurrent( Aig_Man_t * p, Aig_Obj_t * pObj )       { return (int)(pObj->TravId == p->nTravIds);     }
+static inline int          Aig_ObjIsTravIdPrevious( Aig_Man_t * p, Aig_Obj_t * pObj )      { return (int)(pObj->TravId == p->nTravIds - 1); }
+
+static inline int          Aig_ObjPhase( Aig_Obj_t * pObj )       { return pObj->fPhase;                           }
+static inline int          Aig_ObjPhaseReal( Aig_Obj_t * pObj )   { return pObj? Aig_Regular(pObj)->fPhase ^ Aig_IsComplement(pObj) : 1;                              }
+static inline int          Aig_ObjRefs( Aig_Obj_t * pObj )        { return pObj->nRefs;                            }
+static inline void         Aig_ObjRef( Aig_Obj_t * pObj )         { pObj->nRefs++;                                 }
+static inline void         Aig_ObjDeref( Aig_Obj_t * pObj )       { assert( pObj->nRefs > 0 ); pObj->nRefs--;      }
+static inline void         Aig_ObjClearRef( Aig_Obj_t * pObj )    { pObj->nRefs = 0;                               }
+static inline int          Aig_ObjFaninId0( Aig_Obj_t * pObj )    { return pObj->pFanin0? Aig_Regular(pObj->pFanin0)->Id : -1; }
+static inline int          Aig_ObjFaninId1( Aig_Obj_t * pObj )    { return pObj->pFanin1? Aig_Regular(pObj->pFanin1)->Id : -1; }
+static inline int          Aig_ObjFaninC0( Aig_Obj_t * pObj )     { return Aig_IsComplement(pObj->pFanin0);        }
+static inline int          Aig_ObjFaninC1( Aig_Obj_t * pObj )     { return Aig_IsComplement(pObj->pFanin1);        }
+static inline Aig_Obj_t *  Aig_ObjFanin0( Aig_Obj_t * pObj )      { return Aig_Regular(pObj->pFanin0);             }
+static inline Aig_Obj_t *  Aig_ObjFanin1( Aig_Obj_t * pObj )      { return Aig_Regular(pObj->pFanin1);             }
+static inline Aig_Obj_t *  Aig_ObjChild0( Aig_Obj_t * pObj )      { return pObj->pFanin0;                          }
+static inline Aig_Obj_t *  Aig_ObjChild1( Aig_Obj_t * pObj )      { return pObj->pFanin1;                          }
+static inline Aig_Obj_t *  Aig_ObjChild0Copy( Aig_Obj_t * pObj )  { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin0(pObj)? Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj)) : NULL;  }
+static inline Aig_Obj_t *  Aig_ObjChild1Copy( Aig_Obj_t * pObj )  { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin1(pObj)? Aig_NotCond((Aig_Obj_t *)Aig_ObjFanin1(pObj)->pData, Aig_ObjFaninC1(pObj)) : NULL;  }
+static inline int          Aig_ObjLevel( Aig_Obj_t * pObj )       { return pObj->Level;                            }
+static inline int          Aig_ObjLevelNew( Aig_Obj_t * pObj )    { return Aig_ObjFanin1(pObj)? 1 + Aig_ObjIsExor(pObj) + AIG_MAX(Aig_ObjFanin0(pObj)->Level, Aig_ObjFanin1(pObj)->Level) : Aig_ObjFanin0(pObj)->Level; }
+static inline void         Aig_ObjClean( Aig_Obj_t * pObj )       { memset( pObj, 0, sizeof(Aig_Obj_t) );                                                             }
+static inline Aig_Obj_t *  Aig_ObjFanout0( Aig_Man_t * p, Aig_Obj_t * pObj )  { assert(p->pFanData && pObj->Id < p->nFansAlloc); return Aig_ManObj(p, p->pFanData[5*pObj->Id] >> 1); } 
+static inline Aig_Obj_t *  Aig_ObjEquiv( Aig_Man_t * p, Aig_Obj_t * pObj )    { return p->pEquivs? p->pEquivs[pObj->Id] : NULL; } 
+static inline int          Aig_ObjWhatFanin( Aig_Obj_t * pObj, Aig_Obj_t * pFanin )    
+{ 
+    if ( Aig_ObjFanin0(pObj) == pFanin ) return 0; 
+    if ( Aig_ObjFanin1(pObj) == pFanin ) return 1; 
+    assert(0); return -1; 
+}
+static inline int          Aig_ObjFanoutC( Aig_Obj_t * pObj, Aig_Obj_t * pFanout )    
+{ 
+    if ( Aig_ObjFanin0(pFanout) == pObj ) return Aig_ObjFaninC0(pObj); 
+    if ( Aig_ObjFanin1(pFanout) == pObj ) return Aig_ObjFaninC1(pObj); 
+    assert(0); return -1; 
+}
+
+// create the ghost of the new node
+static inline Aig_Obj_t *  Aig_ObjCreateGhost( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Type_t Type )    
+{
+    Aig_Obj_t * pGhost;
+    assert( Type != AIG_OBJ_AND || !Aig_ObjIsConst1(Aig_Regular(p0)) );
+    assert( p1 == NULL || !Aig_ObjIsConst1(Aig_Regular(p1)) );
+    assert( Type == AIG_OBJ_PI || Aig_Regular(p0) != Aig_Regular(p1) );
+    pGhost = Aig_ManGhost(p);
+    pGhost->Type = Type;
+    if ( p1 == NULL || Aig_Regular(p0)->Id < Aig_Regular(p1)->Id )
+    {
+        pGhost->pFanin0 = p0;
+        pGhost->pFanin1 = p1;
+    }
+    else
+    {
+        pGhost->pFanin0 = p1;
+        pGhost->pFanin1 = p0;
+    }
+    return pGhost;
+}
+
+// internal memory manager
+static inline Aig_Obj_t * Aig_ManFetchMemory( Aig_Man_t * p )  
+{
+    extern char * Aig_MmFixedEntryFetch( Aig_MmFixed_t * p );
+    Aig_Obj_t * pTemp;
+    pTemp = (Aig_Obj_t *)Aig_MmFixedEntryFetch( p->pMemObjs );
+    memset( pTemp, 0, sizeof(Aig_Obj_t) ); 
+    Vec_PtrPush( p->vObjs, pTemp );
+    pTemp->Id = p->nCreated++;
+    return pTemp;
+}
+static inline void Aig_ManRecycleMemory( Aig_Man_t * p, Aig_Obj_t * pEntry )
+{
+    extern void Aig_MmFixedEntryRecycle( Aig_MmFixed_t * p, char * pEntry );
+    assert( pEntry->nRefs == 0 );
+    pEntry->Type = AIG_OBJ_NONE; // distinquishes a dead node from a live node
+    Aig_MmFixedEntryRecycle( p->pMemObjs, (char *)pEntry );
+    p->nDeleted++;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over the primary inputs
+#define Aig_ManForEachPi( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPis, pObj, i )
+// iterator over the primary outputs
+#define Aig_ManForEachPo( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPos, pObj, i )
+// iterator over the assertions
+#define Aig_ManForEachAssert( p, pObj, i )                                      \
+    Vec_PtrForEachEntryStart( p->vPos, pObj, i, Aig_ManPoNum(p)-p->nAsserts )
+// iterator over all objects, including those currently not used
+#define Aig_ManForEachObj( p, pObj, i )                                         \
+    Vec_PtrForEachEntry( p->vObjs, pObj, i ) if ( (pObj) == NULL ) {} else
+// iterator over all nodes
+#define Aig_ManForEachNode( p, pObj, i )                                        \
+    Vec_PtrForEachEntry( p->vObjs, pObj, i ) if ( (pObj) == NULL || !Aig_ObjIsNode(pObj) ) {} else
+// iterator over the nodes whose IDs are stored in the array
+#define Aig_ManForEachNodeVec( p, vIds, pObj, i )                               \
+    for ( i = 0; i < Vec_IntSize(vIds) && ((pObj) = Aig_ManObj(p, Vec_IntEntry(vIds,i))); i++ )
+// iterator over the nodes in the topological order
+#define Aig_ManForEachNodeInOrder( p, pObj )                                    \
+    for ( assert(p->pOrderData), p->iPrev = 0, p->iNext = p->pOrderData[1];     \
+          p->iNext && (((pObj) = Aig_ManObj(p, p->iNext)), 1);                  \
+          p->iNext = p->pOrderData[2*p->iPrev+1] )
+
+// these two procedures are only here for the use inside the iterator
+static inline int     Aig_ObjFanout0Int( Aig_Man_t * p, int ObjId )  { assert(ObjId < p->nFansAlloc);  return p->pFanData[5*ObjId];                         }
+static inline int     Aig_ObjFanoutNext( Aig_Man_t * p, int iFan )   { assert(iFan/2 < p->nFansAlloc); return p->pFanData[5*(iFan >> 1) + 3 + (iFan & 1)];  }
+// iterator over the fanouts
+#define Aig_ObjForEachFanout( p, pObj, pFanout, iFan, i )                       \
+    for ( assert(p->pFanData), i = 0; (i < (int)(pObj)->nRefs) &&               \
+          (((iFan) = i? Aig_ObjFanoutNext(p, iFan) : Aig_ObjFanout0Int(p, pObj->Id)), 1) && \
+          (((pFanout) = Aig_ManObj(p, iFan>>1)), 1); i++ )
+
+
+////////////////////////////////////////////////////////////////////////
+///                     SEQUENTIAL ITERATORS                         ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over the primary inputs
+#define Aig_ManForEachPiSeq( p, pObj, i )                                       \
+    Vec_PtrForEachEntryStop( p->vPis, pObj, i, Aig_ManPiNum(p)-Aig_ManRegNum(p) )
+// iterator over the latch outputs
+#define Aig_ManForEachLoSeq( p, pObj, i )                                       \
+    Vec_PtrForEachEntryStart( p->vPis, pObj, i, Aig_ManPiNum(p)-Aig_ManRegNum(p) )
+// iterator over the primary outputs
+#define Aig_ManForEachPoSeq( p, pObj, i )                                       \
+    Vec_PtrForEachEntryStop( p->vPos, pObj, i, Aig_ManPoNum(p)-Aig_ManRegNum(p) )
+// iterator over the latch inputs
+#define Aig_ManForEachLiSeq( p, pObj, i )                                       \
+    Vec_PtrForEachEntryStart( p->vPos, pObj, i, Aig_ManPoNum(p)-Aig_ManRegNum(p) )
+// iterator over the latch input and outputs
+#define Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, k )                           \
+    for ( k = 0; (k < Aig_ManRegNum(p)) && (((pObjLi) = Aig_ManLi(p, k)), 1)    \
+        && (((pObjLo)=Aig_ManLo(p, k)), 1); k++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== aigCheck.c ========================================================*/
+extern int             Aig_ManCheck( Aig_Man_t * p );
+extern void            Aig_ManCheckMarkA( Aig_Man_t * p );
+extern void            Aig_ManCheckPhase( Aig_Man_t * p );
+/*=== aigDfs.c ==========================================================*/
+extern Vec_Ptr_t *     Aig_ManDfs( Aig_Man_t * p );
+extern Vec_Ptr_t *     Aig_ManDfsNodes( Aig_Man_t * p, Aig_Obj_t ** ppNodes, int nNodes );
+extern Vec_Ptr_t *     Aig_ManDfsChoices( Aig_Man_t * p );
+extern Vec_Ptr_t *     Aig_ManDfsReverse( Aig_Man_t * p );
+extern int             Aig_ManLevelNum( Aig_Man_t * p );
+extern int             Aig_ManCountLevels( Aig_Man_t * p );
+extern int             Aig_DagSize( Aig_Obj_t * pObj );
+extern int             Aig_SupportSize( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern void            Aig_ConeUnmark_rec( Aig_Obj_t * pObj );
+extern Aig_Obj_t *     Aig_Transfer( Aig_Man_t * pSour, Aig_Man_t * pDest, Aig_Obj_t * pObj, int nVars );
+extern Aig_Obj_t *     Aig_Compose( Aig_Man_t * p, Aig_Obj_t * pRoot, Aig_Obj_t * pFunc, int iVar );
+extern void            Aig_ObjCollectCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes );
+extern int             Aig_ObjCollectSuper( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper );
+/*=== aigFanout.c ==========================================================*/
+extern void            Aig_ObjAddFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout );
+extern void            Aig_ObjRemoveFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout );
+extern void            Aig_ManFanoutStart( Aig_Man_t * p );
+extern void            Aig_ManFanoutStop( Aig_Man_t * p );
+/*=== aigMan.c ==========================================================*/
+extern Aig_Man_t *     Aig_ManStart( int nNodesMax );
+extern Aig_Man_t *     Aig_ManStartFrom( Aig_Man_t * p );
+extern Aig_Obj_t *     Aig_ManDup_rec( Aig_Man_t * pNew, Aig_Man_t * p, Aig_Obj_t * pObj );
+extern Aig_Man_t *     Aig_ManDup( Aig_Man_t * p, int fOrdered );
+extern Aig_Man_t *     Aig_ManExtractMiter( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 );
+extern void            Aig_ManStop( Aig_Man_t * p );
+extern int             Aig_ManCleanup( Aig_Man_t * p );
+extern void            Aig_ManPrintStats( Aig_Man_t * p );
+/*=== aigMem.c ==========================================================*/
+extern void            Aig_ManStartMemory( Aig_Man_t * p );
+extern void            Aig_ManStopMemory( Aig_Man_t * p );
+/*=== aigMffc.c ==========================================================*/
+extern int             Aig_NodeRef_rec( Aig_Obj_t * pNode, unsigned LevelMin );
+extern int             Aig_NodeDeref_rec( Aig_Obj_t * pNode, unsigned LevelMin );
+extern int             Aig_NodeMffsSupp( Aig_Man_t * p, Aig_Obj_t * pNode, int LevelMin, Vec_Ptr_t * vSupp );
+extern int             Aig_NodeMffsLabel( Aig_Man_t * p, Aig_Obj_t * pNode );
+extern int             Aig_NodeMffsLabelCut( Aig_Man_t * p, Aig_Obj_t * pNode, Vec_Ptr_t * vLeaves );
+extern int             Aig_NodeMffsExtendCut( Aig_Man_t * p, Aig_Obj_t * pNode, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vResult );
+/*=== aigObj.c ==========================================================*/
+extern Aig_Obj_t *     Aig_ObjCreatePi( Aig_Man_t * p );
+extern Aig_Obj_t *     Aig_ObjCreatePo( Aig_Man_t * p, Aig_Obj_t * pDriver );
+extern Aig_Obj_t *     Aig_ObjCreate( Aig_Man_t * p, Aig_Obj_t * pGhost );
+extern void            Aig_ObjConnect( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFan0, Aig_Obj_t * pFan1 );
+extern void            Aig_ObjDisconnect( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern void            Aig_ObjDelete( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern void            Aig_ObjDelete_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int fFreeTop );
+extern void            Aig_ObjPatchFanin0( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFaninNew );
+extern void            Aig_ObjReplace( Aig_Man_t * p, Aig_Obj_t * pObjOld, Aig_Obj_t * pObjNew, int fNodesOnly, int fUpdateLevel );
+/*=== aigOper.c =========================================================*/
+extern Aig_Obj_t *     Aig_IthVar( Aig_Man_t * p, int i );
+extern Aig_Obj_t *     Aig_Oper( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Type_t Type );
+extern Aig_Obj_t *     Aig_And( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 );
+extern Aig_Obj_t *     Aig_Latch( Aig_Man_t * p, Aig_Obj_t * pObj, int fInitOne );
+extern Aig_Obj_t *     Aig_Or( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 );
+extern Aig_Obj_t *     Aig_Exor( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 );
+extern Aig_Obj_t *     Aig_Mux( Aig_Man_t * p, Aig_Obj_t * pC, Aig_Obj_t * p1, Aig_Obj_t * p0 );
+extern Aig_Obj_t *     Aig_Maj( Aig_Man_t * p, Aig_Obj_t * pA, Aig_Obj_t * pB, Aig_Obj_t * pC );
+extern Aig_Obj_t *     Aig_Miter( Aig_Man_t * p, Vec_Ptr_t * vPairs );
+extern Aig_Obj_t *     Aig_MiterTwo( Aig_Man_t * p, Vec_Ptr_t * vNodes1, Vec_Ptr_t * vNodes2 );
+extern Aig_Obj_t *     Aig_CreateAnd( Aig_Man_t * p, int nVars );
+extern Aig_Obj_t *     Aig_CreateOr( Aig_Man_t * p, int nVars );
+extern Aig_Obj_t *     Aig_CreateExor( Aig_Man_t * p, int nVars );
+/*=== aigOrder.c =========================================================*/
+extern void            Aig_ManOrderStart( Aig_Man_t * p );
+extern void            Aig_ManOrderStop( Aig_Man_t * p );
+extern void            Aig_ObjOrderInsert( Aig_Man_t * p, int ObjId );
+extern void            Aig_ObjOrderRemove( Aig_Man_t * p, int ObjId );
+extern void            Aig_ObjOrderAdvance( Aig_Man_t * p );
+/*=== aigPart.c =========================================================*/
+extern Vec_Ptr_t *     Aig_ManSupports( Aig_Man_t * pMan );
+extern Vec_Ptr_t *     Aig_ManPartitionSmart( Aig_Man_t * p, int nPartSizeLimit, int fVerbose, Vec_Ptr_t ** pvPartSupps );
+extern Vec_Ptr_t *     Aig_ManPartitionNaive( Aig_Man_t * p, int nPartSize );
+extern Aig_Man_t *     Aig_ManChoicePartitioned( Vec_Ptr_t * vAigs, int nPartSize );
+/*=== aigRepr.c =========================================================*/
+extern void            Aig_ManReprStart( Aig_Man_t * p, int nIdMax );
+extern void            Aig_ManReprStop( Aig_Man_t * p );
+extern void            Aig_ObjCreateRepr( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 );
+extern void            Aig_ManTransferRepr( Aig_Man_t * pNew, Aig_Man_t * p );
+extern Aig_Man_t *     Aig_ManDupRepr( Aig_Man_t * p, int fOrdered );
+extern Aig_Man_t *     Aig_ManRehash( Aig_Man_t * p );
+extern void            Aig_ManMarkValidChoices( Aig_Man_t * p );
+/*=== aigRet.c ========================================================*/
+extern Aig_Man_t *     Rtm_ManRetime( Aig_Man_t * p, int fForward, int nStepsMax, int fVerbose );
+/*=== aigScl.c ==========================================================*/
+extern Aig_Man_t *     Aig_ManRemap( Aig_Man_t * p, Vec_Ptr_t * vMap );
+extern int             Aig_ManSeqCleanup( Aig_Man_t * p );
+extern int             Aig_ManCountMergeRegs( Aig_Man_t * p );
+extern Aig_Man_t *     Aig_ManReduceLaches( Aig_Man_t * p, int fVerbose );
+/*=== aigSeq.c ========================================================*/
+extern int             Aig_ManSeqStrash( Aig_Man_t * p, int nLatches, int * pInits );
+/*=== aigShow.c ========================================================*/
+extern void            Aig_ManShow( Aig_Man_t * pMan, int fHaig, Vec_Ptr_t * vBold );
+/*=== aigTable.c ========================================================*/
+extern Aig_Obj_t *     Aig_TableLookup( Aig_Man_t * p, Aig_Obj_t * pGhost );
+extern Aig_Obj_t *     Aig_TableLookupTwo( Aig_Man_t * p, Aig_Obj_t * pFanin0, Aig_Obj_t * pFanin1 );
+extern void            Aig_TableInsert( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern void            Aig_TableDelete( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern int             Aig_TableCountEntries( Aig_Man_t * p );
+extern void            Aig_TableProfile( Aig_Man_t * p );
+/*=== aigTiming.c ========================================================*/
+extern void            Aig_ObjClearReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern int             Aig_ObjRequiredLevel( Aig_Man_t * p, Aig_Obj_t * pObj );
+extern void            Aig_ManStartReverseLevels( Aig_Man_t * p, int nMaxLevelIncrease );
+extern void            Aig_ManStopReverseLevels( Aig_Man_t * p );
+extern void            Aig_ManUpdateLevel( Aig_Man_t * p, Aig_Obj_t * pObjNew );
+extern void            Aig_ManUpdateReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObjNew );
+extern void            Aig_ManVerifyLevel( Aig_Man_t * p );
+extern void            Aig_ManVerifyReverseLevel( Aig_Man_t * p );
+/*=== aigTruth.c ========================================================*/
+extern unsigned *      Aig_ManCutTruth( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes, Vec_Ptr_t * vTruthElem, Vec_Ptr_t * vTruthStore );
+/*=== aigTsim.c ========================================================*/
+extern Aig_Man_t *     Aig_ManConstReduce( Aig_Man_t * p, int fVerbose );
+/*=== aigUtil.c =========================================================*/
+extern unsigned        Aig_PrimeCudd( unsigned p );
+extern void            Aig_ManIncrementTravId( Aig_Man_t * p );
+extern int             Aig_ManLevels( Aig_Man_t * p );
+extern void            Aig_ManResetRefs( Aig_Man_t * p );
+extern void            Aig_ManCleanMarkA( Aig_Man_t * p );
+extern void            Aig_ManCleanMarkB( Aig_Man_t * p );
+extern void            Aig_ManCleanData( Aig_Man_t * p );
+extern void            Aig_ObjCleanData_rec( Aig_Obj_t * pObj );
+extern void            Aig_ObjCollectMulti( Aig_Obj_t * pFunc, Vec_Ptr_t * vSuper );
+extern int             Aig_ObjIsMuxType( Aig_Obj_t * pObj );
+extern int             Aig_ObjRecognizeExor( Aig_Obj_t * pObj, Aig_Obj_t ** ppFan0, Aig_Obj_t ** ppFan1 );
+extern Aig_Obj_t *     Aig_ObjRecognizeMux( Aig_Obj_t * pObj, Aig_Obj_t ** ppObjT, Aig_Obj_t ** ppObjE );
+extern Aig_Obj_t *     Aig_ObjReal_rec( Aig_Obj_t * pObj );
+extern void            Aig_ObjPrintEqn( FILE * pFile, Aig_Obj_t * pObj, Vec_Vec_t * vLevels, int Level );
+extern void            Aig_ObjPrintVerilog( FILE * pFile, Aig_Obj_t * pObj, Vec_Vec_t * vLevels, int Level );
+extern void            Aig_ObjPrintVerbose( Aig_Obj_t * pObj, int fHaig );
+extern void            Aig_ManPrintVerbose( Aig_Man_t * p, int fHaig );
+extern void            Aig_ManDump( Aig_Man_t * p );
+extern void            Aig_ManDumpBlif( Aig_Man_t * p, char * pFileName );
+extern void            Aig_ManDumpVerilog( Aig_Man_t * p, char * pFileName );
+/*=== aigWin.c =========================================================*/
+extern void            Aig_ManFindCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vFront, Vec_Ptr_t * vVisited, int nSizeLimit, int nFanoutLimit );
+ 
+/*=== aigMem.c ===========================================================*/
+// fixed-size-block memory manager
+extern Aig_MmFixed_t * Aig_MmFixedStart( int nEntrySize, int nEntriesMax );
+extern void            Aig_MmFixedStop( Aig_MmFixed_t * p, int fVerbose );
+extern char *          Aig_MmFixedEntryFetch( Aig_MmFixed_t * p );
+extern void            Aig_MmFixedEntryRecycle( Aig_MmFixed_t * p, char * pEntry );
+extern void            Aig_MmFixedRestart( Aig_MmFixed_t * p );
+extern int             Aig_MmFixedReadMemUsage( Aig_MmFixed_t * p );
+extern int             Aig_MmFixedReadMaxEntriesUsed( Aig_MmFixed_t * p );
+// flexible-size-block memory manager
+extern Aig_MmFlex_t *  Aig_MmFlexStart();
+extern void            Aig_MmFlexStop( Aig_MmFlex_t * p, int fVerbose );
+extern char *          Aig_MmFlexEntryFetch( Aig_MmFlex_t * p, int nBytes );
+extern void            Aig_MmFlexRestart( Aig_MmFlex_t * p );
+extern int             Aig_MmFlexReadMemUsage( Aig_MmFlex_t * p );
+// hierarchical memory manager
+extern Aig_MmStep_t *  Aig_MmStepStart( int nSteps );
+extern void            Aig_MmStepStop( Aig_MmStep_t * p, int fVerbose );
+extern char *          Aig_MmStepEntryFetch( Aig_MmStep_t * p, int nBytes );
+extern void            Aig_MmStepEntryRecycle( Aig_MmStep_t * p, char * pEntry, int nBytes );
+extern int             Aig_MmStepReadMemUsage( Aig_MmStep_t * p );
+
+/*=== aigTime.c ===========================================================*/
+extern Aig_TMan_t *    Aig_TManStart( int nPis, int nPos );
+extern void            Aig_TManStop( Aig_TMan_t * p );
+extern void            Aig_TManCreateBox( Aig_TMan_t * p, int * pPis, int nPis, int * pPos, int nPos, float * pPiTimes, float * pPoTimes );
+extern void            Aig_TManSetPiDelay( Aig_TMan_t * p, int iPi, float Delay );
+extern void            Aig_TManSetPoDelay( Aig_TMan_t * p, int iPo, float Delay );
+extern void            Aig_TManSetPiArrival( Aig_TMan_t * p, int iPi, float Delay );
+extern void            Aig_TManSetPoRequired( Aig_TMan_t * p, int iPo, float Delay );
+extern void            Aig_TManIncrementTravId( Aig_TMan_t * p );
+extern float           Aig_TManGetPiArrival( Aig_TMan_t * p, int iPi );
+extern float           Aig_TManGetPoRequired( Aig_TMan_t * p, int iPo );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/aig/aigCheck.c b/abc70930/src/aig/aig/aigCheck.c
new file mode 100644
index 00000000..8c53e635
--- /dev/null
+++ b/abc70930/src/aig/aig/aigCheck.c
@@ -0,0 +1,163 @@
+/**CFile****************************************************************
+ 
+  FileName    [aigCheck.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [AIG checking procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigCheck.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Checks the consistency of the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManCheck( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pObj2;
+    int i;
+    // check primary inputs
+    Aig_ManForEachPi( p, pObj, i )
+    {
+        if ( Aig_ObjFanin0(pObj) || Aig_ObjFanin1(pObj) )
+        {
+            printf( "Aig_ManCheck: The PI node \"%p\" has fanins.\n", pObj );
+            return 0;
+        }
+    }
+    // check primary outputs
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        if ( !Aig_ObjFanin0(pObj) )
+        {
+            printf( "Aig_ManCheck: The PO node \"%p\" has NULL fanin.\n", pObj );
+            return 0;
+        }
+        if ( Aig_ObjFanin1(pObj) )
+        {
+            printf( "Aig_ManCheck: The PO node \"%p\" has second fanin.\n", pObj );
+            return 0;
+        }
+    }
+    // check internal nodes
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( !Aig_ObjIsNode(pObj) )
+            continue;
+        if ( !Aig_ObjFanin0(pObj) || !Aig_ObjFanin1(pObj) )
+        {
+            printf( "Aig_ManCheck: The AIG has internal node \"%p\" with a NULL fanin.\n", pObj );
+            return 0;
+        }
+        if ( Aig_ObjFanin0(pObj)->Id >= Aig_ObjFanin1(pObj)->Id )
+        {
+            printf( "Aig_ManCheck: The AIG has node \"%p\" with a wrong ordering of fanins.\n", pObj );
+            return 0;
+        }
+        pObj2 = Aig_TableLookup( p, pObj );
+        if ( pObj2 != pObj )
+        {
+            printf( "Aig_ManCheck: Node \"%p\" is not in the structural hashing table.\n", pObj );
+            return 0;
+        }
+    }
+    // count the total number of nodes
+    if ( Aig_ManObjNum(p) != 1 + Aig_ManPiNum(p) + Aig_ManPoNum(p) + 
+        Aig_ManBufNum(p) + Aig_ManAndNum(p) + Aig_ManExorNum(p) + Aig_ManLatchNum(p) )
+    {
+        printf( "Aig_ManCheck: The number of created nodes is wrong.\n" );
+        printf( "C1 = %d. Pi = %d. Po = %d. Buf = %d. And = %d. Xor = %d. Lat = %d. Total = %d.\n",
+            1, Aig_ManPiNum(p), Aig_ManPoNum(p), Aig_ManBufNum(p), Aig_ManAndNum(p), Aig_ManExorNum(p), Aig_ManLatchNum(p), 
+            1 + Aig_ManPiNum(p) + Aig_ManPoNum(p) + Aig_ManBufNum(p) + Aig_ManAndNum(p) + Aig_ManExorNum(p) + Aig_ManLatchNum(p) );
+        printf( "Created = %d. Deleted = %d. Existing = %d.\n",
+            p->nCreated, p->nDeleted, p->nCreated - p->nDeleted );
+        return 0;
+    }
+    // count the number of nodes in the table
+    if ( Aig_TableCountEntries(p) != Aig_ManAndNum(p) + Aig_ManExorNum(p) + Aig_ManLatchNum(p) )
+    {
+        printf( "Aig_ManCheck: The number of nodes in the structural hashing table is wrong.\n" );
+        printf( "Entries = %d. And = %d. Xor = %d. Lat = %d. Total = %d.\n", 
+            Aig_TableCountEntries(p), Aig_ManAndNum(p), Aig_ManExorNum(p), Aig_ManLatchNum(p),
+            Aig_ManAndNum(p) + Aig_ManExorNum(p) + Aig_ManLatchNum(p) );
+
+        return 0;
+    }
+//    if ( !Aig_ManIsAcyclic(p) )
+//        return 0;
+    return 1; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if the markA is reset.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManCheckMarkA( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        assert( pObj->fMarkA == 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks the consistency of phase assignment.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManCheckPhase( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        if ( Aig_ObjIsPi(pObj) )
+            assert( (int)pObj->fPhase == 0 );
+        else
+            assert( (int)pObj->fPhase == (Aig_ObjPhaseReal(Aig_ObjChild0(pObj)) & Aig_ObjPhaseReal(Aig_ObjChild1(pObj))) );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigDfs.c b/abc70930/src/aig/aig/aigDfs.c
new file mode 100644
index 00000000..dedfeb4a
--- /dev/null
+++ b/abc70930/src/aig/aig/aigDfs.c
@@ -0,0 +1,700 @@
+/**CFile****************************************************************
+
+  FileName    [aigDfs.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [DFS traversal procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigDfs.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDfs_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    if ( pObj == NULL )
+        return;
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
+    Aig_ManDfs_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    Aig_ManDfs_rec( p, Aig_ObjFanin1(pObj), vNodes );
+    assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfs( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManIncrementTravId( p );
+    // mark constant and PIs
+    Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
+    Aig_ManForEachPi( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    // if there are latches, mark them
+    if ( Aig_ManLatchNum(p) > 0 )
+        Aig_ManForEachObj( p, pObj, i )
+            if ( Aig_ObjIsLatch(pObj) )
+                Aig_ObjSetTravIdCurrent( p, pObj );
+    // go through the nodes
+    vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
+    Aig_ManForEachObj( p, pObj, i )
+        if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
+            Aig_ManDfs_rec( p, pObj, vNodes );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfsNodes( Aig_Man_t * p, Aig_Obj_t ** ppNodes, int nNodes )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    assert( Aig_ManLatchNum(p) == 0 );
+    Aig_ManIncrementTravId( p );
+    // mark constant and PIs
+    Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
+    Aig_ManForEachPi( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    // go through the nodes
+    vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
+    for ( i = 0; i < nNodes; i++ )
+        Aig_ManDfs_rec( p, ppNodes[i], vNodes );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDfsChoices_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    if ( pObj == NULL )
+        return;
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    assert( Aig_ObjIsNode(pObj) );
+    Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    Aig_ManDfsChoices_rec( p, Aig_ObjFanin1(pObj), vNodes );
+    Aig_ManDfsChoices_rec( p, p->pEquivs[pObj->Id], vNodes );
+    assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfsChoices( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    assert( p->pEquivs != NULL );
+    Aig_ManIncrementTravId( p );
+    // mark constant and PIs
+    Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
+    Aig_ManForEachPi( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    // go through the nodes
+    vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the reverse DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDfsReverse_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    Aig_Obj_t * pFanout;
+    int iFanout = -1, i;
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
+    Aig_ObjForEachFanout( p, pObj, pFanout, iFanout, i )
+        Aig_ManDfsReverse_rec( p, pFanout, vNodes );
+    assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the reverse DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfsReverse( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManIncrementTravId( p );
+    // mark POs
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    // if there are latches, mark them
+    if ( Aig_ManLatchNum(p) > 0 )
+        Aig_ManForEachObj( p, pObj, i )
+            if ( Aig_ObjIsLatch(pObj) )
+                Aig_ObjSetTravIdCurrent( p, pObj );
+    // go through the nodes
+    vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
+    Aig_ManForEachObj( p, pObj, i )
+        if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
+            Aig_ManDfsReverse_rec( p, pObj, vNodes );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the max number of levels in the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManLevelNum( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, LevelsMax;
+    LevelsMax = 0;
+    Aig_ManForEachPo( p, pObj, i )
+        LevelsMax = AIG_MAX( LevelsMax, (int)Aig_ObjFanin0(pObj)->Level );
+    return LevelsMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the max number of levels in the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManCountLevels( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i, LevelsMax, Level0, Level1;
+    // initialize the levels
+    Aig_ManConst1(p)->iData = 0;
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->iData = 0;
+    // compute levels in a DFS order
+    vNodes = Aig_ManDfs( p );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        Level0 = Aig_ObjFanin0(pObj)->iData;
+        Level1 = Aig_ObjFanin1(pObj)->iData;
+        pObj->iData = 1 + Aig_ObjIsExor(pObj) + AIG_MAX(Level0, Level1);
+    }
+    Vec_PtrFree( vNodes );
+    // get levels of the POs
+    LevelsMax = 0;
+    Aig_ManForEachPo( p, pObj, i )
+        LevelsMax = AIG_MAX( LevelsMax, Aig_ObjFanin0(pObj)->iData );
+    return LevelsMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ConeMark_rec( Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
+        return;
+    Aig_ConeMark_rec( Aig_ObjFanin0(pObj) );
+    Aig_ConeMark_rec( Aig_ObjFanin1(pObj) );
+    assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ConeCleanAndMark_rec( Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
+        return;
+    Aig_ConeCleanAndMark_rec( Aig_ObjFanin0(pObj) );
+    Aig_ConeCleanAndMark_rec( Aig_ObjFanin1(pObj) );
+    assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjSetMarkA( pObj );
+    pObj->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ConeCountAndMark_rec( Aig_Obj_t * pObj )
+{
+    int Counter;
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
+        return 0;
+    Counter = 1 + Aig_ConeCountAndMark_rec( Aig_ObjFanin0(pObj) ) + 
+        Aig_ConeCountAndMark_rec( Aig_ObjFanin1(pObj) );
+    assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjSetMarkA( pObj );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ConeUnmark_rec( Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) || !Aig_ObjIsMarkA(pObj) )
+        return;
+    Aig_ConeUnmark_rec( Aig_ObjFanin0(pObj) ); 
+    Aig_ConeUnmark_rec( Aig_ObjFanin1(pObj) );
+    assert( Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjClearMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_DagSize( Aig_Obj_t * pObj )
+{
+    int Counter;
+    Counter = Aig_ConeCountAndMark_rec( Aig_Regular(pObj) );
+    Aig_ConeUnmark_rec( Aig_Regular(pObj) );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the support size of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_SupportSize_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int * pCounter )
+{
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    if ( Aig_ObjIsPi(pObj) )
+    {
+        (*pCounter)++;
+        return;
+    }
+    assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
+    Aig_SupportSize_rec( p, Aig_ObjFanin0(pObj), pCounter );
+    if ( Aig_ObjFanin1(pObj) )
+        Aig_SupportSize_rec( p, Aig_ObjFanin1(pObj), pCounter );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the support size of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_SupportSize( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    int Counter = 0;
+    assert( !Aig_IsComplement(pObj) );
+    assert( !Aig_ObjIsPo(pObj) );
+    Aig_ManIncrementTravId( p );
+    Aig_SupportSize_rec( p, pObj, &Counter );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers the AIG from one manager into another.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_Transfer_rec( Aig_Man_t * pDest, Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
+        return;
+    Aig_Transfer_rec( pDest, Aig_ObjFanin0(pObj) ); 
+    Aig_Transfer_rec( pDest, Aig_ObjFanin1(pObj) );
+    pObj->pData = Aig_And( pDest, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+    assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers the AIG from one manager into another.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Transfer( Aig_Man_t * pSour, Aig_Man_t * pDest, Aig_Obj_t * pRoot, int nVars )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    // solve simple cases
+    if ( pSour == pDest )
+        return pRoot;
+    if ( Aig_ObjIsConst1( Aig_Regular(pRoot) ) )
+        return Aig_NotCond( Aig_ManConst1(pDest), Aig_IsComplement(pRoot) );
+    // set the PI mapping
+    Aig_ManForEachPi( pSour, pObj, i )
+    {
+        if ( i == nVars )
+           break;
+        pObj->pData = Aig_IthVar(pDest, i);
+    }
+    // transfer and set markings
+    Aig_Transfer_rec( pDest, Aig_Regular(pRoot) );
+    // clear the markings
+    Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
+    return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_Compose_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFunc, Aig_Obj_t * pVar )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsMarkA(pObj) )
+        return;
+    if ( Aig_ObjIsConst1(pObj) || Aig_ObjIsPi(pObj) )
+    {
+        pObj->pData = pObj == pVar ? pFunc : pObj;
+        return;
+    }
+    Aig_Compose_rec( p, Aig_ObjFanin0(pObj), pFunc, pVar ); 
+    Aig_Compose_rec( p, Aig_ObjFanin1(pObj), pFunc, pVar );
+    pObj->pData = Aig_And( p, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+    assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
+    Aig_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Compose( Aig_Man_t * p, Aig_Obj_t * pRoot, Aig_Obj_t * pFunc, int iVar )
+{
+    // quit if the PI variable is not defined
+    if ( iVar >= Aig_ManPiNum(p) )
+    {
+        printf( "Aig_Compose(): The PI variable %d is not defined.\n", iVar );
+        return NULL;
+    }
+    // recursively perform composition
+    Aig_Compose_rec( p, Aig_Regular(pRoot), pFunc, Aig_ManPi(p, iVar) );
+    // clear the markings
+    Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
+    return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the internal nodes of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCollectCut_rec( Aig_Obj_t * pNode, Vec_Ptr_t * vNodes )
+{
+//    Aig_Obj_t * pFan0 = Aig_ObjFanin0(pNode);
+//    Aig_Obj_t * pFan1 = Aig_ObjFanin1(pNode);
+    if ( pNode->fMarkA )
+        return;
+    pNode->fMarkA = 1;
+    assert( Aig_ObjIsNode(pNode) );
+    Aig_ObjCollectCut_rec( Aig_ObjFanin0(pNode), vNodes );
+    Aig_ObjCollectCut_rec( Aig_ObjFanin1(pNode), vNodes );
+    Vec_PtrPush( vNodes, pNode );
+//printf( "added %d  ", pNode->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the internal nodes of the cut.]
+
+  Description [Does not include the leaves of the cut.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCollectCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    // collect and mark the leaves
+    Vec_PtrClear( vNodes );
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+    {
+        assert( pObj->fMarkA == 0 );
+        pObj->fMarkA = 1;
+//        printf( "%d " , pObj->Id );
+    }
+//printf( "\n" );
+    // collect and mark the nodes
+    Aig_ObjCollectCut_rec( pRoot, vNodes );
+    // clean the nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        pObj->fMarkA = 0;
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+        pObj->fMarkA = 0;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjCollectSuper_rec( Aig_Obj_t * pRoot, Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    int RetValue1, RetValue2, i;
+    // check if the node is visited
+    if ( Aig_Regular(pObj)->fMarkA )
+    {
+        // check if the node occurs in the same polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == pObj )
+                return 1;
+        // check if the node is present in the opposite polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == Aig_Not(pObj) )
+                return -1;
+        assert( 0 );
+        return 0;
+    }
+    // if the new node is complemented or a PI, another gate begins
+    if ( pObj != pRoot && (Aig_IsComplement(pObj) || Aig_ObjType(pObj) != Aig_ObjType(pRoot) || Aig_ObjRefs(pObj) > 1) )
+    {
+        Vec_PtrPush( vSuper, pObj );
+        Aig_Regular(pObj)->fMarkA = 1;
+        return 0;
+    }
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsNode(pObj) );
+    // go through the branches
+    RetValue1 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild0(pObj) ), vSuper );
+    RetValue2 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild1(pObj) ), vSuper );
+    if ( RetValue1 == -1 || RetValue2 == -1 )
+        return -1;
+    // return 1 if at least one branch has a duplicate
+    return RetValue1 || RetValue2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjCollectSuper( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    int RetValue, i;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsNode(pObj) );
+    // collect the nodes in the implication supergate
+    Vec_PtrClear( vSuper );
+    RetValue = Aig_ObjCollectSuper_rec( pObj, pObj, vSuper );
+    assert( Vec_PtrSize(vSuper) > 1 );
+    // unmark the visited nodes
+    Vec_PtrForEachEntry( vSuper, pObj, i )
+        Aig_Regular(pObj)->fMarkA = 0;
+    // if we found the node and its complement in the same implication supergate, 
+    // return empty set of nodes (meaning that we should use constant-0 node)
+    if ( RetValue == -1 )
+        vSuper->nSize = 0;
+    return RetValue;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigFanout.c b/abc70930/src/aig/aig/aigFanout.c
new file mode 100644
index 00000000..d0beb128
--- /dev/null
+++ b/abc70930/src/aig/aig/aigFanout.c
@@ -0,0 +1,189 @@
+/**CFile****************************************************************
+
+  FileName    [aigFanout.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Fanout manipulation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigFanout.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+// 0: first iFan
+// 1: prev iFan0
+// 2: prev iFan1
+// 3: next iFan0
+// 4: next iFan1
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline int   Aig_FanoutCreate( int FanId, int Num )    { assert( Num < 2 ); return (FanId << 1) | Num;   } 
+static inline int * Aig_FanoutObj( int * pData, int ObjId )   { return pData + 5*ObjId;                         }
+static inline int * Aig_FanoutPrev( int * pData, int iFan )   { return pData + 5*(iFan >> 1) + 1 + (iFan & 1);  }
+static inline int * Aig_FanoutNext( int * pData, int iFan )   { return pData + 5*(iFan >> 1) + 3 + (iFan & 1);  }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Create fanout for all objects in the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManFanoutStart( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    assert( Aig_ManBufNum(p) == 0 );
+    // allocate fanout datastructure
+    assert( p->pFanData == NULL );
+    p->nFansAlloc = 2 * Aig_ManObjNumMax(p);
+    if ( p->nFansAlloc < (1<<12) )
+        p->nFansAlloc = (1<<12);
+    p->pFanData = ALLOC( int, 5 * p->nFansAlloc );
+    memset( p->pFanData, 0, sizeof(int) * 5 * p->nFansAlloc );
+    // add fanouts for all objects
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( Aig_ObjChild0(pObj) )
+            Aig_ObjAddFanout( p, Aig_ObjFanin0(pObj), pObj );
+        if ( Aig_ObjChild1(pObj) )
+            Aig_ObjAddFanout( p, Aig_ObjFanin1(pObj), pObj );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes fanout for all objects in the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManFanoutStop( Aig_Man_t * p )
+{
+    assert( p->pFanData != NULL );
+    FREE( p->pFanData );
+    p->nFansAlloc = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds fanout (pFanout) of node (pObj).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjAddFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout )
+{
+    int iFan, * pFirst, * pPrevC, * pNextC, * pPrev, * pNext;
+    assert( p->pFanData );
+    assert( !Aig_IsComplement(pObj) && !Aig_IsComplement(pFanout) );
+    assert( pFanout->Id > 0 );
+    if ( pObj->Id >= p->nFansAlloc || pFanout->Id >= p->nFansAlloc )
+    {
+        int nFansAlloc = 2 * AIG_MAX( pObj->Id, pFanout->Id ); 
+        p->pFanData = REALLOC( int, p->pFanData, 5 * nFansAlloc );
+        memset( p->pFanData + 5 * p->nFansAlloc, 0, sizeof(int) * 5 * (nFansAlloc - p->nFansAlloc) );
+        p->nFansAlloc = nFansAlloc;
+    }
+    assert( pObj->Id < p->nFansAlloc && pFanout->Id < p->nFansAlloc );
+    iFan   = Aig_FanoutCreate( pFanout->Id, Aig_ObjWhatFanin(pFanout, pObj) );
+    pPrevC = Aig_FanoutPrev( p->pFanData, iFan );
+    pNextC = Aig_FanoutNext( p->pFanData, iFan );
+    pFirst = Aig_FanoutObj( p->pFanData, pObj->Id );
+    if ( *pFirst == 0 )
+    {
+        *pFirst = iFan;
+        *pPrevC = iFan;
+        *pNextC = iFan;
+    }
+    else
+    {
+        pPrev = Aig_FanoutPrev( p->pFanData, *pFirst );
+        pNext = Aig_FanoutNext( p->pFanData, *pPrev );
+        assert( *pNext == *pFirst );
+        *pPrevC = *pPrev;
+        *pNextC = *pFirst;
+        *pPrev  = iFan;
+        *pNext  = iFan;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes fanout (pFanout) of node (pObj).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjRemoveFanout( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFanout )
+{
+    int iFan, * pFirst, * pPrevC, * pNextC, * pPrev, * pNext;
+    assert( p->pFanData && pObj->Id < p->nFansAlloc && pFanout->Id < p->nFansAlloc );
+    assert( !Aig_IsComplement(pObj) && !Aig_IsComplement(pFanout) );
+    assert( pFanout->Id > 0 );
+    iFan   = Aig_FanoutCreate( pFanout->Id, Aig_ObjWhatFanin(pFanout, pObj) );
+    pPrevC = Aig_FanoutPrev( p->pFanData, iFan );
+    pNextC = Aig_FanoutNext( p->pFanData, iFan );
+    pPrev  = Aig_FanoutPrev( p->pFanData, *pNextC );
+    pNext  = Aig_FanoutNext( p->pFanData, *pPrevC );
+    assert( *pPrev == iFan );
+    assert( *pNext == iFan );
+    pFirst = Aig_FanoutObj( p->pFanData, pObj->Id );
+    assert( *pFirst > 0 );
+    if ( *pFirst == iFan )
+    {
+        if ( *pNextC == iFan )
+        {
+            *pFirst = 0;
+            *pPrev  = 0;
+            *pNext  = 0;
+            *pPrevC = 0;
+            *pNextC = 0;
+            return;
+        }
+        *pFirst = *pNextC;
+    }
+    *pPrev  = *pPrevC;
+    *pNext  = *pNextC;
+    *pPrevC = 0;
+    *pNextC = 0;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigMan.c b/abc70930/src/aig/aig/aigMan.c
new file mode 100644
index 00000000..fed6aebd
--- /dev/null
+++ b/abc70930/src/aig/aig/aigMan.c
@@ -0,0 +1,325 @@
+/**CFile****************************************************************
+
+  FileName    [aigMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [AIG manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigMan.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the AIG manager.]
+
+  Description [The argument of this procedure is a soft limit on the
+  the number of nodes, or 0 if the limit is unknown.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManStart( int nNodesMax )
+{
+    Aig_Man_t * p;
+    if ( nNodesMax <= 0 )
+        nNodesMax = 10007;
+    // start the manager
+    p = ALLOC( Aig_Man_t, 1 );
+    memset( p, 0, sizeof(Aig_Man_t) );
+    // perform initializations
+    p->nTravIds = 1;
+    p->fCatchExor = 0;
+    // allocate arrays for nodes
+    p->vPis  = Vec_PtrAlloc( 100 );
+    p->vPos  = Vec_PtrAlloc( 100 );
+    p->vObjs = Vec_PtrAlloc( 1000 );
+    p->vBufs = Vec_PtrAlloc( 100 );
+    // prepare the internal memory manager
+    p->pMemObjs = Aig_MmFixedStart( sizeof(Aig_Obj_t), nNodesMax );
+    // create the constant node
+    p->pConst1 = Aig_ManFetchMemory( p );
+    p->pConst1->Type = AIG_OBJ_CONST1;
+    p->pConst1->fPhase = 1;
+    p->nObjs[AIG_OBJ_CONST1]++;
+    // start the table
+    p->nTableSize = Aig_PrimeCudd( nNodesMax );
+    p->pTable = ALLOC( Aig_Obj_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Aig_Obj_t *) * p->nTableSize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManStartFrom( Aig_Man_t * p )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj;
+    int i;
+    // create the new manager
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    // create the PIs
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager recursively.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ManDup_rec( Aig_Man_t * pNew, Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    if ( pObj->pData )
+        return pObj->pData;
+    Aig_ManDup_rec( pNew, p, Aig_ObjFanin0(pObj) );
+    if ( Aig_ObjIsBuf(pObj) )
+        return pObj->pData = Aig_ObjChild0Copy(pObj);
+    Aig_ManDup_rec( pNew, p, Aig_ObjFanin1(pObj) );
+    return pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManDup( Aig_Man_t * p, int fOrdered )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj;
+    int i;
+    // create the new manager
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    pNew->nRegs = p->nRegs;
+    pNew->nAsserts = p->nAsserts;
+    if ( p->vFlopNums )
+        pNew->vFlopNums = Vec_IntDup( p->vFlopNums );
+    // create the PIs
+    Aig_ManCleanData( p );
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    // duplicate internal nodes
+    if ( fOrdered )
+    {
+        Aig_ManForEachObj( p, pObj, i )
+            if ( Aig_ObjIsBuf(pObj) )
+                pObj->pData = Aig_ObjChild0Copy(pObj);
+            else if ( Aig_ObjIsNode(pObj) )
+                pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+    }
+    else
+    {
+        Aig_ManForEachObj( p, pObj, i )
+            if ( !Aig_ObjIsPo(pObj) )
+            {
+                Aig_ManDup_rec( pNew, p, pObj );        
+                assert( pObj->Level == ((Aig_Obj_t*)pObj->pData)->Level );
+            }
+    }
+    // add the POs
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(pObj) );
+    assert( Aig_ManBufNum(p) != 0 || Aig_ManNodeNum(p) == Aig_ManNodeNum(pNew) );
+    // check the resulting network
+    if ( !Aig_ManCheck(pNew) )
+        printf( "Aig_ManDup(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Extracts the miter composed of XOR of the two nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManExtractMiter( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj;
+    int i;
+    // create the new manager
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    // create the PIs
+    Aig_ManCleanData( p );
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    // dump the nodes
+    Aig_ManDup_rec( pNew, p, pNode1 );   
+    Aig_ManDup_rec( pNew, p, pNode2 );   
+    // construct the EXOR
+    pObj = Aig_Exor( pNew, pNode1->pData, pNode2->pData ); 
+    pObj = Aig_NotCond( pObj, Aig_Regular(pObj)->fPhase ^ Aig_IsComplement(pObj) );
+    // add the PO
+    Aig_ObjCreatePo( pNew, pObj );
+    // check the resulting network
+    if ( !Aig_ManCheck(pNew) )
+        printf( "Aig_ManDup(): The check has failed.\n" );
+    return pNew;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManStop( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    if ( p->vMapped )
+        Vec_PtrFree( p->vMapped );
+    // print time
+    if ( p->time1 ) { PRT( "time1", p->time1 ); }
+    if ( p->time2 ) { PRT( "time2", p->time2 ); }
+    // delete timing
+    if ( p->pManTime )
+        Aig_TManStop( p->pManTime );
+    // delete fanout
+    if ( p->pFanData ) 
+        Aig_ManFanoutStop( p );
+    // make sure the nodes have clean marks
+    Aig_ManForEachObj( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+//    Aig_TableProfile( p );
+    Aig_MmFixedStop( p->pMemObjs, 0 );
+    if ( p->vPis )     Vec_PtrFree( p->vPis );
+    if ( p->vPos )     Vec_PtrFree( p->vPos );
+    if ( p->vObjs )    Vec_PtrFree( p->vObjs );
+    if ( p->vBufs )    Vec_PtrFree( p->vBufs );
+    if ( p->vLevelR )  Vec_IntFree( p->vLevelR );
+    if ( p->vLevels )  Vec_VecFree( p->vLevels );
+    if ( p->vFlopNums) Vec_IntFree( p->vFlopNums );
+    FREE( p->pName );
+    FREE( p->pObjCopies );
+    FREE( p->pReprs );
+    FREE( p->pEquivs );
+    free( p->pTable );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManCleanup( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vObjs;
+    Aig_Obj_t * pNode;
+    int i, nNodesOld;
+    nNodesOld = Aig_ManNodeNum(p);
+    // collect roots of dangling nodes
+    vObjs = Vec_PtrAlloc( 100 );
+    Aig_ManForEachObj( p, pNode, i )
+        if ( Aig_ObjIsNode(pNode) && Aig_ObjRefs(pNode) == 0 )
+            Vec_PtrPush( vObjs, pNode );
+    // recursively remove dangling nodes
+    Vec_PtrForEachEntry( vObjs, pNode, i )
+        Aig_ObjDelete_rec( p, pNode, 1 );
+    Vec_PtrFree( vObjs );
+    return nNodesOld - Aig_ManNodeNum(p);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManPrintStats( Aig_Man_t * p )
+{
+    printf( "PI/PO/Lat = %5d/%5d/%5d   ", Aig_ManPiNum(p), Aig_ManPoNum(p), Aig_ManLatchNum(p) );
+    printf( "A = %7d. ",    Aig_ManAndNum(p) );
+    if ( Aig_ManExorNum(p) )
+        printf( "X = %5d. ",    Aig_ManExorNum(p) );
+//    if ( Aig_ManBufNum(p) )
+        printf( "B = %5d. ",    Aig_ManBufNum(p) );
+//    printf( "Cre = %6d. ",  p->nCreated );
+//    printf( "Del = %6d. ",  p->nDeleted );
+//    printf( "Lev = %3d. ",  Aig_ManCountLevels(p) );
+    printf( "Max = %7d. ",  Aig_ManObjNumMax(p) );
+    printf( "Lev = %3d. ",  Aig_ManLevels(p) );
+    if ( Aig_ManRegNum(p) )
+        printf( "Lat = %5d. ", Aig_ManRegNum(p) );
+    printf( "\n" );
+    fflush( stdout );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigMem.c b/abc70930/src/aig/aig/aigMem.c
new file mode 100644
index 00000000..dab90777
--- /dev/null
+++ b/abc70930/src/aig/aig/aigMem.c
@@ -0,0 +1,598 @@
+/**CFile****************************************************************
+
+  FileName    [aigMem.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Memory managers.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigMem.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+struct Aig_MmFixed_t_
+{
+    // information about individual entries
+    int           nEntrySize;    // the size of one entry
+    int           nEntriesAlloc; // the total number of entries allocated
+    int           nEntriesUsed;  // the number of entries in use
+    int           nEntriesMax;   // the max number of entries in use
+    char *        pEntriesFree;  // the linked list of free entries
+
+    // this is where the memory is stored
+    int           nChunkSize;    // the size of one chunk
+    int           nChunksAlloc;  // the maximum number of memory chunks 
+    int           nChunks;       // the current number of memory chunks 
+    char **       pChunks;       // the allocated memory
+
+    // statistics
+    int           nMemoryUsed;   // memory used in the allocated entries
+    int           nMemoryAlloc;  // memory allocated
+};
+
+struct Aig_MmFlex_t_
+{
+    // information about individual entries
+    int           nEntriesUsed;  // the number of entries allocated
+    char *        pCurrent;      // the current pointer to free memory
+    char *        pEnd;          // the first entry outside the free memory
+
+    // this is where the memory is stored
+    int           nChunkSize;    // the size of one chunk
+    int           nChunksAlloc;  // the maximum number of memory chunks 
+    int           nChunks;       // the current number of memory chunks 
+    char **       pChunks;       // the allocated memory
+
+    // statistics
+    int           nMemoryUsed;   // memory used in the allocated entries
+    int           nMemoryAlloc;  // memory allocated
+};
+
+struct Aig_MmStep_t_
+{
+    int             nMems;    // the number of fixed memory managers employed
+    Aig_MmFixed_t **  pMems;    // memory managers: 2^1 words, 2^2 words, etc
+    int             nMapSize; // the size of the memory array
+    Aig_MmFixed_t **  pMap;     // maps the number of bytes into its memory manager
+};
+
+#define ALLOC(type, num)     ((type *) malloc(sizeof(type) * (num)))
+#define FREE(obj)             ((obj) ? (free((char *) (obj)), (obj) = 0) : 0)
+#define REALLOC(type, obj, num)    \
+        ((obj) ? ((type *) realloc((char *)(obj), sizeof(type) * (num))) : \
+         ((type *) malloc(sizeof(type) * (num))))
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates memory pieces of fixed size.]
+
+  Description [The size of the chunk is computed as the minimum of
+  1024 entries and 64K. Can only work with entry size at least 4 byte long.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_MmFixed_t * Aig_MmFixedStart( int nEntrySize, int nEntriesMax )
+{
+    Aig_MmFixed_t * p;
+
+    p = ALLOC( Aig_MmFixed_t, 1 );
+    memset( p, 0, sizeof(Aig_MmFixed_t) );
+
+    p->nEntrySize    = nEntrySize;
+    p->nEntriesAlloc = 0;
+    p->nEntriesUsed  = 0;
+    p->pEntriesFree  = NULL;
+
+    p->nChunkSize = nEntriesMax / 8;
+    if ( p->nChunkSize < 8 )
+        p->nChunkSize = 8;
+
+    p->nChunksAlloc  = 64;
+    p->nChunks       = 0;
+    p->pChunks       = ALLOC( char *, p->nChunksAlloc );
+
+    p->nMemoryUsed   = 0;
+    p->nMemoryAlloc  = 0;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmFixedStop( Aig_MmFixed_t * p, int fVerbose )
+{
+    int i;
+    if ( p == NULL )
+        return;
+    if ( fVerbose )
+    {
+        printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n",
+            p->nEntrySize, p->nChunkSize, p->nChunks );
+        printf( "   Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n",
+            p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc );
+    }
+    for ( i = 0; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    free( p->pChunks );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Aig_MmFixedEntryFetch( Aig_MmFixed_t * p )
+{
+    char * pTemp;
+    int i;
+
+    // check if there are still free entries
+    if ( p->nEntriesUsed == p->nEntriesAlloc )
+    { // need to allocate more entries
+        assert( p->pEntriesFree == NULL );
+        if ( p->nChunks == p->nChunksAlloc )
+        {
+            p->nChunksAlloc *= 2;
+            p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); 
+        }
+        p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize );
+        p->nMemoryAlloc += p->nEntrySize * p->nChunkSize;
+        // transform these entries into a linked list
+        pTemp = p->pEntriesFree;
+        for ( i = 1; i < p->nChunkSize; i++ )
+        {
+            *((char **)pTemp) = pTemp + p->nEntrySize;
+            pTemp += p->nEntrySize;
+        }
+        // set the last link
+        *((char **)pTemp) = NULL;
+        // add the chunk to the chunk storage
+        p->pChunks[ p->nChunks++ ] = p->pEntriesFree;
+        // add to the number of entries allocated
+        p->nEntriesAlloc += p->nChunkSize;
+    }
+    // incrememt the counter of used entries
+    p->nEntriesUsed++;
+    if ( p->nEntriesMax < p->nEntriesUsed )
+        p->nEntriesMax = p->nEntriesUsed;
+    // return the first entry in the free entry list
+    pTemp = p->pEntriesFree;
+    p->pEntriesFree = *((char **)pTemp);
+    return pTemp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmFixedEntryRecycle( Aig_MmFixed_t * p, char * pEntry )
+{
+    // decrement the counter of used entries
+    p->nEntriesUsed--;
+    // add the entry to the linked list of free entries
+    *((char **)pEntry) = p->pEntriesFree;
+    p->pEntriesFree = pEntry;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description [Relocates all the memory except the first chunk.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmFixedRestart( Aig_MmFixed_t * p )
+{
+    int i;
+    char * pTemp;
+    if ( p->nChunks == 0 )
+        return;
+    // deallocate all chunks except the first one
+    for ( i = 1; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    p->nChunks = 1;
+    // transform these entries into a linked list
+    pTemp = p->pChunks[0];
+    for ( i = 1; i < p->nChunkSize; i++ )
+    {
+        *((char **)pTemp) = pTemp + p->nEntrySize;
+        pTemp += p->nEntrySize;
+    }
+    // set the last link
+    *((char **)pTemp) = NULL;
+    // set the free entry list
+    p->pEntriesFree  = p->pChunks[0];
+    // set the correct statistics
+    p->nMemoryAlloc  = p->nEntrySize * p->nChunkSize;
+    p->nMemoryUsed   = 0;
+    p->nEntriesAlloc = p->nChunkSize;
+    p->nEntriesUsed  = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_MmFixedReadMemUsage( Aig_MmFixed_t * p )
+{
+    return p->nMemoryAlloc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_MmFixedReadMaxEntriesUsed( Aig_MmFixed_t * p )
+{
+    return p->nEntriesMax;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates entries of flexible size.]
+
+  Description [Can only work with entry size at least 4 byte long.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_MmFlex_t * Aig_MmFlexStart()
+{
+    Aig_MmFlex_t * p;
+
+    p = ALLOC( Aig_MmFlex_t, 1 );
+    memset( p, 0, sizeof(Aig_MmFlex_t) );
+
+    p->nEntriesUsed  = 0;
+    p->pCurrent      = NULL;
+    p->pEnd          = NULL;
+
+    p->nChunkSize    = (1 << 18);
+    p->nChunksAlloc  = 64;
+    p->nChunks       = 0;
+    p->pChunks       = ALLOC( char *, p->nChunksAlloc );
+
+    p->nMemoryUsed   = 0;
+    p->nMemoryAlloc  = 0;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmFlexStop( Aig_MmFlex_t * p, int fVerbose )
+{
+    int i;
+    if ( p == NULL )
+        return;
+    if ( fVerbose )
+    {
+        printf( "Flexible memory manager: Chunk size = %d. Chunks used = %d.\n",
+            p->nChunkSize, p->nChunks );
+        printf( "   Entries used = %d. Memory used = %d. Memory alloc = %d.\n",
+            p->nEntriesUsed, p->nMemoryUsed, p->nMemoryAlloc );
+    }
+    for ( i = 0; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    free( p->pChunks );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Aig_MmFlexEntryFetch( Aig_MmFlex_t * p, int nBytes )
+{
+    char * pTemp;
+    // check if there are still free entries
+    if ( p->pCurrent == NULL || p->pCurrent + nBytes > p->pEnd )
+    { // need to allocate more entries
+        if ( p->nChunks == p->nChunksAlloc )
+        {
+            p->nChunksAlloc *= 2;
+            p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); 
+        }
+        if ( nBytes > p->nChunkSize )
+        {
+            // resize the chunk size if more memory is requested than it can give
+            // (ideally, this should never happen)
+            p->nChunkSize = 2 * nBytes;
+        }
+        p->pCurrent = ALLOC( char, p->nChunkSize );
+        p->pEnd     = p->pCurrent + p->nChunkSize;
+        p->nMemoryAlloc += p->nChunkSize;
+        // add the chunk to the chunk storage
+        p->pChunks[ p->nChunks++ ] = p->pCurrent;
+    }
+    assert( p->pCurrent + nBytes <= p->pEnd );
+    // increment the counter of used entries
+    p->nEntriesUsed++;
+    // keep track of the memory used
+    p->nMemoryUsed += nBytes;
+    // return the next entry
+    pTemp = p->pCurrent;
+    p->pCurrent += nBytes;
+    return pTemp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description [Relocates all the memory except the first chunk.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmFlexRestart( Aig_MmFlex_t * p )
+{
+    int i;
+    if ( p->nChunks == 0 )
+        return;
+    // deallocate all chunks except the first one
+    for ( i = 1; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    p->nChunks  = 1;
+    p->nMemoryAlloc = p->nChunkSize;
+    // transform these entries into a linked list
+    p->pCurrent = p->pChunks[0];
+    p->pEnd     = p->pCurrent + p->nChunkSize;
+    p->nEntriesUsed = 0;
+    p->nMemoryUsed = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_MmFlexReadMemUsage( Aig_MmFlex_t * p )
+{
+    return p->nMemoryUsed;
+}
+
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the hierarchical memory manager.]
+
+  Description [This manager can allocate entries of any size.
+  Iternally they are mapped into the entries with the number of bytes
+  equal to the power of 2. The smallest entry size is 8 bytes. The
+  next one is 16 bytes etc. So, if the user requests 6 bytes, he gets 
+  8 byte entry. If we asks for 25 bytes, he gets 32 byte entry etc.
+  The input parameters "nSteps" says how many fixed memory managers
+  are employed internally. Calling this procedure with nSteps equal
+  to 10 results in 10 hierarchically arranged internal memory managers, 
+  which can allocate up to 4096 (1Kb) entries. Requests for larger 
+  entries are handed over to malloc() and then free()ed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_MmStep_t * Aig_MmStepStart( int nSteps )
+{
+    Aig_MmStep_t * p;
+    int i, k;
+    p = ALLOC( Aig_MmStep_t, 1 );
+    memset( p, 0, sizeof(Aig_MmStep_t) );
+    p->nMems = nSteps;
+    // start the fixed memory managers
+    p->pMems = ALLOC( Aig_MmFixed_t *, p->nMems );
+    for ( i = 0; i < p->nMems; i++ )
+        p->pMems[i] = Aig_MmFixedStart( (8<<i), (1<<13) );
+    // set up the mapping of the required memory size into the corresponding manager
+    p->nMapSize = (4<<p->nMems);
+    p->pMap = ALLOC( Aig_MmFixed_t *, p->nMapSize+1 );
+    p->pMap[0] = NULL;
+    for ( k = 1; k <= 4; k++ )
+        p->pMap[k] = p->pMems[0];
+    for ( i = 0; i < p->nMems; i++ )
+        for ( k = (4<<i)+1; k <= (8<<i); k++ )
+            p->pMap[k] = p->pMems[i];
+//for ( i = 1; i < 100; i ++ )
+//printf( "%10d: size = %10d\n", i, p->pMap[i]->nEntrySize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmStepStop( Aig_MmStep_t * p, int fVerbose )
+{
+    int i;
+    for ( i = 0; i < p->nMems; i++ )
+        Aig_MmFixedStop( p->pMems[i], fVerbose );
+//    if ( p->pLargeChunks ) 
+//    {
+//      for ( i = 0; i < p->nLargeChunks; i++ )
+//          free( p->pLargeChunks[i] );
+//      free( p->pLargeChunks );
+//    }
+    free( p->pMems );
+    free( p->pMap );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the entry.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Aig_MmStepEntryFetch( Aig_MmStep_t * p, int nBytes )
+{
+    if ( nBytes == 0 )
+        return NULL;
+    if ( nBytes > p->nMapSize )
+    {
+//        printf( "Allocating %d bytes.\n", nBytes );
+/*
+        if ( p->nLargeChunks == p->nLargeChunksAlloc )
+        {
+            if ( p->nLargeChunksAlloc == 0 )
+                p->nLargeChunksAlloc = 5;
+            p->nLargeChunksAlloc *= 2;
+            p->pLargeChunks = REALLOC( char *, p->pLargeChunks, p->nLargeChunksAlloc ); 
+        }
+        p->pLargeChunks[ p->nLargeChunks++ ] = ALLOC( char, nBytes );
+        return p->pLargeChunks[ p->nLargeChunks - 1 ];
+*/
+        return ALLOC( char, nBytes );
+    }
+    return Aig_MmFixedEntryFetch( p->pMap[nBytes] );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Recycles the entry.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_MmStepEntryRecycle( Aig_MmStep_t * p, char * pEntry, int nBytes )
+{
+    if ( nBytes == 0 )
+        return;
+    if ( nBytes > p->nMapSize )
+    {
+        free( pEntry );
+        return;
+    }
+    Aig_MmFixedEntryRecycle( p->pMap[nBytes], pEntry );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_MmStepReadMemUsage( Aig_MmStep_t * p )
+{
+    int i, nMemTotal = 0;
+    for ( i = 0; i < p->nMems; i++ )
+        nMemTotal += p->pMems[i]->nMemoryAlloc;
+    return nMemTotal;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
diff --git a/abc70930/src/aig/aig/aigMffc.c b/abc70930/src/aig/aig/aigMffc.c
new file mode 100644
index 00000000..47ce896d
--- /dev/null
+++ b/abc70930/src/aig/aig/aigMffc.c
@@ -0,0 +1,297 @@
+/**CFile****************************************************************
+
+  FileName    [aigMffc.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Computation of MFFCs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigMffc.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Dereferences the node's MFFC.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeDeref_rec( Aig_Obj_t * pNode, unsigned LevelMin )
+{
+    Aig_Obj_t * pFanin;
+    int Counter = 0;
+    if ( Aig_ObjIsPi(pNode) )
+        return 0;
+    // consider the first fanin
+    pFanin = Aig_ObjFanin0(pNode);
+    assert( pFanin->nRefs > 0 );
+    if ( --pFanin->nRefs == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeDeref_rec( pFanin, LevelMin );
+    // skip the buffer
+    if ( Aig_ObjIsBuf(pNode) )
+        return Counter;
+    assert( Aig_ObjIsNode(pNode) );
+    // consider the second fanin
+    pFanin = Aig_ObjFanin1(pNode);
+    assert( pFanin->nRefs > 0 );
+    if ( --pFanin->nRefs == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeDeref_rec( pFanin, LevelMin );
+    return Counter + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [References the node's MFFC.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeRef_rec( Aig_Obj_t * pNode, unsigned LevelMin )
+{
+    Aig_Obj_t * pFanin;
+    int Counter = 0;
+    if ( Aig_ObjIsPi(pNode) )
+        return 0;
+    // consider the first fanin
+    pFanin = Aig_ObjFanin0(pNode);
+    if ( pFanin->nRefs++ == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeRef_rec( pFanin, LevelMin );
+    // skip the buffer
+    if ( Aig_ObjIsBuf(pNode) )
+        return Counter;
+    assert( Aig_ObjIsNode(pNode) );
+    // consider the second fanin
+    pFanin = Aig_ObjFanin1(pNode);
+    if ( pFanin->nRefs++ == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeRef_rec( pFanin, LevelMin );
+    return Counter + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [References the node's MFFC.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeRefLabel_rec( Aig_Man_t * p, Aig_Obj_t * pNode, unsigned LevelMin )
+{
+    Aig_Obj_t * pFanin;
+    int Counter = 0;
+    if ( Aig_ObjIsPi(pNode) )
+        return 0;
+    Aig_ObjSetTravIdCurrent( p, pNode );
+    // consider the first fanin
+    pFanin = Aig_ObjFanin0(pNode);
+    if ( pFanin->nRefs++ == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeRefLabel_rec( p, pFanin, LevelMin );
+    if ( Aig_ObjIsBuf(pNode) )
+        return Counter;
+    assert( Aig_ObjIsNode(pNode) );
+    // consider the second fanin
+    pFanin = Aig_ObjFanin1(pNode);
+    if ( pFanin->nRefs++ == 0 && (!LevelMin || pFanin->Level > LevelMin) )
+        Counter += Aig_NodeRefLabel_rec( p, pFanin, LevelMin );
+    return Counter + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the internal and boundary nodes in the derefed MFFC.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_NodeMffsSupp_rec( Aig_Man_t * p, Aig_Obj_t * pNode, unsigned LevelMin, Vec_Ptr_t * vSupp, int fTopmost, Aig_Obj_t * pObjSkip )
+{
+    // skip visited nodes
+    if ( Aig_ObjIsTravIdCurrent(p, pNode) )
+        return;
+    Aig_ObjSetTravIdCurrent(p, pNode);
+    // add to the new support nodes
+    if ( !fTopmost && pNode != pObjSkip && (Aig_ObjIsPi(pNode) || pNode->nRefs > 0 || pNode->Level <= LevelMin) )
+    {
+        if ( vSupp ) Vec_PtrPush( vSupp, pNode );
+        return;
+    }
+    assert( Aig_ObjIsNode(pNode) );
+    // recur on the children
+    Aig_NodeMffsSupp_rec( p, Aig_ObjFanin0(pNode), LevelMin, vSupp, 0, pObjSkip );
+    Aig_NodeMffsSupp_rec( p, Aig_ObjFanin1(pNode), LevelMin, vSupp, 0, pObjSkip );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the support of depth-limited MFFC.]
+
+  Description [Returns the number of internal nodes in the MFFC.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeMffsSupp( Aig_Man_t * p, Aig_Obj_t * pNode, int LevelMin, Vec_Ptr_t * vSupp )
+{
+    int ConeSize1, ConeSize2;
+    assert( !Aig_IsComplement(pNode) );
+    assert( Aig_ObjIsNode(pNode) );
+    if ( vSupp ) Vec_PtrClear( vSupp );
+    Aig_ManIncrementTravId( p );
+    ConeSize1 = Aig_NodeDeref_rec( pNode, LevelMin );
+    Aig_NodeMffsSupp_rec( p, pNode, LevelMin, vSupp, 1, NULL );
+    ConeSize2 = Aig_NodeRef_rec( pNode, LevelMin );
+    assert( ConeSize1 == ConeSize2 );
+    assert( ConeSize1 > 0 );
+    return ConeSize1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Labels the nodes in the MFFC.]
+
+  Description [Returns the number of internal nodes in the MFFC.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeMffsLabel( Aig_Man_t * p, Aig_Obj_t * pNode )
+{
+    int ConeSize1, ConeSize2;
+    assert( !Aig_IsComplement(pNode) );
+    assert( Aig_ObjIsNode(pNode) );
+    Aig_ManIncrementTravId( p );
+    ConeSize1 = Aig_NodeDeref_rec( pNode, 0 );
+    ConeSize2 = Aig_NodeRefLabel_rec( p, pNode, 0 );
+    assert( ConeSize1 == ConeSize2 );
+    assert( ConeSize1 > 0 );
+    return ConeSize1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Labels the nodes in the MFFC.]
+
+  Description [Returns the number of internal nodes in the MFFC.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeMffsLabelCut( Aig_Man_t * p, Aig_Obj_t * pNode, Vec_Ptr_t * vLeaves )
+{
+    Aig_Obj_t * pObj;
+    int i, ConeSize1, ConeSize2;
+    assert( !Aig_IsComplement(pNode) );
+    assert( Aig_ObjIsNode(pNode) );
+    Aig_ManIncrementTravId( p );
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+        pObj->nRefs++;
+    ConeSize1 = Aig_NodeDeref_rec( pNode, 0 );
+    ConeSize2 = Aig_NodeRefLabel_rec( p, pNode, 0 );
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+        pObj->nRefs--;
+    assert( ConeSize1 == ConeSize2 );
+    assert( ConeSize1 > 0 );
+    return ConeSize1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the cut by adding the most closely related node.]
+
+  Description [Returns 1 if the cut exists.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeMffsExtendCut( Aig_Man_t * p, Aig_Obj_t * pNode, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vResult )
+{
+    Aig_Obj_t * pObj, * pLeafBest;
+    int i, LevelMax, ConeSize1, ConeSize2, ConeCur1, ConeCur2, ConeBest;
+    // dereference the current cut
+    LevelMax = 0;
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+        LevelMax = AIG_MAX( LevelMax, (int)pObj->Level );
+    if ( LevelMax == 0 )
+        return 0;
+    // dereference the cut
+    ConeSize1 = Aig_NodeDeref_rec( pNode, 0 );
+    // try expanding each node in the boundary
+    ConeBest = AIG_INFINITY;
+    pLeafBest = NULL;
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+    {
+        if ( (int)pObj->Level != LevelMax )
+            continue;
+        ConeCur1 = Aig_NodeDeref_rec( pObj, 0 );
+        if ( ConeBest > ConeCur1 )
+        {
+            ConeBest = ConeCur1;
+            pLeafBest = pObj;
+        }
+        ConeCur2 = Aig_NodeRef_rec( pObj, 0 );
+        assert( ConeCur1 == ConeCur2 );
+    }
+    assert( pLeafBest != NULL );
+    assert( Aig_ObjIsNode(pLeafBest) );
+    // deref the best leaf
+    ConeCur1 = Aig_NodeDeref_rec( pLeafBest, 0 );
+    // collect the cut nodes
+    Vec_PtrClear( vResult );
+    Aig_ManIncrementTravId( p );
+    Aig_NodeMffsSupp_rec( p, pNode, 0, vResult, 1, pLeafBest );
+    // ref the nodes
+    ConeCur2 = Aig_NodeRef_rec( pLeafBest, 0 );
+    assert( ConeCur1 == ConeCur2 );
+    // ref the original node
+    ConeSize2 = Aig_NodeRef_rec( pNode, 0 );
+    assert( ConeSize1 == ConeSize2 );
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigObj.c b/abc70930/src/aig/aig/aigObj.c
new file mode 100644
index 00000000..8323249e
--- /dev/null
+++ b/abc70930/src/aig/aig/aigObj.c
@@ -0,0 +1,416 @@
+/**CFile****************************************************************
+
+  FileName    [aigObj.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Adding/removing objects.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigObj.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates primary input.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ObjCreatePi( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    pObj = Aig_ManFetchMemory( p );
+    pObj->Type = AIG_OBJ_PI;
+    Vec_PtrPush( p->vPis, pObj );
+    p->nObjs[AIG_OBJ_PI]++;
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates primary output with the given driver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ObjCreatePo( Aig_Man_t * p, Aig_Obj_t * pDriver )
+{
+    Aig_Obj_t * pObj;
+    pObj = Aig_ManFetchMemory( p );
+    pObj->Type = AIG_OBJ_PO;
+    Vec_PtrPush( p->vPos, pObj );
+    Aig_ObjConnect( p, pObj, pDriver, NULL );
+    p->nObjs[AIG_OBJ_PO]++;
+    return pObj;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Create the new node assuming it does not exist.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ObjCreate( Aig_Man_t * p, Aig_Obj_t * pGhost )
+{
+    Aig_Obj_t * pObj;
+    assert( !Aig_IsComplement(pGhost) );
+    assert( Aig_ObjIsHash(pGhost) );
+    assert( pGhost == &p->Ghost );
+    // get memory for the new object
+    pObj = Aig_ManFetchMemory( p );
+    pObj->Type = pGhost->Type;
+    // add connections
+    Aig_ObjConnect( p, pObj, pGhost->pFanin0, pGhost->pFanin1 );
+    // update node counters of the manager
+    p->nObjs[Aig_ObjType(pObj)]++;
+    assert( pObj->pData == NULL );
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Connect the object to the fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjConnect( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFan0, Aig_Obj_t * pFan1 )
+{
+    assert( !Aig_IsComplement(pObj) );
+    assert( !Aig_ObjIsPi(pObj) );
+    // add the first fanin
+    pObj->pFanin0 = pFan0;
+    pObj->pFanin1 = pFan1;
+    // increment references of the fanins and add their fanouts
+    if ( pFan0 != NULL )
+    {
+        assert( Aig_ObjFanin0(pObj)->Type > 0 );
+        Aig_ObjRef( Aig_ObjFanin0(pObj) );
+        if ( p->pFanData )
+            Aig_ObjAddFanout( p, Aig_ObjFanin0(pObj), pObj );
+    }
+    if ( pFan1 != NULL )
+    {
+        assert( Aig_ObjFanin1(pObj)->Type > 0 );
+        Aig_ObjRef( Aig_ObjFanin1(pObj) );
+        if ( p->pFanData )
+            Aig_ObjAddFanout( p, Aig_ObjFanin1(pObj), pObj );
+    }
+    // set level and phase
+    pObj->Level = Aig_ObjLevelNew( pObj );
+    pObj->fPhase = Aig_ObjPhaseReal(pFan0) & Aig_ObjPhaseReal(pFan1);
+    // add the node to the structural hash table
+    if ( Aig_ObjIsHash(pObj) )
+        Aig_TableInsert( p, pObj );
+    // add the node to the dynamically updated topological order
+//    if ( p->pOrderData && Aig_ObjIsNode(pObj) )
+//        Aig_ObjOrderInsert( p, pObj->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Disconnects the object from the fanins.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjDisconnect( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    // remove connections
+    if ( pObj->pFanin0 != NULL )
+    {
+        if ( p->pFanData )
+            Aig_ObjRemoveFanout( p, Aig_ObjFanin0(pObj), pObj );
+        Aig_ObjDeref(Aig_ObjFanin0(pObj));
+    }
+    if ( pObj->pFanin1 != NULL )
+    {
+        if ( p->pFanData )
+            Aig_ObjRemoveFanout( p, Aig_ObjFanin1(pObj), pObj );
+        Aig_ObjDeref(Aig_ObjFanin1(pObj));
+    }
+    // remove the node from the structural hash table
+    if ( Aig_ObjIsHash(pObj) )
+        Aig_TableDelete( p, pObj );
+    // add the first fanin
+    pObj->pFanin0 = NULL;
+    pObj->pFanin1 = NULL;
+    // remove the node from the dynamically updated topological order
+//    if ( p->pOrderData && Aig_ObjIsNode(pObj) )
+//        Aig_ObjOrderRemove( p, pObj->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjDelete( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    assert( !Aig_ObjIsTerm(pObj) );
+    assert( Aig_ObjRefs(pObj) == 0 );
+    if ( p->pFanData && Aig_ObjIsBuf(pObj) )
+        Vec_PtrRemove( p->vBufs, pObj );
+    p->nObjs[pObj->Type]--;
+    Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+    Aig_ManRecycleMemory( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the MFFC of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjDelete_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int fFreeTop )
+{
+    Aig_Obj_t * pFanin0, * pFanin1;
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsConst1(pObj) || Aig_ObjIsPi(pObj) )
+        return;
+    assert( !Aig_ObjIsPo(pObj) );
+    pFanin0 = Aig_ObjFanin0(pObj);
+    pFanin1 = Aig_ObjFanin1(pObj);
+    Aig_ObjDisconnect( p, pObj );
+    if ( fFreeTop )
+        Aig_ObjDelete( p, pObj );
+    if ( pFanin0 && !Aig_ObjIsNone(pFanin0) && Aig_ObjRefs(pFanin0) == 0 )
+        Aig_ObjDelete_rec( p, pFanin0, 1 );
+    if ( pFanin1 && !Aig_ObjIsNone(pFanin1) && Aig_ObjRefs(pFanin1) == 0 )
+        Aig_ObjDelete_rec( p, pFanin1, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces the first fanin of the node by the new fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjPatchFanin0( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFaninNew )
+{
+    Aig_Obj_t * pFaninOld;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsPo(pObj) );
+    pFaninOld = Aig_ObjFanin0(pObj);
+    // decrement ref and remove fanout
+    if ( p->pFanData )
+        Aig_ObjRemoveFanout( p, pFaninOld, pObj );
+    Aig_ObjDeref( pFaninOld );
+    // update the fanin
+    pObj->pFanin0 = pFaninNew;
+    // increment ref and add fanout
+    if ( p->pFanData )
+        Aig_ObjAddFanout( p, Aig_ObjFanin0(pObj), pObj );
+    Aig_ObjRef( Aig_ObjFanin0(pObj) );
+    // get rid of old fanin
+    if ( !Aig_ObjIsPi(pFaninOld) && !Aig_ObjIsConst1(pFaninOld) && Aig_ObjRefs(pFaninOld) == 0 )
+        Aig_ObjDelete_rec( p, pFaninOld, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces node with a buffer fanin by a node without them.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_NodeFixBufferFanins( Aig_Man_t * p, Aig_Obj_t * pObj, int fNodesOnly, int fUpdateLevel )
+{
+    Aig_Obj_t * pFanReal0, * pFanReal1, * pResult;
+    p->nBufFixes++;
+    if ( Aig_ObjIsPo(pObj) )
+    {
+        assert( Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) );
+        pFanReal0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+        assert( Aig_ObjPhaseReal(Aig_ObjChild0(pObj)) == Aig_ObjPhaseReal(pFanReal0) );
+        Aig_ObjPatchFanin0( p, pObj, pFanReal0 );
+        return;
+    }
+    assert( Aig_ObjIsNode(pObj) );
+    assert( Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) || Aig_ObjIsBuf(Aig_ObjFanin1(pObj)) );
+    // get the real fanins
+    pFanReal0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+    pFanReal1 = Aig_ObjReal_rec( Aig_ObjChild1(pObj) );
+    // get the new node
+    if ( Aig_ObjIsNode(pObj) )
+        pResult = Aig_Oper( p, pFanReal0, pFanReal1, Aig_ObjType(pObj) );
+//    else if ( Aig_ObjIsLatch(pObj) )
+//        pResult = Aig_Latch( p, pFanReal0, Aig_ObjInit(pObj) );
+    else 
+        assert( 0 );
+    // replace the node with buffer by the node without buffer
+    Aig_ObjReplace( p, pObj, pResult, fNodesOnly, fUpdateLevel );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     [] 
+
+***********************************************************************/
+int Aig_ManPropagateBuffers( Aig_Man_t * p, int fNodesOnly, int fUpdateLevel )
+{
+    Aig_Obj_t * pObj;
+    int nSteps;
+    assert( p->pFanData );
+    for ( nSteps = 0; Vec_PtrSize(p->vBufs) > 0; nSteps++ )
+    {
+        // get the node with a buffer fanin
+        for ( pObj = Vec_PtrEntryLast(p->vBufs); Aig_ObjIsBuf(pObj); pObj = Aig_ObjFanout0(p, pObj) );
+        // replace this node by a node without buffer
+        Aig_NodeFixBufferFanins( p, pObj, fNodesOnly, fUpdateLevel );
+        // stop if a cycle occured
+        if ( nSteps > 1000000 )
+        {
+            printf( "Error: A cycle is encountered while propagating buffers.\n" );
+            break;
+        }
+    }
+    return nSteps;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces one object by another.]
+
+  Description [The new object (pObjNew) should be used instead of the old 
+  object (pObjOld). If the new object is complemented or used, the buffer 
+  is added and the new object remains in the manager; otherwise, the new
+  object is deleted.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjReplace( Aig_Man_t * p, Aig_Obj_t * pObjOld, Aig_Obj_t * pObjNew, int fNodesOnly, int fUpdateLevel )
+{
+    Aig_Obj_t * pObjNewR = Aig_Regular(pObjNew);
+    // the object to be replaced cannot be complemented
+    assert( !Aig_IsComplement(pObjOld) );
+    // the object to be replaced cannot be a terminal
+    assert( !Aig_ObjIsPi(pObjOld) && !Aig_ObjIsPo(pObjOld) );
+    // the object to be used cannot be a buffer or a PO
+    assert( !Aig_ObjIsBuf(pObjNewR) && !Aig_ObjIsPo(pObjNewR) );
+    // the object cannot be the same
+    assert( pObjOld != pObjNewR );
+    // make sure object is not pointing to itself
+    assert( pObjOld != Aig_ObjFanin0(pObjNewR) );
+    assert( pObjOld != Aig_ObjFanin1(pObjNewR) );
+    // recursively delete the old node - but leave the object there
+    pObjNewR->nRefs++;
+    Aig_ObjDelete_rec( p, pObjOld, 0 );
+    pObjNewR->nRefs--;
+    // if the new object is complemented or already used, create a buffer
+    p->nObjs[pObjOld->Type]--;
+    if ( Aig_IsComplement(pObjNew) || Aig_ObjRefs(pObjNew) > 0 || (fNodesOnly && !Aig_ObjIsNode(pObjNew)) )
+    {
+        pObjOld->Type = AIG_OBJ_BUF;
+        Aig_ObjConnect( p, pObjOld, pObjNew, NULL );
+        p->nBufReplaces++;
+    }
+    else
+    {
+        Aig_Obj_t * pFanin0 = pObjNew->pFanin0;
+        Aig_Obj_t * pFanin1 = pObjNew->pFanin1;
+        int LevelOld = pObjOld->Level;
+        pObjOld->Type = pObjNew->Type;
+        Aig_ObjDisconnect( p, pObjNew );
+        Aig_ObjConnect( p, pObjOld, pFanin0, pFanin1 );
+        // delete the new object
+        Aig_ObjDelete( p, pObjNew );
+        // update levels
+        if ( p->pFanData )
+        {
+            pObjOld->Level = LevelOld;
+            Aig_ManUpdateLevel( p, pObjOld );
+        }
+        if ( fUpdateLevel )
+        {
+            Aig_ObjClearReverseLevel( p, pObjOld );
+            Aig_ManUpdateReverseLevel( p, pObjOld );
+        }
+    }
+    p->nObjs[pObjOld->Type]++;
+    // store buffers if fanout is allocated
+    if ( p->pFanData && Aig_ObjIsBuf(pObjOld) )
+    {
+        Vec_PtrPush( p->vBufs, pObjOld );
+        p->nBufMax = AIG_MAX( p->nBufMax, Vec_PtrSize(p->vBufs) );
+        Aig_ManPropagateBuffers( p, fNodesOnly, fUpdateLevel );
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigOper.c b/abc70930/src/aig/aig/aigOper.c
new file mode 100644
index 00000000..66a6dce1
--- /dev/null
+++ b/abc70930/src/aig/aig/aigOper.c
@@ -0,0 +1,532 @@
+/**CFile****************************************************************
+
+  FileName    [aigOper.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [AIG operations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigOper.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// procedure to detect an EXOR gate
+static inline int Aig_ObjIsExorType( Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Obj_t ** ppFan0, Aig_Obj_t ** ppFan1 )
+{
+    if ( !Aig_IsComplement(p0) || !Aig_IsComplement(p1) )
+        return 0;
+    p0 = Aig_Regular(p0);
+    p1 = Aig_Regular(p1);
+    if ( !Aig_ObjIsAnd(p0) || !Aig_ObjIsAnd(p1) )
+        return 0;
+    if ( Aig_ObjFanin0(p0) != Aig_ObjFanin0(p1) || Aig_ObjFanin1(p0) != Aig_ObjFanin1(p1) )
+        return 0;
+    if ( Aig_ObjFaninC0(p0) == Aig_ObjFaninC0(p1) || Aig_ObjFaninC1(p0) == Aig_ObjFaninC1(p1) )
+        return 0;
+    *ppFan0 = Aig_ObjChild0(p0);
+    *ppFan1 = Aig_ObjChild1(p0);
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns i-th elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_IthVar( Aig_Man_t * p, int i )
+{
+    int v;
+    for ( v = Aig_ManPiNum(p); v <= i; v++ )
+        Aig_ObjCreatePi( p );
+    assert( i < Vec_PtrSize(p->vPis) );
+    return Aig_ManPi( p, i );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform one operation.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Oper( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1, Aig_Type_t Type )
+{
+    if ( Type == AIG_OBJ_AND )
+        return Aig_And( p, p0, p1 );
+    if ( Type == AIG_OBJ_EXOR )
+        return Aig_Exor( p, p0, p1 );
+    assert( 0 );
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_CanonPair_rec( Aig_Man_t * p, Aig_Obj_t * pGhost )
+{
+    Aig_Obj_t * pResult, * pLat0, * pLat1;
+    int fCompl0, fCompl1;
+    Aig_Type_t Type;
+    assert( Aig_ObjIsNode(pGhost) );
+    // consider the case when the pair is canonical
+    if ( !Aig_ObjIsLatch(Aig_ObjFanin0(pGhost)) || !Aig_ObjIsLatch(Aig_ObjFanin1(pGhost)) )
+    {
+        if ( (pResult = Aig_TableLookup( p, pGhost )) )
+            return pResult;
+        return Aig_ObjCreate( p, pGhost );
+    }
+    /// remember the latches
+    pLat0 = Aig_ObjFanin0(pGhost);
+    pLat1 = Aig_ObjFanin1(pGhost);
+    // remember type and compls
+    Type = Aig_ObjType(pGhost);
+    fCompl0 = Aig_ObjFaninC0(pGhost);
+    fCompl1 = Aig_ObjFaninC1(pGhost);
+    // call recursively
+    pResult = Aig_Oper( p, Aig_NotCond(Aig_ObjChild0(pLat0), fCompl0), Aig_NotCond(Aig_ObjChild0(pLat1), fCompl1), Type );
+    // build latch on top of this
+    return Aig_Latch( p, pResult, (Type == AIG_OBJ_AND)? fCompl0 & fCompl1 : fCompl0 ^ fCompl1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_And( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
+{
+    Aig_Obj_t * pGhost, * pResult;
+//    Aig_Obj_t * pFan0, * pFan1;
+    // check trivial cases
+    if ( p0 == p1 )
+        return p0;
+    if ( p0 == Aig_Not(p1) )
+        return Aig_Not(p->pConst1);
+    if ( Aig_Regular(p0) == p->pConst1 )
+        return p0 == p->pConst1 ? p1 : Aig_Not(p->pConst1);
+    if ( Aig_Regular(p1) == p->pConst1 )
+        return p1 == p->pConst1 ? p0 : Aig_Not(p->pConst1);
+    // check not so trivial cases
+    if ( p->fAddStrash && (Aig_ObjIsNode(Aig_Regular(p0)) || Aig_ObjIsNode(Aig_Regular(p1))) )
+    { // http://fmv.jku.at/papers/BrummayerBiere-MEMICS06.pdf
+        Aig_Obj_t * pFanA, * pFanB, * pFanC, * pFanD;
+        pFanA = Aig_ObjChild0(Aig_Regular(p0));
+        pFanB = Aig_ObjChild1(Aig_Regular(p0));
+        pFanC = Aig_ObjChild0(Aig_Regular(p1));
+        pFanD = Aig_ObjChild1(Aig_Regular(p1));
+        if ( Aig_IsComplement(p0) )
+        {
+            if ( pFanA == Aig_Not(p1) || pFanB == Aig_Not(p1) )
+                return p1;
+            if ( pFanB == p1 )
+                return Aig_And( p, Aig_Not(pFanA), pFanB );
+            if ( pFanA == p1 )
+                return Aig_And( p, Aig_Not(pFanB), pFanA );
+        }
+        else
+        {
+            if ( pFanA == Aig_Not(p1) || pFanB == Aig_Not(p1) )
+                return Aig_Not(p->pConst1);
+            if ( pFanA == p1 || pFanB == p1 )
+                return p0;
+        }
+        if ( Aig_IsComplement(p1) )
+        {
+            if ( pFanC == Aig_Not(p0) || pFanD == Aig_Not(p0) )
+                return p0;
+            if ( pFanD == p0 )
+                return Aig_And( p, Aig_Not(pFanC), pFanD );
+            if ( pFanC == p0 )
+                return Aig_And( p, Aig_Not(pFanD), pFanC );
+        }
+        else
+        {
+            if ( pFanC == Aig_Not(p0) || pFanD == Aig_Not(p0) )
+                return Aig_Not(p->pConst1);
+            if ( pFanC == p0 || pFanD == p0 )
+                return p1;
+        }
+        if ( !Aig_IsComplement(p0) && !Aig_IsComplement(p1) ) 
+        {
+            if ( pFanA == Aig_Not(pFanC) || pFanA == Aig_Not(pFanD) || pFanB == Aig_Not(pFanC) || pFanB == Aig_Not(pFanD) )
+                return Aig_Not(p->pConst1);
+            if ( pFanA == pFanC || pFanB == pFanC )
+                return Aig_And( p, p0, pFanD );
+            if ( pFanB == pFanC || pFanB == pFanD )
+                return Aig_And( p, pFanA, p1 );
+            if ( pFanA == pFanD || pFanB == pFanD )
+                return Aig_And( p, p0, pFanC );
+            if ( pFanA == pFanC || pFanA == pFanD )
+                return Aig_And( p, pFanB, p1 );
+        }
+        else if ( Aig_IsComplement(p0) && !Aig_IsComplement(p1) )
+        {
+            if ( pFanA == Aig_Not(pFanC) || pFanA == Aig_Not(pFanD) || pFanB == Aig_Not(pFanC) || pFanB == Aig_Not(pFanD) )
+                return p1;
+            if ( pFanB == pFanC || pFanB == pFanD )
+                return Aig_And( p, Aig_Not(pFanA), p1 );
+            if ( pFanA == pFanC || pFanA == pFanD )
+                return Aig_And( p, Aig_Not(pFanB), p1 );
+        }
+        else if ( !Aig_IsComplement(p0) && Aig_IsComplement(p1) )
+        {
+            if ( pFanC == Aig_Not(pFanA) || pFanC == Aig_Not(pFanB) || pFanD == Aig_Not(pFanA) || pFanD == Aig_Not(pFanB) )
+                return p0;
+            if ( pFanD == pFanA || pFanD == pFanB )
+                return Aig_And( p, Aig_Not(pFanC), p0 );
+            if ( pFanC == pFanA || pFanC == pFanB )
+                return Aig_And( p, Aig_Not(pFanD), p0 );
+        }
+        else // if ( Aig_IsComplement(p0) && Aig_IsComplement(p1) )
+        {
+            if ( pFanA == pFanD && pFanB == Aig_Not(pFanC) )
+                return Aig_Not(pFanA);
+            if ( pFanB == pFanC && pFanA == Aig_Not(pFanD) )
+                return Aig_Not(pFanB);
+            if ( pFanA == pFanC && pFanB == Aig_Not(pFanD) )
+                return Aig_Not(pFanA);
+            if ( pFanB == pFanD && pFanA == Aig_Not(pFanC) )
+                return Aig_Not(pFanB);
+        }
+    }
+    // check if it can be an EXOR gate
+//    if ( Aig_ObjIsExorType( p0, p1, &pFan0, &pFan1 ) )
+//        return Aig_Exor( p, pFan0, pFan1 );
+    pGhost = Aig_ObjCreateGhost( p, p0, p1, AIG_OBJ_AND );
+    pResult = Aig_CanonPair_rec( p, pGhost );
+    return pResult;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Latch( Aig_Man_t * p, Aig_Obj_t * pObj, int fInitOne )
+{
+    Aig_Obj_t * pGhost, * pResult;
+    pGhost = Aig_ObjCreateGhost( p, Aig_NotCond(pObj, fInitOne), NULL, AIG_OBJ_LATCH );
+    pResult = Aig_TableLookup( p, pGhost );
+    if ( pResult == NULL )
+        pResult = Aig_ObjCreate( p, pGhost );
+    return Aig_NotCond( pResult, fInitOne );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Exor( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
+{
+/*
+    Aig_Obj_t * pGhost, * pResult;
+    // check trivial cases
+    if ( p0 == p1 )
+        return Aig_Not(p->pConst1);
+    if ( p0 == Aig_Not(p1) )
+        return p->pConst1;
+    if ( Aig_Regular(p0) == p->pConst1 )
+        return Aig_NotCond( p1, p0 == p->pConst1 );
+    if ( Aig_Regular(p1) == p->pConst1 )
+        return Aig_NotCond( p0, p1 == p->pConst1 );
+    // check the table
+    pGhost = Aig_ObjCreateGhost( p, p0, p1, AIG_OBJ_EXOR );
+    if ( pResult = Aig_TableLookup( p, pGhost ) )
+        return pResult;
+    return Aig_ObjCreate( p, pGhost );
+*/
+    return Aig_Or( p, Aig_And(p, p0, Aig_Not(p1)), Aig_And(p, Aig_Not(p0), p1) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements Boolean OR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Or( Aig_Man_t * p, Aig_Obj_t * p0, Aig_Obj_t * p1 )
+{
+    return Aig_Not( Aig_And( p, Aig_Not(p0), Aig_Not(p1) ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Mux( Aig_Man_t * p, Aig_Obj_t * pC, Aig_Obj_t * p1, Aig_Obj_t * p0 )
+{
+/*    
+    Aig_Obj_t * pTempA1, * pTempA2, * pTempB1, * pTempB2, * pTemp;
+    int Count0, Count1;
+    // consider trivial cases
+    if ( p0 == Aig_Not(p1) )
+        return Aig_Exor( p, pC, p0 );
+    // other cases can be added
+    // implement the first MUX (F = C * x1 + C' * x0)
+
+    // check for constants here!!!
+
+    pTempA1 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, pC,          p1, AIG_OBJ_AND) );
+    pTempA2 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pC), p0, AIG_OBJ_AND) );
+    if ( pTempA1 && pTempA2 )
+    {
+        pTemp = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pTempA1), Aig_Not(pTempA2), AIG_OBJ_AND) );
+        if ( pTemp ) return Aig_Not(pTemp);
+    }
+    Count0 = (pTempA1 != NULL) + (pTempA2 != NULL);
+    // implement the second MUX (F' = C * x1' + C' * x0')
+    pTempB1 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, pC,          Aig_Not(p1), AIG_OBJ_AND) );
+    pTempB2 = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pC), Aig_Not(p0), AIG_OBJ_AND) );
+    if ( pTempB1 && pTempB2 )
+    {
+        pTemp = Aig_TableLookup( p, Aig_ObjCreateGhost(p, Aig_Not(pTempB1), Aig_Not(pTempB2), AIG_OBJ_AND) );
+        if ( pTemp ) return pTemp;
+    }
+    Count1 = (pTempB1 != NULL) + (pTempB2 != NULL);
+    // compare and decide which one to implement
+    if ( Count0 >= Count1 )
+    {
+        pTempA1 = pTempA1? pTempA1 : Aig_And(p, pC,          p1);
+        pTempA2 = pTempA2? pTempA2 : Aig_And(p, Aig_Not(pC), p0);
+        return Aig_Or( p, pTempA1, pTempA2 );
+    }
+    pTempB1 = pTempB1? pTempB1 : Aig_And(p, pC,          Aig_Not(p1));
+    pTempB2 = pTempB2? pTempB2 : Aig_And(p, Aig_Not(pC), Aig_Not(p0));
+    return Aig_Not( Aig_Or( p, pTempB1, pTempB2 ) );
+*/
+    return Aig_Or( p, Aig_And(p, pC, p1), Aig_And(p, Aig_Not(pC), p0) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Maj( Aig_Man_t * p, Aig_Obj_t * pA, Aig_Obj_t * pB, Aig_Obj_t * pC )
+{
+    return Aig_Or( p, Aig_Or(p, Aig_And(p, pA, pB), Aig_And(p, pA, pC)), Aig_And(p, pB, pC) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs the well-balanced tree of gates.]
+
+  Description [Disregards levels and possible logic sharing.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Multi_rec( Aig_Man_t * p, Aig_Obj_t ** ppObjs, int nObjs, Aig_Type_t Type )
+{
+    Aig_Obj_t * pObj1, * pObj2;
+    if ( nObjs == 1 )
+        return ppObjs[0];
+    pObj1 = Aig_Multi_rec( p, ppObjs,           nObjs/2,         Type );
+    pObj2 = Aig_Multi_rec( p, ppObjs + nObjs/2, nObjs - nObjs/2, Type );
+    return Aig_Oper( p, pObj1, pObj2, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Old code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Multi( Aig_Man_t * p, Aig_Obj_t ** pArgs, int nArgs, Aig_Type_t Type )
+{
+    assert( Type == AIG_OBJ_AND || Type == AIG_OBJ_EXOR );
+    assert( nArgs > 0 );
+    return Aig_Multi_rec( p, pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_Miter( Aig_Man_t * p, Vec_Ptr_t * vPairs )
+{
+    int i;
+    assert( vPairs->nSize > 0 );
+    assert( vPairs->nSize % 2 == 0 );
+    for ( i = 0; i < vPairs->nSize; i += 2 )
+        vPairs->pArray[i/2] = Aig_Not( Aig_Exor( p, vPairs->pArray[i], vPairs->pArray[i+1] ) );
+    vPairs->nSize = vPairs->nSize/2;
+    return Aig_Not( Aig_Multi_rec( p, (Aig_Obj_t **)vPairs->pArray, vPairs->nSize, AIG_OBJ_AND ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_MiterTwo( Aig_Man_t * p, Vec_Ptr_t * vNodes1, Vec_Ptr_t * vNodes2 )
+{
+    int i;
+    assert( vNodes1->nSize > 0 && vNodes1->nSize > 0 );
+    assert( vNodes1->nSize == vNodes2->nSize );
+    for ( i = 0; i < vNodes1->nSize; i++ )
+        vNodes1->pArray[i] = Aig_Not( Aig_Exor( p, vNodes1->pArray[i], vNodes2->pArray[i] ) );
+    return Aig_Not( Aig_Multi_rec( p, (Aig_Obj_t **)vNodes1->pArray, vNodes1->nSize, AIG_OBJ_AND ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_CreateAnd( Aig_Man_t * p, int nVars )
+{
+    Aig_Obj_t * pFunc;
+    int i;
+    pFunc = Aig_ManConst1( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Aig_And( p, pFunc, Aig_IthVar(p, i) );
+    return pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_CreateOr( Aig_Man_t * p, int nVars )
+{
+    Aig_Obj_t * pFunc;
+    int i;
+    pFunc = Aig_ManConst0( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Aig_Or( p, pFunc, Aig_IthVar(p, i) );
+    return pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_CreateExor( Aig_Man_t * p, int nVars )
+{
+    Aig_Obj_t * pFunc;
+    int i;
+    pFunc = Aig_ManConst0( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Aig_Exor( p, pFunc, Aig_IthVar(p, i) );
+    return pFunc;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigOrder.c b/abc70930/src/aig/aig/aigOrder.c
new file mode 100644
index 00000000..62aeca6e
--- /dev/null
+++ b/abc70930/src/aig/aig/aigOrder.c
@@ -0,0 +1,171 @@
+/**CFile****************************************************************
+
+  FileName    [aigOrder.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Dynamically updated topological order.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigOrder.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Initializes the order datastructure.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManOrderStart( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    assert( Aig_ManBufNum(p) == 0 );
+    // allocate order datastructure
+    assert( p->pOrderData == NULL );
+    p->nOrderAlloc = 2 * Aig_ManObjNumMax(p);
+    if ( p->nOrderAlloc < (1<<12) )
+        p->nOrderAlloc = (1<<12);
+    p->pOrderData = ALLOC( unsigned, 2 * p->nOrderAlloc );
+    memset( p->pOrderData, 0xFF, sizeof(unsigned) * 2 * p->nOrderAlloc );
+    // add the constant node
+    p->pOrderData[0] = p->pOrderData[1] = 0;
+    p->iPrev = p->iNext = 0;
+    // add the internal nodes
+    Aig_ManForEachNode( p, pObj, i )
+        Aig_ObjOrderInsert( p, pObj->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the order datastructure.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManOrderStop( Aig_Man_t * p )
+{
+    assert( p->pOrderData );
+    FREE( p->pOrderData );
+    p->nOrderAlloc = 0;
+    p->iPrev = p->iNext = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts an entry before iNext.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjOrderInsert( Aig_Man_t * p, int ObjId )
+{
+    int iPrev;
+    assert( ObjId != 0 );
+    assert( Aig_ObjIsNode( Aig_ManObj(p, ObjId) ) );
+    if ( ObjId >= p->nOrderAlloc )
+    {
+        int nOrderAlloc = 2 * ObjId; 
+        p->pOrderData = REALLOC( unsigned, p->pOrderData, 2 * nOrderAlloc );
+        memset( p->pOrderData + 2 * p->nOrderAlloc, 0xFF, sizeof(unsigned) * 2 * (nOrderAlloc - p->nOrderAlloc) );
+        p->nOrderAlloc = nOrderAlloc;
+    }
+    assert( p->pOrderData[2*ObjId] == 0xFFFFFFFF );   // prev
+    assert( p->pOrderData[2*ObjId+1] == 0xFFFFFFFF ); // next
+    iPrev = p->pOrderData[2*p->iNext];
+    assert( p->pOrderData[2*iPrev+1] == (unsigned)p->iNext );
+    p->pOrderData[2*ObjId] = iPrev;
+    p->pOrderData[2*iPrev+1] = ObjId;
+    p->pOrderData[2*p->iNext] = ObjId;
+    p->pOrderData[2*ObjId+1] = p->iNext;
+    p->nAndTotal++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes the entry.]
+
+  Description [If iPrev is removed, it slides backward. 
+  If iNext is removed, it slides forward.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjOrderRemove( Aig_Man_t * p, int ObjId )
+{
+    int iPrev, iNext;
+    assert( ObjId != 0 );
+    assert( Aig_ObjIsNode( Aig_ManObj(p, ObjId) ) );
+    iPrev = p->pOrderData[2*ObjId];
+    iNext = p->pOrderData[2*ObjId+1];
+    p->pOrderData[2*ObjId] = 0xFFFFFFFF;
+    p->pOrderData[2*ObjId+1] = 0xFFFFFFFF;
+    p->pOrderData[2*iNext] = iPrev;
+    p->pOrderData[2*iPrev+1] = iNext;
+    if ( p->iPrev == ObjId )
+    {
+        p->nAndPrev--;
+        p->iPrev = iPrev;
+    }
+    if ( p->iNext == ObjId )
+        p->iNext = iNext;
+    p->nAndTotal--;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Advances the order forward.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjOrderAdvance( Aig_Man_t * p )
+{
+    assert( p->pOrderData );
+    assert( p->pOrderData[2*p->iPrev+1] == (unsigned)p->iNext );
+    p->iPrev = p->iNext;
+    p->nAndPrev++;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigPart.c b/abc70930/src/aig/aig/aigPart.c
new file mode 100644
index 00000000..3acd1aeb
--- /dev/null
+++ b/abc70930/src/aig/aig/aigPart.c
@@ -0,0 +1,990 @@
+/**CFile****************************************************************
+
+  FileName    [aigPart.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [AIG partitioning package.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigPart.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Part_Man_t_     Part_Man_t;
+struct Part_Man_t_
+{
+    int              nChunkSize;    // the size of one chunk of memory (~1 Mb)
+    int              nStepSize;     // the step size in saving memory (~64 bytes)
+    char *           pFreeBuf;      // the pointer to free memory
+    int              nFreeSize;     // the size of remaining free memory
+    Vec_Ptr_t *      vMemory;       // the memory allocated
+    Vec_Ptr_t *      vFree;         // the vector of free pieces of memory
+};
+
+typedef struct Part_One_t_     Part_One_t;
+struct Part_One_t_
+{
+    int              nRefs;         // the number of references
+    int              nOuts;         // the number of outputs
+    int              nOutsAlloc;    // the array size
+    int              pOuts[0];      // the array of outputs
+};
+
+static inline int    Part_SizeType( int nSize, int nStepSize )     { return nSize / nStepSize + ((nSize % nStepSize) > 0); }
+static inline char * Part_OneNext( char * pPart )                  { return *((char **)pPart);                             }
+static inline void   Part_OneSetNext( char * pPart, char * pNext ) { *((char **)pPart) = pNext;                            }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Start the memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Part_Man_t * Part_ManStart( int nChunkSize, int nStepSize )
+{
+    Part_Man_t * p;
+    p = ALLOC( Part_Man_t, 1 );
+    memset( p, 0, sizeof(Part_Man_t) );
+    p->nChunkSize = nChunkSize;
+    p->nStepSize  = nStepSize;
+    p->vMemory    = Vec_PtrAlloc( 1000 );
+    p->vFree      = Vec_PtrAlloc( 1000 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Part_ManStop( Part_Man_t * p )
+{
+    void * pMemory;
+    int i;
+    Vec_PtrForEachEntry( p->vMemory, pMemory, i )
+        free( pMemory );
+    Vec_PtrFree( p->vMemory );
+    Vec_PtrFree( p->vFree );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Fetches the memory entry of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Part_ManFetch( Part_Man_t * p, int nSize )
+{
+    int Type, nSizeReal;
+    char * pMemory;
+    assert( nSize > 0 );
+    Type = Part_SizeType( nSize, p->nStepSize );
+    Vec_PtrFillExtra( p->vFree, Type + 1, NULL );
+    if ( (pMemory = Vec_PtrEntry( p->vFree, Type )) )
+    {
+        Vec_PtrWriteEntry( p->vFree, Type, Part_OneNext(pMemory) );
+        return pMemory;
+    }
+    nSizeReal = p->nStepSize * Type;
+    if ( p->nFreeSize < nSizeReal )
+    {
+        p->pFreeBuf = ALLOC( char, p->nChunkSize );
+        p->nFreeSize = p->nChunkSize;
+        Vec_PtrPush( p->vMemory, p->pFreeBuf );
+    }
+    assert( p->nFreeSize >= nSizeReal );
+    pMemory = p->pFreeBuf;
+    p->pFreeBuf  += nSizeReal;
+    p->nFreeSize -= nSizeReal;
+    return pMemory;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recycles the memory entry of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Part_ManRecycle( Part_Man_t * p, char * pMemory, int nSize )
+{
+    int Type;
+    Type = Part_SizeType( nSize, p->nStepSize );
+    Vec_PtrFillExtra( p->vFree, Type + 1, NULL );
+    Part_OneSetNext( pMemory, Vec_PtrEntry(p->vFree, Type) );
+    Vec_PtrWriteEntry( p->vFree, Type, pMemory );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Fetches the memory entry of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Part_One_t * Part_ManFetchEntry( Part_Man_t * p, int nWords, int nRefs )
+{
+    Part_One_t * pPart;
+    pPart = (Part_One_t *)Part_ManFetch( p, sizeof(Part_One_t) + sizeof(int) * nWords );
+    pPart->nRefs = nRefs;
+    pPart->nOuts = 0;
+    pPart->nOutsAlloc = nWords;
+    return pPart;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recycles the memory entry of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Part_ManRecycleEntry( Part_Man_t * p, Part_One_t * pEntry )
+{
+    assert( pEntry->nOuts <= pEntry->nOutsAlloc );
+    assert( pEntry->nOuts >= pEntry->nOutsAlloc/2 );
+    Part_ManRecycle( p, (char *)pEntry, sizeof(Part_One_t) + sizeof(int) * pEntry->nOutsAlloc );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two entries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Part_One_t * Part_ManMergeEntry( Part_Man_t * pMan, Part_One_t * p1, Part_One_t * p2, int nRefs )
+{
+    Part_One_t * p = Part_ManFetchEntry( pMan, p1->nOuts + p2->nOuts, nRefs );
+    int * pBeg1 = p1->pOuts;
+    int * pBeg2 = p2->pOuts;
+    int * pBeg  = p->pOuts;
+    int * pEnd1 = p1->pOuts + p1->nOuts;
+    int * pEnd2 = p2->pOuts + p2->nOuts;
+    while ( pBeg1 < pEnd1 && pBeg2 < pEnd2 )
+    {
+        if ( *pBeg1 == *pBeg2 )
+            *pBeg++ = *pBeg1++, pBeg2++;
+        else if ( *pBeg1 < *pBeg2 )
+            *pBeg++ = *pBeg1++;
+        else 
+            *pBeg++ = *pBeg2++;
+    }
+    while ( pBeg1 < pEnd1 )
+        *pBeg++ = *pBeg1++;
+    while ( pBeg2 < pEnd2 )
+        *pBeg++ = *pBeg2++;
+    p->nOuts = pBeg - p->pOuts;
+    assert( p->nOuts <= p->nOutsAlloc );
+    assert( p->nOuts >= p1->nOuts );
+    assert( p->nOuts >= p2->nOuts );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Tranfers the entry.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Part_ManTransferEntry( Part_One_t * p )
+{
+    Vec_Int_t * vSupp;
+    int i;
+    vSupp = Vec_IntAlloc( p->nOuts );
+    for ( i = 0; i < p->nOuts; i++ )
+        Vec_IntPush( vSupp, p->pOuts[i] );
+    return vSupp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes supports of the POs in the multi-output AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManSupports( Aig_Man_t * pMan )
+{
+    Vec_Ptr_t * vSupports;
+    Vec_Int_t * vSupp;
+    Part_Man_t * p;
+    Part_One_t * pPart0, * pPart1;
+    Aig_Obj_t * pObj;
+    int i;
+    // set the number of PIs/POs
+    Aig_ManForEachPi( pMan, pObj, i )
+        pObj->pNext = (Aig_Obj_t *)(long)i;
+    Aig_ManForEachPo( pMan, pObj, i )
+        pObj->pNext = (Aig_Obj_t *)(long)i;
+    // start the support computation manager
+    p = Part_ManStart( 1 << 20, 1 << 6 );
+    // consider objects in the topological order
+    vSupports = Vec_PtrAlloc( Aig_ManPoNum(pMan) );
+    Aig_ManCleanData(pMan);
+    Aig_ManForEachObj( pMan, pObj, i )
+    {
+        if ( Aig_ObjIsNode(pObj) )
+        {
+            pPart0 = Aig_ObjFanin0(pObj)->pData;
+            pPart1 = Aig_ObjFanin1(pObj)->pData;
+            pObj->pData = Part_ManMergeEntry( p, pPart0, pPart1, pObj->nRefs );
+            assert( pPart0->nRefs > 0 );
+            if ( --pPart0->nRefs == 0 )
+                Part_ManRecycleEntry( p, pPart0 );
+            assert( pPart1->nRefs > 0 );
+            if ( --pPart1->nRefs == 0 )
+                Part_ManRecycleEntry( p, pPart1 );
+            continue;
+        }
+        if ( Aig_ObjIsPo(pObj) )
+        {
+            pPart0 = Aig_ObjFanin0(pObj)->pData;
+            vSupp = Part_ManTransferEntry(pPart0);
+            Vec_IntPush( vSupp, (int)(long)pObj->pNext );
+            Vec_PtrPush( vSupports, vSupp );
+            assert( pPart0->nRefs > 0 );
+            if ( --pPart0->nRefs == 0 )
+                Part_ManRecycleEntry( p, pPart0 );
+            continue;
+        }
+        if ( Aig_ObjIsPi(pObj) )
+        {
+            if ( pObj->nRefs )
+            {
+                pPart0 = Part_ManFetchEntry( p, 1, pObj->nRefs );
+                pPart0->pOuts[ pPart0->nOuts++ ] = (int)(long)pObj->pNext;
+                pObj->pData = pPart0;
+            }
+            continue;
+        }
+        if ( Aig_ObjIsConst1(pObj) )
+        {
+            if ( pObj->nRefs )
+                pObj->pData = Part_ManFetchEntry( p, 0, pObj->nRefs );
+            continue;
+        }
+        assert( 0 );
+    }
+//printf( "Memory usage = %d Mb.\n", Vec_PtrSize(p->vMemory) * p->nChunkSize / (1<<20) );
+    Part_ManStop( p );
+    // sort supports by size
+    Vec_VecSort( (Vec_Vec_t *)vSupports, 1 );
+    // clear the number of PIs/POs
+    Aig_ManForEachPi( pMan, pObj, i )
+        pObj->pNext = NULL;
+    Aig_ManForEachPo( pMan, pObj, i )
+        pObj->pNext = NULL;
+/*
+    Aig_ManForEachPo( pMan, pObj, i )
+        printf( "%d ", Vec_IntSize( (Vec_Int_t *)Vec_VecEntry(vSupports, i) ) );
+    printf( "\n" );
+*/
+    return vSupports;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Start char-bases support representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Aig_ManSuppCharStart( Vec_Int_t * vOne, int nPis )
+{
+    unsigned * pBuffer;
+    int i, Entry;
+    int nWords = Aig_BitWordNum(nPis);
+    pBuffer = ALLOC( unsigned, nWords );
+    memset( pBuffer, 0, sizeof(unsigned) * nWords );
+    Vec_IntForEachEntry( vOne, Entry, i )
+    {
+        assert( Entry < nPis );
+        Aig_InfoSetBit( pBuffer, Entry );
+    }
+    return pBuffer;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Add to char-bases support representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManSuppCharAdd( unsigned * pBuffer, Vec_Int_t * vOne, int nPis )
+{
+    int i, Entry;
+    Vec_IntForEachEntry( vOne, Entry, i )
+    {
+        assert( Entry < nPis );
+        Aig_InfoSetBit( pBuffer, Entry );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find the common variables using char-bases support representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManSuppCharCommon( unsigned * pBuffer, Vec_Int_t * vOne )
+{
+    int i, Entry, nCommon = 0;
+    Vec_IntForEachEntry( vOne, Entry, i )
+        nCommon += Aig_InfoHasBit(pBuffer, Entry);
+    return nCommon;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find the best partition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManPartitionSmartFindPart( Vec_Ptr_t * vPartSuppsAll, Vec_Ptr_t * vPartsAll, Vec_Ptr_t * vPartSuppsBit, int nSuppSizeLimit, Vec_Int_t * vOne )
+{
+    Vec_Int_t * vPartSupp;//, * vPart;
+    int Attract, Repulse, Value, ValueBest;
+    int i, nCommon, iBest;
+    iBest = -1;
+    ValueBest = 0;
+    Vec_PtrForEachEntry( vPartSuppsAll, vPartSupp, i )
+    {
+//        vPart = Vec_PtrEntry( vPartsAll, i );
+//        if ( nSuppSizeLimit > 0 && Vec_IntSize(vPart) >= nSuppSizeLimit )
+//            continue;
+//        nCommon = Vec_IntTwoCountCommon( vPartSupp, vOne );
+        nCommon = Aig_ManSuppCharCommon( Vec_PtrEntry(vPartSuppsBit, i), vOne );
+        if ( nCommon == 0 )
+            continue;
+        if ( nCommon == Vec_IntSize(vOne) )
+            return i;
+        // skip partitions whose size exceeds the limit
+        if ( nSuppSizeLimit > 0 && Vec_IntSize(vPartSupp) >= 2 * nSuppSizeLimit )
+            continue;
+        Attract = 1000 * nCommon / Vec_IntSize(vOne);
+        if ( Vec_IntSize(vPartSupp) < 100 )
+            Repulse = 1;
+        else
+            Repulse = 1+Aig_Base2Log(Vec_IntSize(vPartSupp)-100);
+        Value = Attract/Repulse;
+        if ( ValueBest < Value )
+        {
+            ValueBest = Value;
+            iBest = i;
+        }
+    }
+    if ( ValueBest < 75 )
+        return -1;
+    return iBest;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform the smart partitioning.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManPartitionPrint( Aig_Man_t * p, Vec_Ptr_t * vPartsAll, Vec_Ptr_t * vPartSuppsAll )
+{
+    Vec_Int_t * vOne;
+    int i, nOutputs, Counter;
+
+    Counter = 0;
+    Vec_PtrForEachEntry( vPartSuppsAll, vOne, i )
+    {
+        nOutputs = Vec_IntSize(Vec_PtrEntry(vPartsAll, i));
+        printf( "%d=(%d,%d) ", i, Vec_IntSize(vOne), nOutputs );
+        Counter += nOutputs;
+        if ( i == Vec_PtrSize(vPartsAll) - 1 )
+            break;
+    }
+    assert( Counter == Aig_ManPoNum(p) );
+//    printf( "\nTotal = %d. Outputs = %d.\n", Counter, Aig_ManPoNum(p) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform the smart partitioning.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManPartitionCompact( Vec_Ptr_t * vPartsAll, Vec_Ptr_t * vPartSuppsAll, int nSuppSizeLimit )
+{
+    Vec_Int_t * vOne, * vPart, * vPartSupp, * vTemp;
+    int i, iPart;
+
+    if ( nSuppSizeLimit == 0 )
+        nSuppSizeLimit = 200;
+
+    // pack smaller partitions into larger blocks
+    iPart = 0;
+    vPart = vPartSupp = NULL;
+    Vec_PtrForEachEntry( vPartSuppsAll, vOne, i )
+    {
+        if ( Vec_IntSize(vOne) < nSuppSizeLimit )
+        {
+            if ( vPartSupp == NULL )
+            {
+                assert( vPart == NULL );
+                vPartSupp = Vec_IntDup(vOne);
+                vPart = Vec_PtrEntry(vPartsAll, i);
+            }
+            else
+            {
+                vPartSupp = Vec_IntTwoMerge( vTemp = vPartSupp, vOne );
+                Vec_IntFree( vTemp );
+                vPart = Vec_IntTwoMerge( vTemp = vPart, Vec_PtrEntry(vPartsAll, i) );
+                Vec_IntFree( vTemp );
+                Vec_IntFree( Vec_PtrEntry(vPartsAll, i) );
+            }
+            if ( Vec_IntSize(vPartSupp) < nSuppSizeLimit )
+                continue;
+        }
+        else
+            vPart = Vec_PtrEntry(vPartsAll, i);
+        // add the partition 
+        Vec_PtrWriteEntry( vPartsAll, iPart, vPart );  
+        vPart = NULL;
+        if ( vPartSupp ) 
+        {
+            Vec_IntFree( Vec_PtrEntry(vPartSuppsAll, iPart) );
+            Vec_PtrWriteEntry( vPartSuppsAll, iPart, vPartSupp );  
+            vPartSupp = NULL;
+        }
+        iPart++;
+    }
+    // add the last one
+    if ( vPart )
+    {
+        Vec_PtrWriteEntry( vPartsAll, iPart, vPart );  
+        vPart = NULL;
+
+        assert( vPartSupp != NULL );
+        Vec_IntFree( Vec_PtrEntry(vPartSuppsAll, iPart) );
+        Vec_PtrWriteEntry( vPartSuppsAll, iPart, vPartSupp );  
+        vPartSupp = NULL;
+        iPart++;
+    }
+    Vec_PtrShrink( vPartsAll, iPart );
+    Vec_PtrShrink( vPartsAll, iPart );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform the smart partitioning.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManPartitionSmart( Aig_Man_t * p, int nSuppSizeLimit, int fVerbose, Vec_Ptr_t ** pvPartSupps )
+{
+    Vec_Ptr_t * vPartSuppsBit;
+    Vec_Ptr_t * vSupports, * vPartsAll, * vPartsAll2, * vPartSuppsAll;//, * vPartPtr;
+    Vec_Int_t * vOne, * vPart, * vPartSupp, * vTemp;
+    int i, iPart, iOut, clk;
+
+    // compute the supports for all outputs
+clk = clock();
+    vSupports = Aig_ManSupports( p );
+if ( fVerbose )
+{
+PRT( "Supps", clock() - clk );
+}
+    // start char-based support representation
+    vPartSuppsBit = Vec_PtrAlloc( 1000 );
+
+    // create partitions
+clk = clock();
+    vPartsAll = Vec_PtrAlloc( 256 );
+    vPartSuppsAll = Vec_PtrAlloc( 256 );
+    Vec_PtrForEachEntry( vSupports, vOne, i )
+    {
+        // get the output number
+        iOut = Vec_IntPop(vOne);
+        // find closely matching part
+        iPart = Aig_ManPartitionSmartFindPart( vPartSuppsAll, vPartsAll, vPartSuppsBit, nSuppSizeLimit, vOne );
+        if ( iPart == -1 )
+        {
+            // create new partition
+            vPart = Vec_IntAlloc( 32 );
+            Vec_IntPush( vPart, iOut );
+            // create new partition support
+            vPartSupp = Vec_IntDup( vOne );
+            // add this partition and its support
+            Vec_PtrPush( vPartsAll, vPart );
+            Vec_PtrPush( vPartSuppsAll, vPartSupp );
+
+            Vec_PtrPush( vPartSuppsBit, Aig_ManSuppCharStart(vOne, Aig_ManPiNum(p)) );
+        }
+        else
+        {
+            // add output to this partition
+            vPart = Vec_PtrEntry( vPartsAll, iPart );
+            Vec_IntPush( vPart, iOut );
+            // merge supports
+            vPartSupp = Vec_PtrEntry( vPartSuppsAll, iPart );
+            vPartSupp = Vec_IntTwoMerge( vTemp = vPartSupp, vOne );
+            Vec_IntFree( vTemp );
+            // reinsert new support
+            Vec_PtrWriteEntry( vPartSuppsAll, iPart, vPartSupp );
+
+            Aig_ManSuppCharAdd( Vec_PtrEntry(vPartSuppsBit, iPart), vOne, Aig_ManPiNum(p) );
+        }
+    }
+
+    // stop char-based support representation
+    Vec_PtrForEachEntry( vPartSuppsBit, vTemp, i )
+        free( vTemp );
+    Vec_PtrFree( vPartSuppsBit );
+
+//printf( "\n" );
+if ( fVerbose )
+{
+PRT( "Parts", clock() - clk );
+}
+
+clk = clock();
+    // reorder partitions in the decreasing order of support sizes
+    // remember partition number in each partition support
+    Vec_PtrForEachEntry( vPartSuppsAll, vOne, i )
+        Vec_IntPush( vOne, i );
+    // sort the supports in the decreasing order
+    Vec_VecSort( (Vec_Vec_t *)vPartSuppsAll, 1 );
+    // reproduce partitions
+    vPartsAll2 = Vec_PtrAlloc( 256 );
+    Vec_PtrForEachEntry( vPartSuppsAll, vOne, i )
+        Vec_PtrPush( vPartsAll2, Vec_PtrEntry(vPartsAll, Vec_IntPop(vOne)) );
+    Vec_PtrFree( vPartsAll );
+    vPartsAll = vPartsAll2;
+
+    // compact small partitions
+//    Aig_ManPartitionPrint( p, vPartsAll, vPartSuppsAll );
+    Aig_ManPartitionCompact( vPartsAll, vPartSuppsAll, nSuppSizeLimit );
+    if ( fVerbose )
+//    Aig_ManPartitionPrint( p, vPartsAll, vPartSuppsAll );
+    printf( "Created %d partitions.\n", Vec_PtrSize(vPartsAll) );
+
+if ( fVerbose )
+{
+//PRT( "Comps", clock() - clk );
+}
+
+    // cleanup
+    Vec_VecFree( (Vec_Vec_t *)vSupports );
+    if ( pvPartSupps == NULL )
+        Vec_VecFree( (Vec_Vec_t *)vPartSuppsAll );
+    else
+        *pvPartSupps = vPartSuppsAll;
+/*
+    // converts from intergers to nodes
+    Vec_PtrForEachEntry( vPartsAll, vPart, iPart )
+    {
+        vPartPtr = Vec_PtrAlloc( Vec_IntSize(vPart) );
+        Vec_IntForEachEntry( vPart, iOut, i )
+            Vec_PtrPush( vPartPtr, Aig_ManPo(p, iOut) );
+        Vec_IntFree( vPart );
+        Vec_PtrWriteEntry( vPartsAll, iPart, vPartPtr );
+    }
+*/
+    return vPartsAll;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform the naive partitioning.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManPartitionNaive( Aig_Man_t * p, int nPartSize )
+{
+    Vec_Ptr_t * vParts;
+    Aig_Obj_t * pObj;
+    int nParts, i;
+    nParts = (Aig_ManPoNum(p) / nPartSize) + ((Aig_ManPoNum(p) % nPartSize) > 0);
+    vParts = (Vec_Ptr_t *)Vec_VecStart( nParts );
+    Aig_ManForEachPo( p, pObj, i )
+        Vec_IntPush( Vec_PtrEntry(vParts, i / nPartSize), i );
+    return vParts;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Adds internal nodes in the topological order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ManDupPart_rec( Aig_Man_t * pNew, Aig_Man_t * pOld, Aig_Obj_t * pObj, Vec_Int_t * vSuppMap )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsTravIdCurrent(pOld, pObj) )
+        return pObj->pData;
+    Aig_ObjSetTravIdCurrent(pOld, pObj);
+    if ( Aig_ObjIsPi(pObj) )
+    {
+        assert( Vec_IntSize(vSuppMap) == Aig_ManPiNum(pNew) );
+        Vec_IntPush( vSuppMap, (int)(long)pObj->pNext );
+        return pObj->pData = Aig_ObjCreatePi(pNew);
+    }
+    assert( Aig_ObjIsNode(pObj) );
+    Aig_ManDupPart_rec( pNew, pOld, Aig_ObjFanin0(pObj), vSuppMap );
+    Aig_ManDupPart_rec( pNew, pOld, Aig_ObjFanin1(pObj), vSuppMap );
+    return pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds internal nodes in the topological order.]
+
+  Description [Returns the array of new outputs.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDupPart( Aig_Man_t * pNew, Aig_Man_t * pOld, Vec_Int_t * vPart, Vec_Int_t * vSuppMap, int fInverse )
+{
+    Vec_Ptr_t * vOutsTotal;
+    Aig_Obj_t * pObj;
+    int Entry, i;
+    // create the PIs
+    Aig_ManIncrementTravId( pOld );
+    Aig_ManConst1(pOld)->pData = Aig_ManConst1(pNew);
+    Aig_ObjSetTravIdCurrent( pOld, Aig_ManConst1(pOld) );
+    if ( !fInverse )
+    {
+        Vec_IntForEachEntry( vSuppMap, Entry, i )
+        {
+            pObj = Aig_ManPi( pOld, Entry );
+            pObj->pData = Aig_ManPi( pNew, i );
+            Aig_ObjSetTravIdCurrent( pOld, pObj );
+        }
+    }
+    else
+    {
+        Vec_IntForEachEntry( vSuppMap, Entry, i )
+        {
+            pObj = Aig_ManPi( pOld, i );
+            pObj->pData = Aig_ManPi( pNew, Entry );
+            Aig_ObjSetTravIdCurrent( pOld, pObj );
+        }
+        vSuppMap = NULL; // should not be useful
+    }
+    // create the internal nodes
+    vOutsTotal = Vec_PtrAlloc( Vec_IntSize(vPart) );
+    if ( !fInverse )
+    {
+        Vec_IntForEachEntry( vPart, Entry, i )
+        {
+            pObj = Aig_ManPo( pOld, Entry );
+            Aig_ManDupPart_rec( pNew, pOld, Aig_ObjFanin0(pObj), vSuppMap );
+            Vec_PtrPush( vOutsTotal, Aig_ObjChild0Copy(pObj) );
+        }
+    }
+    else
+    {
+        Aig_ManForEachObj( pOld, pObj, i )
+        {
+            if ( Aig_ObjIsPo(pObj) )
+            {
+                Aig_ManDupPart_rec( pNew, pOld, Aig_ObjFanin0(pObj), vSuppMap );
+                Vec_PtrPush( vOutsTotal, Aig_ObjChild0Copy(pObj) );
+            }
+            else if ( Aig_ObjIsNode(pObj) && pObj->nRefs == 0 )
+                Aig_ManDupPart_rec( pNew, pOld, pObj, vSuppMap );
+            
+        }
+    }
+    return vOutsTotal; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Create partitioned miter of the two AIGs.]
+
+  Description [Assumes that each output in the second AIG cannot have 
+  more supp vars than the same output in the first AIG.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManMiterPartitioned( Aig_Man_t * p1, Aig_Man_t * p2, int nPartSize )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pMiter;
+    Vec_Ptr_t * vMiters, * vNodes1, * vNodes2;
+    Vec_Ptr_t * vParts, * vPartSupps;
+    Vec_Int_t * vPart, * vPartSupp;
+    int i, k;
+    // partition the first manager
+    vParts = Aig_ManPartitionSmart( p1, nPartSize, 0, &vPartSupps );
+    // derive miters
+    vMiters = Vec_PtrAlloc( Vec_PtrSize(vParts) );
+    for ( i = 0; i < Vec_PtrSize(vParts); i++ )
+    {
+        // get partitions and their support
+        vPart     = Vec_PtrEntry( vParts, i );
+        vPartSupp = Vec_PtrEntry( vPartSupps, i );
+        // create the new miter
+        pNew = Aig_ManStart( 1000 );
+//        pNew->pName = Extra_UtilStrsav( p1->pName );
+        // create the PIs
+        for ( k = 0; k < Vec_IntSize(vPartSupp); k++ )
+            Aig_ObjCreatePi( pNew );
+        // copy the components
+        vNodes1 = Aig_ManDupPart( pNew, p1, vPart, vPartSupp, 0 );
+        vNodes2 = Aig_ManDupPart( pNew, p2, vPart, vPartSupp, 0 );
+        // create the miter
+        pMiter = Aig_MiterTwo( pNew, vNodes1, vNodes2 );
+        Vec_PtrFree( vNodes1 );
+        Vec_PtrFree( vNodes2 );
+        // create the output
+        Aig_ObjCreatePo( pNew, pMiter );
+        // clean up
+        Aig_ManCleanup( pNew );
+        Vec_PtrPush( vMiters, pNew );
+    }
+    Vec_VecFree( (Vec_Vec_t *)vParts );
+    Vec_VecFree( (Vec_Vec_t *)vPartSupps );
+    return vMiters;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs partitioned choice computation.]
+
+  Description [Assumes that each output in the second AIG cannot have 
+  more supp vars than the same output in the first AIG.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManChoicePartitioned( Vec_Ptr_t * vAigs, int nPartSize )
+{
+    extern int Cmd_CommandExecute( void * pAbc, char * sCommand );
+    extern void * Abc_FrameGetGlobalFrame();
+    extern Aig_Man_t * Fra_FraigChoice( Aig_Man_t * pManAig, int nConfMax );
+
+    Vec_Ptr_t * vOutsTotal, * vOuts;
+    Aig_Man_t * pAigTotal, * pAigPart, * pAig;
+    Vec_Int_t * vPart, * vPartSupp;
+    Vec_Ptr_t * vParts;
+    Aig_Obj_t * pObj;
+    void ** ppData;
+    int i, k, m;
+
+    // partition the first AIG in the array
+    assert( Vec_PtrSize(vAigs) > 1 );
+    pAig = Vec_PtrEntry( vAigs, 0 );
+    vParts = Aig_ManPartitionSmart( pAig, nPartSize, 0, NULL );
+
+    // start the total fraiged AIG
+    pAigTotal = Aig_ManStartFrom( pAig );
+    Aig_ManReprStart( pAigTotal, Vec_PtrSize(vAigs) * Aig_ManObjNumMax(pAig) + 10000 );
+    vOutsTotal = Vec_PtrStart( Aig_ManPoNum(pAig) );
+
+    // set the PI numbers
+    Vec_PtrForEachEntry( vAigs, pAig, i )
+        Aig_ManForEachPi( pAig, pObj, k )
+            pObj->pNext = (Aig_Obj_t *)(long)k;
+
+    Cmd_CommandExecute( Abc_FrameGetGlobalFrame(), "unset progressbar" );
+
+    // create the total fraiged AIG
+    vPartSupp = Vec_IntAlloc( 100 ); // maps part PI num into total PI num
+    Vec_PtrForEachEntry( vParts, vPart, i )
+    {
+        // derive the partition AIG
+        pAigPart = Aig_ManStart( 5000 );
+//        pAigPart->pName = Extra_UtilStrsav( pAigPart->pName );
+        Vec_IntClear( vPartSupp );
+        Vec_PtrForEachEntry( vAigs, pAig, k )
+        {
+            vOuts = Aig_ManDupPart( pAigPart, pAig, vPart, vPartSupp, 0 );
+            if ( k == 0 )
+            {
+                Vec_PtrForEachEntry( vOuts, pObj, m )
+                    Aig_ObjCreatePo( pAigPart, pObj );
+            }
+            Vec_PtrFree( vOuts );
+        }
+        // derive the total AIG from the partitioned AIG
+        vOuts = Aig_ManDupPart( pAigTotal, pAigPart, vPart, vPartSupp, 1 );
+        // add to the outputs
+        Vec_PtrForEachEntry( vOuts, pObj, k )
+        {
+            assert( Vec_PtrEntry( vOutsTotal, Vec_IntEntry(vPart,k) ) == NULL );
+            Vec_PtrWriteEntry( vOutsTotal, Vec_IntEntry(vPart,k), pObj );
+        }
+        Vec_PtrFree( vOuts );
+        // store contents of pData pointers
+        ppData = ALLOC( void *, Aig_ManObjNumMax(pAigPart) );
+        Aig_ManForEachObj( pAigPart, pObj, k )
+            ppData[k] = pObj->pData;
+        // report the process
+        printf( "Part %4d  (out of %4d)  PI = %5d. PO = %5d. And = %6d. Lev = %4d.\r", 
+            i+1, Vec_PtrSize(vParts), Aig_ManPiNum(pAigPart), Aig_ManPoNum(pAigPart), 
+            Aig_ManNodeNum(pAigPart), Aig_ManLevelNum(pAigPart) );
+        // compute equivalence classes (to be stored in pNew->pReprs)
+        pAig = Fra_FraigChoice( pAigPart, 1000 );
+        Aig_ManStop( pAig );
+        // reset the pData pointers
+        Aig_ManForEachObj( pAigPart, pObj, k )
+            pObj->pData = ppData[k];
+        free( ppData );
+        // transfer representatives to the total AIG
+        if ( pAigPart->pReprs )
+            Aig_ManTransferRepr( pAigTotal, pAigPart );
+        Aig_ManStop( pAigPart );
+    }
+    printf( "                                                                                          \r" );
+    Vec_VecFree( (Vec_Vec_t *)vParts );
+    Vec_IntFree( vPartSupp );
+
+    Cmd_CommandExecute( Abc_FrameGetGlobalFrame(), "set progressbar" );
+
+    // clear the PI numbers
+    Vec_PtrForEachEntry( vAigs, pAig, i )
+        Aig_ManForEachPi( pAig, pObj, k )
+            pObj->pNext = NULL;
+/*
+    // collect the missing outputs (outputs whose driver is not a node)
+    pAig = Vec_PtrEntry( vAigs, 0 );
+    Aig_ManConst1(pAig)->pData = Aig_ManConst1(pAigTotal);
+    Aig_ManForEachPi( pAig, pObj, i )
+        pAig->pData = Aig_ManPi( pAigTotal, i );
+    Aig_ManForEachPo( pAig, pObj, i )
+        if ( !Aig_ObjIsNode(Aig_ObjFanin0(pObj)) )
+        {
+            assert( Vec_PtrEntry( vOutsTotal, i ) == NULL );
+            Vec_PtrWriteEntry( vOutsTotal, i, Aig_ObjChild0Copy(pObj) );
+        }
+*/
+    // add the outputs in the same order
+    Vec_PtrForEachEntry( vOutsTotal, pObj, i )
+        Aig_ObjCreatePo( pAigTotal, pObj );
+    Vec_PtrFree( vOutsTotal );
+
+    // derive the result of choicing
+    pAig = Aig_ManRehash( pAigTotal );
+    // create the equivalent nodes lists
+    Aig_ManMarkValidChoices( pAig );
+    return pAig;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigRepr.c b/abc70930/src/aig/aig/aigRepr.c
new file mode 100644
index 00000000..5ee6c9af
--- /dev/null
+++ b/abc70930/src/aig/aig/aigRepr.c
@@ -0,0 +1,457 @@
+/**CFile****************************************************************
+
+  FileName    [aigRepr.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Handing node representatives.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigRepr.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the array of representatives.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManReprStart( Aig_Man_t * p, int nIdMax )
+{
+    assert( Aig_ManBufNum(p) == 0 );
+    assert( p->pReprs == NULL );
+    p->nReprsAlloc = nIdMax;
+    p->pReprs = ALLOC( Aig_Obj_t *, p->nReprsAlloc );
+    memset( p->pReprs, 0, sizeof(Aig_Obj_t *) * p->nReprsAlloc );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stop the array of representatives.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManReprStop( Aig_Man_t * p )
+{
+    assert( p->pReprs != NULL );
+    FREE( p->pReprs );
+    p->nReprsAlloc = 0;    
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Set the representative.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCreateRepr( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 )
+{
+    assert( p->pReprs != NULL );
+    assert( !Aig_IsComplement(pNode1) );
+    assert( !Aig_IsComplement(pNode2) );
+    assert( pNode1->Id < p->nReprsAlloc );
+    assert( pNode2->Id < p->nReprsAlloc );
+    assert( pNode1->Id < pNode2->Id );
+    p->pReprs[pNode2->Id] = pNode1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Set the representative.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Aig_ObjSetRepr( Aig_Man_t * p, Aig_Obj_t * pNode1, Aig_Obj_t * pNode2 )
+{
+    assert( p->pReprs != NULL );
+    assert( !Aig_IsComplement(pNode1) );
+    assert( !Aig_IsComplement(pNode2) );
+    assert( pNode1->Id < p->nReprsAlloc );
+    assert( pNode2->Id < p->nReprsAlloc );
+    if ( pNode1 == pNode2 )
+        return;
+    if ( pNode1->Id < pNode2->Id )
+        p->pReprs[pNode2->Id] = pNode1;
+    else
+        p->pReprs[pNode1->Id] = pNode2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find representative.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Aig_Obj_t * Aig_ObjFindRepr( Aig_Man_t * p, Aig_Obj_t * pNode )
+{
+    assert( p->pReprs != NULL );
+    assert( !Aig_IsComplement(pNode) );
+    assert( pNode->Id < p->nReprsAlloc );
+//    assert( !p->pReprs[pNode->Id] || p->pReprs[pNode->Id]->Id < pNode->Id );
+    return p->pReprs[pNode->Id];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Clears the representative.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Aig_ObjClearRepr( Aig_Man_t * p, Aig_Obj_t * pNode )
+{
+    assert( p->pReprs != NULL );
+    assert( !Aig_IsComplement(pNode) );
+    assert( pNode->Id < p->nReprsAlloc );
+    p->pReprs[pNode->Id] = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find representative transitively.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Aig_Obj_t * Aig_ObjFindReprTransitive( Aig_Man_t * p, Aig_Obj_t * pNode )
+{
+    Aig_Obj_t * pNext, * pRepr;
+    if ( (pRepr = Aig_ObjFindRepr(p, pNode)) )
+        while ( (pNext = Aig_ObjFindRepr(p, pRepr)) )
+            pRepr = pNext;
+    return pRepr;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns representatives of fanin in approapriate polarity.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Aig_Obj_t * Aig_ObjRepr( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pRepr;
+    if ( (pRepr = Aig_ObjFindRepr(p, pObj)) )
+        return Aig_NotCond( pRepr->pData, pObj->fPhase ^ pRepr->fPhase );
+    return pObj->pData;
+}
+static inline Aig_Obj_t * Aig_ObjChild0Repr( Aig_Man_t * p, Aig_Obj_t * pObj ) { return Aig_NotCond( Aig_ObjRepr(p, Aig_ObjFanin0(pObj)), Aig_ObjFaninC0(pObj) ); }
+static inline Aig_Obj_t * Aig_ObjChild1Repr( Aig_Man_t * p, Aig_Obj_t * pObj ) { return Aig_NotCond( Aig_ObjRepr(p, Aig_ObjFanin1(pObj)), Aig_ObjFaninC1(pObj) ); }
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates AIG while substituting representatives.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManTransferRepr( Aig_Man_t * pNew, Aig_Man_t * pOld )
+{
+    Aig_Obj_t * pObj, * pRepr;
+    int k;
+    assert( pNew->pReprs != NULL );
+    // extend storage to fix pNew
+    if ( pNew->nReprsAlloc < Aig_ManObjNumMax(pNew) )
+    {
+        int nReprsAllocNew = 2 * Aig_ManObjNumMax(pNew);
+        pNew->pReprs = REALLOC( Aig_Obj_t *, pNew->pReprs, nReprsAllocNew );
+        memset( pNew->pReprs + pNew->nReprsAlloc, 0, sizeof(Aig_Obj_t *) * (nReprsAllocNew-pNew->nReprsAlloc) );
+        pNew->nReprsAlloc = nReprsAllocNew;
+    }
+    // go through the nodes which have representatives
+    Aig_ManForEachObj( pOld, pObj, k )
+        if ( (pRepr = Aig_ObjFindRepr(pOld, pObj)) )
+            Aig_ObjSetRepr( pNew, Aig_Regular(pRepr->pData), Aig_Regular(pObj->pData) ); 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager recursively.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ManDupRepr_rec( Aig_Man_t * pNew, Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pRepr;
+    if ( pObj->pData )
+        return pObj->pData;
+    if ( (pRepr = Aig_ObjFindRepr(p, pObj)) )
+    {
+        Aig_ManDupRepr_rec( pNew, p, pRepr );
+        return pObj->pData = Aig_NotCond( pRepr->pData, pRepr->fPhase ^ pObj->fPhase );
+    }
+    Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin0(pObj) );
+    Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin1(pObj) );
+    return pObj->pData = Aig_And( pNew, Aig_ObjChild0Repr(p, pObj), Aig_ObjChild1Repr(p, pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates AIG while substituting representatives.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManDupRepr( Aig_Man_t * p, int fOrdered )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj;
+    int i;
+    // start the HOP package
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    pNew->nRegs = p->nRegs;
+    if ( p->vFlopNums )
+        pNew->vFlopNums = Vec_IntDup( p->vFlopNums );
+    // map the const and primary inputs
+    Aig_ManCleanData( p );
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    // map the internal nodes
+    if ( fOrdered )
+    {
+        Aig_ManForEachNode( p, pObj, i )
+            pObj->pData = Aig_And( pNew, Aig_ObjChild0Repr(p, pObj), Aig_ObjChild1Repr(p, pObj) );
+    }
+    else
+    {
+        Aig_ManForEachPo( p, pObj, i )
+            Aig_ManDupRepr_rec( pNew, p, Aig_ObjFanin0(pObj) );
+    }
+    // transfer the POs
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ObjCreatePo( pNew, Aig_ObjChild0Repr(p, pObj) );
+    // check the new manager
+    if ( !Aig_ManCheck(pNew) )
+        printf( "Aig_ManDupRepr: Check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfer representatives and return the number of critical fanouts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManRemapRepr( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pRepr;
+    int i, nFanouts = 0;
+    Aig_ManForEachNode( p, pObj, i )
+    {
+        pRepr = Aig_ObjFindReprTransitive( p, pObj );
+        if ( pRepr == NULL )
+            continue;
+        assert( pRepr->Id < pObj->Id );
+        Aig_ObjSetRepr( p, pObj, pRepr );
+        nFanouts += (pObj->nRefs > 0);
+    }
+    return nFanouts;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjCheckTfi_rec( Aig_Man_t * p, Aig_Obj_t * pNode, Aig_Obj_t * pOld )
+{
+    // check the trivial cases
+    if ( pNode == NULL )
+        return 0;
+//    if ( pNode->Id < pOld->Id ) // cannot use because of choices of pNode
+//        return 0;
+    if ( pNode == pOld )
+        return 1;
+    // skip the visited node
+    if ( Aig_ObjIsTravIdCurrent( p, pNode ) )
+        return 0;
+    Aig_ObjSetTravIdCurrent( p, pNode );
+    // check the children
+    if ( Aig_ObjCheckTfi_rec( p, Aig_ObjFanin0(pNode), pOld ) )
+        return 1;
+    if ( Aig_ObjCheckTfi_rec( p, Aig_ObjFanin1(pNode), pOld ) )
+        return 1;
+    // check equivalent nodes
+    return Aig_ObjCheckTfi_rec( p, p->pEquivs[pNode->Id], pOld );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pOld is in the TFI of pNew.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjCheckTfi( Aig_Man_t * p, Aig_Obj_t * pNew, Aig_Obj_t * pOld )
+{
+    assert( !Aig_IsComplement(pNew) );
+    assert( !Aig_IsComplement(pOld) );
+    Aig_ManIncrementTravId( p );
+    return Aig_ObjCheckTfi_rec( p, pNew, pOld );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Iteratively rehashes the AIG.]
+
+  Description [The input AIG is assumed to have representatives assigned.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManRehash( Aig_Man_t * p )
+{
+    Aig_Man_t * pTemp;
+    int i, nFanouts;
+    assert( p->pReprs != NULL );
+    for ( i = 0; (nFanouts = Aig_ManRemapRepr( p )); i++ )
+    {
+//        printf( "Iter = %3d. Fanouts = %6d. Nodes = %7d.\n", i+1, nFanouts, Aig_ManNodeNum(p) );
+        p = Aig_ManDupRepr( pTemp = p, 1 );
+        Aig_ManReprStart( p, Aig_ManObjNumMax(p) );
+        Aig_ManTransferRepr( p, pTemp );
+        Aig_ManStop( pTemp );
+    }
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Marks the nodes that are Creates choices.]
+
+  Description [The input AIG is assumed to have representatives assigned.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManMarkValidChoices( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pRepr;
+    int i;
+    assert( p->pReprs != NULL );
+    // create equivalent nodes in the manager
+    assert( p->pEquivs == NULL );
+    p->pEquivs = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(p) );
+    memset( p->pEquivs, 0, sizeof(Aig_Obj_t *) * Aig_ManObjNumMax(p) );
+    // make the choice nodes
+    Aig_ManForEachNode( p, pObj, i )
+    {
+        pRepr = Aig_ObjFindRepr( p, pObj );
+        if ( pRepr == NULL )
+            continue;
+        assert( pObj->nRefs == 0 );
+        // skip constant and PI classes
+        if ( !Aig_ObjIsNode(pRepr) )
+        {
+            Aig_ObjClearRepr( p, pObj );
+            continue;
+        }
+        // skip choices with combinatinal loops
+        if ( Aig_ObjCheckTfi( p, pObj, pRepr ) )
+        {
+            Aig_ObjClearRepr( p, pObj );
+            continue;
+        }
+//printf( "Node %d is represented by node %d.\n", pObj->Id, pRepr->Id );
+        // add choice to the choice node
+        p->pEquivs[pObj->Id] = p->pEquivs[pRepr->Id];
+        p->pEquivs[pRepr->Id] = pObj;
+    }
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigRet.c b/abc70930/src/aig/aig/aigRet.c
new file mode 100644
index 00000000..d1784b1b
--- /dev/null
+++ b/abc70930/src/aig/aig/aigRet.c
@@ -0,0 +1,969 @@
+/**CFile****************************************************************
+
+  FileName    [aigRet.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Retiming of AIGs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigRet.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// init values
+typedef enum { 
+    RTM_VAL_NONE,                    // 0: non-existent value
+    RTM_VAL_ZERO,                    // 1: initial value 0
+    RTM_VAL_ONE,                     // 2: initial value 1
+    RTM_VAL_VOID                     // 3: unused value
+} Rtm_Init_t;
+
+typedef struct Rtm_Man_t_    Rtm_Man_t;
+struct Rtm_Man_t_
+{
+    // network representation
+    Vec_Ptr_t *      vObjs;          // retiming objects
+    Vec_Ptr_t *      vPis;           // PIs only
+    Vec_Ptr_t *      vPos;           // POs only
+    Aig_MmFlex_t *   pMem;           // the memory manager
+    // autonomous components after cutting off
+    // storage for overflow latches
+    unsigned *       pExtra;   
+    int              nExtraCur;
+    int              nExtraAlloc;
+};
+
+typedef struct Rtm_Edg_t_    Rtm_Edg_t;
+struct Rtm_Edg_t_
+{
+    unsigned long    nLats   :  12;  // the number of latches
+    unsigned long    LData   :  20;  // the latches themselves
+};
+
+typedef struct Rtm_Obj_t_    Rtm_Obj_t;
+struct Rtm_Obj_t_
+{
+    void *           pCopy;          // the copy of this object
+    unsigned long    Type    :  3;   // object type
+    unsigned long    fMark   :  1;   // multipurpose mark
+    unsigned long    fAuto   :  1;   // this object belongs to an autonomous component
+    unsigned long    fCompl0 :  1;   // complemented attribute of the first edge
+    unsigned long    fCompl1 :  1;   // complemented attribute of the second edge
+    unsigned long    nFanins :  8;   // the number of fanins
+    unsigned         Num     : 17;   // the retiming number of this node
+    int              Id;             // ID of this object
+    int              Temp;           // temporary usage
+    int              nFanouts;       // the number of fanouts
+    void *           pFanio[0];      // fanins and their edges (followed by fanouts and pointers to their edges)
+};
+
+static inline Rtm_Obj_t * Rtm_ObjFanin( Rtm_Obj_t * pObj, int i )        { return (Rtm_Obj_t *)pObj->pFanio[2*i];                     }
+static inline Rtm_Obj_t * Rtm_ObjFanout( Rtm_Obj_t * pObj, int i )       { return (Rtm_Obj_t *)pObj->pFanio[2*(pObj->nFanins+i)];     }
+static inline Rtm_Edg_t * Rtm_ObjEdge( Rtm_Obj_t * pObj, int i )         { return (Rtm_Edg_t *)(pObj->pFanio + 2*i + 1);              }
+static inline Rtm_Edg_t * Rtm_ObjFanoutEdge( Rtm_Obj_t * pObj, int i )   { return (Rtm_Edg_t *)pObj->pFanio[2*(pObj->nFanins+i) + 1]; }
+
+static inline Rtm_Init_t  Rtm_InitNot( Rtm_Init_t Val )                  { if ( Val == RTM_VAL_ZERO ) return RTM_VAL_ONE; if ( Val == RTM_VAL_ONE ) return RTM_VAL_ZERO; assert( 0 ); return -1; }
+static inline Rtm_Init_t  Rtm_InitNotCond( Rtm_Init_t Val, int c )       { return c ? Rtm_InitNot(Val) : Val;                         }
+static inline Rtm_Init_t  Rtm_InitAnd(Rtm_Init_t ValA, Rtm_Init_t ValB ) { if ( ValA == RTM_VAL_ONE && ValB == RTM_VAL_ONE ) return RTM_VAL_ONE;  if ( ValA == RTM_VAL_ZERO || ValB == RTM_VAL_ZERO ) return RTM_VAL_ZERO; assert( 0 ); return -1;   }
+
+static inline int         Rtm_InitWordsNum( int nLats )                  { return (nLats >> 4) + ((nLats & 15) > 0); }
+static inline int         Rtm_InitGetTwo( unsigned * p, int i )          { return (p[i>>4] >> ((i & 15)<<1)) & 3;    }
+static inline void        Rtm_InitSetTwo( unsigned * p, int i, int val ) { p[i>>4] |= (val << ((i & 15)<<1));        }
+static inline void        Rtm_InitXorTwo( unsigned * p, int i, int val ) { p[i>>4] ^= (val << ((i & 15)<<1));        }
+
+static inline Rtm_Init_t  Rtm_ObjGetFirst1( Rtm_Edg_t * pEdge )          { return pEdge->LData & 3;                                    }
+static inline Rtm_Init_t  Rtm_ObjGetLast1( Rtm_Edg_t * pEdge )           { return (pEdge->LData >> ((pEdge->nLats-1)<<1)) & 3;         }
+static inline Rtm_Init_t  Rtm_ObjGetOne1( Rtm_Edg_t * pEdge, int i )     { assert( i < (int)pEdge->nLats ); return (pEdge->LData >> (i << 1)) & 3;  }
+static inline Rtm_Init_t  Rtm_ObjRemFirst1( Rtm_Edg_t * pEdge )          { int Val = pEdge->LData & 3; pEdge->LData >>= 2; assert(pEdge->nLats > 0); pEdge->nLats--; return Val;  }
+static inline Rtm_Init_t  Rtm_ObjRemLast1( Rtm_Edg_t * pEdge )           { int Val = (pEdge->LData >> ((pEdge->nLats-1)<<1)) & 3; pEdge->LData ^= Val << ((pEdge->nLats-1)<<1); assert(pEdge->nLats > 0); pEdge->nLats--; return Val;  }
+static inline void        Rtm_ObjAddFirst1( Rtm_Edg_t * pEdge, Rtm_Init_t Val ) { assert( Val > 0 && Val < 4 ); pEdge->LData = (pEdge->LData << 2) | Val;  pEdge->nLats++;   }
+static inline void        Rtm_ObjAddLast1( Rtm_Edg_t * pEdge, Rtm_Init_t Val )  { assert( Val > 0 && Val < 4 ); pEdge->LData |= Val << (pEdge->nLats<<1);  pEdge->nLats++;   }
+
+static inline Rtm_Init_t  Rtm_ObjGetFirst2( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                 { return Rtm_InitGetTwo( p->pExtra + pEdge->LData, 0 );                }
+static inline Rtm_Init_t  Rtm_ObjGetLast2( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                  { return Rtm_InitGetTwo( p->pExtra + pEdge->LData, pEdge->nLats - 1 ); }
+static inline Rtm_Init_t  Rtm_ObjGetOne2( Rtm_Man_t * p, Rtm_Edg_t * pEdge, int i )            { return Rtm_InitGetTwo( p->pExtra + pEdge->LData, i );                }
+static        Rtm_Init_t  Rtm_ObjRemFirst2( Rtm_Man_t * p, Rtm_Edg_t * pEdge );
+static inline Rtm_Init_t  Rtm_ObjRemLast2( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                  { Rtm_Init_t Val = Rtm_ObjGetLast2( p, pEdge );    Rtm_InitXorTwo( p->pExtra + pEdge->LData, pEdge->nLats - 1, Val ); pEdge->nLats--; return Val; }
+static        void        Rtm_ObjAddFirst2( Rtm_Man_t * p, Rtm_Edg_t * pEdge, Rtm_Init_t Val );
+static inline void        Rtm_ObjAddLast2( Rtm_Man_t * p, Rtm_Edg_t * pEdge, Rtm_Init_t Val )  { Rtm_InitSetTwo( p->pExtra + pEdge->LData, pEdge->nLats, Val );  pEdge->nLats++;  }
+
+static        void        Rtm_ObjTransferToSmall( Rtm_Man_t * p, Rtm_Edg_t * pEdge );
+static        void        Rtm_ObjTransferToBig( Rtm_Man_t * p, Rtm_Edg_t * pEdge ); 
+static        void        Rtm_ObjTransferToBigger( Rtm_Man_t * p, Rtm_Edg_t * pEdge );
+
+static inline Rtm_Init_t  Rtm_ObjGetFirst( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                  { return pEdge->nLats > 10? Rtm_ObjGetFirst2(p, pEdge)  : Rtm_ObjGetFirst1(pEdge);   }
+static inline Rtm_Init_t  Rtm_ObjGetLast( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                   { return pEdge->nLats > 10? Rtm_ObjGetLast2(p, pEdge)   : Rtm_ObjGetLast1(pEdge);    }
+static inline Rtm_Init_t  Rtm_ObjGetOne( Rtm_Man_t * p, Rtm_Edg_t * pEdge, int i )             { return pEdge->nLats > 10? Rtm_ObjGetOne2(p, pEdge, i) : Rtm_ObjGetOne1(pEdge, i);  }
+static        Rtm_Init_t  Rtm_ObjRemFirst( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                  { Rtm_Init_t Res = pEdge->nLats > 10 ? Rtm_ObjRemFirst2(p, pEdge) : Rtm_ObjRemFirst1(pEdge); if ( pEdge->nLats == 10 ) Rtm_ObjTransferToSmall(p, pEdge); return Res; }
+static        Rtm_Init_t  Rtm_ObjRemLast( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                   { Rtm_Init_t Res = pEdge->nLats > 10 ? Rtm_ObjRemLast2(p, pEdge)  : Rtm_ObjRemLast1(pEdge);  if ( pEdge->nLats == 10 ) Rtm_ObjTransferToSmall(p, pEdge); return Res; }
+static        void        Rtm_ObjAddFirst( Rtm_Man_t * p, Rtm_Edg_t * pEdge, Rtm_Init_t Val )  { if ( pEdge->nLats == 10 ) Rtm_ObjTransferToBig(p, pEdge); else if ( (pEdge->nLats & 15) == 15 ) Rtm_ObjTransferToBigger(p, pEdge); if ( pEdge->nLats >= 10 ) Rtm_ObjAddFirst2(p, pEdge, Val); else Rtm_ObjAddFirst1(pEdge, Val); }
+static        void        Rtm_ObjAddLast( Rtm_Man_t * p, Rtm_Edg_t * pEdge, Rtm_Init_t Val )   { if ( pEdge->nLats == 10 ) Rtm_ObjTransferToBig(p, pEdge); else if ( (pEdge->nLats & 15) == 15 ) Rtm_ObjTransferToBigger(p, pEdge); if ( pEdge->nLats >= 10 ) Rtm_ObjAddLast2(p, pEdge, Val);  else Rtm_ObjAddLast1(pEdge, Val);  }
+
+
+// iterator over the primary inputs
+#define Rtm_ManForEachPi( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPis, pObj, i )
+// iterator over the primary outputs
+#define Rtm_ManForEachPo( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPos, pObj, i )
+// iterator over all objects, including those currently not used
+#define Rtm_ManForEachObj( p, pObj, i )                                         \
+    Vec_PtrForEachEntry( p->vObjs, pObj, i ) 
+// iterate through the fanins
+#define Rtm_ObjForEachFanin( pObj, pFanin, i )                                  \
+    for ( i = 0; i < (int)(pObj)->nFanins && ((pFanin = Rtm_ObjFanin(pObj, i)), 1); i++ )
+// iterate through the fanouts
+#define Rtm_ObjForEachFanout( pObj, pFanout, i )                                \
+    for ( i = 0; i < (int)(pObj)->nFanouts && ((pFanout = Rtm_ObjFanout(pObj, i)), 1); i++ )
+// iterate through the fanin edges
+#define Rtm_ObjForEachFaninEdge( pObj, pEdge, i )                               \
+    for ( i = 0; i < (int)(pObj)->nFanins && ((pEdge = Rtm_ObjEdge(pObj, i)), 1); i++ )
+// iterate through the fanout edges
+#define Rtm_ObjForEachFanoutEdge( pObj, pEdge, i )                              \
+    for ( i = 0; i < (int)(pObj)->nFanouts && ((pEdge = Rtm_ObjFanoutEdge(pObj, i)), 1); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers from big to small storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjTransferToSmall( Rtm_Man_t * p, Rtm_Edg_t * pEdge ) 
+{
+    assert( pEdge->nLats == 10 );
+    pEdge->LData = p->pExtra[pEdge->LData];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers from small to big storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjTransferToBig( Rtm_Man_t * p, Rtm_Edg_t * pEdge ) 
+{
+    assert( pEdge->nLats == 10 );
+    if ( p->nExtraCur + 1 > p->nExtraAlloc )
+    {
+        int nExtraAllocNew = AIG_MAX( 2 * p->nExtraAlloc, 1024 );
+        p->pExtra = REALLOC( unsigned, p->pExtra, nExtraAllocNew );
+        p->nExtraAlloc = nExtraAllocNew;
+    }
+    p->pExtra[p->nExtraCur] = pEdge->LData;
+    pEdge->LData = p->nExtraCur++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers to bigger storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjTransferToBigger( Rtm_Man_t * p, Rtm_Edg_t * pEdge ) 
+{
+    int nWords;
+    assert( (pEdge->nLats & 15) == 15 );
+    nWords = (pEdge->nLats + 1) >> 4;
+    if ( p->nExtraCur + nWords + 1 > p->nExtraAlloc )
+    {
+        int nExtraAllocNew = AIG_MAX( 2 * p->nExtraAlloc, 1024 );
+        p->pExtra = REALLOC( unsigned, p->pExtra, nExtraAllocNew );
+        p->nExtraAlloc = nExtraAllocNew;
+    }
+    memcpy( p->pExtra + p->nExtraCur, p->pExtra + pEdge->LData, sizeof(unsigned) * nWords );
+    p->pExtra[p->nExtraCur + nWords] = 0;
+    pEdge->LData = p->nExtraCur;
+    p->nExtraCur += nWords + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rtm_Init_t  Rtm_ObjRemFirst2( Rtm_Man_t * p, Rtm_Edg_t * pEdge )                 
+{ 
+    Rtm_Init_t Val = 0, Temp;   
+    unsigned * pB = p->pExtra + pEdge->LData, * pE = pB + Rtm_InitWordsNum( pEdge->nLats-- ) - 1;  
+    while ( pE >= pB ) 
+    {
+        Temp = *pE & 3;
+        *pE = (*pE >> 2) | (Val << 30);
+        Val = Temp;
+        pE--;
+    }
+    assert( Val != 0 );
+    return Val;  
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjAddFirst2( Rtm_Man_t * p, Rtm_Edg_t * pEdge, Rtm_Init_t Val ) 
+{
+    unsigned * pB = p->pExtra + pEdge->LData, * pE = pB + Rtm_InitWordsNum( ++pEdge->nLats ); 
+    Rtm_Init_t Temp;
+    assert( Val != 0 );
+    while ( pB < pE ) 
+    {
+        Temp = *pB >> 30;
+        *pB = (*pB << 2) | Val;
+        Val = Temp;
+        pB++;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_PrintEdge( Rtm_Man_t * p, Rtm_Edg_t * pEdge ) 
+{
+//    unsigned LData = pEdge->LData;
+    printf( "%d : ", pEdge->nLats );
+/*
+    if ( pEdge->nLats > 10 )
+        Extra_PrintBinary( stdout, p->pExtra + pEdge->LData, 2*(pEdge->nLats+1) );
+    else
+        Extra_PrintBinary( stdout, &LData, 2*(pEdge->nLats+1) );
+*/
+    printf( "\n" );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the retiming manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rtm_Man_t * Rtm_ManAlloc( Aig_Man_t * p )
+{
+    Rtm_Man_t * pRtm;
+    // start the manager
+    pRtm = ALLOC( Rtm_Man_t, 1 );
+    memset( pRtm, 0, sizeof(Rtm_Man_t) );
+    // perform initializations
+    pRtm->vObjs = Vec_PtrAlloc( Aig_ManObjNum(p) );
+    pRtm->vPis  = Vec_PtrAlloc( Aig_ManPiNum(p) );
+    pRtm->vPos  = Vec_PtrAlloc( Aig_ManPoNum(p) );
+    pRtm->pMem  = Aig_MmFlexStart();
+    return pRtm;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the retiming manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ManFree( Rtm_Man_t * p )
+{
+    Vec_PtrFree( p->vObjs );
+    Vec_PtrFree( p->vPis );
+    Vec_PtrFree( p->vPos );
+    Aig_MmFlexStop( p->pMem, 0 );
+    FREE( p->pExtra );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the maximum number of latches on an edge.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ManLatchMax( Rtm_Man_t * p )
+{
+    Rtm_Obj_t * pObj;
+    Rtm_Edg_t * pEdge;
+    int nLatchMax = 0, i, k;//, c, Val;
+    Rtm_ManForEachObj( p, pObj, i )
+    Rtm_ObjForEachFaninEdge( pObj, pEdge, k )
+    {
+/*
+        for ( c = 0; c < (int)pEdge->nLats; c++ )
+        {
+            Val = Rtm_ObjGetOne( p, pEdge, c );
+            assert( Val == 1 || Val == 2 );
+        }
+*/
+        nLatchMax = AIG_MAX( nLatchMax, (int)pEdge->nLats );
+    }
+    return nLatchMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the retiming object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rtm_Obj_t * Rtm_ObjAlloc( Rtm_Man_t * pRtm, int nFanins, int nFanouts )
+{
+    Rtm_Obj_t * pObj;
+    int Size = sizeof(Rtm_Obj_t) + sizeof(Rtm_Obj_t *) * (nFanins + nFanouts) * 2;
+    pObj = (Rtm_Obj_t *)Aig_MmFlexEntryFetch( pRtm->pMem, Size );
+    memset( pObj, 0, sizeof(Rtm_Obj_t) );
+    pObj->Type = (int)(nFanins == 1 && nFanouts == 0); // mark PO
+    pObj->Num  = nFanins;  // temporary
+    pObj->Temp = nFanouts;
+    pObj->Id = Vec_PtrSize(pRtm->vObjs);
+    Vec_PtrPush( pRtm->vObjs, pObj );
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the retiming object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjAddFanin( Rtm_Obj_t * pObj, Rtm_Obj_t * pFanin, int fCompl )
+{
+    pObj->pFanio[ 2*pObj->nFanins ] = pFanin;
+    pObj->pFanio[ 2*pObj->nFanins + 1 ] = NULL;
+    pFanin->pFanio[ 2*(pFanin->Num + pFanin->nFanouts) ] = pObj;
+    pFanin->pFanio[ 2*(pFanin->Num + pFanin->nFanouts) + 1 ] = pObj->pFanio + 2*pObj->nFanins + 1;
+    if ( pObj->nFanins == 0 )
+        pObj->fCompl0 = fCompl;
+    else if ( pObj->nFanins == 1 )
+        pObj->fCompl1 = fCompl;
+    else
+        assert( 0 );
+    pObj->nFanins++;
+    pFanin->nFanouts++;
+    assert( pObj->nFanins <= pObj->Num );
+    assert( pFanin->nFanouts <= pFanin->Temp );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check the possibility of forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ObjCheckRetimeFwd( Rtm_Obj_t * pObj )
+{
+    Rtm_Edg_t * pEdge;
+    int i;
+    Rtm_ObjForEachFaninEdge( pObj, pEdge, i )
+        if ( pEdge->nLats == 0 )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check the possibility of forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ObjCheckRetimeBwd( Rtm_Obj_t * pObj )
+{
+    Rtm_Edg_t * pEdge;
+    int i;
+    Rtm_ObjForEachFanoutEdge( pObj, pEdge, i )
+        if ( pEdge->nLats == 0 )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check the possibility of forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ObjGetDegreeFwd( Rtm_Obj_t * pObj )
+{
+    Rtm_Obj_t * pFanin;
+    int i, Degree = 0;
+    Rtm_ObjForEachFanin( pObj, pFanin, i )
+        Degree = AIG_MAX( Degree, (int)pFanin->Num );
+    return Degree + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check the possibility of forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ObjGetDegreeBwd( Rtm_Obj_t * pObj )
+{
+    Rtm_Obj_t * pFanout;
+    int i, Degree = 0;
+    Rtm_ObjForEachFanout( pObj, pFanout, i )
+        Degree = AIG_MAX( Degree, (int)pFanout->Num );
+    return Degree + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjRetimeFwd( Rtm_Man_t * pRtm, Rtm_Obj_t * pObj )
+{
+    Rtm_Init_t ValTotal, ValCur;
+    Rtm_Edg_t * pEdge;
+    int i;
+    assert( Rtm_ObjCheckRetimeFwd(pObj) );
+    // extract values and compute the result
+    ValTotal = RTM_VAL_ONE;
+    Rtm_ObjForEachFaninEdge( pObj, pEdge, i )
+    {
+        ValCur = Rtm_ObjRemFirst( pRtm, pEdge );
+        ValCur = Rtm_InitNotCond( ValCur, i? pObj->fCompl1 : pObj->fCompl0 );
+        ValTotal = Rtm_InitAnd( ValTotal, ValCur );
+    }
+    // insert the result in the fanout values
+    Rtm_ObjForEachFanoutEdge( pObj, pEdge, i )
+        Rtm_ObjAddLast( pRtm, pEdge, ValTotal );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs forward retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjRetimeBwd( Rtm_Man_t * pRtm, Rtm_Obj_t * pObj )
+{
+    Rtm_Edg_t * pEdge;
+    int i;
+    assert( Rtm_ObjCheckRetimeBwd(pObj) );
+    // extract values and compute the result
+    Rtm_ObjForEachFanoutEdge( pObj, pEdge, i )
+        Rtm_ObjRemLast( pRtm, pEdge );
+    // insert the result in the fanout values
+    Rtm_ObjForEachFaninEdge( pObj, pEdge, i )
+        Rtm_ObjAddFirst( pRtm, pEdge, RTM_VAL_VOID );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjMarkAutoFwd_rec( Rtm_Obj_t * pObj )
+{
+    Rtm_Obj_t * pFanout;
+    int i;
+    if ( pObj->fAuto )
+        return;
+    pObj->fAuto = 1;
+    Rtm_ObjForEachFanout( pObj, pFanout, i )
+        Rtm_ObjMarkAutoFwd_rec( pFanout );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Marks the nodes unreachable from the PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ManMarkAutoFwd( Rtm_Man_t * pRtm )
+{
+    Rtm_Obj_t * pObjRtm;
+    int i, Counter = 0;
+    // mark nodes reachable from the PIs
+    pObjRtm = Vec_PtrEntry( pRtm->vObjs, 0 );
+    Rtm_ObjMarkAutoFwd_rec( pObjRtm );
+    Rtm_ManForEachPi( pRtm, pObjRtm, i )
+        Rtm_ObjMarkAutoFwd_rec( pObjRtm );
+    // count the number of autonomous nodes
+    Rtm_ManForEachObj( pRtm, pObjRtm, i )
+    {
+        pObjRtm->fAuto = !pObjRtm->fAuto;
+        Counter += pObjRtm->fAuto;
+    }
+    // mark the fanins of the autonomous nodes
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rtm_ObjMarkAutoBwd_rec( Rtm_Obj_t * pObj )
+{
+    Rtm_Obj_t * pFanin;
+    int i;
+    if ( pObj->fAuto )
+        return;
+    pObj->fAuto = 1;
+    Rtm_ObjForEachFanin( pObj, pFanin, i )
+        Rtm_ObjMarkAutoBwd_rec( pFanin );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Marks the nodes unreachable from the POs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rtm_ManMarkAutoBwd( Rtm_Man_t * pRtm )
+{
+    Rtm_Obj_t * pObjRtm;
+    int i, Counter = 0;
+    // mark nodes reachable from the PIs
+    pObjRtm = Vec_PtrEntry( pRtm->vObjs, 0 );
+    pObjRtm->fAuto = 1;
+    Rtm_ManForEachPi( pRtm, pObjRtm, i )
+        pObjRtm->fAuto = 1;
+    Rtm_ManForEachPo( pRtm, pObjRtm, i )
+        Rtm_ObjMarkAutoBwd_rec( pObjRtm );
+    // count the number of autonomous nodes
+    Rtm_ManForEachObj( pRtm, pObjRtm, i )
+    {
+        pObjRtm->fAuto = !pObjRtm->fAuto;
+        Counter += pObjRtm->fAuto;
+    }
+    // mark the fanins of the autonomous nodes
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derive retiming manager from the given AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rtm_Man_t * Rtm_ManFromAig( Aig_Man_t * p )
+{
+    Rtm_Man_t * pRtm;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
+    int i;
+    assert( Aig_ManRegNum(p) > 0 );
+    assert( Aig_ManBufNum(p) == 0 );
+    // allocate the manager
+    pRtm = Rtm_ManAlloc( p );
+    // allocate objects
+    pObj = Aig_ManConst1(p);
+    pObj->pData = Rtm_ObjAlloc( pRtm, 0, pObj->nRefs );
+    Aig_ManForEachPiSeq( p, pObj, i )
+    {
+        pObj->pData = Rtm_ObjAlloc( pRtm, 0, pObj->nRefs );
+        Vec_PtrPush( pRtm->vPis, pObj->pData );
+    }
+    Aig_ManForEachPoSeq( p, pObj, i )
+    {
+        pObj->pData = Rtm_ObjAlloc( pRtm, 1, 0 );
+        Vec_PtrPush( pRtm->vPos, pObj->pData );
+    }
+    Aig_ManForEachLoSeq( p, pObj, i )
+        pObj->pData = Rtm_ObjAlloc( pRtm, 1, pObj->nRefs );
+    Aig_ManForEachLiSeq( p, pObj, i )
+        pObj->pData = Rtm_ObjAlloc( pRtm, 1, 1 );
+    Aig_ManForEachNode( p, pObj, i )
+        pObj->pData = Rtm_ObjAlloc( pRtm, 2, pObj->nRefs );
+    // connect objects
+    Aig_ManForEachPoSeq( p, pObj, i )
+        Rtm_ObjAddFanin( pObj->pData, Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
+    Aig_ManForEachLiSeq( p, pObj, i )
+        Rtm_ObjAddFanin( pObj->pData, Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        Rtm_ObjAddFanin( pObjLo->pData, pObjLi->pData, 0 );
+    Aig_ManForEachNode( p, pObj, i )
+    {
+        Rtm_ObjAddFanin( pObj->pData, Aig_ObjFanin0(pObj)->pData, Aig_ObjFaninC0(pObj) );
+        Rtm_ObjAddFanin( pObj->pData, Aig_ObjFanin1(pObj)->pData, Aig_ObjFaninC1(pObj) );
+    }
+    return pRtm;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derive AIG manager after retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Rtm_ManToAig_rec( Aig_Man_t * pNew, Rtm_Man_t * pRtm, Rtm_Obj_t * pObjRtm, int * pLatches )
+{
+    Rtm_Edg_t * pEdge;
+    Aig_Obj_t * pRes, * pFanin;
+    int k, Val;
+    if ( pObjRtm->pCopy )
+        return pObjRtm->pCopy;
+    // get the inputs
+    pRes = Aig_ManConst1( pNew );
+    Rtm_ObjForEachFaninEdge( pObjRtm, pEdge, k )
+    {
+        if ( pEdge->nLats == 0 )
+            pFanin = Rtm_ManToAig_rec( pNew, pRtm, Rtm_ObjFanin(pObjRtm, k), pLatches );
+        else
+        {
+            Val = Rtm_ObjGetFirst( pRtm, pEdge );
+            pFanin = Aig_ManPi( pNew, pLatches[2*pObjRtm->Id + k] + pEdge->nLats - 1 );
+            pFanin = Aig_NotCond( pFanin, Val == RTM_VAL_ONE );
+        }
+        pFanin = Aig_NotCond( pFanin, k ? pObjRtm->fCompl1 : pObjRtm->fCompl0 );
+        pRes = Aig_And( pNew, pRes, pFanin );
+    }
+    return pObjRtm->pCopy = pRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derive AIG manager after retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Rtm_ManToAig( Rtm_Man_t * pRtm )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObjNew;
+    Rtm_Obj_t * pObjRtm;
+    Rtm_Edg_t * pEdge;
+    int i, k, m, Val, nLatches, * pLatches;
+    // count latches and mark the first latch on each edge
+    pLatches = ALLOC( int, 2 * Vec_PtrSize(pRtm->vObjs) );
+    nLatches = 0;
+    Rtm_ManForEachObj( pRtm, pObjRtm, i )
+    Rtm_ObjForEachFaninEdge( pObjRtm, pEdge, k )
+    {
+        pLatches[2*pObjRtm->Id + k] = Vec_PtrSize(pRtm->vPis) + nLatches;
+        nLatches += pEdge->nLats;
+    }
+    // create the new manager
+    pNew = Aig_ManStart( Vec_PtrSize(pRtm->vObjs) + nLatches );
+    // create PIs/POs and latches
+    pObjRtm = Vec_PtrEntry( pRtm->vObjs, 0 );
+    pObjRtm->pCopy = Aig_ManConst1(pNew);
+    Rtm_ManForEachPi( pRtm, pObjRtm, i )
+        pObjRtm->pCopy = Aig_ObjCreatePi(pNew);
+    for ( i = 0; i < nLatches; i++ )
+        Aig_ObjCreatePi(pNew);
+    // create internal nodes
+    Rtm_ManForEachObj( pRtm, pObjRtm, i )
+        Rtm_ManToAig_rec( pNew, pRtm, pObjRtm, pLatches );
+    // create POs
+    Rtm_ManForEachPo( pRtm, pObjRtm, i )
+        Aig_ObjCreatePo( pNew, pObjRtm->pCopy );
+    // connect latches 
+    Rtm_ManForEachObj( pRtm, pObjRtm, i )
+    Rtm_ObjForEachFaninEdge( pObjRtm, pEdge, k )
+    {
+        if ( pEdge->nLats == 0 )
+            continue;
+        pObjNew = Rtm_ObjFanin( pObjRtm, k )->pCopy;
+        for ( m = 0; m < (int)pEdge->nLats; m++ )
+        {
+            Val = Rtm_ObjGetOne( pRtm, pEdge, pEdge->nLats - 1 - m );
+            assert( Val == RTM_VAL_ZERO || Val == RTM_VAL_ONE || Val == RTM_VAL_VOID );
+            pObjNew = Aig_NotCond( pObjNew, Val == RTM_VAL_ONE );
+            Aig_ObjCreatePo( pNew, pObjNew );
+            pObjNew = Aig_ManPi( pNew, pLatches[2*pObjRtm->Id + k] + m );
+            pObjNew = Aig_NotCond( pObjNew, Val == RTM_VAL_ONE );
+        }
+//        assert( Aig_Regular(pObjNew)->nRefs > 0 );
+    }
+    free( pLatches );
+    pNew->nRegs = nLatches;
+    // remove useless nodes
+    Aig_ManCleanup( pNew );
+    if ( !Aig_ManCheck( pNew ) )
+        printf( "Rtm_ManToAig: The network check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs forward retiming with the given limit on depth.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Rtm_ManRetime( Aig_Man_t * p, int fForward, int nStepsMax, int fVerbose )
+{
+    Vec_Ptr_t * vQueue;
+    Aig_Man_t * pNew;
+    Rtm_Man_t * pRtm;
+    Rtm_Obj_t * pObj, * pNext;
+    Aig_Obj_t * pObjAig;
+    int i, k, nAutos, Degree, DegreeMax = 0; 
+    int clk;
+
+    // create the retiming manager
+clk = clock();
+    pRtm = Rtm_ManFromAig( p );
+    // set registers
+    Aig_ManForEachLoSeq( p, pObjAig, i )
+        Rtm_ObjAddFirst( pRtm, Rtm_ObjEdge(pObjAig->pData, 0), fForward? RTM_VAL_ZERO : RTM_VAL_VOID );
+    // detect and mark the autonomous components
+    if ( fForward )
+        nAutos = Rtm_ManMarkAutoFwd( pRtm );
+    else
+        nAutos = Rtm_ManMarkAutoBwd( pRtm );
+    if ( fVerbose )
+    {
+        printf( "Detected %d autonomous objects. ", nAutos );
+        PRT( "Time", clock() - clk );
+    }
+
+    // set the current retiming number
+    Rtm_ManForEachObj( pRtm, pObj, i )
+    {
+        assert( pObj->nFanins == pObj->Num );
+        assert( pObj->nFanouts == pObj->Temp );
+        pObj->Num = 0;
+    }
+
+clk = clock();
+    // put the LOs on the queue
+    vQueue = Vec_PtrAlloc( 1000 );
+    if ( fForward )
+    {
+        Aig_ManForEachLoSeq( p, pObjAig, i )
+        {
+            pObj = pObjAig->pData;
+            if ( pObj->fAuto )
+                continue;
+            pObj->fMark = 1;
+            Vec_PtrPush( vQueue, pObj );
+        }
+    }
+    else
+    {
+        Aig_ManForEachLiSeq( p, pObjAig, i )
+        {
+            pObj = pObjAig->pData;
+            if ( pObj->fAuto )
+                continue;
+            pObj->fMark = 1;
+            Vec_PtrPush( vQueue, pObj );
+        }
+    }
+    // perform retiming 
+    DegreeMax = 0;
+    Vec_PtrForEachEntry( vQueue, pObj, i )
+    {
+        pObj->fMark = 0;
+        // retime the node 
+        if ( fForward )
+        {
+            Rtm_ObjRetimeFwd( pRtm, pObj );
+            // check if its fanouts should be retimed
+            Rtm_ObjForEachFanout( pObj, pNext, k )
+            {
+                if ( pNext->fMark ) // skip aleady scheduled
+                    continue;
+                if ( pNext->Type ) // skip POs
+                    continue;
+                if ( !Rtm_ObjCheckRetimeFwd( pNext ) ) // skip non-retimable
+                    continue;
+                Degree = Rtm_ObjGetDegreeFwd( pNext );
+                DegreeMax = AIG_MAX( DegreeMax, Degree );
+                if ( Degree > nStepsMax ) // skip nodes with high degree
+                    continue;
+                pNext->fMark = 1;
+                pNext->Num = Degree;
+                Vec_PtrPush( vQueue, pNext );
+            }
+        }
+        else
+        {
+            Rtm_ObjRetimeBwd( pRtm, pObj );
+            // check if its fanouts should be retimed
+            Rtm_ObjForEachFanin( pObj, pNext, k )
+            {
+                if ( pNext->fMark ) // skip aleady scheduled
+                    continue;
+                if ( pNext->nFanins == 0 ) // skip PIs
+                    continue;
+                if ( !Rtm_ObjCheckRetimeBwd( pNext ) ) // skip non-retimable
+                    continue;
+                Degree = Rtm_ObjGetDegreeBwd( pNext );
+                DegreeMax = AIG_MAX( DegreeMax, Degree );
+                if ( Degree > nStepsMax ) // skip nodes with high degree
+                    continue;
+                pNext->fMark = 1;
+                pNext->Num = Degree;
+                Vec_PtrPush( vQueue, pNext );
+            }
+        }
+    }
+
+    if ( fVerbose )
+    {
+        printf( "Performed %d %s latch moves of max depth %d and max latch count %d.\n", 
+            Vec_PtrSize(vQueue), fForward? "fwd":"bwd", DegreeMax, Rtm_ManLatchMax(pRtm) );
+        printf( "Memory usage = %d.  ", pRtm->nExtraCur );
+        PRT( "Time", clock() - clk );
+    }
+    Vec_PtrFree( vQueue );
+
+    // get the new manager
+    pNew = Rtm_ManToAig( pRtm );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    Rtm_ManFree( pRtm );
+    // group the registers
+clk = clock();
+    pNew = Aig_ManReduceLaches( pNew, fVerbose );
+    if ( fVerbose )
+    {
+        PRT( "Register sharing time", clock() - clk );
+    }
+    return pNew;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigScl.c b/abc70930/src/aig/aig/aigScl.c
new file mode 100644
index 00000000..aae088a3
--- /dev/null
+++ b/abc70930/src/aig/aig/aigScl.c
@@ -0,0 +1,399 @@
+/**CFile****************************************************************
+
+  FileName    [aigScl.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Sequential cleanup.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigScl.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Remaps the manager.]
+
+  Description [Map in the array specifies for each CI nodes the node that
+  should be used after remapping.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManRemap( Aig_Man_t * p, Vec_Ptr_t * vMap )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj, * pObjMapped;
+    int i;
+    // create the new manager
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    pNew->nRegs = p->nRegs;
+    pNew->nAsserts = p->nAsserts;
+    if ( p->vFlopNums )
+        pNew->vFlopNums = Vec_IntDup( p->vFlopNums );
+    // create the PIs
+    Aig_ManCleanData( p );
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    // implement the mapping
+    Aig_ManForEachPi( p, pObj, i )
+    {
+        pObjMapped = Vec_PtrEntry( vMap, i );
+        pObj->pData = Aig_NotCond( Aig_Regular(pObjMapped)->pData, Aig_IsComplement(pObjMapped) );
+    }
+    // duplicate internal nodes
+    Aig_ManForEachObj( p, pObj, i )
+        if ( Aig_ObjIsBuf(pObj) )
+            pObj->pData = Aig_ObjChild0Copy(pObj);
+        else if ( Aig_ObjIsNode(pObj) )
+            pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+    // add the POs
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ObjCreatePo( pNew, Aig_ObjChild0Copy(pObj) );
+    assert( Aig_ManNodeNum(p) >= Aig_ManNodeNum(pNew) );
+    // check the resulting network
+    if ( !Aig_ManCheck(pNew) )
+        printf( "Aig_ManDup(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManSeqCleanup_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    // collect latch input corresponding to unmarked PI (latch output)
+    if ( Aig_ObjIsPi(pObj) )
+    {
+        Vec_PtrPush( vNodes, pObj->pNext );
+        return;
+    }
+    if ( Aig_ObjIsPo(pObj) )
+    {
+        Aig_ManSeqCleanup_rec( p, Aig_ObjFanin0(pObj), vNodes );
+        return;
+    }
+    assert( Aig_ObjIsNode(pObj) );
+    Aig_ManSeqCleanup_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    Aig_ManSeqCleanup_rec( p, Aig_ObjFanin1(pObj), vNodes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManSeqCleanup( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes, * vCis, * vCos;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
+    int i, nTruePis, nTruePos;
+    assert( Aig_ManBufNum(p) == 0 );
+
+    // mark the PIs
+    Aig_ManIncrementTravId( p );
+    Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+
+    // prepare to collect nodes reachable from POs
+    vNodes = Vec_PtrAlloc( 100 );
+    Aig_ManForEachPoSeq( p, pObj, i )
+        Vec_PtrPush( vNodes, pObj );
+
+    // remember latch inputs in latch outputs
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        pObjLo->pNext = pObjLi;
+    // mark the nodes reachable from these nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Aig_ManSeqCleanup_rec( p, pObj, vNodes );
+    assert( Vec_PtrSize(vNodes) <= Aig_ManPoNum(p) );
+    // clean latch output pointers
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        pObjLo->pNext = NULL;
+
+    // if some latches are removed, update PIs/POs
+    if ( Vec_PtrSize(vNodes) < Aig_ManPoNum(p) )
+    {
+        if ( p->vFlopNums )
+        {
+            int nTruePos = Aig_ManPoNum(p)-Aig_ManRegNum(p);
+            // remember numbers of flops in the flops
+            Aig_ManForEachLiSeq( p, pObj, i )
+                pObj->pNext = (Aig_Obj_t *)(long)Vec_IntEntry( p->vFlopNums, i - nTruePos );
+            // reset the flop numbers
+            Vec_PtrForEachEntryStart( vNodes, pObj, i, nTruePos )
+                Vec_IntWriteEntry( p->vFlopNums, i - nTruePos, (int)(long)pObj->pNext );
+            Vec_IntShrink( p->vFlopNums, Vec_PtrSize(vNodes) - nTruePos );
+            // clean the next pointer
+            Aig_ManForEachLiSeq( p, pObj, i )
+                pObj->pNext = NULL;
+        }
+        // collect new CIs/COs
+        vCis = Vec_PtrAlloc( Aig_ManPiNum(p) );
+        Aig_ManForEachPi( p, pObj, i )
+            if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+                Vec_PtrPush( vCis, pObj );
+            else
+            {
+                Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+//                Aig_ManRecycleMemory( p, pObj );
+            }
+        vCos = Vec_PtrAlloc( Aig_ManPoNum(p) );
+        Aig_ManForEachPo( p, pObj, i )
+            if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+                Vec_PtrPush( vCos, pObj );
+            else
+            {
+                Aig_ObjDisconnect( p, pObj );
+                Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+//                Aig_ManRecycleMemory( p, pObj );
+            }
+        // remember the number of true PIs/POs
+        nTruePis = Aig_ManPiNum(p) - Aig_ManRegNum(p);
+        nTruePos = Aig_ManPoNum(p) - Aig_ManRegNum(p);
+        // set the new number of registers
+        p->nRegs -= Aig_ManPoNum(p) - Vec_PtrSize(vNodes);
+        // create new PIs/POs
+        assert( Vec_PtrSize(vCis) == nTruePis + p->nRegs );
+        assert( Vec_PtrSize(vCos) == nTruePos + p->nRegs );
+        Vec_PtrFree( p->vPis );    p->vPis = vCis;
+        Vec_PtrFree( p->vPos );    p->vPos = vCos;
+        p->nObjs[AIG_OBJ_PI] = Vec_PtrSize( p->vPis );
+        p->nObjs[AIG_OBJ_PO] = Vec_PtrSize( p->vPos );
+                
+    }
+    Vec_PtrFree( vNodes );
+    // remove dangling nodes
+    return Aig_ManCleanup( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManCountMergeRegs( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pFanin;
+    int i, Counter = 0, Const0 = 0, Const1 = 0;
+    Aig_ManIncrementTravId( p );
+    Aig_ManForEachLiSeq( p, pObj, i )
+    {
+        pFanin = Aig_ObjFanin0(pObj);
+        if ( Aig_ObjIsConst1(pFanin) )
+        {
+            if ( Aig_ObjFaninC0(pObj) )
+                Const0++;
+            else
+                Const1++;
+        }
+        if ( Aig_ObjIsTravIdCurrent(p, pFanin) )
+            continue;
+        Aig_ObjSetTravIdCurrent(p, pFanin);
+        Counter++;
+    }
+    printf( "Regs = %d. Fanins = %d. Const0 = %d. Const1 = %d.\n", 
+        Aig_ManRegNum(p), Counter, Const0, Const1 );
+    return 0;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Checks how many latches can be reduced.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManReduceLachesCount( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pFanin;
+    int i, Counter = 0, Diffs = 0;
+    assert( Aig_ManRegNum(p) > 0 );
+    Aig_ManForEachObj( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    Aig_ManForEachLiSeq( p, pObj, i )
+    {
+        pFanin = Aig_ObjFanin0(pObj);
+        if ( Aig_ObjFaninC0(pObj) )
+        {
+            if ( pFanin->fMarkB )
+                Counter++;
+            else
+                pFanin->fMarkB = 1;
+        }
+        else
+        {
+            if ( pFanin->fMarkA )
+                Counter++;
+            else
+                pFanin->fMarkA = 1;
+        }
+    }
+    // count fanins that have both attributes
+    Aig_ManForEachLiSeq( p, pObj, i )
+    {
+        pFanin = Aig_ObjFanin0(pObj);
+        Diffs += pFanin->fMarkA && pFanin->fMarkB;
+        pFanin->fMarkA = pFanin->fMarkB = 0;
+    }
+//    printf( "Diffs = %d.\n", Diffs );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reduces the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManReduceLachesOnce( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vMap;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo, * pFanin;
+    int * pMapping, i;
+    // start mapping by adding the true PIs
+    vMap = Vec_PtrAlloc( Aig_ManPiNum(p) );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        Vec_PtrPush( vMap, pObj );
+    // create mapping of fanin nodes into the corresponding latch outputs
+    pMapping = ALLOC( int, 2 * Aig_ManObjNumMax(p) );
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+    {
+        pFanin = Aig_ObjFanin0(pObjLi);
+        if ( Aig_ObjFaninC0(pObjLi) )
+        {
+            if ( pFanin->fMarkB )
+            {
+                Vec_PtrPush( vMap, Aig_ManLo(p, pMapping[2*pFanin->Id + 1]) );
+            }
+            else
+            {
+                pFanin->fMarkB = 1;
+                pMapping[2*pFanin->Id + 1] = i;
+                Vec_PtrPush( vMap, pObjLo );
+            }
+        }
+        else
+        {
+            if ( pFanin->fMarkA )
+            {
+                Vec_PtrPush( vMap, Aig_ManLo(p, pMapping[2*pFanin->Id]) );
+            }
+            else
+            {
+                pFanin->fMarkA = 1;
+                pMapping[2*pFanin->Id] = i;
+                Vec_PtrPush( vMap, pObjLo );
+            }
+        }
+    }
+    free( pMapping );
+    Aig_ManForEachLiSeq( p, pObj, i )
+    {
+        pFanin = Aig_ObjFanin0(pObj);
+        pFanin->fMarkA = pFanin->fMarkB = 0;
+    }
+    return vMap;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reduces the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManReduceLaches( Aig_Man_t * p, int fVerbose )
+{
+    Aig_Man_t * pTemp;
+    Vec_Ptr_t * vMap;
+    int nSaved, nCur;
+    for ( nSaved = 0; (nCur = Aig_ManReduceLachesCount(p)); nSaved += nCur )
+    {
+        if ( fVerbose )
+        {
+        printf( "Saved = %5d.   ", nCur );
+        printf( "RBeg = %5d. NBeg = %6d.   ", Aig_ManRegNum(p), Aig_ManNodeNum(p) );
+        }
+        vMap = Aig_ManReduceLachesOnce( p );
+        p = Aig_ManRemap( pTemp = p, vMap );
+        Aig_ManStop( pTemp );
+        Vec_PtrFree( vMap );
+        Aig_ManSeqCleanup( p );
+        if ( fVerbose )
+        {
+        printf( "REnd = %5d. NEnd = %6d.   ", Aig_ManRegNum(p), Aig_ManNodeNum(p) );
+        printf( "\n" );
+        }
+        if ( p->nRegs == 0 )
+            break;
+    }
+    return p;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigSeq.c b/abc70930/src/aig/aig/aigSeq.c
new file mode 100644
index 00000000..daafeab1
--- /dev/null
+++ b/abc70930/src/aig/aig/aigSeq.c
@@ -0,0 +1,502 @@
+/**CFile****************************************************************
+
+  FileName    [aigSeq.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Sequential strashing.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigSeq.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Converts combinational AIG manager into a sequential one.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManSeqStrashConvert( Aig_Man_t * p, int nLatches, int * pInits )
+{
+    Aig_Obj_t * pObjLi, * pObjLo, * pLatch;
+    int i;
+    assert( Vec_PtrSize( p->vBufs ) == 0 );
+    // collect the POs to be converted into latches
+    for ( i = 0; i < nLatches; i++ )
+    {
+        // get the corresponding PI/PO pair
+        pObjLi = Aig_ManPo( p, Aig_ManPoNum(p) - nLatches + i );
+        pObjLo = Aig_ManPi( p, Aig_ManPiNum(p) - nLatches + i );
+        // create latch
+        pLatch = Aig_Latch( p, Aig_ObjChild0(pObjLi), pInits? pInits[i] : 0 );
+        // recycle the old PO object
+        Aig_ObjDisconnect( p, pObjLi );
+        Vec_PtrWriteEntry( p->vObjs, pObjLi->Id, NULL );
+        Aig_ManRecycleMemory( p, pObjLi );
+        // convert the corresponding PI to be a buffer and connect it to the latch
+        pObjLo->Type = AIG_OBJ_BUF;
+        Aig_ObjConnect( p, pObjLo, pLatch, NULL );
+        // save the buffer
+//        Vec_PtrPush( p->vBufs, pObjLo );
+    }
+    // shrink the arrays
+    Vec_PtrShrink( p->vPis, Aig_ManPiNum(p) - nLatches );
+    Vec_PtrShrink( p->vPos, Aig_ManPoNum(p) - nLatches );
+    // update the counters of different objects
+    p->nObjs[AIG_OBJ_PI]  -= nLatches;
+    p->nObjs[AIG_OBJ_PO]  -= nLatches;
+    p->nObjs[AIG_OBJ_BUF] += nLatches;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDfsSeq_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( pObj == NULL )
+        return;
+    if ( Aig_ObjIsTravIdCurrent( p, pObj ) )
+        return;
+    Aig_ObjSetTravIdCurrent( p, pObj );
+    if ( Aig_ObjIsPi(pObj) || Aig_ObjIsConst1(pObj) )
+        return;
+    Aig_ManDfsSeq_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    Aig_ManDfsSeq_rec( p, Aig_ObjFanin1(pObj), vNodes );
+//    if ( (Aig_ObjFanin0(pObj) == NULL || Aig_ObjIsBuf(Aig_ObjFanin0(pObj))) &&
+//         (Aig_ObjFanin1(pObj) == NULL || Aig_ObjIsBuf(Aig_ObjFanin1(pObj))) )
+        Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfsSeq( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManIncrementTravId( p );
+    vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ManDfsSeq_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDfsUnreach_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( pObj == NULL )
+        return;
+    if ( Aig_ObjIsTravIdPrevious(p, pObj) || Aig_ObjIsTravIdCurrent(p, pObj) )
+        return;
+    Aig_ObjSetTravIdPrevious( p, pObj ); // assume unknown
+    Aig_ManDfsUnreach_rec( p, Aig_ObjFanin0(pObj), vNodes );
+    Aig_ManDfsUnreach_rec( p, Aig_ObjFanin1(pObj), vNodes );
+    if ( Aig_ObjIsTravIdPrevious(p, Aig_ObjFanin0(pObj)) && 
+        (Aig_ObjFanin1(pObj) == NULL || Aig_ObjIsTravIdPrevious(p, Aig_ObjFanin1(pObj))) )
+        Vec_PtrPush( vNodes, pObj );
+    else
+        Aig_ObjSetTravIdCurrent( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes unreachable from PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManDfsUnreach( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj, * pFanin;
+    int i, k;//, RetValue;
+    // collect unreachable nodes
+    Aig_ManIncrementTravId( p ); 
+    Aig_ManIncrementTravId( p ); 
+    // mark the constant and PIs
+    Aig_ObjSetTravIdPrevious( p, Aig_ManConst1(p) );
+    Aig_ManForEachPi( p, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    // curr marks visited nodes reachable from PIs
+    // prev marks visited nodes unreachable or unknown
+
+    // collect the unreachable nodes
+    vNodes = Vec_PtrAlloc( 32 );
+    Aig_ManForEachPo( p, pObj, i )
+        Aig_ManDfsUnreach_rec( p, Aig_ObjFanin0(pObj), vNodes );
+
+    // refine resulting nodes
+    do 
+    {
+        k = 0;
+        Vec_PtrForEachEntry( vNodes, pObj, i )
+        {
+            assert( Aig_ObjIsTravIdPrevious(p, pObj) );
+            if ( Aig_ObjIsLatch(pObj) || Aig_ObjIsBuf(pObj) )
+            {
+                pFanin = Aig_ObjFanin0(pObj);
+                assert( Aig_ObjIsTravIdPrevious(p, pFanin) || Aig_ObjIsTravIdCurrent(p, pFanin) );
+                if ( Aig_ObjIsTravIdCurrent(p, pFanin) )
+                {
+                    Aig_ObjSetTravIdCurrent( p, pObj );
+                    continue;
+                }
+            }
+            else // AND gate
+            {
+                assert( Aig_ObjIsNode(pObj) );
+                pFanin = Aig_ObjFanin0(pObj);
+                assert( Aig_ObjIsTravIdPrevious(p, pFanin) || Aig_ObjIsTravIdCurrent(p, pFanin) );
+                if ( Aig_ObjIsTravIdCurrent(p, pFanin) )
+                {
+                    Aig_ObjSetTravIdCurrent( p, pObj );
+                    continue;
+                }
+                pFanin = Aig_ObjFanin1(pObj);
+                assert( Aig_ObjIsTravIdPrevious(p, pFanin) || Aig_ObjIsTravIdCurrent(p, pFanin) );
+                if ( Aig_ObjIsTravIdCurrent(p, pFanin) )
+                {
+                    Aig_ObjSetTravIdCurrent( p, pObj );
+                    continue;
+                }
+            }
+            // write it back
+            Vec_PtrWriteEntry( vNodes, k++, pObj );
+        }
+        Vec_PtrShrink( vNodes, k );
+    } 
+    while ( k < i );
+
+//    if ( Vec_PtrSize(vNodes) > 0 )
+//        printf( "Found %d unreachable.\n", Vec_PtrSize(vNodes) ); 
+    return vNodes;
+
+/*
+    // the resulting array contains all unreachable nodes except const 1
+    if ( Vec_PtrSize(vNodes) == 0 )
+    {
+        Vec_PtrFree( vNodes );
+        return 0;
+    }
+    RetValue = Vec_PtrSize(vNodes);
+
+    // mark these nodes
+    Aig_ManIncrementTravId( p ); 
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Aig_ObjSetTravIdCurrent( p, pObj );
+    Vec_PtrFree( vNodes );
+    return RetValue;
+*/
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Removes nodes that do not fanout into POs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManRemoveUnmarked( Aig_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i, RetValue;
+    // collect unmarked nodes
+    vNodes = Vec_PtrAlloc( 100 );
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( Aig_ObjIsTerm(pObj) )
+            continue;
+        if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+            continue;
+//Aig_ObjPrintVerbose( pObj, 0 );
+        Aig_ObjDisconnect( p, pObj );
+        Vec_PtrPush( vNodes, pObj );
+    }
+    if ( Vec_PtrSize(vNodes) == 0 )
+    {
+        Vec_PtrFree( vNodes );
+        return 0;
+    }
+    // remove the dangling objects
+    RetValue = Vec_PtrSize(vNodes);
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Aig_ObjDelete( p, pObj );
+//    printf( "Removed %d dangling.\n", Vec_PtrSize(vNodes) ); 
+    Vec_PtrFree( vNodes );
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Rehashes the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManSeqRehashOne( Aig_Man_t * p, Vec_Ptr_t * vNodes, Vec_Ptr_t * vUnreach )
+{
+    Aig_Obj_t * pObj, * pObjNew, * pFanin0, * pFanin1;
+    int i, RetValue = 0, Counter = 0;//, Counter2 = 0;
+
+    // mark the unreachable nodes
+    Aig_ManIncrementTravId( p );
+    Vec_PtrForEachEntry( vUnreach, pObj, i )
+        Aig_ObjSetTravIdCurrent(p, pObj);
+/*
+    // count the number of unreachable object connections
+    // that is the number of unreachable objects connected to main objects
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+            continue;
+
+        pFanin0 = Aig_ObjFanin0(pObj);
+        if ( pFanin0 == NULL )
+            continue;
+        if ( Aig_ObjIsTravIdCurrent(p, pFanin0) )
+            pFanin0->fMarkA = 1;
+
+        pFanin1 = Aig_ObjFanin1(pObj);
+        if ( pFanin1 == NULL )
+            continue;
+        if ( Aig_ObjIsTravIdCurrent(p, pFanin1) )
+            pFanin1->fMarkA = 1;
+    }
+
+    // count the objects
+    Aig_ManForEachObj( p, pObj, i )
+        Counter2 += pObj->fMarkA, pObj->fMarkA = 0;
+    printf( "Connections = %d.\n", Counter2 );
+*/
+
+    // go through the nodes while skipping unreachable
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        // skip nodes unreachable from the PIs
+        if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+            continue;
+        // process the node
+        if ( Aig_ObjIsPo(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) )
+                continue;
+            pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            Aig_ObjPatchFanin0( p, pObj, pFanin0 );
+            continue;
+        }
+        if ( Aig_ObjIsLatch(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) )
+                continue;
+            pObjNew = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            pObjNew = Aig_Latch( p, pObjNew, 0 );
+            Aig_ObjReplace( p, pObj, pObjNew, 1, 0 );
+            RetValue = 1;
+            Counter++;
+            continue;
+        }
+        if ( Aig_ObjIsNode(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) && !Aig_ObjIsBuf(Aig_ObjFanin1(pObj)) )
+                continue;
+            pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            pFanin1 = Aig_ObjReal_rec( Aig_ObjChild1(pObj) );
+            pObjNew = Aig_And( p, pFanin0, pFanin1 );
+            Aig_ObjReplace( p, pObj, pObjNew, 1, 0 );
+            RetValue = 1;
+            Counter++;
+            continue;
+        }
+    }
+//    printf( "Rehashings = %d.\n", Counter++ );
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [If AIG contains buffers, this procedure removes them.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManRemoveBuffers( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pObjNew, * pFanin0, * pFanin1;
+    int i;
+    if ( Aig_ManBufNum(p) == 0 )
+        return;
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( Aig_ObjIsPo(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) )
+                continue;
+            pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            Aig_ObjPatchFanin0( p, pObj, pFanin0 );
+        }
+        else if ( Aig_ObjIsLatch(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) )
+                continue;
+            pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            pObjNew = Aig_Latch( p, pFanin0, 0 );
+            Aig_ObjReplace( p, pObj, pObjNew, 0, 0 );
+        }
+        else if ( Aig_ObjIsAnd(pObj) )
+        {
+            if ( !Aig_ObjIsBuf(Aig_ObjFanin0(pObj)) && !Aig_ObjIsBuf(Aig_ObjFanin1(pObj)) )
+                continue;
+            pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+            pFanin1 = Aig_ObjReal_rec( Aig_ObjChild1(pObj) );
+            pObjNew = Aig_And( p, pFanin0, pFanin1 );
+            Aig_ObjReplace( p, pObj, pObjNew, 0, 0 );
+        }
+    }
+    assert( Aig_ManBufNum(p) == 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManSeqStrash( Aig_Man_t * p, int nLatches, int * pInits )
+{
+    Vec_Ptr_t * vNodes, * vUnreach;
+//    Aig_Obj_t * pObj, * pFanin;
+//    int i;
+    int Iter, RetValue = 1;
+
+    // create latches out of the additional PI/PO pairs
+    Aig_ManSeqStrashConvert( p, nLatches, pInits );
+
+    // iteratively rehash the network
+    for ( Iter = 0; RetValue; Iter++ )
+    {
+//        Aig_ManPrintStats( p );
+/*
+        Aig_ManForEachObj( p, pObj, i )
+        {
+            assert( pObj->Type > 0 );
+            pFanin = Aig_ObjFanin0(pObj);
+            assert( pFanin == NULL || pFanin->Type > 0 );
+            pFanin = Aig_ObjFanin1(pObj);
+            assert( pFanin == NULL || pFanin->Type > 0 );
+        }
+*/
+        // mark nodes unreachable from the PIs
+        vUnreach = Aig_ManDfsUnreach( p );
+        if ( Iter == 0 && Vec_PtrSize(vUnreach) > 0 )
+            printf( "Unreachable objects = %d.\n", Vec_PtrSize(vUnreach) );
+        // collect nodes reachable from the POs
+        vNodes = Aig_ManDfsSeq( p );
+        // remove nodes unreachable from the POs
+        if ( Iter == 0 )
+            Aig_ManRemoveUnmarked( p );
+        // continue rehashing as long as there are changes
+        RetValue = Aig_ManSeqRehashOne( p, vNodes, vUnreach );
+        Vec_PtrFree( vNodes );
+        Vec_PtrFree( vUnreach );
+    }
+
+    // perform the final cleanup
+    Aig_ManIncrementTravId( p );
+    vNodes = Aig_ManDfsSeq( p );
+    Aig_ManRemoveUnmarked( p );
+    Vec_PtrFree( vNodes );
+    // remove buffers if they are left
+//    Aig_ManRemoveBuffers( p );
+
+    // clean up
+    if ( !Aig_ManCheck( p ) )
+    {
+        printf( "Aig_ManSeqStrash: The network check has failed.\n" );
+        return 0;
+    }
+    return 1;
+
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigShow.c b/abc70930/src/aig/aig/aigShow.c
new file mode 100644
index 00000000..96b0e37f
--- /dev/null
+++ b/abc70930/src/aig/aig/aigShow.c
@@ -0,0 +1,356 @@
+/**CFile****************************************************************
+
+  FileName    [ivyShow.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Visualization of HAIG.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyShow.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the graph structure of AIG for DOT.]
+
+  Description [Useful for graph visualization using tools such as GraphViz: 
+  http://www.graphviz.org/]
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_WriteDotAig( Aig_Man_t * pMan, char * pFileName, int fHaig, Vec_Ptr_t * vBold )
+{
+    FILE * pFile;
+    Aig_Obj_t * pNode;//, * pTemp, * pPrev;
+    int LevelMax, Level, i;
+
+    if ( Aig_ManNodeNum(pMan) > 200 )
+    {
+        fprintf( stdout, "Cannot visualize AIG with more than 200 nodes.\n" );
+        return;
+    }
+    if ( (pFile = fopen( pFileName, "w" )) == NULL )
+    {
+        fprintf( stdout, "Cannot open the intermediate file \"%s\".\n", pFileName );
+        return;
+    }
+
+    // mark the nodes
+    if ( vBold )
+        Vec_PtrForEachEntry( vBold, pNode, i )
+            pNode->fMarkB = 1;
+
+    // compute levels
+//    LevelMax = 1 + Aig_ManSetLevels( pMan, fHaig );
+    LevelMax = 1 + Aig_ManLevels( pMan );
+    Aig_ManForEachPo( pMan, pNode, i )
+        pNode->Level = LevelMax;
+
+    // write the DOT header
+    fprintf( pFile, "# %s\n",  "AIG structure generated by IVY package" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "digraph AIG {\n" );
+    fprintf( pFile, "size = \"7.5,10\";\n" );
+//  fprintf( pFile, "ranksep = 0.5;\n" );
+//  fprintf( pFile, "nodesep = 0.5;\n" );
+    fprintf( pFile, "center = true;\n" );
+//  fprintf( pFile, "orientation = landscape;\n" );
+//  fprintf( pFile, "edge [fontsize = 10];\n" );
+//  fprintf( pFile, "edge [dir = none];\n" );
+    fprintf( pFile, "edge [dir = back];\n" );
+    fprintf( pFile, "\n" );
+
+    // labels on the left of the picture
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  node [shape = plaintext];\n" );
+    fprintf( pFile, "  edge [style = invis];\n" );
+    fprintf( pFile, "  LevelTitle1 [label=\"\"];\n" );
+    fprintf( pFile, "  LevelTitle2 [label=\"\"];\n" );
+    // generate node names with labels
+    for ( Level = LevelMax; Level >= 0; Level-- )
+    {
+        // the visible node name
+        fprintf( pFile, "  Level%d", Level );
+        fprintf( pFile, " [label = " );
+        // label name
+        fprintf( pFile, "\"" );
+        fprintf( pFile, "\"" );
+        fprintf( pFile, "];\n" );
+    }
+
+    // genetate the sequence of visible/invisible nodes to mark levels
+    fprintf( pFile, "  LevelTitle1 ->  LevelTitle2 ->" );
+    for ( Level = LevelMax; Level >= 0; Level-- )
+    {
+        // the visible node name
+        fprintf( pFile, "  Level%d",  Level );
+        // the connector
+        if ( Level != 0 )
+            fprintf( pFile, " ->" );
+        else
+            fprintf( pFile, ";" );
+    }
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate title box on top
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    fprintf( pFile, "  LevelTitle1;\n" );
+    fprintf( pFile, "  title1 [shape=plaintext,\n" );
+    fprintf( pFile, "          fontsize=20,\n" );
+    fprintf( pFile, "          fontname = \"Times-Roman\",\n" );
+    fprintf( pFile, "          label=\"" );
+    fprintf( pFile, "%s", "AIG structure visualized by ABC" );
+    fprintf( pFile, "\\n" );
+    fprintf( pFile, "Benchmark \\\"%s\\\". ", "aig" );
+//    fprintf( pFile, "Time was %s. ",  Extra_TimeStamp() );
+    fprintf( pFile, "\"\n" );
+    fprintf( pFile, "         ];\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate statistics box
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    fprintf( pFile, "  LevelTitle2;\n" );
+    fprintf( pFile, "  title2 [shape=plaintext,\n" );
+    fprintf( pFile, "          fontsize=18,\n" );
+    fprintf( pFile, "          fontname = \"Times-Roman\",\n" );
+    fprintf( pFile, "          label=\"" );
+    fprintf( pFile, "The set contains %d logic nodes and spans %d levels.", Aig_ManNodeNum(pMan), LevelMax );
+    fprintf( pFile, "\\n" );
+    fprintf( pFile, "\"\n" );
+    fprintf( pFile, "         ];\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate the COs
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    // the labeling node of this level
+    fprintf( pFile, "  Level%d;\n",  LevelMax );
+    // generate the CO nodes
+    Aig_ManForEachPo( pMan, pNode, i )
+    {
+/*
+        if ( fHaig || pNode->pEquiv == NULL )
+            fprintf( pFile, "  Node%d%s [label = \"%d%s\"", pNode->Id, 
+                (Aig_ObjIsLatch(pNode)? "_in":""), pNode->Id, (Aig_ObjIsLatch(pNode)? "_in":"") );
+        else
+            fprintf( pFile, "  Node%d%s [label = \"%d%s(%d%s)\"", pNode->Id, 
+                (Aig_ObjIsLatch(pNode)? "_in":""), pNode->Id, (Aig_ObjIsLatch(pNode)? "_in":""), 
+                    Aig_Regular(pNode->pEquiv)->Id, Aig_IsComplement(pNode->pEquiv)? "\'":"" );
+*/
+        fprintf( pFile, "  Node%d [label = \"%d\"", pNode->Id, pNode->Id ); 
+
+        fprintf( pFile, ", shape = %s", (Aig_ObjIsLatch(pNode)? "box":"invtriangle") );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate nodes of each rank
+    for ( Level = LevelMax - 1; Level > 0; Level-- )
+    {
+        fprintf( pFile, "{\n" );
+        fprintf( pFile, "  rank = same;\n" );
+        // the labeling node of this level
+        fprintf( pFile, "  Level%d;\n",  Level );
+        Aig_ManForEachObj( pMan, pNode, i )
+        {
+            if ( (int)pNode->Level != Level )
+                continue;
+/*
+            if ( fHaig || pNode->pEquiv == NULL )
+                fprintf( pFile, "  Node%d [label = \"%d\"", pNode->Id, pNode->Id );
+            else 
+                fprintf( pFile, "  Node%d [label = \"%d(%d%s)\"", pNode->Id, pNode->Id, 
+                    Aig_Regular(pNode->pEquiv)->Id, Aig_IsComplement(pNode->pEquiv)? "\'":"" );
+*/
+            fprintf( pFile, "  Node%d [label = \"%d\"", pNode->Id, pNode->Id ); 
+
+            fprintf( pFile, ", shape = ellipse" );
+            if ( vBold && pNode->fMarkB )
+                fprintf( pFile, ", style = filled" );
+            fprintf( pFile, "];\n" );
+        }
+        fprintf( pFile, "}" );
+        fprintf( pFile, "\n" );
+        fprintf( pFile, "\n" );
+    }
+
+    // generate the CI nodes
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    // the labeling node of this level
+    fprintf( pFile, "  Level%d;\n",  0 );
+    // generate constant node
+    if ( Aig_ObjRefs(Aig_ManConst1(pMan)) > 0 )
+    {
+        pNode = Aig_ManConst1(pMan);
+        // check if the costant node is present
+        fprintf( pFile, "  Node%d [label = \"Const1\"", pNode->Id );
+        fprintf( pFile, ", shape = ellipse" );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    // generate the CI nodes
+    Aig_ManForEachPi( pMan, pNode, i )
+    {
+/*
+        if ( fHaig || pNode->pEquiv == NULL )
+            fprintf( pFile, "  Node%d%s [label = \"%d%s\"", pNode->Id, 
+                (Aig_ObjIsLatch(pNode)? "_out":""), pNode->Id, (Aig_ObjIsLatch(pNode)? "_out":"") );
+        else
+            fprintf( pFile, "  Node%d%s [label = \"%d%s(%d%s)\"", pNode->Id, 
+                (Aig_ObjIsLatch(pNode)? "_out":""), pNode->Id, (Aig_ObjIsLatch(pNode)? "_out":""), 
+                    Aig_Regular(pNode->pEquiv)->Id, Aig_IsComplement(pNode->pEquiv)? "\'":"" );
+*/
+        fprintf( pFile, "  Node%d [label = \"%d\"", pNode->Id, pNode->Id ); 
+
+        fprintf( pFile, ", shape = %s", (Aig_ObjIsLatch(pNode)? "box":"triangle") );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate invisible edges from the square down
+    fprintf( pFile, "title1 -> title2 [style = invis];\n" );
+    Aig_ManForEachPo( pMan, pNode, i )
+        fprintf( pFile, "title2 -> Node%d%s [style = invis];\n", pNode->Id, (Aig_ObjIsLatch(pNode)? "_in":"") );
+
+    // generate edges
+    Aig_ManForEachObj( pMan, pNode, i )
+    {
+        if ( !Aig_ObjIsNode(pNode) && !Aig_ObjIsPo(pNode) && !Aig_ObjIsBuf(pNode) )
+            continue;
+        // generate the edge from this node to the next
+        fprintf( pFile, "Node%d%s",  pNode->Id, (Aig_ObjIsLatch(pNode)? "_in":"") );
+        fprintf( pFile, " -> " );
+        fprintf( pFile, "Node%d%s",  Aig_ObjFaninId0(pNode), (Aig_ObjIsLatch(Aig_ObjFanin0(pNode))? "_out":"") );
+        fprintf( pFile, " [" );
+        fprintf( pFile, "style = %s", Aig_ObjFaninC0(pNode)? "dotted" : "bold" );
+//        if ( Aig_NtkIsSeq(pNode->pMan) && Seq_ObjFaninL0(pNode) > 0 )
+//        fprintf( pFile, ", label = \"%s\"", Seq_ObjFaninGetInitPrintable(pNode,0) );
+        fprintf( pFile, "]" );
+        fprintf( pFile, ";\n" );
+        if ( !Aig_ObjIsNode(pNode) )
+            continue;
+        // generate the edge from this node to the next
+        fprintf( pFile, "Node%d",  pNode->Id );
+        fprintf( pFile, " -> " );
+        fprintf( pFile, "Node%d%s",  Aig_ObjFaninId1(pNode), (Aig_ObjIsLatch(Aig_ObjFanin1(pNode))? "_out":"") );
+        fprintf( pFile, " [" );
+        fprintf( pFile, "style = %s", Aig_ObjFaninC1(pNode)? "dotted" : "bold" );
+//        if ( Aig_NtkIsSeq(pNode->pMan) && Seq_ObjFaninL1(pNode) > 0 )
+//        fprintf( pFile, ", label = \"%s\"", Seq_ObjFaninGetInitPrintable(pNode,1) );
+        fprintf( pFile, "]" );
+        fprintf( pFile, ";\n" );
+/*
+        // generate the edges between the equivalent nodes
+        if ( fHaig && pNode->pEquiv && Aig_ObjRefs(pNode) > 0 )
+        {
+            pPrev = pNode;
+            for ( pTemp = pNode->pEquiv; pTemp != pNode; pTemp = Aig_Regular(pTemp->pEquiv) )
+            {
+                fprintf( pFile, "Node%d",  pPrev->Id );
+                fprintf( pFile, " -> " );
+                fprintf( pFile, "Node%d",  pTemp->Id );
+                fprintf( pFile, " [style = %s]", Aig_IsComplement(pTemp->pEquiv)? "dotted" : "bold" );
+                fprintf( pFile, ";\n" );
+                pPrev = pTemp;
+            }
+            // connect the last node with the first
+            fprintf( pFile, "Node%d",  pPrev->Id );
+            fprintf( pFile, " -> " );
+            fprintf( pFile, "Node%d",  pNode->Id );
+            fprintf( pFile, " [style = %s]", Aig_IsComplement(pPrev->pEquiv)? "dotted" : "bold" );
+            fprintf( pFile, ";\n" );
+        }
+*/
+    }
+
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+    fclose( pFile );
+
+    // unmark nodes
+    if ( vBold )
+        Vec_PtrForEachEntry( vBold, pNode, i )
+            pNode->fMarkB = 0;
+
+    Aig_ManForEachPo( pMan, pNode, i )
+        pNode->Level = Aig_ObjFanin0(pNode)->Level;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManShow( Aig_Man_t * pMan, int fHaig, Vec_Ptr_t * vBold )
+{
+    extern void Abc_ShowFile( char * FileNameDot );
+    static Counter = 0;
+    char FileNameDot[200];
+    FILE * pFile;
+    // create the file name
+//    Aig_ShowGetFileName( pMan->pName, FileNameDot );
+    sprintf( FileNameDot, "temp%02d.dot", Counter++ );
+    // check that the file can be opened
+    if ( (pFile = fopen( FileNameDot, "w" )) == NULL )
+    {
+        fprintf( stdout, "Cannot open the intermediate file \"%s\".\n", FileNameDot );
+        return;
+    }
+    fclose( pFile );
+    // generate the file
+    Aig_WriteDotAig( pMan, FileNameDot, fHaig, vBold );
+    // visualize the file 
+    Abc_ShowFile( FileNameDot );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigTable.c b/abc70930/src/aig/aig/aigTable.c
new file mode 100644
index 00000000..94593d70
--- /dev/null
+++ b/abc70930/src/aig/aig/aigTable.c
@@ -0,0 +1,268 @@
+/**CFile****************************************************************
+
+  FileName    [aigTable.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Structural hashing table.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigTable.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// hashing the node
+static unsigned long Aig_Hash( Aig_Obj_t * pObj, int TableSize ) 
+{
+    unsigned long Key = Aig_ObjIsExor(pObj) * 1699;
+    Key ^= Aig_ObjFanin0(pObj)->Id * 7937;
+    Key ^= Aig_ObjFanin1(pObj)->Id * 2971;
+    Key ^= Aig_ObjFaninC0(pObj) * 911;
+    Key ^= Aig_ObjFaninC1(pObj) * 353;
+    return Key % TableSize;
+}
+
+// returns the place where this node is stored (or should be stored)
+static Aig_Obj_t ** Aig_TableFind( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t ** ppEntry;
+    if ( Aig_ObjIsLatch(pObj) )
+    {
+        assert( Aig_ObjChild0(pObj) && Aig_ObjChild1(pObj) == NULL );
+    }
+    else
+    {
+        assert( Aig_ObjChild0(pObj) && Aig_ObjChild1(pObj) );
+        assert( Aig_ObjFanin0(pObj)->Id < Aig_ObjFanin1(pObj)->Id );
+    }
+    for ( ppEntry = p->pTable + Aig_Hash(pObj, p->nTableSize); *ppEntry; ppEntry = &(*ppEntry)->pNext )
+        if ( *ppEntry == pObj )
+            return ppEntry;
+    assert( *ppEntry == NULL );
+    return ppEntry;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+ 
+/**Function*************************************************************
+
+  Synopsis    [Resizes the table.]
+
+  Description [Typically this procedure should not be called.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TableResize( Aig_Man_t * p )
+{
+    Aig_Obj_t * pEntry, * pNext;
+    Aig_Obj_t ** pTableOld, ** ppPlace;
+    int nTableSizeOld, Counter, i, clk;
+clk = clock();
+    // save the old table
+    pTableOld = p->pTable;
+    nTableSizeOld = p->nTableSize;
+    // get the new table
+    p->nTableSize = Aig_PrimeCudd( 2 * Aig_ManNodeNum(p) ); 
+    p->pTable = ALLOC( Aig_Obj_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Aig_Obj_t *) * p->nTableSize );
+    // rehash the entries from the old table
+    Counter = 0;
+    for ( i = 0; i < nTableSizeOld; i++ )
+    for ( pEntry = pTableOld[i], pNext = pEntry? pEntry->pNext : NULL; 
+          pEntry; pEntry = pNext, pNext = pEntry? pEntry->pNext : NULL )
+    {
+        // get the place where this entry goes in the table 
+        ppPlace = Aig_TableFind( p, pEntry );
+        assert( *ppPlace == NULL ); // should not be there
+        // add the entry to the list
+        *ppPlace = pEntry;
+        pEntry->pNext = NULL;
+        Counter++;
+    }
+    assert( Counter == Aig_ManNodeNum(p) );
+//    printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize );
+//    PRT( "Time", clock() - clk );
+    // replace the table and the parameters
+    free( pTableOld );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if node with the given attributes is in the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_TableLookup( Aig_Man_t * p, Aig_Obj_t * pGhost )
+{
+    Aig_Obj_t * pEntry;
+    assert( !Aig_IsComplement(pGhost) );
+    if ( pGhost->Type == AIG_OBJ_LATCH )
+    {
+        assert( Aig_ObjChild0(pGhost) && Aig_ObjChild1(pGhost) == NULL );
+        if ( !Aig_ObjRefs(Aig_ObjFanin0(pGhost)) )
+            return NULL;
+    }
+    else
+    {
+        assert( pGhost->Type == AIG_OBJ_AND );
+        assert( Aig_ObjChild0(pGhost) && Aig_ObjChild1(pGhost) );
+        assert( Aig_ObjFanin0(pGhost)->Id < Aig_ObjFanin1(pGhost)->Id );
+        if ( !Aig_ObjRefs(Aig_ObjFanin0(pGhost)) || !Aig_ObjRefs(Aig_ObjFanin1(pGhost)) )
+            return NULL;
+    }
+    for ( pEntry = p->pTable[Aig_Hash(pGhost, p->nTableSize)]; pEntry; pEntry = pEntry->pNext )
+    {
+        if ( Aig_ObjChild0(pEntry) == Aig_ObjChild0(pGhost) && 
+             Aig_ObjChild1(pEntry) == Aig_ObjChild1(pGhost) && 
+             Aig_ObjType(pEntry) == Aig_ObjType(pGhost) )
+            return pEntry;
+    }
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if node with the given attributes is in the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_TableLookupTwo( Aig_Man_t * p, Aig_Obj_t * pFanin0, Aig_Obj_t * pFanin1 )
+{
+    Aig_Obj_t * pGhost;
+    // consider simple cases
+    if ( pFanin0 == pFanin1 )
+        return pFanin0;
+    if ( pFanin0 == Aig_Not(pFanin1) )
+        return Aig_ManConst0(p);
+    if ( Aig_Regular(pFanin0) == Aig_ManConst1(p) )
+        return pFanin0 == Aig_ManConst1(p) ? pFanin1 : Aig_ManConst0(p);
+    if ( Aig_Regular(pFanin1) == Aig_ManConst1(p) )
+        return pFanin1 == Aig_ManConst1(p) ? pFanin0 : Aig_ManConst0(p);
+    pGhost = Aig_ObjCreateGhost( p, pFanin0, pFanin1, AIG_OBJ_AND );
+    return Aig_TableLookup( p, pGhost );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the new node to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TableInsert( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t ** ppPlace;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_TableLookup(p, pObj) == NULL );
+    if ( (pObj->Id & 0xFF) == 0 && 2 * p->nTableSize < Aig_ManNodeNum(p) )
+        Aig_TableResize( p );
+    ppPlace = Aig_TableFind( p, pObj );
+    assert( *ppPlace == NULL );
+    *ppPlace = pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node from the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TableDelete( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t ** ppPlace;
+    assert( !Aig_IsComplement(pObj) );
+    ppPlace = Aig_TableFind( p, pObj );
+    assert( *ppPlace == pObj ); // node should be in the table
+    // remove the node
+    *ppPlace = pObj->pNext;
+    pObj->pNext = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of nodes in the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_TableCountEntries( Aig_Man_t * p )
+{
+    Aig_Obj_t * pEntry;
+    int i, Counter = 0;
+    for ( i = 0; i < p->nTableSize; i++ )
+        for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
+            Counter++;
+    return Counter;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Profiles the hash table.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Aig_TableProfile( Aig_Man_t * p )
+{
+    Aig_Obj_t * pEntry;
+    int i, Counter;
+    for ( i = 0; i < p->nTableSize; i++ )
+    {
+        Counter = 0;
+        for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
+            Counter++;
+        if ( Counter ) 
+            printf( "%d ", Counter );
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigTime.c b/abc70930/src/aig/aig/aigTime.c
new file mode 100644
index 00000000..42f5f575
--- /dev/null
+++ b/abc70930/src/aig/aig/aigTime.c
@@ -0,0 +1,299 @@
+/**CFile****************************************************************
+
+  FileName    [aigTime.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Representation of timing information.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigTime.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Aig_TBox_t_           Aig_TBox_t;
+typedef struct Aig_TObj_t_           Aig_TObj_t;
+
+// timing manager
+struct Aig_TMan_t_
+{
+    Vec_Ptr_t *      vBoxes;         // the timing boxes
+    Aig_MmFlex_t *   pMemObj;        // memory manager for boxes
+    int              nTravIds;       // traversal ID of the manager
+    int              nPis;           // the number of PIs
+    int              nPos;           // the number of POs
+    Aig_TObj_t *     pPis;           // timing info for the PIs
+    Aig_TObj_t *     pPos;           // timing info for the POs
+};
+
+// timing box
+struct Aig_TBox_t_
+{
+    int              iBox;           // the unique ID of this box
+    int              TravId;         // traversal ID of this box
+    int              nInputs;        // the number of box inputs 
+    int              nOutputs;       // the number of box outputs
+    int              Inouts[0];      // the int numbers of PIs and POs
+};
+
+// timing object
+struct Aig_TObj_t_
+{
+    int              iObj2Box;       // mapping of the object into its box
+    float            timeOffset;     // the static timing of the node
+    float            timeActual;     // the actual timing of the node
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the network manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_TMan_t * Aig_TManStart( int nPis, int nPos )
+{
+    Aig_TMan_t * p;
+    int i;
+    p = ALLOC( Aig_TMan_t, 1 );
+    memset( p, 0, sizeof(Aig_TMan_t) );
+    p->pMemObj = Aig_MmFlexStart();
+    p->vBoxes  = Vec_PtrAlloc( 100 );
+    Vec_PtrPush( p->vBoxes, NULL );
+    p->nPis = nPis;
+    p->nPos = nPos;
+    p->pPis = ALLOC( Aig_TObj_t, nPis );
+    memset( p->pPis, 0, sizeof(Aig_TObj_t) * nPis );
+    p->pPos = ALLOC( Aig_TObj_t, nPos );
+    memset( p->pPos, 0, sizeof(Aig_TObj_t) * nPos );
+    for ( i = 0; i < nPis; i++ )
+        p->pPis[i].iObj2Box = -1;
+    for ( i = 0; i < nPos; i++ )
+        p->pPos[i].iObj2Box = -1;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the network manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManStop( Aig_TMan_t * p )
+{
+    Vec_PtrFree( p->vBoxes );
+    Aig_MmFlexStop( p->pMemObj, 0 );
+    free( p->pPis );
+    free( p->pPos );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the new timing box.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManCreateBox( Aig_TMan_t * p, int * pPis, int nPis, int * pPos, int nPos, float * pPiTimes, float * pPoTimes )
+{
+    Aig_TBox_t * pBox;
+    int i;
+    pBox = (Aig_TBox_t *)Aig_MmFlexEntryFetch( p->pMemObj, sizeof(Aig_TBox_t) + sizeof(int) * (nPis+nPos) );
+    memset( pBox, 0, sizeof(Aig_TBox_t) );
+    pBox->iBox = Vec_PtrSize( p->vBoxes );
+    Vec_PtrPush( p->vBoxes, pBox );
+    pBox->nInputs = nPis;
+    pBox->nOutputs = nPos;
+    for ( i = 0; i < nPis; i++ )
+    {
+        assert( pPis[i] < p->nPis );
+        pBox->Inouts[i] = pPis[i];
+        Aig_TManSetPiArrival( p, pPis[i], pPiTimes[i] );
+        p->pPis[pPis[i]].iObj2Box = pBox->iBox;
+    }
+    for ( i = 0; i < nPos; i++ )
+    {
+        assert( pPos[i] < p->nPos );
+        pBox->Inouts[nPis+i] = pPos[i];
+        Aig_TManSetPoRequired( p, pPos[i], pPoTimes[i] );
+        p->pPos[pPos[i]].iObj2Box = pBox->iBox;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the new timing box.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManSetPiDelay( Aig_TMan_t * p, int iPi, float Delay )
+{
+    assert( iPi < p->nPis );
+    p->pPis[iPi].timeActual = Delay;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the new timing box.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManSetPoDelay( Aig_TMan_t * p, int iPo, float Delay )
+{
+    assert( iPo < p->nPos );
+    p->pPos[iPo].timeActual = Delay;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the new timing box.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManSetPiArrival( Aig_TMan_t * p, int iPi, float Delay )
+{
+    assert( iPi < p->nPis );
+    p->pPis[iPi].timeOffset = Delay;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the new timing box.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManSetPoRequired( Aig_TMan_t * p, int iPo, float Delay )
+{
+    assert( iPo < p->nPos );
+    p->pPos[iPo].timeOffset = Delay;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Increments the trav ID of the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TManIncrementTravId( Aig_TMan_t * p )
+{
+    p->nTravIds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns PI arrival time.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+float Aig_TManGetPiArrival( Aig_TMan_t * p, int iPi )
+{
+    Aig_TBox_t * pBox;
+    Aig_TObj_t * pObj;
+    float DelayMax;
+    int i;
+    assert( iPi < p->nPis );
+    if ( p->pPis[iPi].iObj2Box < 0 )
+        return p->pPis[iPi].timeOffset;
+    pBox = Vec_PtrEntry( p->vBoxes, p->pPis[iPi].iObj2Box );
+    // check if box timing is updated
+    if ( pBox->TravId == p->nTravIds )
+        return p->pPis[iPi].timeOffset;
+    pBox->TravId = p->nTravIds;
+    // update box timing
+    DelayMax = -1.0e+20F;
+    for ( i = 0; i < pBox->nOutputs; i++ )
+    {
+        pObj = p->pPos + pBox->Inouts[pBox->nInputs+i];
+        DelayMax = AIG_MAX( DelayMax, pObj->timeActual + pObj->timeOffset );
+    }
+    for ( i = 0; i < pBox->nInputs; i++ )
+    {
+        pObj = p->pPis + pBox->Inouts[i];
+        pObj->timeActual = DelayMax + pObj->timeOffset;
+    }
+    return p->pPis[iPi].timeActual;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns PO required time.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+float Aig_TManGetPoRequired( Aig_TMan_t * p, int iPo )
+{
+    return 0.0;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigTiming.c b/abc70930/src/aig/aig/aigTiming.c
new file mode 100644
index 00000000..de8fdc7c
--- /dev/null
+++ b/abc70930/src/aig/aig/aigTiming.c
@@ -0,0 +1,351 @@
+/**CFile****************************************************************
+
+  FileName    [aigTiming.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Incremental updating of direct/reverse AIG levels.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigTiming.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the reverse level of the node.]
+
+  Description [The reverse level is the level of the node in reverse
+  topological order, starting from the COs.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Aig_ObjReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( p->vLevelR );
+    Vec_IntFillExtra( p->vLevelR, pObj->Id + 1, 0 );
+    return Vec_IntEntry(p->vLevelR, pObj->Id);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the reverse level of the node.]
+
+  Description [The reverse level is the level of the node in reverse
+  topological order, starting from the COs.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Aig_ObjSetReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObj, int LevelR )
+{
+    assert( p->vLevelR );
+    Vec_IntFillExtra( p->vLevelR, pObj->Id + 1, 0 );
+    Vec_IntWriteEntry( p->vLevelR, pObj->Id, LevelR );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Resets reverse level of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjClearReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_ObjSetReverseLevel( p, pObj, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns required level of the node.]
+
+  Description [Converts the reverse levels of the node into its required 
+  level as follows: ReqLevel(Node) = MaxLevels(Ntk) + 1 - LevelR(Node).]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjRequiredLevel( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( p->vLevelR );
+    return p->nLevelMax + 1 - Aig_ObjReverseLevel(p, pObj);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the reverse level of the node using its fanout levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjReverseLevelNew( Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pFanout;
+    int i, iFanout = -1, LevelCur, Level = 0;
+    Aig_ObjForEachFanout( p, pObj, pFanout, iFanout, i )
+    {
+        LevelCur = Aig_ObjReverseLevel( p, pFanout );
+        Level = AIG_MAX( Level, LevelCur );
+    }
+    return Level + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares for the computation of required levels.]
+
+  Description [This procedure should be called before the required times
+  are used. It starts internal data structures, which records the level 
+  from the COs of the network nodes in reverse topologogical order.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManStartReverseLevels( Aig_Man_t * p, int nMaxLevelIncrease )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    assert( p->pFanData != NULL );
+    assert( p->vLevelR == NULL );
+    // remember the maximum number of direct levels
+    p->nLevelMax = Aig_ManLevels(p) + nMaxLevelIncrease;
+    // start the reverse levels
+    p->vLevelR = Vec_IntAlloc( 0 );
+    Vec_IntFill( p->vLevelR, Aig_ManObjNumMax(p), 0 );
+    // compute levels in reverse topological order
+    vNodes = Aig_ManDfsReverse( p );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        assert( pObj->fMarkA == 0 );
+        Aig_ObjSetReverseLevel( p, pObj, Aig_ObjReverseLevelNew(p, pObj) );
+    }
+    Vec_PtrFree( vNodes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans the data structures used to compute required levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManStopReverseLevels( Aig_Man_t * p )
+{
+    assert( p->vLevelR != NULL );
+    Vec_IntFree( p->vLevelR );
+    p->vLevelR = NULL;
+    p->nLevelMax = 0;
+
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Incrementally updates level of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManUpdateLevel( Aig_Man_t * p, Aig_Obj_t * pObjNew )
+{
+    Aig_Obj_t * pFanout, * pTemp;
+    int iFanout = -1, LevelOld, Lev, k, m;
+    assert( p->pFanData != NULL );
+    assert( Aig_ObjIsNode(pObjNew) );
+    // allocate level if needed
+    if ( p->vLevels == NULL )
+        p->vLevels = Vec_VecAlloc( Aig_ManLevels(p) + 8 );
+    // check if level has changed
+    LevelOld = Aig_ObjLevel(pObjNew);
+    if ( LevelOld == Aig_ObjLevelNew(pObjNew) )
+        return;
+    // start the data structure for level update
+    // we cannot fail to visit a node when using this structure because the 
+    // nodes are stored by their _old_ levels, which are assumed to be correct
+    Vec_VecClear( p->vLevels );
+    Vec_VecPush( p->vLevels, LevelOld, pObjNew );
+    pObjNew->fMarkA = 1;
+    // recursively update level
+    Vec_VecForEachEntryStart( p->vLevels, pTemp, Lev, k, LevelOld )
+    {
+        pTemp->fMarkA = 0;
+        assert( Aig_ObjLevel(pTemp) == Lev );
+        pTemp->Level = Aig_ObjLevelNew(pTemp);
+        // if the level did not change, no need to check the fanout levels
+        if ( Aig_ObjLevel(pTemp) == Lev )
+            continue;
+        // schedule fanout for level update
+        Aig_ObjForEachFanout( p, pTemp, pFanout, iFanout, m )
+        {
+            if ( Aig_ObjIsNode(pFanout) && !pFanout->fMarkA )
+            {
+                assert( Aig_ObjLevel(pFanout) >= Lev );
+                Vec_VecPush( p->vLevels, Aig_ObjLevel(pFanout), pFanout );
+                pFanout->fMarkA = 1;
+            }
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Incrementally updates level of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManUpdateReverseLevel( Aig_Man_t * p, Aig_Obj_t * pObjNew )
+{
+    Aig_Obj_t * pFanin, * pTemp;
+    int LevelOld, LevFanin, Lev, k;
+    assert( p->vLevelR != NULL );
+    assert( Aig_ObjIsNode(pObjNew) );
+    // allocate level if needed
+    if ( p->vLevels == NULL )
+        p->vLevels = Vec_VecAlloc( Aig_ManLevels(p) + 8 );
+    // check if level has changed
+    LevelOld = Aig_ObjReverseLevel(p, pObjNew);
+    if ( LevelOld == Aig_ObjReverseLevelNew(p, pObjNew) )
+        return;
+    // start the data structure for level update
+    // we cannot fail to visit a node when using this structure because the 
+    // nodes are stored by their _old_ levels, which are assumed to be correct
+    Vec_VecClear( p->vLevels );
+    Vec_VecPush( p->vLevels, LevelOld, pObjNew );
+    pObjNew->fMarkA = 1;
+    // recursively update level
+    Vec_VecForEachEntryStart( p->vLevels, pTemp, Lev, k, LevelOld )
+    {
+        pTemp->fMarkA = 0;
+        LevelOld = Aig_ObjReverseLevel(p, pTemp); 
+        assert( LevelOld == Lev );
+        Aig_ObjSetReverseLevel( p, pTemp, Aig_ObjReverseLevelNew(p, pTemp) );
+        // if the level did not change, to need to check the fanout levels
+        if ( Aig_ObjReverseLevel(p, pTemp) == Lev )
+            continue;
+        // schedule fanins for level update
+        pFanin = Aig_ObjFanin0(pTemp);
+        if ( Aig_ObjIsNode(pFanin) && !pFanin->fMarkA )
+        {
+            LevFanin = Aig_ObjReverseLevel( p, pFanin );
+            assert( LevFanin >= Lev );
+            Vec_VecPush( p->vLevels, LevFanin, pFanin );
+            pFanin->fMarkA = 1;
+        }
+        pFanin = Aig_ObjFanin1(pTemp);
+        if ( Aig_ObjIsNode(pFanin) && !pFanin->fMarkA )
+        {
+            LevFanin = Aig_ObjReverseLevel( p, pFanin );
+            assert( LevFanin >= Lev );
+            Vec_VecPush( p->vLevels, LevFanin, pFanin );
+            pFanin->fMarkA = 1;
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies direct level of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManVerifyLevel( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, Counter = 0;
+    assert( p->pFanData );
+    Aig_ManForEachNode( p, pObj, i )
+        if ( Aig_ObjLevel(pObj) != Aig_ObjLevelNew(pObj) )
+        {
+            printf( "Level of node %6d should be %4d instead of %4d.\n", 
+                pObj->Id, Aig_ObjLevelNew(pObj), Aig_ObjLevel(pObj) );
+            Counter++;
+        }
+    if ( Counter )
+    printf( "Levels of %d nodes are incorrect.\n", Counter );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies reverse level of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManVerifyReverseLevel( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, Counter = 0;
+    assert( p->vLevelR );
+    Aig_ManForEachNode( p, pObj, i )
+        if ( Aig_ObjLevel(pObj) != Aig_ObjLevelNew(pObj) )
+        {
+            printf( "Reverse level of node %6d should be %4d instead of %4d.\n", 
+                pObj->Id, Aig_ObjReverseLevelNew(p, pObj), Aig_ObjReverseLevel(p, pObj) );
+            Counter++;
+        }
+    if ( Counter )
+    printf( "Reverse levels of %d nodes are incorrect.\n", Counter );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigTruth.c b/abc70930/src/aig/aig/aigTruth.c
new file mode 100644
index 00000000..a92f9e1d
--- /dev/null
+++ b/abc70930/src/aig/aig/aigTruth.c
@@ -0,0 +1,98 @@
+/**CFile****************************************************************
+
+  FileName    [aigTruth.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Computes truth table for the cut.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigTruth.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Aig_ManCutTruthOne( Aig_Obj_t * pNode, unsigned * pTruth, int nWords )
+{
+    unsigned * pTruth0, * pTruth1;
+    int i;
+    pTruth0 = Aig_ObjFanin0(pNode)->pData;
+    pTruth1 = Aig_ObjFanin1(pNode)->pData;
+    if ( Aig_ObjIsExor(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] ^ pTruth1[i];
+    else if ( !Aig_ObjFaninC0(pNode) && !Aig_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] & pTruth1[i];
+    else if ( !Aig_ObjFaninC0(pNode) && Aig_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] & ~pTruth1[i];
+    else if ( Aig_ObjFaninC0(pNode) && !Aig_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ~pTruth0[i] & pTruth1[i];
+    else // if ( Aig_ObjFaninC0(pNode) && Aig_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ~pTruth0[i] & ~pTruth1[i];
+    return pTruth;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description [The returned pointer should be used immediately.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Aig_ManCutTruth( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes, Vec_Ptr_t * vTruthElem, Vec_Ptr_t * vTruthStore )
+{
+    Aig_Obj_t * pObj;
+    int i, nWords;
+    assert( Vec_PtrSize(vLeaves) <= Vec_PtrSize(vTruthElem) );
+    assert( Vec_PtrSize(vNodes) <= Vec_PtrSize(vTruthStore) );
+    assert( Vec_PtrSize(vNodes) == 0 || pRoot == Vec_PtrEntryLast(vNodes) );  
+    // assign elementary truth tables
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+        pObj->pData = Vec_PtrEntry( vTruthElem, i );
+    // compute truths for other nodes
+    nWords = Aig_TruthWordNum( Vec_PtrSize(vLeaves) );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        pObj->pData = Aig_ManCutTruthOne( pObj, Vec_PtrEntry(vTruthStore, i), nWords );
+    return pRoot->pData;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigTsim.c b/abc70930/src/aig/aig/aigTsim.c
new file mode 100644
index 00000000..a8a3dda8
--- /dev/null
+++ b/abc70930/src/aig/aig/aigTsim.c
@@ -0,0 +1,436 @@
+/**CFile****************************************************************
+
+  FileName    [aigTsim.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Ternary simulation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigTsim.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+#define TSI_MAX_ROUNDS    1000
+
+#define AIG_XVS0   1
+#define AIG_XVS1   2
+#define AIG_XVSX   3
+
+static inline void Aig_ObjSetXsim( Aig_Obj_t * pObj, int Value )  { pObj->nCuts = Value;  }
+static inline int  Aig_ObjGetXsim( Aig_Obj_t * pObj )             { return pObj->nCuts;   }
+static inline int  Aig_XsimInv( int Value )   
+{ 
+    if ( Value == AIG_XVS0 )
+        return AIG_XVS1;
+    if ( Value == AIG_XVS1 )
+        return AIG_XVS0;
+    assert( Value == AIG_XVSX );       
+    return AIG_XVSX;
+}
+static inline int  Aig_XsimAnd( int Value0, int Value1 )   
+{ 
+    if ( Value0 == AIG_XVS0 || Value1 == AIG_XVS0 )
+        return AIG_XVS0;
+    if ( Value0 == AIG_XVSX || Value1 == AIG_XVSX )
+        return AIG_XVSX;
+    assert( Value0 == AIG_XVS1 && Value1 == AIG_XVS1 );
+    return AIG_XVS1;
+}
+static inline int  Aig_XsimRand2()   
+{
+    return (rand() & 1) ? AIG_XVS1 : AIG_XVS0;
+}
+static inline int  Aig_XsimRand3()   
+{
+    int RetValue;
+    do { 
+        RetValue = rand() & 3; 
+    } while ( RetValue == 0 );
+    return RetValue;
+}
+static inline int  Aig_ObjGetXsimFanin0( Aig_Obj_t * pObj )       
+{ 
+    int RetValue;
+    RetValue = Aig_ObjGetXsim(Aig_ObjFanin0(pObj));
+    return Aig_ObjFaninC0(pObj)? Aig_XsimInv(RetValue) : RetValue;
+}
+static inline int  Aig_ObjGetXsimFanin1( Aig_Obj_t * pObj )       
+{ 
+    int RetValue;
+    RetValue = Aig_ObjGetXsim(Aig_ObjFanin1(pObj));
+    return Aig_ObjFaninC1(pObj)? Aig_XsimInv(RetValue) : RetValue;
+}
+static inline void Aig_XsimPrint( FILE * pFile, int Value )   
+{ 
+    if ( Value == AIG_XVS0 )
+    {
+        fprintf( pFile, "0" );
+        return;
+    }
+    if ( Value == AIG_XVS1 )
+    {
+        fprintf( pFile, "1" );
+        return;
+    }
+    assert( Value == AIG_XVSX );       
+    fprintf( pFile, "x" );
+}
+
+// simulation manager
+typedef struct Aig_Tsi_t_ Aig_Tsi_t;
+struct Aig_Tsi_t_
+{
+    Aig_Man_t *      pAig;              // the original AIG manager
+    // ternary state representation
+    int              nWords;            // the number of words in the states
+    Vec_Ptr_t *      vStates;           // the collection of ternary states
+    Aig_MmFixed_t *  pMem;              // memory for ternary states
+    // hash table for terminary states
+    unsigned **      pBins;
+    int              nBins;
+};
+
+static inline unsigned * Aig_TsiNext( unsigned * pState, int nWords )                      { return *((unsigned **)(pState + nWords));  }
+static inline void       Aig_TsiSetNext( unsigned * pState, int nWords, unsigned * pNext ) { *((unsigned **)(pState + nWords)) = pNext; }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates simulation manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Tsi_t * Aig_TsiStart( Aig_Man_t * pAig )
+{
+    Aig_Tsi_t * p;
+    p = (Aig_Tsi_t *)malloc( sizeof(Aig_Tsi_t) );
+    memset( p, 0, sizeof(Aig_Tsi_t) );
+    p->pAig    = pAig;
+    p->nWords  = Aig_BitWordNum( 2*Aig_ManRegNum(pAig) );
+    p->vStates = Vec_PtrAlloc( 1000 );
+    p->pMem    = Aig_MmFixedStart( sizeof(unsigned) * p->nWords + sizeof(unsigned *), 10000 );
+    p->nBins   = Aig_PrimeCudd(TSI_MAX_ROUNDS/2);
+    p->pBins   = ALLOC( unsigned *, p->nBins );
+    memset( p->pBins, 0, sizeof(unsigned *) * p->nBins );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates simulation manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TsiStop( Aig_Tsi_t * p )
+{
+    Aig_MmFixedStop( p->pMem, 0 );
+    Vec_PtrFree( p->vStates );
+    free( p->pBins );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes hash value of the node using its simulation info.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_TsiStateHash( unsigned * pState, int nWords, int nTableSize )
+{
+    static int s_FPrimes[128] = { 
+        1009, 1049, 1093, 1151, 1201, 1249, 1297, 1361, 1427, 1459, 
+        1499, 1559, 1607, 1657, 1709, 1759, 1823, 1877, 1933, 1997, 
+        2039, 2089, 2141, 2213, 2269, 2311, 2371, 2411, 2467, 2543, 
+        2609, 2663, 2699, 2741, 2797, 2851, 2909, 2969, 3037, 3089, 
+        3169, 3221, 3299, 3331, 3389, 3461, 3517, 3557, 3613, 3671, 
+        3719, 3779, 3847, 3907, 3943, 4013, 4073, 4129, 4201, 4243, 
+        4289, 4363, 4441, 4493, 4549, 4621, 4663, 4729, 4793, 4871, 
+        4933, 4973, 5021, 5087, 5153, 5227, 5281, 5351, 5417, 5471, 
+        5519, 5573, 5651, 5693, 5749, 5821, 5861, 5923, 6011, 6073, 
+        6131, 6199, 6257, 6301, 6353, 6397, 6481, 6563, 6619, 6689, 
+        6737, 6803, 6863, 6917, 6977, 7027, 7109, 7187, 7237, 7309, 
+        7393, 7477, 7523, 7561, 7607, 7681, 7727, 7817, 7877, 7933, 
+        8011, 8039, 8059, 8081, 8093, 8111, 8123, 8147
+    };
+    unsigned uHash;
+    int i;
+    uHash = 0;
+    for ( i = 0; i < nWords; i++ )
+        uHash ^= pState[i] * s_FPrimes[i & 0x7F];
+    return uHash % nTableSize;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts value into the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_TsiStateLookup( Aig_Tsi_t * p, unsigned * pState, int nWords )
+{
+    unsigned * pEntry;
+    int Hash;
+    Hash = Aig_TsiStateHash( pState, nWords, p->nBins );
+    for ( pEntry = p->pBins[Hash]; pEntry; pEntry = Aig_TsiNext(pEntry, nWords) )
+        if ( !memcmp( pEntry, pState, sizeof(unsigned) * nWords ) )
+            return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts value into the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TsiStateInsert( Aig_Tsi_t * p, unsigned * pState, int nWords )
+{
+    int Hash = Aig_TsiStateHash( pState, nWords, p->nBins );
+    assert( !Aig_TsiStateLookup( p, pState, nWords ) );
+    Aig_TsiSetNext( pState, nWords, p->pBins[Hash] );
+    p->pBins[Hash] = pState;    
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts value into the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Aig_TsiStateNew( Aig_Tsi_t * p )
+{
+    unsigned * pState;
+    pState = (unsigned *)Aig_MmFixedEntryFetch( p->pMem );
+    memset( pState, 0, sizeof(unsigned) * p->nWords );
+    Vec_PtrPush( p->vStates, pState );
+    return pState;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts value into the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_TsiStatePrint( Aig_Tsi_t * p, unsigned * pState )
+{
+    int i, Value, nZeros = 0, nOnes = 0, nDcs = 0;
+    for ( i = 0; i < Aig_ManRegNum(p->pAig); i++ )
+    {
+        Value = (Aig_InfoHasBit( pState, 2 * i + 1 ) << 1) | Aig_InfoHasBit( pState, 2 * i );
+        if ( Value == 1 )
+            printf( "0" ), nZeros++;
+        else if ( Value == 2 )
+            printf( "1" ), nOnes++;
+        else if ( Value == 3 )
+            printf( "x" ), nDcs++;
+        else
+            assert( 0 );
+    }
+    printf( " (0=%5d, 1=%5d, x=%5d)\n", nZeros, nOnes, nDcs );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Cycles the circuit to create a new initial state.]
+
+  Description [Simulates the circuit with random input for the given 
+  number of timeframes to get a better initial state.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManTernarySimulate( Aig_Man_t * p, int fVerbose )
+{
+    Aig_Tsi_t * pTsi;
+    Vec_Ptr_t * vMap;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
+    unsigned * pState, * pPrev;
+    int i, k, f, fConstants, Value, nCounter;
+    // allocate the simulation manager
+    pTsi = Aig_TsiStart( p );
+    // initialize the values
+    Aig_ObjSetXsim( Aig_ManConst1(p), AIG_XVS1 );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        Aig_ObjSetXsim( pObj, AIG_XVSX );
+    Aig_ManForEachLoSeq( p, pObj, i )
+        Aig_ObjSetXsim( pObj, AIG_XVS0 );
+    // simulate for the given number of timeframes
+    for ( f = 0; f < TSI_MAX_ROUNDS; f++ )
+    {
+        // collect this state
+        pState = Aig_TsiStateNew( pTsi );
+        Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        {
+            Value = Aig_ObjGetXsim(pObjLo);
+            if ( Value & 1 )
+                Aig_InfoSetBit( pState, 2 * i );
+            if ( Value & 2 )
+                Aig_InfoSetBit( pState, 2 * i + 1 );
+        }
+//        Aig_TsiStatePrint( pTsi, pState );
+        // check if this state exists
+        if ( Aig_TsiStateLookup( pTsi, pState, pTsi->nWords ) )
+            break;
+        // insert this state
+        Aig_TsiStateInsert( pTsi, pState, pTsi->nWords );
+        // simulate internal nodes
+        Aig_ManForEachNode( p, pObj, i )
+            Aig_ObjSetXsim( pObj, Aig_XsimAnd(Aig_ObjGetXsimFanin0(pObj), Aig_ObjGetXsimFanin1(pObj)) );
+        // transfer the latch values
+        Aig_ManForEachLiSeq( p, pObj, i )
+            Aig_ObjSetXsim( pObj, Aig_ObjGetXsimFanin0(pObj) );
+        Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+            Aig_ObjSetXsim( pObjLo, Aig_ObjGetXsim(pObjLi) );
+    }
+    if ( f == TSI_MAX_ROUNDS )
+    {
+        printf( "Aig_ManTernarySimulate(): Did not reach a fixed point after %d iterations (not a bug).\n", TSI_MAX_ROUNDS );
+        Aig_TsiStop( pTsi );
+        return NULL;
+    }
+    // OR all the states
+    pState = Vec_PtrEntry( pTsi->vStates, 0 );
+    Vec_PtrForEachEntry( pTsi->vStates, pPrev, i )
+    {
+        for ( k = 0; k < pTsi->nWords; k++ )
+            pState[k] |= pPrev[k];
+    }
+    // check if there are constants
+    fConstants = 0;
+    if ( 2*Aig_ManRegNum(p) == 32*pTsi->nWords )
+    {
+        for ( i = 0; i < pTsi->nWords; i++ )
+            if ( pState[i] != ~0 )
+                fConstants = 1;
+    }
+    else
+    {
+        for ( i = 0; i < pTsi->nWords - 1; i++ )
+            if ( pState[i] != ~0 )
+                fConstants = 1;
+        if ( pState[i] != Aig_InfoMask( 2*Aig_ManRegNum(p) - 32*(pTsi->nWords-1) ) )
+            fConstants = 1;
+    }
+    if ( fConstants == 0 )
+    {
+        Aig_TsiStop( pTsi );
+        return NULL;
+    }
+
+    // start mapping by adding the true PIs
+    vMap = Vec_PtrAlloc( Aig_ManPiNum(p) );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        Vec_PtrPush( vMap, pObj );
+    // find constant registers
+    nCounter = 0;
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+    {
+        Value = (Aig_InfoHasBit( pState, 2 * i + 1 ) << 1) | Aig_InfoHasBit( pState, 2 * i );
+        nCounter += (Value == 1 || Value == 2);
+        if ( Value == 1 )
+            Vec_PtrPush( vMap, Aig_ManConst0(p) );
+        else if ( Value == 2 )
+            Vec_PtrPush( vMap, Aig_ManConst1(p) );
+        else if ( Value == 3 )
+            Vec_PtrPush( vMap, pObjLo );
+        else
+            assert( 0 );
+//        Aig_XsimPrint( stdout, Value );
+    }
+//    printf( "\n" );
+    Aig_TsiStop( pTsi );
+    if ( fVerbose )
+    printf( "Detected %d constants after %d iterations of ternary simulation.\n", nCounter, f );
+    return vMap;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reduces the circuit using ternary simulation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Aig_ManConstReduce( Aig_Man_t * p, int fVerbose )
+{
+    Aig_Man_t * pTemp;
+    Vec_Ptr_t * vMap;
+    while ( (vMap = Aig_ManTernarySimulate( p, fVerbose )) )
+    {
+        if ( fVerbose )
+        printf( "RBeg = %5d. NBeg = %6d.   ", Aig_ManRegNum(p), Aig_ManNodeNum(p) );
+        p = Aig_ManRemap( pTemp = p, vMap );
+        Aig_ManStop( pTemp );
+        Vec_PtrFree( vMap );
+        Aig_ManSeqCleanup( p );
+        if ( fVerbose )
+        printf( "REnd = %5d. NEnd = %6d.  \n", Aig_ManRegNum(p), Aig_ManNodeNum(p) );
+    }
+    return p;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigUtil.c b/abc70930/src/aig/aig/aigUtil.c
new file mode 100644
index 00000000..b70d11c7
--- /dev/null
+++ b/abc70930/src/aig/aig/aigUtil.c
@@ -0,0 +1,851 @@
+/**CFile****************************************************************
+
+  FileName    [aigUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Various procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function********************************************************************
+
+  Synopsis    [Returns the next prime >= p.]
+
+  Description [Copied from CUDD, for stand-aloneness.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+unsigned int Aig_PrimeCudd( unsigned int p )
+{
+    int i,pn;
+
+    p--;
+    do {
+        p++;
+        if (p&1) {
+        pn = 1;
+        i = 3;
+        while ((unsigned) (i * i) <= p) {
+        if (p % i == 0) {
+            pn = 0;
+            break;
+        }
+        i += 2;
+        }
+    } else {
+        pn = 0;
+    }
+    } while (!pn);
+    return(p);
+
+} /* end of Cudd_Prime */
+
+/**Function*************************************************************
+
+  Synopsis    [Increments the current traversal ID of the network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManIncrementTravId( Aig_Man_t * p )
+{
+    if ( p->nTravIds >= (1<<30)-1 )
+        Aig_ManCleanData( p );
+    p->nTravIds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManLevels( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, LevelMax = 0;
+    Aig_ManForEachPo( p, pObj, i )
+        LevelMax = AIG_MAX( LevelMax, (int)Aig_ObjFanin0(pObj)->Level );
+    return LevelMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reset reference counters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManResetRefs( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        pObj->nRefs = 0;
+    Aig_ManForEachObj( p, pObj, i )
+    {
+        if ( Aig_ObjFanin0(pObj) )
+            Aig_ObjFanin0(pObj)->nRefs++;
+        if ( Aig_ObjFanin1(pObj) )
+            Aig_ObjFanin1(pObj)->nRefs++;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans MarkB.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManCleanMarkA( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        pObj->fMarkA = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans MarkB.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManCleanMarkB( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        pObj->fMarkB = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans the data pointers for the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManCleanData( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p, pObj, i )
+        pObj->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively cleans the data pointers in the cone of the node.]
+
+  Description [Applicable to small AIGs only because no caching is performed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCleanData_rec( Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    assert( !Aig_ObjIsPo(pObj) );
+    if ( Aig_ObjIsAnd(pObj) )
+    {
+        Aig_ObjCleanData_rec( Aig_ObjFanin0(pObj) );
+        Aig_ObjCleanData_rec( Aig_ObjFanin1(pObj) );
+    }
+    pObj->pData = NULL;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Detects multi-input gate rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCollectMulti_rec( Aig_Obj_t * pRoot, Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    if ( pRoot != pObj && (Aig_IsComplement(pObj) || Aig_ObjIsPi(pObj) || Aig_ObjType(pRoot) != Aig_ObjType(pObj)) )
+    {
+        Vec_PtrPushUnique(vSuper, pObj);
+        return;
+    }
+    Aig_ObjCollectMulti_rec( pRoot, Aig_ObjChild0(pObj), vSuper );
+    Aig_ObjCollectMulti_rec( pRoot, Aig_ObjChild1(pObj), vSuper );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Detects multi-input gate rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjCollectMulti( Aig_Obj_t * pRoot, Vec_Ptr_t * vSuper )
+{
+    assert( !Aig_IsComplement(pRoot) );
+    Vec_PtrClear( vSuper );
+    Aig_ObjCollectMulti_rec( pRoot, pRoot, vSuper );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the node is the root of MUX or EXOR/NEXOR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjIsMuxType( Aig_Obj_t * pNode )
+{
+    Aig_Obj_t * pNode0, * pNode1;
+    // check that the node is regular
+    assert( !Aig_IsComplement(pNode) );
+    // if the node is not AND, this is not MUX
+    if ( !Aig_ObjIsAnd(pNode) )
+        return 0;
+    // if the children are not complemented, this is not MUX
+    if ( !Aig_ObjFaninC0(pNode) || !Aig_ObjFaninC1(pNode) )
+        return 0;
+    // get children
+    pNode0 = Aig_ObjFanin0(pNode);
+    pNode1 = Aig_ObjFanin1(pNode);
+    // if the children are not ANDs, this is not MUX
+    if ( !Aig_ObjIsAnd(pNode0) || !Aig_ObjIsAnd(pNode1) )
+        return 0;
+    // otherwise the node is MUX iff it has a pair of equal grandchildren
+    return (Aig_ObjFanin0(pNode0) == Aig_ObjFanin0(pNode1) && (Aig_ObjFaninC0(pNode0) ^ Aig_ObjFaninC0(pNode1))) || 
+           (Aig_ObjFanin0(pNode0) == Aig_ObjFanin1(pNode1) && (Aig_ObjFaninC0(pNode0) ^ Aig_ObjFaninC1(pNode1))) ||
+           (Aig_ObjFanin1(pNode0) == Aig_ObjFanin0(pNode1) && (Aig_ObjFaninC1(pNode0) ^ Aig_ObjFaninC0(pNode1))) ||
+           (Aig_ObjFanin1(pNode0) == Aig_ObjFanin1(pNode1) && (Aig_ObjFaninC1(pNode0) ^ Aig_ObjFaninC1(pNode1)));
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Recognizes what nodes are inputs of the EXOR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ObjRecognizeExor( Aig_Obj_t * pObj, Aig_Obj_t ** ppFan0, Aig_Obj_t ** ppFan1 )
+{
+    Aig_Obj_t * p0, * p1;
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) )
+        return 0;
+    if ( Aig_ObjIsExor(pObj) )
+    {
+        *ppFan0 = Aig_ObjChild0(pObj);
+        *ppFan1 = Aig_ObjChild1(pObj);
+        return 1;
+    }
+    assert( Aig_ObjIsAnd(pObj) );
+    p0 = Aig_ObjChild0(pObj);
+    p1 = Aig_ObjChild1(pObj);
+    if ( !Aig_IsComplement(p0) || !Aig_IsComplement(p1) )
+        return 0;
+    p0 = Aig_Regular(p0);
+    p1 = Aig_Regular(p1);
+    if ( !Aig_ObjIsAnd(p0) || !Aig_ObjIsAnd(p1) )
+        return 0;
+    if ( Aig_ObjFanin0(p0) != Aig_ObjFanin0(p1) || Aig_ObjFanin1(p0) != Aig_ObjFanin1(p1) )
+        return 0;
+    if ( Aig_ObjFaninC0(p0) == Aig_ObjFaninC0(p1) || Aig_ObjFaninC1(p0) == Aig_ObjFaninC1(p1) )
+        return 0;
+    *ppFan0 = Aig_ObjChild0(p0);
+    *ppFan1 = Aig_ObjChild1(p0);
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recognizes what nodes are control and data inputs of a MUX.]
+
+  Description [If the node is a MUX, returns the control variable C.
+  Assigns nodes T and E to be the then and else variables of the MUX. 
+  Node C is never complemented. Nodes T and E can be complemented.
+  This function also recognizes EXOR/NEXOR gates as MUXes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ObjRecognizeMux( Aig_Obj_t * pNode, Aig_Obj_t ** ppNodeT, Aig_Obj_t ** ppNodeE )
+{
+    Aig_Obj_t * pNode0, * pNode1;
+    assert( !Aig_IsComplement(pNode) );
+    assert( Aig_ObjIsMuxType(pNode) );
+    // get children
+    pNode0 = Aig_ObjFanin0(pNode);
+    pNode1 = Aig_ObjFanin1(pNode);
+
+    // find the control variable
+    if ( Aig_ObjFanin1(pNode0) == Aig_ObjFanin1(pNode1) && (Aig_ObjFaninC1(pNode0) ^ Aig_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Aig_ObjFaninC1(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Aig_Not(Aig_ObjChild0(pNode0));//pNode1->p1);
+            return Aig_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Aig_Not(Aig_ObjChild0(pNode1));//pNode2->p1);
+            return Aig_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+    else if ( Aig_ObjFanin0(pNode0) == Aig_ObjFanin0(pNode1) && (Aig_ObjFaninC0(pNode0) ^ Aig_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Aig_ObjFaninC0(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Aig_Not(Aig_ObjChild1(pNode0));//pNode1->p2);
+            return Aig_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Aig_Not(Aig_ObjChild1(pNode1));//pNode2->p2);
+            return Aig_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+    else if ( Aig_ObjFanin0(pNode0) == Aig_ObjFanin1(pNode1) && (Aig_ObjFaninC0(pNode0) ^ Aig_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Aig_ObjFaninC0(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Aig_Not(Aig_ObjChild1(pNode0));//pNode1->p2);
+            return Aig_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Aig_Not(Aig_ObjChild0(pNode1));//pNode2->p1);
+            return Aig_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+    else if ( Aig_ObjFanin1(pNode0) == Aig_ObjFanin0(pNode1) && (Aig_ObjFaninC1(pNode0) ^ Aig_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Aig_ObjFaninC1(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Aig_Not(Aig_ObjChild0(pNode0));//pNode1->p1);
+            return Aig_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Aig_Not(Aig_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Aig_Not(Aig_ObjChild1(pNode1));//pNode2->p2);
+            return Aig_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+    assert( 0 ); // this is not MUX
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Aig_ObjReal_rec( Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pObjNew, * pObjR = Aig_Regular(pObj);
+    if ( !Aig_ObjIsBuf(pObjR) )
+        return pObj;
+    pObjNew = Aig_ObjReal_rec( Aig_ObjChild0(pObjR) );
+    return Aig_NotCond( pObjNew, Aig_IsComplement(pObj) );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints Eqn formula for the AIG rooted at this node.]
+
+  Description [The formula is in terms of PIs, which should have
+  their names assigned in pObj->pData fields.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjPrintEqn( FILE * pFile, Aig_Obj_t * pObj, Vec_Vec_t * vLevels, int Level )
+{
+    Vec_Ptr_t * vSuper;
+    Aig_Obj_t * pFanin;
+    int fCompl, i;
+    // store the complemented attribute
+    fCompl = Aig_IsComplement(pObj);
+    pObj = Aig_Regular(pObj);
+    // constant case
+    if ( Aig_ObjIsConst1(pObj) )
+    {
+        fprintf( pFile, "%d", !fCompl );
+        return;
+    }
+    // PI case
+    if ( Aig_ObjIsPi(pObj) )
+    {
+        fprintf( pFile, "%s%s", fCompl? "!" : "", (char*)pObj->pData );
+        return;
+    }
+    // AND case
+    Vec_VecExpand( vLevels, Level );
+    vSuper = Vec_VecEntry(vLevels, Level);
+    Aig_ObjCollectMulti( pObj, vSuper );
+    fprintf( pFile, "%s", (Level==0? "" : "(") );
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        Aig_ObjPrintEqn( pFile, Aig_NotCond(pFanin, fCompl), vLevels, Level+1 );
+        if ( i < Vec_PtrSize(vSuper) - 1 )
+            fprintf( pFile, " %s ", fCompl? "+" : "*" );
+    }
+    fprintf( pFile, "%s", (Level==0? "" : ")") );
+    return;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints Verilog formula for the AIG rooted at this node.]
+
+  Description [The formula is in terms of PIs, which should have
+  their names assigned in pObj->pData fields.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjPrintVerilog( FILE * pFile, Aig_Obj_t * pObj, Vec_Vec_t * vLevels, int Level )
+{
+    Vec_Ptr_t * vSuper;
+    Aig_Obj_t * pFanin, * pFanin0, * pFanin1, * pFaninC;
+    int fCompl, i;
+    // store the complemented attribute
+    fCompl = Aig_IsComplement(pObj);
+    pObj = Aig_Regular(pObj);
+    // constant case
+    if ( Aig_ObjIsConst1(pObj) )
+    {
+        fprintf( pFile, "1\'b%d", !fCompl );
+        return;
+    }
+    // PI case
+    if ( Aig_ObjIsPi(pObj) )
+    {
+        fprintf( pFile, "%s%s", fCompl? "~" : "", (char*)pObj->pData );
+        return;
+    }
+    // EXOR case
+    if ( Aig_ObjIsExor(pObj) )
+    {
+        Vec_VecExpand( vLevels, Level );
+        vSuper = Vec_VecEntry( vLevels, Level );
+        Aig_ObjCollectMulti( pObj, vSuper );
+        fprintf( pFile, "%s", (Level==0? "" : "(") );
+        Vec_PtrForEachEntry( vSuper, pFanin, i )
+        {
+            Aig_ObjPrintVerilog( pFile, Aig_NotCond(pFanin, (fCompl && i==0)), vLevels, Level+1 );
+            if ( i < Vec_PtrSize(vSuper) - 1 )
+                fprintf( pFile, " ^ " );
+        }
+        fprintf( pFile, "%s", (Level==0? "" : ")") );
+        return;
+    }
+    // MUX case
+    if ( Aig_ObjIsMuxType(pObj) )
+    {
+        if ( Aig_ObjRecognizeExor( pObj, &pFanin0, &pFanin1 ) )
+        {
+            fprintf( pFile, "%s", (Level==0? "" : "(") );
+            Aig_ObjPrintVerilog( pFile, Aig_NotCond(pFanin0, fCompl), vLevels, Level+1 );
+            fprintf( pFile, " ^ " );
+            Aig_ObjPrintVerilog( pFile, pFanin1, vLevels, Level+1 );
+            fprintf( pFile, "%s", (Level==0? "" : ")") );
+        }
+        else 
+        {
+            pFaninC = Aig_ObjRecognizeMux( pObj, &pFanin1, &pFanin0 );
+            fprintf( pFile, "%s", (Level==0? "" : "(") );
+            Aig_ObjPrintVerilog( pFile, pFaninC, vLevels, Level+1 );
+            fprintf( pFile, " ? " );
+            Aig_ObjPrintVerilog( pFile, Aig_NotCond(pFanin1, fCompl), vLevels, Level+1 );
+            fprintf( pFile, " : " );
+            Aig_ObjPrintVerilog( pFile, Aig_NotCond(pFanin0, fCompl), vLevels, Level+1 );
+            fprintf( pFile, "%s", (Level==0? "" : ")") );
+        }
+        return;
+    }
+    // AND case
+    Vec_VecExpand( vLevels, Level );
+    vSuper = Vec_VecEntry(vLevels, Level);
+    Aig_ObjCollectMulti( pObj, vSuper );
+    fprintf( pFile, "%s", (Level==0? "" : "(") );
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        Aig_ObjPrintVerilog( pFile, Aig_NotCond(pFanin, fCompl), vLevels, Level+1 );
+        if ( i < Vec_PtrSize(vSuper) - 1 )
+            fprintf( pFile, " %s ", fCompl? "|" : "&" );
+    }
+    fprintf( pFile, "%s", (Level==0? "" : ")") );
+    return;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ObjPrintVerbose( Aig_Obj_t * pObj, int fHaig )
+{
+    assert( !Aig_IsComplement(pObj) );
+    printf( "Node %p : ", pObj );
+    if ( Aig_ObjIsConst1(pObj) )
+        printf( "constant 1" );
+    else if ( Aig_ObjIsPi(pObj) )
+        printf( "PI" );
+    else
+        printf( "AND( %p%s, %p%s )", 
+            Aig_ObjFanin0(pObj), (Aig_ObjFaninC0(pObj)? "\'" : " "), 
+            Aig_ObjFanin1(pObj), (Aig_ObjFaninC1(pObj)? "\'" : " ") );
+    printf( " (refs = %3d)", Aig_ObjRefs(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManPrintVerbose( Aig_Man_t * p, int fHaig )
+{
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj;
+    int i;
+    printf( "PIs: " );
+    Aig_ManForEachPi( p, pObj, i )
+        printf( " %p", pObj );
+    printf( "\n" );
+    vNodes = Aig_ManDfs( p );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Aig_ObjPrintVerbose( pObj, fHaig ), printf( "\n" );
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Write speculative miter for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDump( Aig_Man_t * p )
+{ 
+    static int Counter = 0;
+    char FileName[20];
+    // dump the logic into a file
+    sprintf( FileName, "aigbug\\%03d.blif", ++Counter );
+    Aig_ManDumpBlif( p, FileName );
+    printf( "Intermediate AIG with %d nodes was written into file \"%s\".\n", Aig_ManNodeNum(p), FileName );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the AIG into the BLIF file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDumpBlif( Aig_Man_t * p, char * pFileName )
+{
+    FILE * pFile;
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo, * pConst1 = NULL;
+    int i, nDigits, Counter = 0;
+    if ( Aig_ManPoNum(p) == 0 )
+    {
+        printf( "Aig_ManDumpBlif(): AIG manager does not have POs.\n" );
+        return;
+    }
+    // collect nodes in the DFS order
+    vNodes = Aig_ManDfs( p );
+    // assign IDs to objects
+    Aig_ManConst1(p)->iData = Counter++;
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->iData = Counter++;
+    Aig_ManForEachPo( p, pObj, i )
+        pObj->iData = Counter++;
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        pObj->iData = Counter++;
+    nDigits = Aig_Base10Log( Counter );
+    // write the file
+    pFile = fopen( pFileName, "w" );
+    fprintf( pFile, "# BLIF file written by procedure Aig_ManDumpBlif()\n" );
+//    fprintf( pFile, "# http://www.eecs.berkeley.edu/~alanmi/abc/\n" );
+    fprintf( pFile, ".model test\n" );
+    // write PIs
+    fprintf( pFile, ".inputs" );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        fprintf( pFile, " n%0*d", nDigits, pObj->iData );
+    fprintf( pFile, "\n" );
+    // write POs
+    fprintf( pFile, ".outputs" );
+    Aig_ManForEachPoSeq( p, pObj, i )
+        fprintf( pFile, " n%0*d", nDigits, pObj->iData );
+    fprintf( pFile, "\n" );
+    // write latches
+    if ( Aig_ManRegNum(p) )
+    {
+    fprintf( pFile, "\n" );
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        fprintf( pFile, ".latch n%0*d n%0*d 0\n", nDigits, pObjLi->iData, nDigits, pObjLo->iData );
+    fprintf( pFile, "\n" );
+    }
+    // write nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        fprintf( pFile, ".names n%0*d n%0*d n%0*d\n", 
+            nDigits, Aig_ObjFanin0(pObj)->iData, 
+            nDigits, Aig_ObjFanin1(pObj)->iData, 
+            nDigits, pObj->iData );
+        fprintf( pFile, "%d%d 1\n", !Aig_ObjFaninC0(pObj), !Aig_ObjFaninC1(pObj) );
+    }
+    // write POs
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        fprintf( pFile, ".names n%0*d n%0*d\n", 
+            nDigits, Aig_ObjFanin0(pObj)->iData, 
+            nDigits, pObj->iData );
+        fprintf( pFile, "%d 1\n", !Aig_ObjFaninC0(pObj) );
+        if ( Aig_ObjIsConst1(Aig_ObjFanin0(pObj)) )
+            pConst1 = Aig_ManConst1(p);
+    }
+    if ( pConst1 )
+        fprintf( pFile, ".names n%0*d\n 1\n", nDigits, pConst1->iData );
+    fprintf( pFile, ".end\n\n" );
+    fclose( pFile );
+    Vec_PtrFree( vNodes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the AIG into the BLIF file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManDumpVerilog( Aig_Man_t * p, char * pFileName )
+{
+    FILE * pFile;
+    Vec_Ptr_t * vNodes;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo, * pConst1 = NULL;
+    int i, nDigits, Counter = 0;
+    if ( Aig_ManPoNum(p) == 0 )
+    {
+        printf( "Aig_ManDumpBlif(): AIG manager does not have POs.\n" );
+        return;
+    }
+    // collect nodes in the DFS order
+    vNodes = Aig_ManDfs( p );
+    // assign IDs to objects
+    Aig_ManConst1(p)->iData = Counter++;
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->iData = Counter++;
+    Aig_ManForEachPo( p, pObj, i )
+        pObj->iData = Counter++;
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        pObj->iData = Counter++;
+    nDigits = Aig_Base10Log( Counter );
+    // write the file
+    pFile = fopen( pFileName, "w" );
+    fprintf( pFile, "// Verilog file written by procedure Aig_ManDumpVerilog()\n" );
+//    fprintf( pFile, "// http://www.eecs.berkeley.edu/~alanmi/abc/\n" );
+    if ( Aig_ManRegNum(p) )
+        fprintf( pFile, "module %s ( clock", p->pName? p->pName: "test" );
+    else
+        fprintf( pFile, "module %s (", p->pName? p->pName: "test" );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        fprintf( pFile, "%s n%0*d", ((Aig_ManRegNum(p) || i)? ",":""), nDigits, pObj->iData );
+    Aig_ManForEachPoSeq( p, pObj, i )
+        fprintf( pFile, ", n%0*d", nDigits, pObj->iData );
+    fprintf( pFile, " );\n" );
+
+    // write PIs
+    if ( Aig_ManRegNum(p) )
+        fprintf( pFile, "input clock;\n" );
+    Aig_ManForEachPiSeq( p, pObj, i )
+        fprintf( pFile, "input n%0*d;\n", nDigits, pObj->iData );
+    // write POs
+    Aig_ManForEachPoSeq( p, pObj, i )
+        fprintf( pFile, "output n%0*d;\n", nDigits, pObj->iData );
+    // write latches
+    if ( Aig_ManRegNum(p) )
+    {
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        fprintf( pFile, "reg n%0*d;\n", nDigits, pObjLo->iData );
+    Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        fprintf( pFile, "wire n%0*d;\n", nDigits, pObjLi->iData );
+    }
+    // write nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        fprintf( pFile, "wire n%0*d;\n", nDigits, pObj->iData );
+    // write nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        fprintf( pFile, "assign n%0*d = %sn%0*d & %sn%0*d;\n", 
+            nDigits, pObj->iData,
+            !Aig_ObjFaninC0(pObj) ? " " : "~", nDigits, Aig_ObjFanin0(pObj)->iData, 
+            !Aig_ObjFaninC1(pObj) ? " " : "~", nDigits, Aig_ObjFanin1(pObj)->iData
+            );
+    }
+    // write POs
+    Aig_ManForEachPoSeq( p, pObj, i )
+    {
+        fprintf( pFile, "assign n%0*d = %sn%0*d;\n", 
+            nDigits, pObj->iData,
+            !Aig_ObjFaninC0(pObj) ? " " : "~", nDigits, Aig_ObjFanin0(pObj)->iData );
+        if ( Aig_ObjIsConst1(Aig_ObjFanin0(pObj)) )
+            pConst1 = Aig_ManConst1(p);
+    }
+    if ( Aig_ManRegNum(p) )
+    {
+        Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+        {
+            fprintf( pFile, "assign n%0*d = %sn%0*d;\n", 
+                nDigits, pObjLi->iData,
+                !Aig_ObjFaninC0(pObjLi) ? " " : "~", nDigits, Aig_ObjFanin0(pObjLi)->iData );
+            if ( Aig_ObjIsConst1(Aig_ObjFanin0(pObjLi)) )
+                pConst1 = Aig_ManConst1(p);
+        }
+    }
+    if ( pConst1 )
+        fprintf( pFile, "assign n%0*d = 1\'b1;\n", nDigits, pConst1->iData );
+
+    // write initial state
+    if ( Aig_ManRegNum(p) )
+    {
+        Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+            fprintf( pFile, "always @ (posedge clock) begin n%0*d <= n%0*d; end\n", 
+                 nDigits, pObjLo->iData,
+                 nDigits, pObjLi->iData );
+        Aig_ManForEachLiLoSeq( p, pObjLi, pObjLo, i )
+            fprintf( pFile, "initial begin n%0*d <= 1\'b0; end\n", 
+                 nDigits, pObjLo->iData );
+    }
+
+    fprintf( pFile, "endmodule\n\n" );
+    fclose( pFile );
+    Vec_PtrFree( vNodes );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aigWin.c b/abc70930/src/aig/aig/aigWin.c
new file mode 100644
index 00000000..0485b243
--- /dev/null
+++ b/abc70930/src/aig/aig/aigWin.c
@@ -0,0 +1,184 @@
+/**CFile****************************************************************
+
+  FileName    [aigWin.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [Window computation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aigWin.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluate the cost of removing the node from the set of leaves.]
+
+  Description [Returns the number of new leaves that will be brought in.
+  Returns large number if the node cannot be removed from the set of leaves.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Aig_NodeGetLeafCostOne( Aig_Obj_t * pNode, int nFanoutLimit )
+{
+    int Cost;
+    // make sure the node is in the construction zone
+    assert( pNode->fMarkA );  
+    // cannot expand over the PI node
+    if ( Aig_ObjIsPi(pNode) )
+        return 999;
+    // get the cost of the cone
+    Cost = (!Aig_ObjFanin0(pNode)->fMarkA) + (!Aig_ObjFanin1(pNode)->fMarkA);
+    // always accept if the number of leaves does not increase
+    if ( Cost < 2 )
+        return Cost;
+    // skip nodes with many fanouts
+    if ( (int)pNode->nRefs > nFanoutLimit )
+        return 999;
+    // return the number of nodes that will be on the leaves if this node is removed
+    return Cost;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Builds reconvergence-driven cut by changing one leaf at a time.]
+
+  Description [This procedure looks at the current leaves and tries to change 
+  one leaf at a time in such a way that the cut grows as little as possible.
+  In evaluating the fanins, this procedure looks only at their immediate 
+  predecessors (this is why it is called a one-level construction procedure).]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManFindCut_int( Vec_Ptr_t * vFront, Vec_Ptr_t * vVisited, int nSizeLimit, int nFanoutLimit )
+{
+    Aig_Obj_t * pNode, * pFaninBest, * pNext;
+    int CostBest, CostCur, i;
+    // find the best fanin
+    CostBest   = 100;
+    pFaninBest = NULL;
+//printf( "Evaluating fanins of the cut:\n" );
+    Vec_PtrForEachEntry( vFront, pNode, i )
+    {
+        CostCur = Aig_NodeGetLeafCostOne( pNode, nFanoutLimit );
+//printf( "    Fanin %s has cost %d.\n", Aig_ObjName(pNode), CostCur );
+        if ( CostBest > CostCur ||
+            (CostBest == CostCur && pNode->Level > pFaninBest->Level) )
+        {
+            CostBest   = CostCur;
+            pFaninBest = pNode;
+        }
+        if ( CostBest == 0 )
+            break;
+    }
+    if ( pFaninBest == NULL )
+        return 0;
+    assert( CostBest < 3 );
+    if ( Vec_PtrSize(vFront) - 1 + CostBest > nSizeLimit )
+        return 0;
+    assert( Aig_ObjIsNode(pFaninBest) );
+    // remove the node from the array
+    Vec_PtrRemove( vFront, pFaninBest );
+//printf( "Removing fanin %s.\n", Aig_ObjName(pFaninBest) );
+
+    // add the left child to the fanins
+    pNext = Aig_ObjFanin0(pFaninBest);
+    if ( !pNext->fMarkA )
+    {
+//printf( "Adding fanin %s.\n", Aig_ObjName(pNext) );
+        pNext->fMarkA = 1;
+        Vec_PtrPush( vFront, pNext );
+        Vec_PtrPush( vVisited, pNext );
+    }
+    // add the right child to the fanins
+    pNext = Aig_ObjFanin1(pFaninBest);
+    if ( !pNext->fMarkA )
+    {
+//printf( "Adding fanin %s.\n", Aig_ObjName(pNext) );
+        pNext->fMarkA = 1;
+        Vec_PtrPush( vFront, pNext );
+        Vec_PtrPush( vVisited, pNext );
+    }
+    assert( Vec_PtrSize(vFront) <= nSizeLimit );
+    // keep doing this
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes one sequential cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_ManFindCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vFront, Vec_Ptr_t * vVisited, int nSizeLimit, int nFanoutLimit )
+{
+    Aig_Obj_t * pNode;
+    int i;
+
+    assert( !Aig_IsComplement(pRoot) );
+    assert( Aig_ObjIsNode(pRoot) );
+    assert( Aig_ObjChild0(pRoot) );
+    assert( Aig_ObjChild1(pRoot) );
+
+    // start the cut 
+    Vec_PtrClear( vFront );
+    Vec_PtrPush( vFront, Aig_ObjFanin0(pRoot) );
+    Vec_PtrPush( vFront, Aig_ObjFanin1(pRoot) );
+
+    // start the visited nodes
+    Vec_PtrClear( vVisited );
+    Vec_PtrPush( vVisited, pRoot );
+    Vec_PtrPush( vVisited, Aig_ObjFanin0(pRoot) );
+    Vec_PtrPush( vVisited, Aig_ObjFanin1(pRoot) );
+
+    // mark these nodes
+    assert( !pRoot->fMarkA );
+    assert( !Aig_ObjFanin0(pRoot)->fMarkA );
+    assert( !Aig_ObjFanin1(pRoot)->fMarkA );
+    pRoot->fMarkA = 1;
+    Aig_ObjFanin0(pRoot)->fMarkA = 1;
+    Aig_ObjFanin1(pRoot)->fMarkA = 1;
+
+    // compute the cut
+    while ( Aig_ManFindCut_int( vFront, vVisited, nSizeLimit, nFanoutLimit ) );
+    assert( Vec_PtrSize(vFront) <= nSizeLimit );
+
+    // clean the visit markings
+    Vec_PtrForEachEntry( vVisited, pNode, i )
+        pNode->fMarkA = 0;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/aig_.c b/abc70930/src/aig/aig/aig_.c
new file mode 100644
index 00000000..b2313d35
--- /dev/null
+++ b/abc70930/src/aig/aig/aig_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [aig_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: aig_.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/aig/module.make b/abc70930/src/aig/aig/module.make
new file mode 100644
index 00000000..c35e7121
--- /dev/null
+++ b/abc70930/src/aig/aig/module.make
@@ -0,0 +1,21 @@
+SRC +=    src/aig/aig/aigCheck.c \
+    src/aig/aig/aigDfs.c \
+    src/aig/aig/aigFanout.c \
+    src/aig/aig/aigMan.c \
+    src/aig/aig/aigMem.c \
+    src/aig/aig/aigMffc.c \
+    src/aig/aig/aigObj.c \
+    src/aig/aig/aigOper.c \
+    src/aig/aig/aigOrder.c \
+    src/aig/aig/aigPart.c \
+    src/aig/aig/aigRepr.c \
+    src/aig/aig/aigRet.c \
+    src/aig/aig/aigScl.c \
+    src/aig/aig/aigSeq.c \
+    src/aig/aig/aigTable.c \
+    src/aig/aig/aigTime.c \
+    src/aig/aig/aigTiming.c \
+    src/aig/aig/aigTruth.c \
+    src/aig/aig/aigTsim.c \
+    src/aig/aig/aigUtil.c \
+    src/aig/aig/aigWin.c
\ No newline at end of file
diff --git a/abc70930/src/aig/bar/bar.c b/abc70930/src/aig/bar/bar.c
new file mode 100644
index 00000000..8c215b48
--- /dev/null
+++ b/abc70930/src/aig/bar/bar.c
@@ -0,0 +1,177 @@
+/**CFile****************************************************************
+
+  FileName    [bar.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [extra]
+
+  Synopsis    [Progress bar.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bar.c,v 1.0 2003/02/01 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "bar.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+struct Bar_Progress_t_
+{
+    int              nItemsNext;   // the number of items for the next update of the progress bar
+    int              nItemsTotal;  // the total number of items
+    int              posTotal;     // the total number of positions
+    int              posCur;       // the current position
+    FILE *           pFile;        // the output stream 
+};
+
+static void Bar_ProgressShow( Bar_Progress_t * p, char * pString );
+static void Bar_ProgressClean( Bar_Progress_t * p );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the progress bar.]
+
+  Description [The first parameter is the output stream (pFile), where
+  the progress is printed. The current printing position should be the
+  first one on the given line. The second parameters is the total
+  number of items that correspond to 100% position of the progress bar.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bar_Progress_t * Bar_ProgressStart( FILE * pFile, int nItemsTotal )
+{
+    Bar_Progress_t * p;
+//    extern int Abc_FrameShowProgress( void * p );
+//    extern void * Abc_FrameGetGlobalFrame();
+//    if ( !Abc_FrameShowProgress(Abc_FrameGetGlobalFrame()) ) return NULL;
+    p = (Bar_Progress_t *) malloc(sizeof(Bar_Progress_t));
+    memset( p, 0, sizeof(Bar_Progress_t) );
+    p->pFile       = pFile;
+    p->nItemsTotal = nItemsTotal;
+    p->posTotal    = 78;
+    p->posCur      = 1;
+    p->nItemsNext  = (int)((7.0+p->posCur)*p->nItemsTotal/p->posTotal);
+    Bar_ProgressShow( p, NULL );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the progress bar.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bar_ProgressUpdate_int( Bar_Progress_t * p, int nItemsCur, char * pString )
+{
+    if ( p == NULL ) return;
+    if ( nItemsCur < p->nItemsNext )
+        return;
+    if ( nItemsCur >= p->nItemsTotal )
+    {
+        p->posCur = 78;
+        p->nItemsNext = 0x7FFFFFFF;
+    }
+    else
+    {
+        p->posCur += 7;
+        p->nItemsNext = (int)((7.0+p->posCur)*p->nItemsTotal/p->posTotal);
+    }
+    Bar_ProgressShow( p, pString );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the progress bar.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bar_ProgressStop( Bar_Progress_t * p )
+{
+    if ( p == NULL ) return;
+    Bar_ProgressClean( p );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the progress bar of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bar_ProgressShow( Bar_Progress_t * p, char * pString )
+{
+    int i;
+    if ( p == NULL ) return;
+    if ( pString )
+        fprintf( p->pFile, "%s ", pString );
+    for ( i = (pString? strlen(pString) + 1 : 0); i < p->posCur; i++ )
+        fprintf( p->pFile, "-" );
+    if ( i == p->posCur )
+        fprintf( p->pFile, ">" );
+    for ( i++  ; i <= p->posTotal; i++ )
+        fprintf( p->pFile, " " );
+    fprintf( p->pFile, "\r" );
+    fflush( stdout );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans the progress bar before quitting.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bar_ProgressClean( Bar_Progress_t * p )
+{
+    int i;
+    if ( p == NULL ) return;
+    for ( i = 0; i <= p->posTotal; i++ )
+        fprintf( p->pFile, " " );
+    fprintf( p->pFile, "\r" );
+    fflush( stdout );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/bar/bar.h b/abc70930/src/aig/bar/bar.h
new file mode 100644
index 00000000..814fbe6f
--- /dev/null
+++ b/abc70930/src/aig/bar/bar.h
@@ -0,0 +1,74 @@
+/**CFile****************************************************************
+
+  FileName    [bar.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Progress bar.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: bar.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __BAR_H__
+#define __BAR_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef _WIN32
+#define inline __inline // compatible with MS VS 6.0
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+#define BAR_PROGRESS_USE   1
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+ 
+typedef struct Bar_Progress_t_ Bar_Progress_t;
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== bar.c ==========================================================*/
+extern Bar_Progress_t *  Bar_ProgressStart( FILE * pFile, int nItemsTotal );
+extern void              Bar_ProgressStop( Bar_Progress_t * p );
+extern void              Bar_ProgressUpdate_int( Bar_Progress_t * p, int nItemsCur, char * pString );
+
+static inline void       Bar_ProgressUpdate( Bar_Progress_t * p, int nItemsCur, char * pString ) {  
+    if ( BAR_PROGRESS_USE && p && (nItemsCur < *((int*)p)) ) return; Bar_ProgressUpdate_int(p, nItemsCur, pString); }
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/bar/module.make b/abc70930/src/aig/bar/module.make
new file mode 100644
index 00000000..26161ba1
--- /dev/null
+++ b/abc70930/src/aig/bar/module.make
@@ -0,0 +1 @@
+SRC +=    src/aig/bar/bar.c 
diff --git a/abc70930/src/aig/bdc/bdc.h b/abc70930/src/aig/bdc/bdc.h
new file mode 100644
index 00000000..71875edb
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdc.h
@@ -0,0 +1,73 @@
+/**CFile****************************************************************
+
+  FileName    [bdc.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 30, 2007.]
+
+  Revision    [$Id: bdc.h,v 1.00 2007/01/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __BDC_H__
+#define __BDC_H__
+ 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Bdc_Man_t_ Bdc_Man_t;
+typedef struct Bdc_Par_t_ Bdc_Par_t;
+struct Bdc_Par_t_
+{
+    // general parameters
+    int           nVarsMax;      // the maximum support
+    int           fVerbose;      // enable basic stats
+    int           fVeryVerbose;  // enable detailed stats
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== bdcCore.c ==========================================================*/
+extern Bdc_Man_t * Bdc_ManAlloc( Bdc_Par_t * pPars );
+extern void        Bdc_ManFree( Bdc_Man_t * p );
+extern int         Bdc_ManDecompose( Bdc_Man_t * p, unsigned * puFunc, unsigned * puCare, int nVars, Vec_Ptr_t * vDivs, int nNodesLimit );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/bdc/bdcCore.c b/abc70930/src/aig/bdc/bdcCore.c
new file mode 100644
index 00000000..157927b1
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdcCore.c
@@ -0,0 +1,189 @@
+/**CFile****************************************************************
+
+  FileName    [bdcCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    [The gateway to bi-decomposition.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 30, 2007.]
+
+  Revision    [$Id: bdcCore.c,v 1.00 2007/01/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bdcInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocate resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bdc_Man_t * Bdc_ManAlloc( Bdc_Par_t * pPars )
+{
+    Bdc_Man_t * p;
+    unsigned * pData;
+    int i, k, nBits;
+    p = ALLOC( Bdc_Man_t, 1 );
+    memset( p, 0, sizeof(Bdc_Man_t) );
+    assert( pPars->nVarsMax > 3 && pPars->nVarsMax < 16 );
+    p->pPars = pPars;
+    p->nWords = Kit_TruthWordNum( pPars->nVarsMax );
+    p->nDivsLimit = 200;
+    p->nNodesLimit = 0; // will be set later
+    // memory
+    p->vMemory = Vec_IntStart( 1 << 16 );
+    // internal nodes
+    p->nNodesAlloc = 512;
+    p->pNodes = ALLOC( Bdc_Fun_t, p->nNodesAlloc );
+    // set up hash table
+    p->nTableSize = (1 << p->pPars->nVarsMax);
+    p->pTable = ALLOC( Bdc_Fun_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Bdc_Fun_t *) * p->nTableSize );
+    p->vSpots = Vec_IntAlloc( 256 );
+    // truth tables
+    p->vTruths = Vec_PtrAllocSimInfo( pPars->nVarsMax + 5, p->nWords );
+    // set elementary truth tables
+    nBits = (1 << pPars->nVarsMax);
+    Kit_TruthFill( Vec_PtrEntry(p->vTruths, 0), p->nVars );
+    for ( k = 0; k < pPars->nVarsMax; k++ )
+    {
+        pData = Vec_PtrEntry( p->vTruths, k+1 );
+        Kit_TruthClear( pData, p->nVars );
+        for ( i = 0; i < nBits; i++ )
+            if ( i & (1 << k) )
+                pData[i>>5] |= (1 << (i&31));
+    }
+    p->puTemp1 = Vec_PtrEntry( p->vTruths, pPars->nVarsMax + 1 );
+    p->puTemp2 = Vec_PtrEntry( p->vTruths, pPars->nVarsMax + 2 );
+    p->puTemp3 = Vec_PtrEntry( p->vTruths, pPars->nVarsMax + 3 );
+    p->puTemp4 = Vec_PtrEntry( p->vTruths, pPars->nVarsMax + 4 );
+    // start the internal ISFs
+    p->pIsfOL = &p->IsfOL;  Bdc_IsfStart( p, p->pIsfOL );
+    p->pIsfOR = &p->IsfOR;  Bdc_IsfStart( p, p->pIsfOR );
+    p->pIsfAL = &p->IsfAL;  Bdc_IsfStart( p, p->pIsfAL );
+    p->pIsfAR = &p->IsfAR;  Bdc_IsfStart( p, p->pIsfAR );   
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocate resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bdc_ManFree( Bdc_Man_t * p )
+{
+    Vec_IntFree( p->vMemory );
+    Vec_IntFree( p->vSpots );
+    Vec_PtrFree( p->vTruths );
+    free( p->pNodes );
+    free( p->pTable );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Clears the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bdc_ManPrepare( Bdc_Man_t * p, Vec_Ptr_t * vDivs )
+{
+    unsigned * puTruth;
+    Bdc_Fun_t * pNode;
+    int i;
+    Bdc_TableClear( p );
+    Vec_IntClear( p->vMemory );
+    // add constant 1 and elementary vars
+    p->nNodes = p->nNodesNew = 0;
+    for ( i = 0; i <= p->pPars->nVarsMax; i++ )
+    {
+        pNode = Bdc_FunNew( p );
+        pNode->Type = BDC_TYPE_PI;
+        pNode->puFunc = Vec_PtrEntry( p->vTruths, i );
+        pNode->uSupp = i? (1 << (i-1)) : 0;
+        Bdc_TableAdd( p, pNode );
+    }
+    // add the divisors
+    Vec_PtrForEachEntry( vDivs, puTruth, i )
+    {
+        pNode = Bdc_FunNew( p );
+        pNode->Type = BDC_TYPE_PI;
+        pNode->puFunc = puTruth;
+        pNode->uSupp = Kit_TruthSupport( puTruth, p->nVars );
+        Bdc_TableAdd( p, pNode );
+        if ( i == p->nDivsLimit )
+            break;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of one function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_ManDecompose( Bdc_Man_t * p, unsigned * puFunc, unsigned * puCare, int nVars, Vec_Ptr_t * vDivs, int nNodesMax )
+{
+    Bdc_Isf_t Isf, * pIsf = &Isf;
+    // set current manager parameters
+    p->nVars = nVars;
+    p->nWords = Kit_TruthWordNum( nVars );
+    Bdc_ManPrepare( p, vDivs );
+    p->nNodesLimit = (p->nNodes + nNodesMax < p->nNodesAlloc)? p->nNodes + nNodesMax : p->nNodesAlloc;
+    // copy the function
+    Bdc_IsfStart( p, pIsf );
+    Bdc_IsfClean( pIsf );
+    pIsf->uSupp = Kit_TruthSupport( puFunc, p->nVars ) | Kit_TruthSupport( puCare, p->nVars );
+    Kit_TruthAnd( pIsf->puOn, puCare, puFunc, p->nVars );
+    Kit_TruthSharp( pIsf->puOff, puCare, puFunc, p->nVars );
+    // call decomposition
+    Bdc_SuppMinimize( p, pIsf );
+    p->pRoot = Bdc_ManDecompose_rec( p, pIsf );
+    if ( p->pRoot == NULL )
+        return -1;
+    return p->nNodesNew;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/bdc/bdcDec.c b/abc70930/src/aig/bdc/bdcDec.c
new file mode 100644
index 00000000..747fcb14
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdcDec.c
@@ -0,0 +1,461 @@
+/**CFile****************************************************************
+
+  FileName    [bdcDec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    [Decomposition procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 30, 2007.]
+
+  Revision    [$Id: bdcDec.c,v 1.00 2007/01/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bdcInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Bdc_Type_t Bdc_DecomposeStep( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR );
+static int        Bdc_DecomposeUpdateRight( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR, unsigned * puTruth, Bdc_Type_t Type );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs one step of bi-decomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bdc_Fun_t * Bdc_ManDecompose_rec( Bdc_Man_t * p, Bdc_Isf_t * pIsf )
+{
+    Bdc_Fun_t * pFunc;
+    Bdc_Isf_t IsfL, * pIsfL = &IsfL;
+    Bdc_Isf_t IsfB, * pIsfR = &IsfB;
+    // check computed results
+    if ( pFunc = Bdc_TableLookup( p, pIsf ) )
+        return pFunc;
+    // decide on the decomposition type
+    pFunc = Bdc_FunNew( p );
+    if ( pFunc == NULL )
+        return NULL;
+    pFunc->Type = Bdc_DecomposeStep( p, pIsf, pIsfL, pIsfR );
+    // decompose the left branch
+    pFunc->pFan0 = Bdc_ManDecompose_rec( p, pIsfL );
+    if ( pFunc->pFan0 == NULL )
+        return NULL;
+    // decompose the right branch
+    if ( Bdc_DecomposeUpdateRight( p, pIsf, pIsfL, pIsfR, pFunc->pFan0->puFunc, pFunc->Type ) )
+    {
+        p->nNodes--;
+        return pFunc->pFan0;
+    }
+    pFunc->pFan1 = Bdc_ManDecompose_rec( p, pIsfL );
+    if ( pFunc->pFan1 == NULL )
+        return NULL;
+    // compute the function of node
+    pFunc->puFunc = (unsigned *)Vec_IntFetch(p->vMemory, p->nWords); 
+    if ( pFunc->Type == BDC_TYPE_AND )
+        Kit_TruthAnd( pFunc->puFunc, pFunc->pFan0->puFunc, pFunc->pFan1->puFunc, p->nVars );
+    else if ( pFunc->Type == BDC_TYPE_OR )
+        Kit_TruthOr( pFunc->puFunc, pFunc->pFan0->puFunc, pFunc->pFan1->puFunc, p->nVars );
+    else 
+        assert( 0 );
+    // verify correctness
+    assert( Bdc_TableCheckContainment(p, pIsf, pFunc->puFunc) );
+    // convert from OR to AND
+    if ( pFunc->Type == BDC_TYPE_OR )
+    {
+        pFunc->Type = BDC_TYPE_AND;
+        pFunc->pFan0 = Bdc_Not(pFunc->pFan0);
+        pFunc->pFan1 = Bdc_Not(pFunc->pFan1);
+        Kit_TruthNot( pFunc->puFunc, pFunc->puFunc, p->nVars );
+        pFunc = Bdc_Not(pFunc);
+    }
+    Bdc_TableAdd( p, Bdc_Regular(pFunc) );
+    return pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the ISF of the right after the left was decompoosed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_DecomposeUpdateRight( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR, unsigned * puTruth, Bdc_Type_t Type )
+{
+    if ( Type == BDC_TYPE_OR ) 
+    {
+//        Right.Q = bdd_appex( Q, CompSpecLeftF, bddop_diff, setRightRes );
+//        Right.R = bdd_exist( R, setRightRes );
+
+//        if ( pR->Q )  Cudd_RecursiveDeref( dd, pR->Q );
+//        if ( pR->R )  Cudd_RecursiveDeref( dd, pR->R );
+//        pR->Q = Cudd_bddAndAbstract( dd, pF->Q, Cudd_Not(CompSpecF), pL->V );    Cudd_Ref( pR->Q );
+//        pR->R = Cudd_bddExistAbstract( dd, pF->R, pL->V );                      Cudd_Ref( pR->R );
+
+//        assert( pR->R != b0 );
+//        return (int)( pR->Q == b0 );
+
+        Kit_TruthSharp( pIsfR->puOn, pIsf->puOn, puTruth, p->nVars );
+        Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp ); 
+        Kit_TruthExistSet( pIsfR->puOff, pIsf->puOff, p->nVars, pIsfL->uSupp ); 
+        assert( !Kit_TruthIsConst0(pIsfR->puOff, p->nVars) );
+        return Kit_TruthIsConst0(pIsfR->puOn, p->nVars);
+    }
+    else if ( Type == BDC_TYPE_AND )
+    {
+//        Right.R = bdd_appex( R, CompSpecLeftF, bddop_and, setRightRes );
+//        Right.Q = bdd_exist( Q, setRightRes );
+
+//        if ( pR->Q )  Cudd_RecursiveDeref( dd, pR->Q );
+//        if ( pR->R )  Cudd_RecursiveDeref( dd, pR->R );
+//        pR->R = Cudd_bddAndAbstract( dd, pF->R, CompSpecF, pL->V );                Cudd_Ref( pR->R );
+//        pR->Q = Cudd_bddExistAbstract( dd, pF->Q, pL->V );                      Cudd_Ref( pR->Q );
+
+//        assert( pR->Q != b0 );
+//        return (int)( pR->R == b0 );
+
+        Kit_TruthSharp( pIsfR->puOn, pIsf->puOn, puTruth, p->nVars );
+        Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp ); 
+        Kit_TruthExistSet( pIsfR->puOff, pIsf->puOff, p->nVars, pIsfL->uSupp ); 
+        assert( !Kit_TruthIsConst0(pIsfR->puOff, p->nVars) );
+        return Kit_TruthIsConst0(pIsfR->puOn, p->nVars);
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks existence of OR-bidecomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Bdc_DecomposeGetCost( Bdc_Man_t * p, int nLeftVars, int nRightVars )
+{
+    assert( nLeftVars > 0 );
+    assert( nRightVars > 0 );
+    // compute the decomposition coefficient
+    if ( nLeftVars >= nRightVars )
+        return BDC_SCALE * (p->nVars * nRightVars + nLeftVars);
+    else // if ( nLeftVars < nRightVars )
+        return BDC_SCALE * (p->nVars * nLeftVars + nRightVars);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks existence of weak OR-bidecomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_DecomposeFindInitialVarSet( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR )
+{
+    char pVars[16];
+    int v, nVars, Beg, End;
+
+    assert( pIsfL->uSupp == 0 );
+    assert( pIsfR->uSupp == 0 );
+
+    // fill in the variables
+    nVars = 0;
+    for ( v = 0; v < p->nVars; v++ )
+        if ( pIsf->uSupp & (1 << v) )
+            pVars[nVars++] = v;
+
+    // try variable pairs
+    for ( Beg = 0; Beg < nVars; Beg++ )
+    {
+        Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, pVars[Beg] ); 
+        for ( End = nVars - 1; End > Beg; End-- )
+        {
+            Kit_TruthExistNew( p->puTemp2, pIsf->puOff, p->nVars, pVars[End] ); 
+            if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp1, p->puTemp2, p->nVars) )
+            {
+                pIsfL->uSupp = (1 << Beg);
+                pIsfR->uSupp = (1 << End);
+                pIsfL->Var = Beg;
+                pIsfR->Var = End;
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks existence of weak OR-bidecomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_DecomposeWeakOr( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR )
+{
+    int v, VarCost, VarBest, Cost, VarCostBest = 0;
+
+    for ( v = 0; v < p->nVars; v++ )
+    {
+        Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, v );
+//        if ( (Q & !bdd_exist( R, VarSetXa )) != bddfalse )
+//        Exist = Cudd_bddExistAbstract( dd, pF->R, Var );   Cudd_Ref( Exist );
+//        if ( Cudd_bddIteConstant( dd, pF->Q, Cudd_Not(Exist), b0 ) != b0 )
+        if ( !Kit_TruthIsImply( pIsf->puOn, p->puTemp1, p->nVars ) )
+        {
+            // measure the cost of this variable
+//            VarCost = bdd_satcountset( bdd_forall( Q, VarSetXa ), VarCube );
+
+//            Univ = Cudd_bddUnivAbstract( dd, pF->Q, Var );   Cudd_Ref( Univ );
+//            VarCost = Kit_TruthCountOnes( Univ, p->nVars );
+//            Cudd_RecursiveDeref( dd, Univ );
+
+            Kit_TruthForallNew( p->puTemp2, pIsf->puOn, p->nVars, v );
+            VarCost = Kit_TruthCountOnes( p->puTemp2, p->nVars );
+            if ( VarCost == 0 )
+                VarCost = 1;
+            if ( VarCostBest < VarCost )
+            {
+                VarCostBest = VarCost;
+                VarBest = v;
+            }
+        }
+    }
+
+    // derive the components for weak-bi-decomposition if the variable is found
+    if ( VarCostBest )
+    {
+//        funQLeftRes = Q & bdd_exist( R, setRightORweak );
+
+//        Temp = Cudd_bddExistAbstract( dd, pF->R, VarBest );     Cudd_Ref( Temp );
+//        pL->Q = Cudd_bddAnd( dd, pF->Q, Temp );                    Cudd_Ref( pL->Q );
+//        Cudd_RecursiveDeref( dd, Temp );
+
+        Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, VarBest );
+        Kit_TruthAnd( pIsfL->puOn, pIsf->puOn, p->puTemp1, p->nVars );
+
+//        pL->R = pF->R;                                            Cudd_Ref( pL->R );
+//        pL->V = VarBest;                                        Cudd_Ref( pL->V );
+        Kit_TruthCopy( pIsfL->puOff, pIsf->puOff, p->nVars );
+        pIsfL->Var = VarBest;
+
+//        assert( pL->Q != b0 );
+//        assert( pL->R != b0 );
+//        assert( Cudd_bddIteConstant( dd, pL->Q, pL->R, b0 ) == b0 );
+
+        // express cost in percents of the covered boolean space
+        Cost = VarCostBest * BDC_SCALE / (1<<p->nVars);
+        if ( Cost == 0 )
+            Cost = 1;
+        return Cost;
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks existence of OR-bidecomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_DecomposeOr( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR )
+{
+    unsigned uSuppRem;
+    int v, nLeftVars = 1, nRightVars = 1; 
+    // clean the var sets
+    Bdc_IsfClean( pIsfL );
+    Bdc_IsfClean( pIsfR );
+    // find initial variable sets
+    if ( !Bdc_DecomposeFindInitialVarSet( p, pIsf, pIsfL, pIsfR ) )
+        return Bdc_DecomposeWeakOr( p, pIsf, pIsfL, pIsfR );
+    // prequantify the variables in the offset
+    Kit_TruthExistNew( p->puTemp1, pIsf->puOff, p->nVars, pIsfL->Var ); 
+    Kit_TruthExistNew( p->puTemp2, pIsf->puOff, p->nVars, pIsfR->Var );
+    // go through the remaining variables
+    uSuppRem = pIsf->uSupp & ~pIsfL->uSupp & ~pIsfR->uSupp;
+    assert( Kit_WordCountOnes(uSuppRem) > 0 );
+    for ( v = 0; v < p->nVars; v++ )
+    {
+        if ( (uSuppRem & (1 << v)) == 0 )
+            continue;
+        // prequantify this variable
+        Kit_TruthExistNew( p->puTemp3, p->puTemp1, p->nVars, v );
+        Kit_TruthExistNew( p->puTemp4, p->puTemp2, p->nVars, v );
+        if ( nLeftVars < nRightVars )
+        {
+//            if ( (Q & bdd_exist( pF->R, pL->V & VarNew ) & bdd_exist( pF->R, pR->V )) == bddfalse )
+//            if ( VerifyORCondition( dd, pF->Q, pF->R, pL->V, pR->V, VarNew ) )
+            if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp3, p->puTemp2, p->nVars) )
+            {
+//                pL->V &= VarNew;
+                pIsfL->uSupp |= (1 << v);
+                nLeftVars++;
+            }
+//            else if ( (Q & bdd_exist( pF->R, pR->V & VarNew ) & bdd_exist( pF->R, pL->V )) == bddfalse )
+            else if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp4, p->puTemp1, p->nVars) )
+            {
+//                pR->V &= VarNew;
+                pIsfR->uSupp |= (1 << v);
+                nRightVars++;
+            }
+        }
+        else
+        {
+//            if ( (Q & bdd_exist( pF->R, pR->V & VarNew ) & bdd_exist( pF->R, pL->V )) == bddfalse )
+            if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp4, p->puTemp1, p->nVars) )
+            {
+//                pR->V &= VarNew;
+                pIsfR->uSupp |= (1 << v);
+                nRightVars++;
+            }
+//            else if ( (Q & bdd_exist( pF->R, pL->V & VarNew ) & bdd_exist( pF->R, pR->V )) == bddfalse )
+            else if ( Kit_TruthIsDisjoint3(pIsf->puOn, p->puTemp3, p->puTemp2, p->nVars) )
+            {
+//                pL->V &= VarNew;
+                pIsfL->uSupp |= (1 << v);
+                nLeftVars++;
+            }
+        }
+    }
+
+    // derive the functions Q and R for the left branch
+//    pL->Q = bdd_appex( pF->Q, bdd_exist( pF->R, pL->V ), bddop_and, pR->V );
+//    pL->R = bdd_exist( pF->R, pR->V );
+
+//    Temp = Cudd_bddExistAbstract( dd, pF->R, pL->V );      Cudd_Ref( Temp );
+//    pL->Q = Cudd_bddAndAbstract( dd, pF->Q, Temp, pR->V ); Cudd_Ref( pL->Q );
+//    Cudd_RecursiveDeref( dd, Temp );
+//    pL->R = Cudd_bddExistAbstract( dd, pF->R, pR->V );     Cudd_Ref( pL->R );
+
+    Kit_TruthAnd( pIsfL->puOn, pIsf->puOn, p->puTemp1, p->nVars );
+    Kit_TruthExistSet( pIsfL->puOn, pIsfL->puOn, p->nVars, pIsfR->uSupp );
+    Kit_TruthCopy( pIsfL->puOff, p->puTemp2, p->nVars );
+
+    // derive the functions Q and R for the right branch
+//    Temp = Cudd_bddExistAbstract( dd, pF->R, pR->V );      Cudd_Ref( Temp );
+//    pR->Q = Cudd_bddAndAbstract( dd, pF->Q, Temp, pL->V ); Cudd_Ref( pR->Q );
+//    Cudd_RecursiveDeref( dd, Temp );
+//    pR->R = Cudd_bddExistAbstract( dd, pF->R, pL->V );     Cudd_Ref( pR->R );
+
+/*
+    Kit_TruthAnd( pIsfR->puOn, pIsf->puOn, p->puTemp2, p->nVars );
+    Kit_TruthExistSet( pIsfR->puOn, pIsfR->puOn, p->nVars, pIsfL->uSupp );
+    Kit_TruthCopy( pIsfR->puOff, p->puTemp1, p->nVars );
+*/
+
+//    assert( pL->Q != b0 );
+//    assert( pL->R != b0 );
+//    assert( Cudd_bddIteConstant( dd, pL->Q, pL->R, b0 ) == b0 );
+    assert( !Kit_TruthIsConst0(pIsfL->puOn, p->nVars) );
+    assert( !Kit_TruthIsConst0(pIsfL->puOff, p->nVars) );
+    assert( Kit_TruthIsDisjoint(pIsfL->puOn, pIsfL->puOff, p->nVars) );
+
+    return Bdc_DecomposeGetCost( p, nLeftVars, nRightVars );        
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs one step of bi-decomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bdc_Type_t Bdc_DecomposeStep( Bdc_Man_t * p, Bdc_Isf_t * pIsf, Bdc_Isf_t * pIsfL, Bdc_Isf_t * pIsfR )
+{
+    int CostOr, CostAnd, CostOrL, CostOrR, CostAndL, CostAndR;
+
+    Bdc_IsfClean( p->pIsfOL );
+    Bdc_IsfClean( p->pIsfOR );
+    Bdc_IsfClean( p->pIsfAL );
+    Bdc_IsfClean( p->pIsfAR );
+
+    // perform OR decomposition
+    CostOr = Bdc_DecomposeOr( p, pIsf, p->pIsfOL, p->pIsfOR );
+
+    // perform AND decomposition
+    Bdc_IsfNot( pIsf );
+    CostAnd = Bdc_DecomposeOr( p, pIsf, p->pIsfAL, p->pIsfAR );
+    Bdc_IsfNot( pIsf );
+    Bdc_IsfNot( p->pIsfAL );
+    Bdc_IsfNot( p->pIsfAR );
+
+    // check the hash table
+    Bdc_SuppMinimize( p, p->pIsfOL );
+    CostOrL = (Bdc_TableLookup(p, p->pIsfOL) != NULL);
+    Bdc_SuppMinimize( p, p->pIsfOR );
+    CostOrR = (Bdc_TableLookup(p, p->pIsfOR) != NULL);
+    Bdc_SuppMinimize( p, p->pIsfAL );
+    CostAndL = (Bdc_TableLookup(p, p->pIsfAL) != NULL);
+    Bdc_SuppMinimize( p, p->pIsfAR );
+    CostAndR = (Bdc_TableLookup(p, p->pIsfAR) != NULL);
+
+    // check if there is any reuse for the components
+    if ( CostOrL + CostOrR < CostAndL + CostAndR )
+    {
+        Bdc_IsfCopy( pIsfL, p->pIsfOL );
+        Bdc_IsfCopy( pIsfR, p->pIsfOR );
+        return BDC_TYPE_OR;
+    }
+    if ( CostOrL + CostOrR > CostAndL + CostAndR )
+    {
+        Bdc_IsfCopy( pIsfL, p->pIsfAL );
+        Bdc_IsfCopy( pIsfR, p->pIsfAR );
+        return BDC_TYPE_AND; 
+    }
+
+    // compare the two-component costs
+    if ( CostOr < CostAnd )
+    {
+        Bdc_IsfCopy( pIsfL, p->pIsfOL );
+        Bdc_IsfCopy( pIsfR, p->pIsfOR );
+        return BDC_TYPE_OR;
+    }
+    return BDC_TYPE_AND;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/bdc/bdcInt.h b/abc70930/src/aig/bdc/bdcInt.h
new file mode 100644
index 00000000..9649f870
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdcInt.h
@@ -0,0 +1,150 @@
+/**CFile****************************************************************
+
+  FileName    [bdcInt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    [Internal declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 15, 2007.]
+
+  Revision    [$Id: resInt.h,v 1.00 2007/01/15 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __BDC_INT_H__
+#define __BDC_INT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include "kit.h"
+#include "bdc.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+#define BDC_SCALE 100  // value used to compute the cost
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+// network types
+typedef enum { 
+    BDC_TYPE_NONE = 0,  // 0:  unknown
+    BDC_TYPE_CONST1,    // 1:  constant 1
+    BDC_TYPE_PI,        // 2:  primary input
+    BDC_TYPE_AND,       // 4:  AND-gate
+    BDC_TYPE_OR,        // 5:  OR-gate (temporary)
+    BDC_TYPE_XOR,       // 6:  XOR-gate
+    BDC_TYPE_MUX,       // 7:  MUX-gate
+    BDC_TYPE_OTHER      // 8:  unused
+} Bdc_Type_t;
+
+typedef struct Bdc_Fun_t_ Bdc_Fun_t;
+struct Bdc_Fun_t_
+{
+    int              Type;         // Const1, PI, AND, XOR, MUX
+    Bdc_Fun_t *      pFan0;        // fanin of the given node
+    Bdc_Fun_t *      pFan1;        // fanin of the given node
+    Bdc_Fun_t *      pFan2;        // fanin of the given node
+    unsigned         uSupp;        // bit mask of current support
+    unsigned *       puFunc;       // the function of the node
+    Bdc_Fun_t *      pNext;        // next function with same support
+    void *           pCopy;        // the copy field
+};
+
+typedef struct Bdc_Isf_t_ Bdc_Isf_t;
+struct Bdc_Isf_t_
+{
+    int              Var;          // the first variable assigned
+    unsigned         uSupp;        // the current support
+    unsigned *       puOn;         // on-set
+    unsigned *       puOff;        // off-set
+};
+
+struct Bdc_Man_t_
+{
+    // external parameters
+    Bdc_Par_t *      pPars;        // parameter set
+    int              nVars;        // the number of variables
+    int              nWords;       // the number of words 
+    int              nNodesLimit;  // the limit on the number of new nodes
+    int              nDivsLimit;   // the limit on the number of divisors
+    // internal nodes
+    Bdc_Fun_t *      pNodes;       // storage for decomposition nodes
+    int              nNodes;       // the number of nodes used
+    int              nNodesNew;    // the number of nodes used
+    int              nNodesAlloc;  // the number of nodes allocated  
+    Bdc_Fun_t *      pRoot;        // the root node
+    // resub candidates
+    Bdc_Fun_t **     pTable;       // hash table of candidates
+    int              nTableSize;   // hash table size (1 << nVarsMax)
+    Vec_Int_t *      vSpots;       // the occupied spots in the table
+    // elementary truth tables 
+    Vec_Ptr_t *      vTruths;      // for const 1 and elementary variables
+    unsigned *       puTemp1;      // temporary truth table
+    unsigned *       puTemp2;      // temporary truth table
+    unsigned *       puTemp3;      // temporary truth table
+    unsigned *       puTemp4;      // temporary truth table
+    // temporary ISFs
+    Bdc_Isf_t * pIsfOL, IsfOL;
+    Bdc_Isf_t * pIsfOR, IsfOR;
+    Bdc_Isf_t * pIsfAL, IsfAL;
+    Bdc_Isf_t * pIsfAR, IsfAR;
+    // internal memory manager
+    Vec_Int_t *      vMemory;      // memory for internal truth tables
+};
+
+// working with complemented attributes of objects
+static inline int         Bdc_IsComplement( Bdc_Fun_t * p )             { return (int)((unsigned long)p & (unsigned long)01);              }
+static inline Bdc_Fun_t * Bdc_Regular( Bdc_Fun_t * p )                  { return (Bdc_Fun_t *)((unsigned long)p & ~(unsigned long)01);     }
+static inline Bdc_Fun_t * Bdc_Not( Bdc_Fun_t * p )                      { return (Bdc_Fun_t *)((unsigned long)p ^  (unsigned long)01);     }
+static inline Bdc_Fun_t * Bdc_NotCond( Bdc_Fun_t * p, int c )           { return (Bdc_Fun_t *)((unsigned long)p ^  (unsigned long)(c!=0)); }
+
+static inline Bdc_Fun_t * Bdc_FunNew( Bdc_Man_t * p )                   { Bdc_Fun_t * pRes; if ( p->nNodes == p->nNodesLimit ) return NULL; pRes = p->pNodes + p->nNodes++; memset( pRes, 0, sizeof(Bdc_Fun_t) ); p->nNodesNew++; return pRes; }
+static inline void        Bdc_IsfStart( Bdc_Man_t * p, Bdc_Isf_t * pF ) { pF->puOn = Vec_IntFetch( p->vMemory, p->nWords ); pF->puOff = Vec_IntFetch( p->vMemory, p->nWords ); }
+static inline void        Bdc_IsfClean( Bdc_Isf_t * p )                 { p->uSupp = 0; p->Var = 0;                                        }
+static inline void        Bdc_IsfCopy( Bdc_Isf_t * p, Bdc_Isf_t * q )   { Bdc_Isf_t T = *p; *p = *q; *q = T;                               }
+static inline void        Bdc_IsfNot( Bdc_Isf_t * p )                   { unsigned * puT = p->puOn; p->puOn = p->puOff; p->puOff = puT;    }
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== bdcDec.c ==========================================================*/
+extern Bdc_Fun_t *      Bdc_ManDecompose_rec( Bdc_Man_t * p, Bdc_Isf_t * pIsf );
+/*=== bdcTable.c ==========================================================*/
+extern Bdc_Fun_t *      Bdc_TableLookup( Bdc_Man_t * p, Bdc_Isf_t * pIsf );
+extern void             Bdc_TableAdd( Bdc_Man_t * p, Bdc_Fun_t * pFunc );
+extern void             Bdc_TableClear( Bdc_Man_t * p );
+extern void             Bdc_SuppMinimize( Bdc_Man_t * p, Bdc_Isf_t * pIsf );
+extern int              Bdc_TableCheckContainment( Bdc_Man_t * p, Bdc_Isf_t * pIsf, unsigned * puTruth );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/bdc/bdcTable.c b/abc70930/src/aig/bdc/bdcTable.c
new file mode 100644
index 00000000..d86a938d
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdcTable.c
@@ -0,0 +1,140 @@
+/**CFile****************************************************************
+
+  FileName    [bdcTable.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    [Hash table for intermediate nodes.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 30, 2007.]
+
+  Revision    [$Id: bdcTable.c,v 1.00 2007/01/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bdcInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Minimizes the support of the ISF.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bdc_SuppMinimize( Bdc_Man_t * p, Bdc_Isf_t * pIsf )
+{
+    int v;
+    // go through the support variables
+    for ( v = 0; v < p->nVars; v++ )
+    {
+        if ( (pIsf->uSupp & (1 << v)) == 0 )
+            continue;
+        Kit_TruthExistNew( p->puTemp1, pIsf->puOn, p->nVars, v );
+        Kit_TruthExistNew( p->puTemp2, pIsf->puOff, p->nVars, v );
+        if ( !Kit_TruthIsDisjoint( p->puTemp1, p->puTemp2, p->nVars ) )
+            continue;
+        // remove the variable
+        Kit_TruthCopy( pIsf->puOn, p->puTemp1, p->nVars );
+        Kit_TruthCopy( pIsf->puOff, p->puTemp2, p->nVars );
+        pIsf->uSupp &= ~(1 << v);
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks containment of the function in the ISF.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Bdc_TableCheckContainment( Bdc_Man_t * p, Bdc_Isf_t * pIsf, unsigned * puTruth )
+{
+    return Kit_TruthIsImply( pIsf->puOn, puTruth, p->nVars ) &&
+         Kit_TruthIsDisjoint( pIsf->puOff, puTruth, p->nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the new entry to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Bdc_Fun_t * Bdc_TableLookup( Bdc_Man_t * p, Bdc_Isf_t * pIsf )
+{
+    Bdc_Fun_t * pFunc;
+    for ( pFunc = p->pTable[pIsf->uSupp]; pFunc; pFunc = pFunc->pNext )
+        if ( Bdc_TableCheckContainment( p, pIsf, pFunc->puFunc ) )
+             return pFunc;
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the new entry to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bdc_TableAdd( Bdc_Man_t * p, Bdc_Fun_t * pFunc )
+{
+    if ( p->pTable[pFunc->uSupp] == NULL )
+        Vec_IntPush( p->vSpots, pFunc->uSupp );
+    pFunc->pNext = p->pTable[pFunc->uSupp];
+    p->pTable[pFunc->uSupp] = pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the new entry to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Bdc_TableClear( Bdc_Man_t * p )
+{
+    int Spot, i;
+    Vec_IntForEachEntry( p->vSpots, Spot, i )
+        p->pTable[Spot] = NULL;
+    Vec_IntClear( p->vSpots );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/bdc/bdc_.c b/abc70930/src/aig/bdc/bdc_.c
new file mode 100644
index 00000000..9d0a9462
--- /dev/null
+++ b/abc70930/src/aig/bdc/bdc_.c
@@ -0,0 +1,49 @@
+/**CFile****************************************************************
+
+  FileName    [bdc_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Truth-table-based bi-decomposition engine.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - January 30, 2007.]
+
+  Revision    [$Id: bdc_.c,v 1.00 2007/01/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "bdcInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/bdc/module.make b/abc70930/src/aig/bdc/module.make
new file mode 100644
index 00000000..8697c998
--- /dev/null
+++ b/abc70930/src/aig/bdc/module.make
@@ -0,0 +1,4 @@
+SRC +=  src/aig/bdc/bdcCore.c \
+    src/aig/bdc/bdcDec.c \
+    src/aig/bdc/bdcTable.c
+
diff --git a/abc70930/src/aig/cnf/cnf.h b/abc70930/src/aig/cnf/cnf.h
new file mode 100644
index 00000000..5c7a594e
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnf.h
@@ -0,0 +1,162 @@
+/**CFile****************************************************************
+
+  FileName    [cnf.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnf.h,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __CNF_H__
+#define __CNF_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "vec.h"
+#include "aig.h"
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Cnf_Man_t_            Cnf_Man_t;
+typedef struct Cnf_Dat_t_            Cnf_Dat_t;
+typedef struct Cnf_Cut_t_            Cnf_Cut_t;
+
+// the CNF asserting outputs of AIG to be 1
+struct Cnf_Dat_t_
+{
+    Aig_Man_t *     pMan;            // the AIG manager, for which CNF is computed
+    int             nVars;           // the number of variables
+    int             nLiterals;       // the number of CNF literals
+    int             nClauses;        // the number of CNF clauses
+    int **          pClauses;        // the CNF clauses
+    int *           pVarNums;        // the number of CNF variable for each node ID (-1 if unused)
+};
+
+// the cut used to represent node in the AIG
+struct Cnf_Cut_t_
+{
+    char            nFanins;         // the number of leaves
+    char            Cost;            // the cost of this cut
+    short           nWords;          // the number of words in truth table
+    Vec_Int_t *     vIsop[2];        // neg/pos ISOPs
+    int             pFanins[0];      // the fanins (followed by the truth table)
+};
+
+// the CNF computation manager
+struct Cnf_Man_t_
+{
+    Aig_Man_t *     pManAig;         // the underlying AIG manager
+    char *          pSopSizes;       // sizes of SOPs for 4-variable functions
+    char **         pSops;           // the SOPs for 4-variable functions
+    int             aArea;           // the area of the mapping
+    Aig_MmFlex_t *  pMemCuts;        // memory manager for cuts
+    int             nMergeLimit;     // the limit on the size of merged cut
+    unsigned *      pTruths[4];      // temporary truth tables
+    Vec_Int_t *     vMemory;         // memory for intermediate ISOP representation
+    int             timeCuts; 
+    int             timeMap;
+    int             timeSave;
+};
+
+
+static inline Dar_Cut_t *  Dar_ObjBestCut( Aig_Obj_t * pObj ) { Dar_Cut_t * pCut; int i; Dar_ObjForEachCut( pObj, pCut, i ) if ( pCut->fBest ) return pCut; return NULL; }
+
+static inline int          Cnf_CutSopCost( Cnf_Man_t * p, Dar_Cut_t * pCut ) { return p->pSopSizes[pCut->uTruth] + p->pSopSizes[0xFFFF & ~pCut->uTruth]; }
+
+static inline int          Cnf_CutLeaveNum( Cnf_Cut_t * pCut )    { return pCut->nFanins;                               }
+static inline int *        Cnf_CutLeaves( Cnf_Cut_t * pCut )      { return pCut->pFanins;                               }
+static inline unsigned *   Cnf_CutTruth( Cnf_Cut_t * pCut )       { return (unsigned *)(pCut->pFanins + pCut->nFanins); }
+
+static inline Cnf_Cut_t *  Cnf_ObjBestCut( Aig_Obj_t * pObj )                       { return pObj->pData;  }
+static inline void         Cnf_ObjSetBestCut( Aig_Obj_t * pObj, Cnf_Cut_t * pCut )  { pObj->pData = pCut;  }
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                           ITERATORS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over leaves of the cut
+#define Cnf_CutForEachLeaf( p, pCut, pLeaf, i )                         \
+    for ( i = 0; (i < (int)(pCut)->nFanins) && ((pLeaf) = Aig_ManObj(p, (pCut)->pFanins[i])); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== cnfCore.c ========================================================*/
+extern Cnf_Dat_t *     Cnf_Derive( Aig_Man_t * pAig, int nOutputs );
+extern Cnf_Man_t *     Cnf_ManRead();
+extern void            Cnf_ClearMemory();
+/*=== cnfCut.c ========================================================*/
+extern Cnf_Cut_t *     Cnf_CutCreate( Cnf_Man_t * p, Aig_Obj_t * pObj );
+extern void            Cnf_CutPrint( Cnf_Cut_t * pCut );
+extern void            Cnf_CutFree( Cnf_Cut_t * pCut );
+extern void            Cnf_CutUpdateRefs( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, Cnf_Cut_t * pCutRes );
+extern Cnf_Cut_t *     Cnf_CutCompose( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, int iFan );
+/*=== cnfData.c ========================================================*/
+extern void            Cnf_ReadMsops( char ** ppSopSizes, char *** ppSops );
+/*=== cnfMan.c ========================================================*/
+extern Cnf_Man_t *     Cnf_ManStart();
+extern void            Cnf_ManStop( Cnf_Man_t * p );
+extern Vec_Int_t *     Cnf_DataCollectPiSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p );
+extern void            Cnf_DataFree( Cnf_Dat_t * p );
+extern void            Cnf_DataWriteIntoFile( Cnf_Dat_t * p, char * pFileName, int fReadable );
+void *                 Cnf_DataWriteIntoSolver( Cnf_Dat_t * p );
+/*=== cnfMap.c ========================================================*/
+extern void            Cnf_DeriveMapping( Cnf_Man_t * p );
+extern int             Cnf_ManMapForCnf( Cnf_Man_t * p );
+/*=== cnfPost.c ========================================================*/
+extern void            Cnf_ManTransferCuts( Cnf_Man_t * p );
+extern void            Cnf_ManFreeCuts( Cnf_Man_t * p );
+extern void            Cnf_ManPostprocess( Cnf_Man_t * p );
+/*=== cnfUtil.c ========================================================*/
+extern Vec_Ptr_t *     Aig_ManScanMapping( Cnf_Man_t * p, int fCollect );
+extern Vec_Ptr_t *     Cnf_ManScanMapping( Cnf_Man_t * p, int fCollect, int fPreorder );
+/*=== cnfWrite.c ========================================================*/
+extern void            Cnf_SopConvertToVector( char * pSop, int nCubes, Vec_Int_t * vCover );
+extern Cnf_Dat_t *     Cnf_ManWriteCnf( Cnf_Man_t * p, Vec_Ptr_t * vMapped, int nOutputs );
+extern Cnf_Dat_t *     Cnf_DeriveSimple( Aig_Man_t * p, int nOutputs );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/cnf/cnfCore.c b/abc70930/src/aig/cnf/cnfCore.c
new file mode 100644
index 00000000..06731451
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfCore.c
@@ -0,0 +1,185 @@
+/**CFile****************************************************************
+
+  FileName    [cnfCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfCore.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Cnf_Man_t * s_pManCnf = NULL;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Converts AIG into the SAT solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Dat_t * Cnf_Derive( Aig_Man_t * pAig, int nOutputs )
+{
+    Cnf_Man_t * p;
+    Cnf_Dat_t * pCnf;
+    Vec_Ptr_t * vMapped;
+    Aig_MmFixed_t * pMemCuts;
+    int clk;
+    // allocate the CNF manager
+    if ( s_pManCnf == NULL )
+        s_pManCnf = Cnf_ManStart();
+    // connect the managers
+    p = s_pManCnf;
+    p->pManAig = pAig;
+
+    // generate cuts for all nodes, assign cost, and find best cuts
+clk = clock();
+    pMemCuts = Dar_ManComputeCuts( pAig, 10 );
+p->timeCuts = clock() - clk;
+
+    // find the mapping
+clk = clock();
+    Cnf_DeriveMapping( p );
+p->timeMap = clock() - clk;
+//    Aig_ManScanMapping( p, 1 );
+
+    // convert it into CNF
+clk = clock();
+    Cnf_ManTransferCuts( p );
+    vMapped = Cnf_ManScanMapping( p, 1, 1 );
+    pCnf = Cnf_ManWriteCnf( p, vMapped, nOutputs );
+    Vec_PtrFree( vMapped );
+    Aig_MmFixedStop( pMemCuts, 0 );
+p->timeSave = clock() - clk;
+
+   // reset reference counters
+    Aig_ManResetRefs( pAig );
+//PRT( "Cuts   ", p->timeCuts );
+//PRT( "Map    ", p->timeMap  );
+//PRT( "Saving ", p->timeSave );
+    return pCnf;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Man_t * Cnf_ManRead()
+{
+    return s_pManCnf;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ClearMemory()
+{
+    if ( s_pManCnf == NULL )
+        return;
+    Cnf_ManStop( s_pManCnf );
+    s_pManCnf = NULL;
+}
+
+
+#if 0
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Dat_t * Cnf_Derive_old( Aig_Man_t * pAig )
+{
+/*
+    // iteratively improve area flow
+    for ( i = 0; i < nIters; i++ )
+    {
+clk = clock();
+        Cnf_ManScanMapping( p, 0 );
+        Cnf_ManMapForCnf( p );
+PRT( "iter ", clock() - clk );
+    }
+*/
+    // write the file
+    vMapped = Aig_ManScanMapping( p, 1 );
+    Vec_PtrFree( vMapped );
+
+clk = clock();
+    Cnf_ManTransferCuts( p );
+
+    Cnf_ManPostprocess( p );
+    Cnf_ManScanMapping( p, 0 );
+/*
+    Cnf_ManPostprocess( p );
+    Cnf_ManScanMapping( p, 0 );
+    Cnf_ManPostprocess( p );
+    Cnf_ManScanMapping( p, 0 );
+*/
+PRT( "Ext ", clock() - clk );
+
+/*
+    vMapped = Cnf_ManScanMapping( p, 1 );
+    pCnf = Cnf_ManWriteCnf( p, vMapped );
+    Vec_PtrFree( vMapped );
+
+    // clean up
+    Cnf_ManFreeCuts( p );
+    Dar_ManCutsFree( pAig );
+    return pCnf;
+*/
+    Aig_MmFixedStop( pMemCuts, 0 );
+    return NULL;
+}
+
+#endif
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfCut.c b/abc70930/src/aig/cnf/cnfCut.c
new file mode 100644
index 00000000..17ab0c78
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfCut.c
@@ -0,0 +1,371 @@
+/**CFile****************************************************************
+
+  FileName    [cnfCut.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfCut.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutAlloc( Cnf_Man_t * p, int nLeaves )
+{
+    Cnf_Cut_t * pCut;
+    int nSize = sizeof(Cnf_Cut_t) + sizeof(int) * nLeaves + sizeof(unsigned) * Aig_TruthWordNum(nLeaves);
+    pCut = (Cnf_Cut_t *)Aig_MmFlexEntryFetch( p->pMemCuts, nSize );
+    pCut->nFanins = nLeaves;
+    pCut->nWords = Aig_TruthWordNum(nLeaves);
+    pCut->vIsop[0] = pCut->vIsop[1] = NULL;
+    return pCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutFree( Cnf_Cut_t * pCut )
+{
+    if ( pCut->vIsop[0] )
+        Vec_IntFree( pCut->vIsop[0] );
+    if ( pCut->vIsop[1] )
+        Vec_IntFree( pCut->vIsop[1] );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates cut for the given node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutCreate( Cnf_Man_t * p, Aig_Obj_t * pObj )
+{
+    Dar_Cut_t * pCutBest;
+    Cnf_Cut_t * pCut;
+    unsigned * pTruth;
+    assert( Aig_ObjIsNode(pObj) );
+    pCutBest = Dar_ObjBestCut( pObj );
+    assert( pCutBest != NULL );
+    assert( pCutBest->nLeaves <= 4 );
+    pCut = Cnf_CutAlloc( p, pCutBest->nLeaves );
+    memcpy( pCut->pFanins, pCutBest->pLeaves, sizeof(int) * pCutBest->nLeaves );
+    pTruth = Cnf_CutTruth(pCut);
+    *pTruth = (pCutBest->uTruth << 16) | pCutBest->uTruth;
+    pCut->Cost = Cnf_CutSopCost( p, pCutBest );
+    return pCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutPrint( Cnf_Cut_t * pCut )
+{
+    int i;
+    printf( "{" );
+    for ( i = 0; i < pCut->nFanins; i++ )
+        printf( "%d ", pCut->pFanins[i] );
+    printf( " } " );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutDeref( Cnf_Man_t * p, Cnf_Cut_t * pCut )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Cnf_CutForEachLeaf( p->pManAig, pCut, pObj, i )
+    {
+        assert( pObj->nRefs > 0 );
+        pObj->nRefs--;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutRef( Cnf_Man_t * p, Cnf_Cut_t * pCut )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Cnf_CutForEachLeaf( p->pManAig, pCut, pObj, i )
+    {
+        pObj->nRefs++;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutUpdateRefs( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, Cnf_Cut_t * pCutRes )
+{
+    Cnf_CutDeref( p, pCut );
+    Cnf_CutDeref( p, pCutFan );
+    Cnf_CutRef( p, pCutRes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two arrays of integers.]
+
+  Description [Returns the number of items.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Cnf_CutMergeLeaves( Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, int * pFanins )
+{
+    int i, k, nFanins = 0;
+    for ( i = k = 0; i < pCut->nFanins && k < pCutFan->nFanins; )
+    {
+        if ( pCut->pFanins[i] == pCutFan->pFanins[k] )
+            pFanins[nFanins++] = pCut->pFanins[i], i++, k++;
+        else if ( pCut->pFanins[i] < pCutFan->pFanins[k] )
+            pFanins[nFanins++] = pCut->pFanins[i], i++;
+        else
+            pFanins[nFanins++] = pCutFan->pFanins[k], k++;
+    }
+    for ( ; i < pCut->nFanins; i++ )
+        pFanins[nFanins++] = pCut->pFanins[i];
+    for ( ; k < pCutFan->nFanins; k++ )
+        pFanins[nFanins++] = pCutFan->pFanins[k];
+    return nFanins;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the stretching phase of the cut w.r.t. the merged cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Cnf_TruthPhase( Cnf_Cut_t * pCut, Cnf_Cut_t * pCut1 )
+{
+    unsigned uPhase = 0;
+    int i, k;
+    for ( i = k = 0; i < pCut->nFanins; i++ )
+    {
+        if ( k == pCut1->nFanins )
+            break;
+        if ( pCut->pFanins[i] < pCut1->pFanins[k] )
+            continue;
+        assert( pCut->pFanins[i] == pCut1->pFanins[k] );
+        uPhase |= (1 << i);
+        k++;
+    }
+    return uPhase;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes the fanin variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutRemoveIthVar( Cnf_Cut_t * pCut, int iVar, int iFan )
+{
+    int i;
+    assert( pCut->pFanins[iVar] == iFan );
+    pCut->nFanins--;
+    for ( i = iVar; i < pCut->nFanins; i++ )
+        pCut->pFanins[i] = pCut->pFanins[i+1];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts the fanin variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutInsertIthVar( Cnf_Cut_t * pCut, int iVar, int iFan )
+{
+    int i;
+    for ( i = pCut->nFanins; i > iVar; i-- )
+        pCut->pFanins[i] = pCut->pFanins[i-1];
+    pCut->pFanins[iVar] = iFan;
+    pCut->nFanins++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two cuts.]
+
+  Description [Returns NULL of the cuts cannot be merged.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Cut_t * Cnf_CutCompose( Cnf_Man_t * p, Cnf_Cut_t * pCut, Cnf_Cut_t * pCutFan, int iFan )
+{
+    Cnf_Cut_t * pCutRes;
+    static int pFanins[32];
+    unsigned * pTruth, * pTruthFan, * pTruthRes;
+    unsigned * pTop = p->pTruths[0], * pFan = p->pTruths[2], * pTemp = p->pTruths[3];
+    unsigned uPhase, uPhaseFan;
+    int i, iVar, nFanins, RetValue;
+
+    // make sure the second cut is the fanin of the first
+    for ( iVar = 0; iVar < pCut->nFanins; iVar++ )
+        if ( pCut->pFanins[iVar] == iFan )
+            break;
+    assert( iVar < pCut->nFanins );
+    // remove this variable
+    Cnf_CutRemoveIthVar( pCut, iVar, iFan );
+    // merge leaves of the cuts
+    nFanins = Cnf_CutMergeLeaves( pCut, pCutFan, pFanins );
+    if ( nFanins+1 > p->nMergeLimit )
+    {
+        Cnf_CutInsertIthVar( pCut, iVar, iFan );
+        return NULL;
+    }
+    // create new cut
+    pCutRes = Cnf_CutAlloc( p, nFanins );
+    memcpy( pCutRes->pFanins, pFanins, sizeof(int) * nFanins );
+    assert( pCutRes->nFanins <= pCut->nFanins + pCutFan->nFanins );
+
+    // derive its truth table
+    // get the truth tables in the composition space
+    pTruth    = Cnf_CutTruth(pCut);
+    pTruthFan = Cnf_CutTruth(pCutFan);
+    pTruthRes = Cnf_CutTruth(pCutRes);
+    for ( i = 0; i < 2*pCutRes->nWords; i++ )
+        pTop[i] = pTruth[i % pCut->nWords];
+    for ( i = 0; i < pCutRes->nWords; i++ )
+        pFan[i] = pTruthFan[i % pCutFan->nWords];
+    // move the variable to the end
+    uPhase = Kit_BitMask( pCutRes->nFanins+1 ) & ~(1 << iVar);
+    Kit_TruthShrink( pTemp, pTop, pCutRes->nFanins, pCutRes->nFanins+1, uPhase, 1 );
+    // compute the phases
+    uPhase    = Cnf_TruthPhase( pCutRes, pCut    ) | (1 << pCutRes->nFanins);
+    uPhaseFan = Cnf_TruthPhase( pCutRes, pCutFan );
+    // permute truth-tables to the common support
+    Kit_TruthStretch( pTemp, pTop, pCut->nFanins+1,  pCutRes->nFanins+1, uPhase,    1 );
+    Kit_TruthStretch( pTemp, pFan, pCutFan->nFanins, pCutRes->nFanins,   uPhaseFan, 1 );
+    // perform Boolean operation
+    Kit_TruthMux( pTruthRes, pTop, pTop+pCutRes->nWords, pFan, pCutRes->nFanins );
+    // return the cut to its original condition
+    Cnf_CutInsertIthVar( pCut, iVar, iFan );
+    // consider the simple case
+    if ( pCutRes->nFanins < 5 )
+    {
+        pCutRes->Cost = p->pSopSizes[0xFFFF & *pTruthRes] + p->pSopSizes[0xFFFF & ~*pTruthRes];
+        return pCutRes;
+    }
+
+    // derive ISOP for positive phase
+    RetValue = Kit_TruthIsop( pTruthRes, pCutRes->nFanins, p->vMemory, 0 );
+    pCutRes->vIsop[1] = (RetValue == -1)? NULL : Vec_IntDup( p->vMemory );
+    // derive ISOP for negative phase
+    Kit_TruthNot( pTruthRes, pTruthRes, pCutRes->nFanins );
+    RetValue = Kit_TruthIsop( pTruthRes, pCutRes->nFanins, p->vMemory, 0 );
+    pCutRes->vIsop[0] = (RetValue == -1)? NULL : Vec_IntDup( p->vMemory );
+    Kit_TruthNot( pTruthRes, pTruthRes, pCutRes->nFanins );
+
+    // compute the cut cost
+    if ( pCutRes->vIsop[0] == NULL || pCutRes->vIsop[1] == NULL )
+        pCutRes->Cost = 127;
+    else if ( Vec_IntSize(pCutRes->vIsop[0]) + Vec_IntSize(pCutRes->vIsop[1]) > 127 )
+        pCutRes->Cost = 127;
+    else
+        pCutRes->Cost = Vec_IntSize(pCutRes->vIsop[0]) + Vec_IntSize(pCutRes->vIsop[1]);
+    return pCutRes;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfData.c b/abc70930/src/aig/cnf/cnfData.c
new file mode 100644
index 00000000..7b8be51e
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfData.c
@@ -0,0 +1,4784 @@
+/**CFile****************************************************************
+
+  FileName    [cnfData.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfData.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static char s_Data3[81] = "!#&()*+,-.0123456789:;<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ[]abcdefghijklmnopqrstuvwxyz|";
+
+static char * s_Data4[] = {
+"! B a . 8 .B 8a K !K T Ta j 8j Tj s ( + (B +a (. +8 .B( +8a (K +K T( +T j( ",
+"+j Tj( s+ E !E H Ha E. 8E H. H8 EK EK! HT HTa jE 8jE Hj sH d +d Hd g d. 8d ",
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+"j 5T s5 ; +; ;B a; 5; > 5;B >a ;K +;K T; +T; ;j >j 5T; s> E2 !E2 H2 Ha2 5E ",
+"58E H5 H58 EK2 !E2K HT2 TaH2 5jE 8j5E H5T sH5 d; +d; H; g; 5d >d H5d g> dK;",
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+"2 5j# 5&j 5T# s5& ;# ;& ;#B a;& 5;# >& ;#5B >&a ;#K ;&K T;# T;& ;j# >&j 5#T",
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+". 8dW& HWd#. W8g& Qd# Qd& Zd# gZ& W#dj W&+j djZ# Z&gs m# m& m#B am& 5m# 5&m",
+" m#5B am5& Qm# Q&m Tm# Tm& p# p& pT# sp& m;# +m& ;#mB m&a; m;5# >m& 5m;#B a",
+"m>& Q;# Q;& Q#T; T;Q& p;# p>& T;p# p&s> Wm# W&m Hm# Hm& 5W# 5W& H#5W 5WH& Q",
+"mW# WQm& Zm# Z&m pW# p&W Zp# Zp& v# v& vH# gv& v5# v>& H5v# v&g> vQ# v&Q Zv",
+"# Zv& pv# pv& Z#pv y& C !C D Da C. 8C D. D8 CK CK! DT DTa jC 8jC Dj sD C( +",
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+"T2Da 5jC 8j5C 5DT s5D ;C +;C D; +D; 5;C >C 5D; >D ;CK ;C+K D;T D;+T ;jC >jC",
+" D;j s>D CE2 CE!2 HD2 H2Da 5CE 8C5E H5D 5DH8 CE2K !E2CK H2DT HDTa2 jC5E 58j",
+"CE 5DHj H5sD d;C d;+C H;D gD; 5dC >Cd 5Dd g>D ;CdK +d;CK TdD; D;gT 5Cdj dj>",
+"C Dd5T >Dgs CN !CN DN DaN N.C 8CN DN. D8N QC Q!C QD QDa QjC Q8C QDj sQD C(N",
+" +CN D(N +DN C(N. 8C+N N.D( +ND8 QC( +QC QD( +QD jCQ( +CQ8 Q(Dj +QsD WC W!C",
+" WD WDa WC. W8C WD. WD8 WQC WCQ! ZD ZDa WjC WCQ8 ZDj sZD WdC +WC WDd gWD dC",
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+"j b8Rj RbVj scR Rb( Rb+ bDR( cR+ b(R. b+R8 RbD(. R+c8 R(bM bMR+ RbV( V+cR R",
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+"bW bWR& bHRW cRW R.bW bWR8 RbHW. RWc8 SbW bWS& SZb ScZ bWSj bWS8 SjZb ZcSs ",
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+"; S>b SpbV; Sc> bWRm RbWm& bHRm RHcm b5RW Rb5W8 RbH5W R5cW bWSm SbWm& SmZb ",
+"cmSZ SWpb SpbW8 ZpSb SZcp vRb Rbv& RbvD cvR Rbv5 >Rvb vRbH5 v>cR Svb vbS+ S",
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+" lR lR8 lRT lsR Rk( R+k k(RB +kRa R1( R1+ 1(RB 1+Ra kMR( Rk+M R(Tk +kRT lR(",
+" l+R RTl( sRl+ RkE kER! RHk HkRa R1E RE8k R1H 1HR8 kMRE RkM!E HkRT RHTak lR",
+"E R8lE lHR sRlH Rdk +kRd HkRd gRk R1d 1+Rd 1HRd gR1 RkdM dkMR+ TkRd RTgk ld",
+"R R+ld RHld glR Rk2 k2R! k2RB R2ak R15 5kR8 RB5k 1aR5 kMR2 RkM!2 R2Tk ak2RT",
+" lR5 R5l8 R5lT l5sR R;k +kR; RBk; akR; R1; >kR RB1; R1>a RkM; k;MR+ TkR; ak",
+";RT l;R l>R RTl; sRl> kER2 RkE!2 R2Hk ak2RH RE5k R158E 1HR5 R1H5a RkME2 kME",
+"R2! RHTk2 RHTak2 R5lE lR58E RHl5 lsRH5 dkR; dk;R+ HkR; R;gk 1dR5 R1>d 1HR; ",
+"gR>k dkMR; R+dk;M RH;Tk gRTk; R5ld >Rld RHl; gRl> kP kP! kPB akP R1P 8kP RB",
+"1P 1PRa Sk S!k STk Sak Sl Sl8 SlT Ssl kP( +kP P(kB ak+P R(1P 1PR+ kP(1B akP",
+"1+ Sk( S+k TkS( +TSk Sl( l+S STl( l+Ss RWk R!Wk HkP WkRa R1W 1WR8 1HRW 1WRa",
+" SWk WkS! SZk ZkSa lWS S8lW lZS lZSs dkP +kRW dkHP gkP 1WRd 1+RW dkP1H R1gP",
+" Sdk +WSk ZkSd gSk ldS S+lW SZld glS Rmk R!km RBkm akRm R1m 1mR8 RB1m 1aRm ",
+"Skm kmS! TkSm akSm Slp lpS8 lTSp Slsp k;P +kRm kB;P k;aP 1mR; >kP k;P1B ak>",
+"P S;k +kS; TkS; akS; l;S S>l lTS; Ssl> WkRm km!RW HkRm akmRH 1WR5 R1W8m 1HR",
+"m akPH5 WkSm S!Wkm SmZk SZakm SplW SlpW8 SplZ SZpls vRk R+vk RHvk vRgk vR1 ",
+"vR>k R1vH gk>P Svk vkS+ ZkSv gkSv lvS S>lv lZSv ylS R9 R9& R9B R9a R91 :R 9",
+"1RB :Ra R9M 9MR& R9T 9TRa lR9 l:R R9lT s:R R9( R9+ 9(RB 9+Ra 91R( :R+ R91(B",
+" R+:a R(9M 9MR+ R(9T 9+RT R9l( :Rl+ lR9T( s+:R R9E REk& R9H 9HRa 91RE :RE 9",
+"HR1 :RH RE9M k&ERM 9HRT R9HT& R9lE lE:R R9lH :RlH R9d 9+Rd 9HRd gR9 9dR1 :R",
+"d R9H1d g:R 9MRd dk&RM 9TRd R9gM R9ld :Rld lHR9d gRl: R92 R2k& 92RB R29a R9",
+"5 :R5 RB95 R5:a R29M k&2RM R29T R9T&2 R9l5 l5:R 95RT s5:R R9; 9+R; RB9; 9aR",
+"; 95R; :>R R95;B :a>R 9MR; k;&RM 9TR; aM;R9 R9l; :Rl> l;R9T :>sR 9ER2 k&ER2",
+" R29H R9H&2 RE95 R5:E 9HR5 RH:5 R9ME2 R9EM&2 R9HT2 aM2R9H lR95E :R5lE lHR95",
+" :RHl5 9dR; dk&R; 9HR; R9g; 95Rd >R:d R9H1; :>gR R9dM; R9dM;& R9HT; gR9T; l",
+"dR95 l>:Rd lH;R9 g:Rl> R9P kP& RB9P 9PRa 9PR1 :RP kPB91 Ra:P S9 S9& S9T S9a",
+" Sl9 S: lTS9 S:s R(9P 9PR+ kP(9B akP9+ kP(91 R+:P 9P(R1B :R+aP S9( S9+ 9TS(",
+" 9+Sa l(S9 S:+ Sl9T( S+s: R9W 9WR& 9HRW 9WRa 9WR1 :RW R9H1W RH:W S9W 9WS& S",
+"Z9 Z9Sa S9lW S:W S9lZ S:Z 9WRd 9+RW dkP9H R9gP dkP91 R+:W 9HPR1d :RgP S9d 9",
+"+Sd Z9Sd gS9 S9ld S:d SZ9ld gS: R9m 9mR& RB9m 9aRm 95Rm :Rm R95mB Ra:m S9m ",
+"9mS& 9TSm 9aSm Sp9 S:p STp9 :pSs 9mR; 9+Rm k;P9B ak;9P k;P95 :R>P k;B95P :>",
+"Ram S9; 9+S; 9TS; 9aS; S9l; S:> Sp9T; s:S> 9WRm km&RW 9HRm km&RH 95RW R5:W ",
+"R9H1m RH:m 9WSm S9Wm& SmZ9 SZ9am SWp9 :WSp ZpS9 SZ:p vR9 R9v& R9vH vRg9 R9v",
+"1 :vR vR91H gR:v Sv9 v9S+ ZvS9 g9Sv S9lv S:v Sv9lZ y:S RUk U!Rk RDk DkRa R1",
+"U 1UR8 R1D 1URa UkRM RUkM! VRk RaVk lRU R8lU VlR VlsR UkR( RU+k R(Dk +kRD R",
+"(1U 1UR+ R(1D 1+RD RUkM( R+UkM RkV( R+Vk RUl( R+lU VRl( lRV+ UkRE RUk!E HkR",
+"D RHUak RE1U R1U8E 1URH R1HU8 RUkME U!kRME RHVk VRHak RUlE lRU8E VRlH lsVRH",
+" RUdk R+Udk DkRd RDgk 1URd R1+Ud 1DRd R1gU dkMRU R+UdkM RdVk VRgk RdlU l+RU",
+"d lRVd VlgR UkR2 RUk!2 R2Dk ak2RD 1UR5 R1U58 1DR5 R1D5a RUkM2 U!kRM2 RkV2 V",
+"2Rak R5lU lRU58 lRV5 lsVR5 RUk; R+Uk; DkR; ak;RD 1UR; R1>U 1DR; R1>D k;MRU ",
+"R+Uk;M R;Vk V+Rk; R;lU lR>U lRV; >RVl RUkE2 U!kRE2 RHUk2 RHUak2 R1U5E 1U5R8",
+"E R1HU5 1UHR5a UkMRE2 !ER2UkM V2RHk ak2VRH lRU5E R5Ul8E VlRH5 Vs5lHR dk;RU ",
+"R+Udk; RH;Dk gRUk; R1dU5 >kRUd R1HU; >kgRD RdUk;M dkR;U+M VdRk; gVRk; ldRU5",
+" l>RUd lH;VR V>lgR UPk U!kP DkP akUP 1UP U81P 1PRD Ua1P SUk U!Sk SVk VaSk S",
+"lU lUS8 SlV SVls U(kP +kUP D(kP Dk+P 1(UP U+1P R1DP( R1+DP UkS( U+Sk VkS( S",
+"kV+ SUl( lUS+ l(SV SVl+ WkUP kP!UW HkUP akPUH 1URW R1WU8 1WRD R1WUa UWSk S!",
+"UWk ZkSV SZVak SUlW SlUW8 SVlZ SlVsZ dkUP dkPU+ dkDP UPgk Ud1P dkPU8 dkP1D ",
+"1UgP UdSk S+UWk SkVd SVgk lUSd S8dlU SVld SlgV kmUP km!UP DkRm akmRD 1URm R",
+"1mU8 1DRm akPU5 UmSk S!Ukm SkVm SVakm pUSl SlpU8 SlVp SlVsp k;UP k;PU+ k;DP",
+" ak;UP U;1P 1U>P k;P1D Dk>P U;Sk S+Ukm SkV; SV+km lUS; >USl SVl; SlV> RWUkm",
+" RWUkm! RHmDk RWDakm R1WU5 1UWR8m R1HUm 1UHR8m SUWkm km!SUW SZVkm ZkVSam Sl",
+"pUW lWpS8U SlVZp VplSsZ UPvk vRU+k RDvk gvRDk R1vU >kvUP R1vD >kgUP SUvk Sv",
+"U+k vkSV VvgSk vUSl lv>SU SlVv SlyV tR tR& tRD tcR tR1 t:R R1tD :cR tRM R&t",
+"M VtR VtcR ltR :Rlt lRVt uR tR( t+R RDt( cRt+ R1t( :Rt+ tR1D( :+cR RMt( R+t",
+"M VRt( tRV+ tRl( lRt+ ltVR( uR+ tRE R&tE tHR cRtH R1tE tE:R R1tH :RtH RMtE ",
+"tRM&E VRtH tcVRH tRlE t:RlE lRtH uRH tdR R+td RHtd gtR R1td :Rtd tHR1d t:gR",
+" RdtM t+RdM tRVd VtgR lRtd t:dlR tdVlR ugR tR2 R&t2 RDt2 c2tR t5R :Rt5 R5tD",
+" cRt5 RMt2 tRM&2 tRV2 tcVR2 lRt5 t:Rl5 tRV5 uR5 t;R R+t; RDt; cRt; R1t; t>R",
+" t5RD; :Rc> R;tM t+RM; tRV; tc;VR lRt; >Rlt t5VR; u>R REt2 tR&E2 RHt2 tcRH2",
+" R5tE t:R5E RHt5 t:HR5 tRME2 M&EtR2 tHVR2 cRVtH2 t5RlE lt5:RE tH5lR RHu5 Rd",
+"t; t+Rd; RHt; t;gR R5td >Rtd tH5Rd gRt> tdRM; dM&t;R tH;VR gtVR; t5dlR t>lR",
+"d tH;lR g>uR tP tP& tPD tcP tP1 t:P 1DtP :ctP St St& StV Sct Stl S:t SVlt u",
+"S tP( t+P DPt( cPt+ 1Pt( :Pt+ tP1D( t:Pc+ St( St+ S(Vt tcS+ l(St l+St SlVt(",
+" uS+ tWR RWt& tHP cRtW R1tW :RtW 1HtP :HtP StW tWS& tZS tZSc lWSt tWS: lZSt",
+" uZS tdP R+tW HPtd gtP 1dtP :dtP tHP1d t:gP Std t+Sd SdtZ gtS ldSt t:Sd Std",
+"lZ ugS tmR Rmt& RDtm cRtm t5P :Rtm 5DtP cR:m Stm tmS& tmSV tmSc tpS tpS: Vp",
+"St upS t;P R+tm D;tP c;tP 1;tP t>P t5PD; tc>P St; t+S; t;SV S;tc l;St S>t S",
+"t;Vp u>S RWtm tWRm& RHtm tcWRm R5tW t:WR5 H5tP t:HRm SWtm StWm& tmSZ ScZtm ",
+"tWSp S:ptW SZtp SZup tvR vRt+ vRtH gRtv vRt5 >Ptv tvR1H >Pgt tvS S+tv StVv ",
+"tvgS Stlv tvS: lvVSt yuS )O !)O )BO a)O )O. 8)O )O.B a)8O )OK )O!K T)O a)TO",
+" jO) 8)jO T)jO s)O *O +*O *BO a*O *O. 8*O .B*O 8Oa* *OK *O+K T*O +OT* *jO j",
+"O8* jOT* s*O E)O E)!O H)O a)HO )OE. E)8O )OH. 8)HO )OEK !E)OK T)HO HTa)O E)",
+"jO jO8E) H)jO H)sO d*O d*+O H*O g*O *Od. d*8O *OH. 8*gO *OdK +d*OK HOT* T*g",
+"O d*jO dj*+O jOH* gOs* )O2 )O!2 )O2B )Oa2 5)O 8)5O )B5O a)5O )O2K !)2OK )OT",
+"2 Ta)O2 5)jO jO58) T)5O 5)sO ;*O ;*+O ;O*B ;*aO 5*O >*O 5O*B a*>O *O;K +;*O",
+"K ;*TO a;*TO jO5* *j>O 5OT* >Os* )OE2 !)2EO )OH2 Ha)O2 E)5O 58E)O 5)HO H58)",
+"O EK)O2 !)OEK2 HT)O2 Ta)HO2 jO5E) 58EjO) H5T)O sH5)O ;*dO +d;*O ;*HO ;*gO d",
+"*5O d*>O HO5* g*>O dK;*O dK;+*O H;T*O gT;*O dj*5O >*djO H5*jO s*Og> P) P)! ",
+"P)B aP) P). 8P) .BP) 8)aP QP) P)Q! TP) Q)aP Pj) Q)8P T)Pj sP) P* +P* P*B aP",
+"* P*. 8P* P.*B aP8* Q*P Q*+P TP* T*+P P*j 8PQ* PjT* sP* WP) P)W! HP) H)aP P",
+")W. W)8P P)H. H)8P QPW) Q!WP) ZP) aPZ) W)Pj Pj)W8 PjZ) ZPs) W*P W*+P HP* gP",
+"* W.P* 8PW* H.P* 8Pg* dPQ* +WQP* Z*P Z*gP P*Wj dPj8* P*Zj s*gP mP) P!m) P)m",
+"B mPa) 5P) 5)8P P)5B 5)aP mPQ) Q!mP) mPT) amPQ) pP) 8Pp) TPp) pPs) m*P m*+P",
+" *B;P m*aP 5P* >P* *B5P aP>* ;PQ* m*P+Q m*TP am*TP p*P p*>P TPp* s*>P mPW) ",
+"W!mP) mPH) amPH) WP5) 5W8P) H)5P H5P8) WQmP) WmPQ!) mPZ) ZamP) WPp) pW8P) p",
+"PZ) sP)Zp vP* +Pv* HPv* vPg* 5Pv* vP>* 5PH* >*gP Q*vP v+QP* vPZ* ZvPg* vPp*",
+" >Ppv* ZPp* y*P ,O ,&O ,OB ,aO ,O. ,8O .B,O 8a,O ,OK &O,K ,TO ,OT& ,jO ,O&j",
+" jO,T s,O ,*O -O ,O*B -aO *O,. -8O *B,O. 8a-O *O,K -OK ,OT* -TO ,O*j -jO *j",
+"O,T s-O ,EO &E,O ,HO ,OH& EO,. 8E,O HO,. ,OH8 EK,O ,&EOK HT,O ,HTaO jO,E &j",
+"E,O ,OHj ,HsO ,dO -dO ,OH* g-O dO,. 8d-O ,HdO. -8gO dK,O dK-O ,OTd gO-T ,Od",
+"j dj-O ,HjdO gOs- ,O2 &O,2 2B,O aO,2 ,5O ,O5& 5B,O ,O5a 2K,O ,&O2K TO,2 ,Ta",
+"O2 jO,5 &jO,5 ,O5T ,5sO ,;O -;O ;O,B a;-O ,O5* ->O ,5;OB -a>O ;O,K ;O-K ,OT",
+"; T;-O ,O;j >O-j ,5T;O >Os- EO,2 ,&EO2 HO,2 ,HaO2 5E,O ,58EO ,OH5 ,H58O ,EO",
+"2K &EO,2K ,HTO2 H&O,T2 ,5jEO ,5E&jO ,H5jO s,H5O d;,O d;-O ,OH; -;gO ,O5d -d",
+">O ,H5dO >Og- ,d;OK -d;OK ,H;TO -T;gO ,5djO ->djO ,H;jO s-g>O ,P ,P& ,PB ,a",
+"P ,P. ,8P P.,B 8P,a ,QP Q&,P ,TP Qa,P ,Pj Q8,P TP,j sP, ,P* -P *B,P -Pa ,.P",
+"* -P8 P*.,B 8P-a Q*,P -QP T*,P -TP P*,j -Pj P*j,T s-P ,WP W&,P ,HP HP,a WP,",
+". W8,P ,.HP H8,P WQ,P ,WQP& Z,P ,aZP Wj,P P&j,W ,PZj Z,sP ,dP -WP HP,d g-P ",
+",.dP W8-P ,HPd. g8-P Qd,P Qd-P ,dZP Z-P dP,j Wj-P Z*P,j gPs- ,mP m&,P mP,B ",
+"am,P ,5P 5P,8 ,B5P 5a,P Qm,P m&P,Q Tm,P ,QamP p,P ,8pP ,TpP p,sP ,;P -mP ,B",
+";P am-P 5P,; >P- ,5P*B -a>P Q;,P Q;-P T;,P Tm-P ,;pP -pP p*T,P >Ps- Wm,P m&",
+"P,W Hm,P ,HmaP 5W,P ,5W8P H5,P ,H58P ,WQmP ,WQm&P ,mZP Z&m,P ,WpP p&W,P ZPp",
+", sP,Zp v,P -vP ,HvP gP-v ,5vP >P-v v,H5P g->P ,QvP vQ-P ZPv, -PZv pPv, pv-",
+"P Zp*,P y-P C)O C)!O D)O a)DO )OC. C)8O )OD. 8)DO )OCK !CO)K T)DO DTa)O C)j",
+"O jO8C) D)jO D)sO *CO *C+O D*O +OD* CO*. *C8O *OD. DO8* CK*O +*COK DOT* a*O",
+"DT *CjO *jC+O jOD* D*sO E)CO CE)!O D)HO HDa)O C).EO 8CE)O HD)O. H8D)O CE)OK",
+" EK)!CO HDT)O DTaH)O jOCE) 8CEjO) HjD)O sHD)O *CdO +d*CO HOD* D*gO d*CO. 8d",
+"*CO H*DO. gD8*O dK*CO dK*+CO H*DTO gDT*O dj*CO 8dC*jO H*jDO s*DgO )OC2 !)2C",
+"O )OD2 Da)O2 C)5O 58C)O D)5O 5D8)O 2KC)O CKO!)2 DT)O2 Ta)DO2 jO5C) 58CjO) 5",
+"DT)O s5D)O *C;O +;*CO ;*DO a;*DO *C5O *C>O 5OD* D*>O ;*COK ;*C+OK D;T*O D;T",
+"a*O ;jC*O >*jCO 5D*jO >D*sO CE)O2 !O2CE) HD)O2 Da)HO2 5CE)O 8CE5)O H5D)O 5D",
+")H8O C)OEK2 C)!OEK2 DT)HO2 DTH)aO2 5CEjO) 5)jO8CE 5D)HjO H5Ds)O d;*CO d;*+C",
+"O H;D*O gD;*O 5d*CO >*dCO H5*DO >D*gO ;*CdKO dK+*;CO D;TH*O D;Tg*O 5dC*jO d",
+"j*>CO djO5D* gs*>DO PC) !CP) DP) D)aP C)P. PC8) P)D. D)8P PCQ) Q!PC) Q)DP a",
+"P)QD jCP) PjC8) D)Pj DPs) P*C +CP* DP* D*+P *CP. 8CP* D.P* 8PD* QCP* P*C+Q ",
+"DPQ* aP*QD PC*j P*j+C P*Dj DPs* PCW) W!PC) H)DP aP)WD WPC). W8PC) HPD). H8P",
+"D) WQPC) WPCQ!) DPZ) ZDaP) PjCW) W8CPj) ZDPj) sPDZ) WCP* dPC+* DPH* DPg* dP",
+"C*. W8*PC HP*D. gPD8* dPCQ* +WQP*C DPZ* Z*DgP dPj*C dPCQ8* Z*DPj sP*gD PCm)",
+" mPC!) mPD) amPD) PC5) 5P8C) 5)DP 5DP8) QmPC) mPCQ!) QDmP) QDmaP) PCp) p8PC",
+") DPp) sPDp) mCP* m*P+C m*DP am*DP 5CP* P*>C DP5* DP>* m*PQC +QmP*C QD;P* Q",
+"D;aP* P*pC >Pp*C DPp* sP*pD WmPC) mPCW!) HmDP) HmDaP) 5WPC) W8C5P) H5PD) aP",
+")5WD QmPWC) W)Q!mPC ZDmP) amPZD) pWPC) W8PpC) ZpDP) ZpDsP) P*vC v+P*C DPv* ",
+"gvDP* v5P*C >Pv*C vD5P* >PgD* vQP*C P*Cv+Q ZvDP* gvDZ*P pvP*C pv*>PC Zp*DP ",
+"DPy* ,bO b&,O ,DO c,O bO,. ,Ob8 DO,. ,8cO bK,O ,b&OK ,ObT ,TcO ,Obj &jO,b ,",
+"ODj c,sO b*O -bO ,OD* c-O *Ob. b8-O ,D*O. -8cO *ObK bK-O bOT* cO-T jOb* bj-",
+"O ,Dj*O sOc- bE,O ,b&EO ,ObH ,HcO ,bEO. ,8bEO ,HbO. cH8,O ,bEOK bK&,EO ,HbT",
+"O cHT,O ,jbEO b8E,jO ,HjbO s,HcO ,Obd bd-O ,ODd gOc- ,dbO. -b8dO ,DdO. c-8g",
+"O ,dbOK -bdOK ,DdTO c-TgO ,djbO -jbdO ,DdjO s-gcO bO,2 ,b&O2 DO,2 ,Oc2 ,Ob5",
+" ,5b8O ,O5D ,5cO ,bO2K bK&,O2 ,DTO2 c2T,O ,5bjO ,5b&jO ,5DjO s,5cO ,Ob; b;-",
+"O ,OD; -;cO bO5* -b>O ,5D;O >Oc- ,;bOK -b;OK ,D;TO c-T;O ,;jbO ->bjO ,D;jO ",
+"s-c>O ,bEO2 b&E,O2 ,HbO2 c2H,O ,5bEO b5E,8O ,H5bO c5H,O bKE,O2 EO,2bK& bHO,",
+"T2 ,HTc2O b5E,jO 5jbE,8O ,HOb5T c5Hs,O ,db;O -bd;O ,H;bO c-;gO ,5dbO ->bdO ",
+",5DdO c>g-O bdO,;K bd;-OK ,HObT; -T;gcO djOb5* >bd-jO djO,5D c>gs-O ,Pb ,bP",
+"& ,DP cP, ,.bP b8,P ,.DP ,8cP bQ,P ,QbP& bT,P ,QcP bP,j P&j,b DP,j cPs, bP*",
+" -Pb DPb* c-P b.P* b8-P ,DP*. c8-P Q*bP bQ-P TPb* -QcP P*bj bP-j P*j,D c-sP",
+" bW,P ,WbP& bH,P ,HcP ,WbP. ,W8bP ,HPb. cW8,P ,WbQP bWQ,P& ,DZP cPZ, ,WjbP ",
+"bW8,Pj ZbP,j sP,Zc bd,P bW-P HPb* c-gP ,dPb. -Wb8P ,DdP. c-W8P ,QdbP -WbQP ",
+"bPZ* cPZ- dPjb* -WjbP Zb*Pj s-PZc bm,P m&P,b Dm,P ,mcP b5,P ,5Pb8 5D,P ,5cP",
+" ,QbmP ,Qbm&P ,QDmP cQm,P ,Ppb pb8,P ,DpP p,cP b;,P bm-P D;,P -mcP 5Pb* >b-",
+"P ,5D;P c->P ,Q;bP -Qb;P ,QD;P c-Q;P bPp* pb-P pb*DP cP-p ,WbmP ,Wbm&P ,Hmb",
+"P cWm,P ,5WbP b5W,8P ,H5bP c5W,P bWQ,mP QmP&,Wb Zbm,P ZcP,m pbW,P ,W8pbP Zp",
+"b,P cpZ,P ,Pvb vb-P ,DvP cP-v vb5,P -v>bP vD,5P cv->P vbQ,P -vbQP Zvb,P cvZ",
+"-P pvb,P -pvbP ZpbP* c-yP 0)O 0)!O 0)OB 0)aO 1)O 8)1O )B1O a)1O )O0K !K0)O ",
+"0)TO Ta0)O 1)jO jO18) T)1O 1)sO *0O *0+O 0B*O *0aO 1*O 1O8* 1O*B 1Oa* 0O*K ",
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+"2 ,RbM&2 ,RV2 cRV,2 ,R5bM Rb5,8M ,RV5 s,VR5 Rb,; Rb-; RD,; -Rc; b5R* >R-U ,",
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+" Rn(.B R+8an Mn( +Mn R(Tn +nRT R(nj +nRj Mn(Tj R+sn RnE n!RE RHn HnRa nER. ",
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+"aMn+& Mn#j( M&n+j RT#nj( sn+R& n#RE RE&n R#Hn HnR& Rn#E. &nER8 RHn#. RH8&n ",
+"n#ME ME&n H#Mn M&Hn Mn#jE M&n8E RHjn# snHR& R#dn dnR& dn#RH R&gn dn#R. d&nR",
+"8 RH#dn. gR8&n d#Mn M&dn dMnH# M&gn dMnj# dM&8n dM#Hnj gsR&n R4# R4& 4#RB 4",
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+"Tn >Mns& 4#RE RE4& R#4H 4HR& R45#E R48&E R4H5# R4H5& Mn#4E M&n4E R4HT# M&n4",
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+"&nR8 Pn#R.B R8aP&n Sn# S&n TnS# T&Sn njS# 8nS& STnj# S&sn RPn#( P&nR+ Pn#R(",
+"B R+aP&n Pn#R(. R+8P&n .BR(Pn# aP8nR+& n#S( +nS& STn#( S+T&n Snj#( S+8&n nj",
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+"nS& SWnj# S8W&n SZnj# SZ&sn dP#Rn dP&Rn RHWdn# gRW&n RW#dn. RW8d&n dPHnR#. ",
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+"&go Svop# Sv&o> oZpSv# Soy& Un Un! RDn Uan Un. U8n R.Dn D8Un UnM U!Mn Vn Vn",
+"a Unj 8MUn Vnj snV Un( U+n R(Dn +DUn n(U. +nU8 RDn(. R+D8n U(Mn +MUn Vn( V+",
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+"Wnd. W8-n <d.,HP -Wng8 Qd,n Wn-Q ,dZn Z-n <dj,P Wn-j Zn*,j snZ- o, o&< o,B ",
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+"- o5v, -vo> ov,H5 g-o> oQv, -Qov ovZ, Z-o pvo, op-v oZ,p= yo- <nC <Cn! D<n ",
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+"C<E n!<CE D<Hn H<Dan <nCE. 8<nCE H<Dn. H8<Dn <nCEK <CEn!K H<DTn D<aHnT <jnC",
+"E 8<CnjE H<jDn s<HDn <Cdn <dn+C DnH* D<gn <dnC. 8<dnC Hn*D. g<D8n <dnCK +<C",
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+"<5n 4D8<n 4<nCK n!<4CK 4DT<n D<a4Tn <jn4C 48<njC 4Dj<n s<D5n =nC +n=C =Dn +",
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+"<CnjE <j5n8CE 5D<Hnj H5<snD dn=C =+dnC Hn=D gn=D =5dnC >n=dC =H5Dn g=>Dn =d",
+"nCK dnC=+K =HDTn g=DTn =jdnC =jd>nC =HjDn s=gDn <PC <!PC D<P a<DP PC<. 8C<P",
+" D.<P 8<DP QC<P <PCQ! D<Qn QD<aP <CPj <Pj8C <PDj D<sP <CP* +C<P <PD* D<+P <",
+"P*C. +<P8C D<P*. +D<8P QCn* +Q<PC DnQ* an*QD <Pj*C <Pj+C <PjD* s<P+D WC<P <",
+"PCW! D<HP H<PDa <PCW. W8<PC H<PD. H8<DP <PCWQ Q<CWn! D<Zn Z<DaP <PjWC <jCW8",
+"n Z<DPj s<PZD WCn* +W<PC DnW* D<gP Wn*C. W8n*C WDn*. g<PD8 Wn*QC <dC+Qn DnZ",
+"* Zn*gD <djPC <dC+Pj Zn*Dj s<PgD o<C <Co! oD< D<oa 5<oC 8<oC 5Do< D8o< Q<oC",
+" o!Q<C QDo< oDQa< oCp< op8<C p<oD oDs< o=C =Co+ =Do o+=D o5=C >Co= =5oD =Do",
+"> oQ=C o=+QC oD=Q o+D=Q =Cop o>p=C op=D =Dos W<oC o!W<C H<oD oHDa< o5W<C o8",
+"W<C oH5D< oH8D< oWQ<C W<Qo!C oDZ< oZDa< opW<C p<Wo8C Zp<oD osZD< =Cov ov=+C",
+" ov=D =Dgo ov=5C o>v=C ovD=5 go>=D ov=QC =Qvo+C =DoZ goZ=D p=ovC p=vo>C p=D",
+"oZ =Dyo ,nb <&bn ,Dn c<n ,.bn b8,n ,.Dn ,8cn ,Kbn <&Kbn bT,n ,Tcn bn,j <&jb",
+"n Dn,j c<sn bn* -nb Dnb* c-n b.n* b8-n ,Dn*. c8-n bKn* bn-K Tnb* -Tcn n*bj ",
+"bn-j n*j,D c-sn ,Ebn <&Ebn bH,n ,Hcn ,nbE. ,8nbE ,Hnb. c<H8n ,nbEK b<E&nK ,",
+"HnbT c<HTn ,njbE <&Ebnj ,Hnbj sn,cH bd,n bd-n Hnb* c-gn ,dnb. -nb8d ,Ddn. c",
+"-ng8 ,dnbK -nbdK ,DdTn c-ngT <djbn -njbd dnj,D s-ngc 4b,n ,4b&n 4D,n ,4cn b",
+"5,n ,48bn 5D,n ,5cn ,4bnK ,4b&nK ,4DTn c4T,n ,4jbn 4b8,nj ,4Dnj sn,c4 =bn -",
+"n=b ,D=n c=n b5=n =b>n =b5Dn >nc= bn=K =b-nK bT=n cn=T bn=j >n-bj =bT5n snc",
+"= ,4bnE ,4b&nE ,4Hbn c4H,n ,5nbE <&Eb5n ,H5bn c5<Hn 4bE,nK <&bn4EK 4bH,Tn ,",
+"4HcnT <jEb5n &n4jb<E 4bH,nj s<Hc5n bd=n =b-dn bH=n gnc= =b5dn >n-bd =bH5n c",
+"=g>n =bdnK -nd=bK =bHTn c=gTn =bjdn >nd=bj =bHnj s=cgn b<P <&bP D<,P c<P b.",
+"<P 8<bP ,DP<. 8<cP bQ,n <P&bQ QD,n ,Qcn <Pbj <P&bj <Pj,D c<sP <Pb* b<-P ,DP",
+"n* -Pc< b<P*. -Pb8< P*.,Dn c-P8< Qnb* bQ-n ,QDn* -Qcn <Pjb* -Qnb8 ,QDn*j s-",
+"Pc< bW,n <P&bW H<bP ,Wcn ,Wnb. ,W8bn ,WDn. cW<8P ,WnbQ W<&bQn ,DZn c<Zn <Pj",
+"bW bW8<Pj Zb<Pj Zc<sP Wnb* bW-n ,WDdn c<gP bWn*. -Wnb8 <d.,DP c-W8n ,Qdbn -",
+"WnbQ bnZ* c-Zn <djbP -Wnbj Zbn*j Z-nsc ob< b<o& oD, oc< ,5ob ,8ob ,5oD o8c<",
+" ,Qob obQ<& ,QoD oTc< pbo, opb,8 pDo, s<oc =bo o-b ob=D oc- =5ob =bo> =bo5D",
+" c>o- ob=Q -Qob ob=T =Qoc op=b ob-p p=boD ocs= ,Wob obW<& ,Hob oHc< ob5,W o",
+"b8,W obH,5 ocH,5 obW,Q bW<o&Q obZ< Z<oc opb,W obWp<& oZbp< oscZ< ov=b ob-v ",
+"ob=H c=go ovb=5 o-v>b ovD,5 cv=o> ovb=Q o-vbQ =boZ ocZ- p=bov o-pvb Z=bop o",
+"cy- 6<n n!6< <n6B 6<an 1<n 8<1n <n1B a<1n <n6K 6!<nK 6<Tn 6Ta<n <j1n <jn68 ",
+"T<1n 1<sn 6*n +n6* 6n*B an6* 1n* +<1n *B1n an1* 6Kn* n*K6+ Tn6* an*6T n*6j ",
+"n*j6+ Tn1* 6*sn <n6E 6!<nE 6<Hn 6Ha<n <n1E 68<nE H<1n 6H8<n 6<nEK n!<6EK 6H",
+"T<n H<T6an <jn6E 68<njE 6Hj<n s<H1n dn6* <dn6+ Hn6* 6*gn <d1n 68dn* Hn1* 1<",
+"gn <dn6K 6+<dnK 6H*Tn g6Tn* <dj1n 68dn*j n*j6H sn*g6 6<4n 6!4<n 46<nB 4a6<n",
+" 7<n 8<7n <n7B a<7n 46<nK 4<n6!K 4T6<n 6T<4an <j7n 78<nj T<7n 7<sn =6n 6+=n",
+" 6n=B 6a=n 7=n 7=>n =n7B =n7a 6n=K =6+nK 6T=n =T6+n 7n=j 7>=nj =n7T 7=sn 46",
+"<nE 4<n6!E 4H6<n 6H<4an <n7E 78<nE H<7n 7H8<n 6<n4EK 4<6!nEK 6H<4Tn a<Hn4T6",
+" 7<njE <jn78E 7HT<n 7sH<n 6d=n =6+dn 6H=n =6gn =n7d 7>=dn =n7H 7=gn =6dnK d",
+"nK=6+ =H6Tn g=6Tn 7=dnj >n=7dj 7Td=n g7s=n 6P< 6!<P 6B<P a<6P 1<P 8<6P 1B<P",
+" a<1P Q<6P <P!6Q T<6P 6Qa<P Q<1P <Pj68 T<1P 6Ps< 6P* +<6P *B6P aP6* 1P6* +<",
+"1P 6P*1B aP*68 Qn6* 6+Q<P TP6* aP*6Q Qn1* <Pj6+ P*j6T 6Ps* W<6P <P!6W H<6P ",
+"6HPa< W<1P 6W8<P H<1P 6H8<P 6WQ<P 6WQ<P! 6PZ< Z6a<P <Pj6W 6W8<Pj 1<Zn s<PZ6",
+" Wn6* 6+W<P HP6* 6Pg< Wn1* 6W8P* 6HP1* 1<gP 6W*Qn +Wn6Q* 6PZ* Z6*gP <dj6P 6",
+"+W<Pj 1nZ* s<Pg6 o6< 6!o< 6<oB 6ao< 7o< 7<o8 o<7B 7<oa 6Qo< o!6Q< 6To< oT6a",
+"< p<7o 7op8< 7<oT 7os< o=6 =6o+ o6=B =6oa 7o= 7=o> =B7o 7o=a o6=Q o=6+Q =6o",
+"T o+T=6 7op= 7o=p> 7o=T 7os= 6Wo< o!6W< 6Ho< oH6a< oW7< 7oW8< 7<oH 7oH8< o6",
+"WQ< 6WQo!< o6Z< oZ6a< 7opW< op87W< Z<7o osZ7< v6o= ov=6+ =6oH o=g6 ov7= 7o=",
+"v> 7o=H 7og= ov=6Q =Qvo+6 o=Z6 goZ=6 7o=pv o>p7v= 7oZ= 7oy= ?n ?&n ?Bn ?an ",
+"?1n ?:n 1n?B :n?a ?nK &n?K ?Tn T&?n ?jn :n?j 1T?n s?n ?n* ?-n n*?B -n?a 1n?",
+"* :-n ?B1n* :a-n n*?K ?K-n Tn?* -n?T n*?j -n?j ?T1n* ?-sn ?nE &n?E ?Hn H&?n",
+" 1n?E ?E:n 1H?n :n?H nE?K ?&nEK Hn?T ?HTan nj?E ?:njE Hn?j ?Hsn ?dn -n?d Hn",
+"?d g?n 1d?n :n?d ?H1dn ?:gn dn?K ?-dnK Td?n ?Tgn dn?j ?:dnj ?Hjdn gns? ?4n ",
+"4&?n 4n?B 4a?n 7?n :n7? ?n7B ?n7a 4n?K ?4&nK 4T?n ?T4an 7n?j ?:7nj ?n7T 7?s",
+"n ?=n -n?= ?B=n =n?a =n7? An ?=7nB Aan ?n=K ?-=nK =n?T ?-T=n =n?j Ajn ?T7=n",
+" Asn 4n?E ?4&nE 4H?n ?H4an 7n?E ?:7nE ?n7H ?:H7n ?4nEK &nE?4K ?H4Tn 4H&?Tn ",
+"?j7nE 7:n?jE ?H7Tn s?7Hn =n?d ?-=dn =n?H ?=gn ?n7d Adn ?H7=n Agn ?=dnK -=n?",
+"dK ?Td=n g?=Tn ?d7nj dnAj ?Hj=n gsAn ?P ?P& ?PB ?aP ?P1 ?:P 1P?B :P?a ?QP Q",
+"&?P ?TP Qa?P ?Pj :Q?P 1T?P s?P ?P* ?-P P*?B -P?a 1P?* :-?P ?P1*B ?:P-a Qn?*",
+" -Q?P TP?* -T?P P*?j -Q:n ?TP1* ?-sP ?WP W&?P ?HP HP?a 1W?P :W?P 1H?P :H?P ",
+"Wn?Q ?WQP& ?ZP Z&?P Wn?j ?:WQn Z1?P sP?Z ?dP -W?P HP?d g?P 1d?P :d?P ?HP1d ",
+"?:gP Qd?P ?-WQn Zn?d gP?Z dP?j ?:QdP ?Z1dP gPs? o? o?& o?B o?a o?7 o:? 7Bo?",
+" ?ao: o?Q o&?Q o?T oT?a ?po o:?p 7o?T s?o o?= o-? =Bo? =ao? 7o?= Ao 7o=?B A",
+"oa =Qo? ?Qo- =To? ?To- p=o? Aop o?Tp= Aos o?W o&?W o?H oH?a 7o?W ?Wo: 7o?H ",
+"?Ho: oW?Q o?WQ& ?Zo ?aoZ op?W o:?pW o?7Z os?Z ?vo o-?v =Ho? go? o?7v Aov o?",
+"H7v Aog ov?Q o-?vQ o?Z= ?Zgo op?v opAv ?Zo7v yAo <n6C 6!<nC 6<Dn 6Da<n <n1C",
+" 68<nC D<1n 6D8<n 6<nCK n!<6CK 6DT<n D<a6Tn <jn6C 68<njC 6Dj<n s<D1n 6Cn* n",
+"*C6+ Dn6* an*6D 1Cn* 68*nC Dn1* an*1D n*C6K 6+Cn*K 6D*Tn +Dn6T* n*j6C <jC1+",
+"n n*j6D sn*6D 6<nCE n!<6CE 6HD<n H<D6an 1<nCE 8<C1nE 1H<Dn H8<1Dn <nC6EK EK",
+"<!6nC H<D6Tn a<Hn6DT 1<CnjE <j1n8CE H<j1Dn 1H<snD <dn6C 6+<dnC 6H*Dn g6Dn* ",
+"1<dnC <dC1+n 1HnD* g1<Dn 6dCn*K <d+n6CK Ddn6T* 6D*gnT <jC1dn <d6j+nC 6Ddn*j",
+" s<Dg1n 46<nC 4<n6!C 4D6<n 6D<4an <n7C 78<nC D<7n 7D8<n 6<n4CK 4<6!nCK 6D<4",
+"Tn a<Dn4T6 7<njC <jn78C 7DT<n 7sD<n 6n=C =6+nC 6D=n =D6+n 7n=C 7>=nC =n7D 7",
+">D=n =6nCK 6+n=CK =D6Tn 6+D=Tn 7=njC >nj7=C =D7Tn s=7Dn 6<n4CE 4<6!nCE 6H<4",
+"Dn a<Hn4D6 7<nCE 8<n7CE 7HD<n H8<7Dn 6<4nEKC 6n4CEK<! T<Hn4D6 46T<HDan <jn7",
+"CE <j7n8CE H<j7Dn 7HDs<n =6dnC dnC=6+ =H6Dn g=6Dn 7=dnC >n=7dC 7Dd=n g7=Dn ",
+"dnC=6K dn=C6+K 6Dd=Tn g6D=Tn =jn7dC >j7d=nC 7Hn=Dj s=Dg7n 6C<P <PC6! D<6P 6",
+"DPa< 1C<P 68P<C D<1P 6D8<P <PC6Q 6QC<P! 6QD<P QD<6aP <Pj6C <PC6Q8 <Pj6D s<P",
+"6D 6CP* 6+P<C DP6* aP*6D 6P*1C 68P*C 6DP1* 6D8P* 6Q*PC <PC6+Q 6QDP* 6QDaP* ",
+"P*j6C <PC6+j P*j6D sP*6D <PC6W 6WC<P! 6HPD< WD<6aP 1W<PC <PC6W8 1H<DP H8<6D",
+"P 6WQ<PC QC<P6W! Z6D<P 6DPZ<a <PC6Wj <PWj68C Z1<DP s<DZ1n 6W*PC <dC6+P 6HPD",
+"* g6PD< 1Wn*C <dC68P 1WDn* g1<DP <PC6Qd 6C+WQn* Z6*DP Z6Dg<P <dC6Pj dP<j6+C",
+" Z1nD* s<Dg6P 6<oC o!6<C 6Do< oD6a< o<7C 7o8<C 7<oD 7oD8< o6Q<C 6Q<o!C oD6Q",
+"< 6QDoa< 7op<C o8<7pC 7oDp< os7D< o6=C o=6+C =6oD o+D=6 =C7o 7o=>C 7o=D o>D",
+"7= o=6QC =Q6o+C =QDo6 o+6=QD 7o=pC p=7o>C p=D7o s=o7D o6W<C 6W<o!C oH6D< 6W",
+"Doa< 7oW<C o8<7WC 7oHD< 7H<oD8 6WQo<C Q!oW6<C oZ6D< oD6Z<a op<7WC 78p<oWC 7",
+"ZoD< 7ZDos< ov=6C v=6o+C ovD=6 go=6D 7o=vC o>=7vC 7vDo= go7=D =Q6ovC =6o+vQ",
+"C Z=o6D Z=6goD p=o7vC >C7vp=o 7Z=oD yo7=D ?bn bn?& ?Dn ?cn b1?n ?b:n 1D?n :",
+"n?c bn?K ?b&nK bT?n cn?T bn?j ?:bnj Dn?j sn?c bn?* ?b-n Dn?* cn?- 1nb* :b-n",
+" ?D1n* c-:n ?bn*K ?-bnK ?DTn* ?-Tcn ?jbn* ?-jbn ?Djn* s-n?c bn?E ?b&nE bH?n",
+" cn?H ?b1nE ?:bnE ?Hb1n ?:Hcn ?bnEK &nE?bK ?HbTn ?cHTn ?jbnE :nb?jE ?Hjbn s",
+"?cHn bd?n ?-bdn Dd?n gn?c ?d1bn ?:dbn ?Dd1n g:n?c ?dbnK -nb?dK ?DdTn g?cTn ",
+"?djbn ?db-nj ?Ddnj g?scn 4b?n ?4b&n 4D?n ?4cn ?n7b ?:7bn ?n7D cn7? ?4bnK &n",
+"K?4b ?D4Tn ?c4Tn ?j7bn 7:b?jn ?D7Tn s?7cn ?b=n ?-=bn =n?D cn?= =n7b Abn ?D7",
+"=n Acn ?=nbK =bn?-K =bT?n c=?Tn =b7nj bnAj ?Dj=n scAn ?4bnE &nE?4b ?H4bn ?c",
+"4Hn 7?bnE 7bn?:E ?H7bn 7c?Hn 4bn?EK &n?E4bK 4bH?Tn c4H?Tn 7bn?jE 7j?E:nb ?H",
+"n7bT 7cHs?n ?=dbn =b-?dn ?Dd=n c=?gn ?d7bn bdAn ?D7dn gcAn =bn?dK =d-n?bK ?",
+"Hn=bT g?Tc=n ?dn=bj Adnbj ?Hn=bj Agnsc ?Pb bP?& ?DP ?cP b1?P ?b:P 1D?P :c?P",
+" bQ?P ?QbP& bT?P cQ?P bP?j ?:QbP DP?j sP?c bP?* ?b-P DP?* c-?P ?Pb1* ?:P-b ",
+"?DP1* ?cP:- ?QbP* ?-QbP ?QDP* ?cQ-P ?Pjb* ?-Pbj ?DP*j s?Pc- bW?P ?WbP& bH?P",
+" cW?P ?Wb1P ?:WbP ?HPb1 ?cW:P ?WbQn bWn?Q& Zb?P ?PZc ?WjbP ?Wb:Qn ?Zb1P s?Z",
+"cP bd?P ?-WbP Dd?P gP?c ?dPb1 ?:dbP ?Dd1P g?P:c ?QdbP ?Wb-Qn ?ZbdP g?ZcP ?d",
+"Pbj ?Wb-Pj ?DdPj g?scP o?b ?bo& o?D oc? 7bo? ob?: 7o?D ?co: ob?Q o?bQ& ob?T",
+" ?Qoc ob?p o:?pb op?D ocs? =bo? ob?- =Do? ?co- 7o=b Aob o?D7= Aoc o?=bQ o-?",
+"bQ o?D=Q oc?=Q p=bo? opAb ?pDo= osAc ob?W o?bW& ob?H ?Hoc ?W7ob o:?bW o?H7b",
+" o:H?c o?bWQ obW?Q& ?DoZ oc?Z ?pobW ?pbo:W ?Zo7b s?oZc ob?v o-?vb ov?D ocg?",
+" 7vbo? ovAb ?vD7o goAc ?vobQ ?vbo-Q ?Zo=b go?Zc ?pvob Aopvb ?pvoD yoAc R< R",
+"<! R<B Ra< R<. R8< <.RB 8<Ra R<M R!<M RT< T<Ra R<j 8<Rj T<Rj sR< R<* R+< *B",
+"R< +<Ra R.n* +<R8 n*.RB an*R8 Mn* +MR< T<R* +TR< <jR* +<Rj Mn*Tj R+s< R<E <",
+"ER! RH< H<Ra <ER. RE8< R.H< H8R< RE<M <MER! H<RT aMnH< RE<j R8<ME H<Rj RHs<",
+" R<d +<Rd H<Rd gR< R.<d 8<Rd RH<d. R8g< <MRd <dMR+ T<Rd RTg< <dRj <dMR8 <dj",
+"RH sRg< R4< 4!R< 4<RB 4aR< R5< 48R< RB5< 5aR< 4MR< <M!R4 4TR< aMn4< 4jR< R4",
+"8<M 5TR< R4s< =R =R+ =RB =Ra =R5 =R> R5=B >R=a =RM R+=M =RT R+=T =Rj =R>M R",
+"5=T s=R 4<RE R4<!E 4HR< R4Ha< RE5< R48<E H5R< R4H8< <MER4 R4E<M! R4HT< 4HMR",
+"a< R4j<E <MER48 R4H<j sR4H< =Rd R+=d =RH g=R R5=d =d>R RH=5 g>=R Rd=M =R+dM",
+" RH=T gR=T Rd=j >M=Rd RH=j gs=R R<P R!<P RB<P aPR< R.<P 8PR< <P.RB R8<aP S<",
+" S<! S<T Sa< S<j S8< T<Sj Ss< <PR* +PR< <P*RB aP*R< <P*R. R+<8P R<.P*B R8<a",
+"P* S<* S+< T<S* +TS< <jS* +<S8 S<T*j S+s< RW< R!W< H<RW WaR< R.W< W8R< RH<W",
+". RH8W< S<W W<S! SZ< Z<Sa W<Sj W8S< SjZ< s<SZ W<Rd +WR< RH<W* RWg< RW<d. R+",
+"W8< <P.RH* gR<W8 S<d +WS< Z<Sd gS< <dSj 8<Sd SZ<dj g<Ss oR< R<o! R<oB Rao< ",
+"R5o< R8o< oR5<B o8Ra< So< o!S< oTS< oaS< Sp< o8S< STp< s<So =Ro o+=R oR=B o",
+"a=R oR=5 =Ro> o=5RB o>=Ra S= S=+ S=T S=a S=p S>= Sp=T s=S RWo< o!RW< RHo< o",
+"HRa< 5WR< o8RW< oHR5< oH8R< oWS< S<Wo! S<oZ SZ<oa SWp< Sp<W8 ZpS< osZS< =Rv",
+" =+vR oH=R =Rgo =5vR v>=R =RvH5 g=Ro> S=v v=S+ S=Z gS= p=Sv v>S= SZp= y=S ,",
+"R< R<& RB,n Ra,n ,.R< R8,n ,R<.B ,R8a< ,Mn <MR& RT,n T<R& R<,j 8M,n ,RT<j ,",
+"Rs< R*,n -R< n*B,R Ra-n n*.,R R8-n ,R.n*B -R8a< M*,n -Mn Mn*,T RT-n Mn*,j R",
+"<-j ,RTn*j -Rs< ,ER< RE<& RH,n H<R& ,R<E. ,R8<E ,RH<. ,RH8< ,EMn <M&RE HM,n",
+" aMn,H ,Rj<E <&jRE ,RH<j sn,RH R<,d R<-d ,RH<d -Rg< ,Rd<. -R8<d <d.,RH g-R8",
+"< dM,n dM-n dMn,H -Mgn <dj,R -Rj<d ,RH<dj s-Rg< ,R4 R&,4 RB,4 R4,a R4,5 R4,",
+"8 ,R45B ,R45a R4,M <M&R4 R4,T aMn,4 R4,j <M&R5 ,R45T ,Rs4 =R, =R- ,R=B -R=a",
+" ,R=5 ->=R =R5,B >n-Ra ,R=M -R=M ,R=T -R=T ,R=j -R=j =RT,5 =Rs- ,ER4 ,R4&E ",
+"R4,H ,R4H& ,R45E ,R48E ,R4H5 ,R4H8 ,R4ME <MER4& ,R4HM ,4HaMn ,R4jE <MER5& ,",
+"R4Hj sR4,H ,R=d =d-R ,R=H g-=R =R5,d >n-Rd =RH,5 g=R-> =Rd,M =R-dM =RH,T g=",
+"R-T =Rj,d >M-dn =RH,j s=Rg- R<,P <PR& <PB,R <P&Ra <P.,R <P&R8 ,R.<PB R8<,aP",
+" S<, S<& ,TS< ,aS< ,nSj ,8S< S<T,j S<s, <P*,R R<-P ,R<P*B -Ra<P ,R<P*. -R8<",
+"P <PR*,.B R8<-Pa ,nS* S-< S<T,* -TS< S<*,j -nS8 n*jS,T s<S- RW,n W<R& ,RHW<",
+" <P&RH ,RW<. ,RW8< <P.,RH RH8<P& ,WS< W<S& Z<S, Z<S& S<W,j S8<,W SZ<,j Ss<Z",
+"& ,RW<d RW-n RH<,dP -RWg< <d.,RW -RW8< ,.RHWn* -R8g<P ,dS< -WS< SZ<,d g<S- ",
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+"o zo& zoD zoc zo7 zo: 7ozD 7czo zoS Soz& zoV Sczo zr zr: zrV uzr zo= zo- =D",
+"zo ocz- 7oz= Azo zo7=D zoAc z=S S-zo S=zV Scz= zr= Azr rVz= uzAr zoY Y&zo z",
+"oJ Yczo z7Y Y:zo 7Jzo Ycz7 SozY zoYS& ]zo zo]c zrY rYz: ]zr ]zur zx zx- zxJ",
+" izx zx7 Azx xJz7 izAx zxS x-zS ]zx iz]x zxr zxAr zx]r |                   ",
+NULL
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the data for MSOPs of 4-variable functions.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ReadMsops( char ** ppSopSizes, char *** ppSops )
+{
+    unsigned uMasks[4][2] = {
+        { 0x5555, 0xAAAA },
+        { 0x3333, 0xCCCC },
+        { 0x0F0F, 0xF0F0 },
+        { 0x00FF, 0xFF00 }
+    };
+    char Map[256], * pPrev, * pMemory;
+    char * pSopSizes, ** pSops;
+    int i, k, b, Size;
+
+    // map chars into their numbers
+    for ( i = 0; i < 256; i++ )
+        Map[i] = -1;
+    for ( i = 0; i < 81; i++ )
+        Map[s_Data3[i]] = i;
+
+    // count the number of strings
+    for ( Size = 0; s_Data4[Size] && Size < 100000; Size++ );
+    assert( Size < 100000 );
+
+    // allocate memory
+    pMemory = ALLOC( char, Size * 75 );
+    // copy the array into memory
+    for ( i = 0; i < Size; i++ )
+        for ( k = 0; k < 75; k++ )
+            if ( s_Data4[i][k] == ' ' )
+                pMemory[i*75+k] = -1;
+            else
+                pMemory[i*75+k] = Map[s_Data4[i][k]];
+
+    // set pointers and compute SOP sizes
+    pSopSizes = ALLOC( char, 65536 );
+    pSops = ALLOC( char *, 65536 );
+    pSopSizes[0] = 0;
+    pSops[0] = NULL;
+    pPrev = pMemory;
+    for ( k = 0, i = 1; i < 65536; k++ )
+        if ( pMemory[k] == -1 )
+        {
+            pSopSizes[i] = pMemory + k - pPrev; 
+            pSops[i++] = pPrev;
+            pPrev = pMemory + k + 1;
+        }
+    *ppSopSizes = pSopSizes;
+    *ppSops = pSops;
+
+    // verify the results - derive truth table from SOP
+    for ( i = 1; i < 65536; i++ )
+    {
+        int uTruth = 0, uCube, Lit;
+        for ( k = 0; k < pSopSizes[i]; k++ )
+        {
+            uCube = 0xFFFF;
+            Lit = pSops[i][k];
+            for ( b = 3; b >= 0; b-- )
+            {
+                if ( Lit % 3 == 0 )
+                    uCube &= uMasks[b][0];
+                else if ( Lit % 3 == 1 )
+                    uCube &= uMasks[b][1];
+                Lit = Lit / 3;
+            }
+            uTruth |= uCube;
+        }
+        assert( uTruth == i );
+    }
+}
+
+#if 0
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManDeriveCnfTest()
+{
+    int i, k, Lit;
+    printf( "\n" );
+    for ( i = 80; i >= 0; i-- )
+    {
+        Lit = i;
+        for ( k = 0; k < 4; k++ )
+        {
+            if ( Lit % 3 == 0 )
+                printf( "%c", 'A' + k );
+            else if ( Lit % 3 == 1 )
+                printf( "%c", 'a' + k );
+            Lit = Lit / 3;
+        }
+        printf( "\n" );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManDeriveCnfTest2()
+{
+    char s_Data3[81] = "!#&()*+,-.0123456789:;<=>?ABCDEFGHIJKLMNOPQRSTUVWXYZ[]abcdefghijklmnopqrstuvwxyz|";
+
+    unsigned uMasks[4][2] = {
+        { 0x5555, 0xAAAA },
+        { 0x3333, 0xCCCC },
+        { 0x0F0F, 0xF0F0 },
+        { 0x00FF, 0xFF00 }
+    };
+    char Buffer[100], * pCur;
+    FILE * pFile;
+    int CountCur, Counter = 0, nLines = 0;
+    int pLines[1<<16] = {0};
+    int pNums[1<<16] = {0};
+    unsigned uTruth, uTruth2, uCube, cCube;
+    char * pSops[1<<16] = {0};
+    char Sop[10];
+    char Cube[4];
+    int i, k;
+
+    pFile = fopen( "cands2.txt", "r" );
+    while ( fgets( Buffer, 100, pFile ) )
+    {
+        if ( Buffer[0] == '0' )
+            Extra_ReadHexadecimal( &uTruth2, Buffer+2, 4 );
+        else
+            uTruth2 = 0xFFFFFF;
+
+        // skip all chars till a-d or A-D
+        if ( Buffer[0] == '0' )
+        for ( pCur = Buffer; *pCur != '\n'; pCur++ )
+        {
+//            if ( *pCur >= 'a' && *pCur <= 'd' || *pCur >= 'A' && *pCur <= 'D' )
+            if ( *pCur == ':' )
+            {
+                pCur++;
+                break;
+            }
+        }
+        else
+            pCur = Buffer;
+
+
+        uTruth = 0;
+        CountCur = 0;
+        uCube = 0xFFFF;
+        for ( i = 0; i < 4; i++ )
+            Cube[i] = 2;
+
+        for ( ; *pCur; pCur++ )
+        {
+            if ( *pCur == '+' || *pCur == '\n' )
+            {
+                uTruth |= uCube;
+                uCube = 0xFFFF;
+
+                // get the cube
+                cCube = 0;
+                for ( i = 0; i < 4; i++ )
+                    cCube = 3 * cCube + Cube[i];
+                for ( i = 0; i < 4; i++ )
+                    Cube[i] = 2;
+
+                assert( cCube >= 0 && cCube < 81 );
+                Sop[CountCur] = cCube;
+                CountCur++;
+                if ( *pCur == '\n' )
+                {
+                    Sop[CountCur] = 0;
+                    break;
+                }
+            }
+            else if ( *pCur >= 'a' && *pCur <= 'd' )
+            {
+                uCube &= uMasks[*pCur-'a'][1];
+                Cube[*pCur-'a'] = 1;
+            }
+            else if ( *pCur >= 'A' && *pCur <= 'D' )
+            {
+                uCube &= uMasks[*pCur-'A'][0];
+                Cube[*pCur-'A'] = 0;
+            }
+        }
+        assert( *pCur == '\n' );
+        assert( uTruth2 == 0xFFFFFF || uTruth2 == uTruth );
+
+        Counter += CountCur;
+        pNums[uTruth] = CountCur;
+        pSops[uTruth] = ALLOC( char, CountCur );
+        memcpy( pSops[uTruth], Sop, CountCur );
+        pLines[nLines++] = Counter;
+    }
+    fclose( pFile );
+
+    printf( "Lines = %d. Counter = %d.\n", nLines, Counter );
+
+/*
+    // write the number of cubes
+    for ( i = 0; i < 65536; i++ )
+        printf( "%d,%d ", pNums[i], pNums[i] + pNums[0xffff & ~i] );
+    printf( "\n" );
+*/
+
+    // write the number of cubes
+    Counter = 0;
+    for ( i = 1; i < 65536; i++ )
+    {
+        CountCur = pNums[i];
+        assert( CountCur > 0 );
+        for ( k = 0; k <= CountCur; k++ )
+        {
+            if ( k < CountCur )
+            {
+                assert( pSops[i][k] >= 0 && pSops[i][k] < 81 );
+                printf( "%c", s_Data3[pSops[i][k]] );
+            }
+            else 
+                printf( " " );
+            if ( ++Counter == 75 )
+            {
+                printf( "\",\n\"" );
+                Counter = 0;
+            }
+        }
+    }
+    printf( "\n" );
+
+    return 1;
+}
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfMan.c b/abc70930/src/aig/cnf/cnfMan.c
new file mode 100644
index 00000000..1edc012a
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfMan.c
@@ -0,0 +1,202 @@
+/**CFile****************************************************************
+
+  FileName    [cnfMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfMan.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+#include "satSolver.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline int Cnf_Lit2Var( int Lit )        { return (Lit & 1)? -(Lit >> 1)-1 : (Lit >> 1)+1;  }
+static inline int Cnf_Lit2Var2( int Lit )       { return (Lit & 1)? -(Lit >> 1)   : (Lit >> 1);    }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Man_t * Cnf_ManStart()
+{
+    Cnf_Man_t * p;
+    int i;
+    // allocate the manager
+    p = ALLOC( Cnf_Man_t, 1 );
+    memset( p, 0, sizeof(Cnf_Man_t) );
+    // derive internal data structures
+    Cnf_ReadMsops( &p->pSopSizes, &p->pSops );
+    // allocate memory manager for cuts
+    p->pMemCuts = Aig_MmFlexStart();
+    p->nMergeLimit = 10;
+    // allocate temporary truth tables
+    p->pTruths[0] = ALLOC( unsigned, 4 * Aig_TruthWordNum(p->nMergeLimit) );
+    for ( i = 1; i < 4; i++ )
+        p->pTruths[i] = p->pTruths[i-1] + Aig_TruthWordNum(p->nMergeLimit);
+    p->vMemory = Vec_IntAlloc( 1 << 18 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ManStop( Cnf_Man_t * p )
+{
+    Vec_IntFree( p->vMemory );
+    free( p->pTruths[0] );
+    Aig_MmFlexStop( p->pMemCuts, 0 );
+    free( p->pSopSizes );
+    free( p->pSops[1] );
+    free( p->pSops );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the array of CI IDs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Cnf_DataCollectPiSatNums( Cnf_Dat_t * pCnf, Aig_Man_t * p )
+{
+    Vec_Int_t * vCiIds;
+    Aig_Obj_t * pObj;
+    int i;
+    vCiIds = Vec_IntAlloc( Aig_ManPiNum(p) );
+    Aig_ManForEachPi( p, pObj, i )
+        Vec_IntPush( vCiIds, pCnf->pVarNums[pObj->Id] );
+    return vCiIds;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_DataFree( Cnf_Dat_t * p )
+{
+    if ( p == NULL )
+        return;
+    free( p->pClauses[0] );
+    free( p->pClauses );
+    free( p->pVarNums );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes CNF into a file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_DataWriteIntoFile( Cnf_Dat_t * p, char * pFileName, int fReadable )
+{
+    FILE * pFile;
+    int * pLit, * pStop, i;
+    pFile = fopen( pFileName, "w" );
+    if ( pFile == NULL )
+    {
+        printf( "Cnf_WriteIntoFile(): Output file cannot be opened.\n" );
+        return;
+    }
+    fprintf( pFile, "c Result of efficient AIG-to-CNF conversion using package CNF\n" );
+    fprintf( pFile, "p %d %d\n", p->nVars, p->nClauses );
+    for ( i = 0; i < p->nClauses; i++ )
+    {
+        for ( pLit = p->pClauses[i], pStop = p->pClauses[i+1]; pLit < pStop; pLit++ )
+            fprintf( pFile, "%d ", fReadable? Cnf_Lit2Var2(*pLit) : Cnf_Lit2Var(*pLit) );
+        fprintf( pFile, "0\n" );
+    }
+    fprintf( pFile, "\n" );
+    fclose( pFile );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes CNF into a file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void * Cnf_DataWriteIntoSolver( Cnf_Dat_t * p )
+{
+    sat_solver * pSat;
+    int i, status;
+    pSat = sat_solver_new();
+    sat_solver_setnvars( pSat, p->nVars );
+    for ( i = 0; i < p->nClauses; i++ )
+    {
+        if ( !sat_solver_addclause( pSat, p->pClauses[i], p->pClauses[i+1] ) )
+        {
+            sat_solver_delete( pSat );
+            return NULL;
+        }
+    }
+    status = sat_solver_simplify(pSat);
+    if ( status == 0 )
+    {
+        sat_solver_delete( pSat );
+        return NULL;
+    }
+    return pSat;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfMap.c b/abc70930/src/aig/cnf/cnfMap.c
new file mode 100644
index 00000000..d966df15
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfMap.c
@@ -0,0 +1,356 @@
+/**CFile****************************************************************
+
+  FileName    [cnfMap.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfMap.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area flow of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutAssignAreaFlow( Cnf_Man_t * p, Dar_Cut_t * pCut, int * pAreaFlows )
+{
+    Aig_Obj_t * pLeaf;
+    int i;
+    pCut->Value = 0;
+    pCut->uSign = 100 * Cnf_CutSopCost( p, pCut );
+    Dar_CutForEachLeaf( p->pManAig, pCut, pLeaf, i )
+    {
+        pCut->Value += pLeaf->nRefs;
+        if ( !Aig_ObjIsNode(pLeaf) )
+            continue;
+        assert( pLeaf->nRefs > 0 );
+        pCut->uSign += pAreaFlows[pLeaf->Id] / (pLeaf->nRefs? pLeaf->nRefs : 1);
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area flow of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_CutSuperAreaFlow( Vec_Ptr_t * vSuper, int * pAreaFlows )
+{
+    Aig_Obj_t * pLeaf;
+    int i, nAreaFlow;
+    nAreaFlow = 100 * (Vec_PtrSize(vSuper) + 1);
+    Vec_PtrForEachEntry( vSuper, pLeaf, i )
+    {
+        pLeaf = Aig_Regular(pLeaf);
+        if ( !Aig_ObjIsNode(pLeaf) )
+            continue;
+        assert( pLeaf->nRefs > 0 );
+        nAreaFlow += pAreaFlows[pLeaf->Id] / (pLeaf->nRefs? pLeaf->nRefs : 1);
+    }
+    return nAreaFlow;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_DeriveMapping( Cnf_Man_t * p )
+{
+    Vec_Ptr_t * vSuper;
+    Aig_Obj_t * pObj;
+    Dar_Cut_t * pCut, * pCutBest;
+    int i, k, AreaFlow, * pAreaFlows;
+    // allocate area flows
+    pAreaFlows = ALLOC( int, Aig_ManObjNumMax(p->pManAig) );
+    memset( pAreaFlows, 0, sizeof(int) * Aig_ManObjNumMax(p->pManAig) );
+    // visit the nodes in the topological order and update their best cuts
+    vSuper = Vec_PtrAlloc( 100 );
+    Aig_ManForEachNode( p->pManAig, pObj, i )
+    {
+        // go through the cuts
+        pCutBest = NULL;
+        Dar_ObjForEachCut( pObj, pCut, k )
+        {
+            pCut->fBest = 0;
+            if ( k == 0 )
+                continue;
+            Cnf_CutAssignAreaFlow( p, pCut, pAreaFlows );
+            if ( pCutBest == NULL || pCutBest->uSign > pCut->uSign || 
+                (pCutBest->uSign == pCut->uSign && pCutBest->Value < pCut->Value) )
+                 pCutBest = pCut;
+        }
+        // check the big cut
+//        Aig_ObjCollectSuper( pObj, vSuper );
+        // get the area flow of this cut
+//        AreaFlow = Cnf_CutSuperAreaFlow( vSuper, pAreaFlows );
+        AreaFlow = AIG_INFINITY;
+        if ( AreaFlow >= (int)pCutBest->uSign )
+        {
+            pAreaFlows[pObj->Id] = pCutBest->uSign;
+            pCutBest->fBest = 1;
+        }
+        else
+        {
+            pAreaFlows[pObj->Id] = AreaFlow;
+            pObj->fMarkB = 1; // mark the special node
+        }
+    }
+    Vec_PtrFree( vSuper );
+    free( pAreaFlows );
+
+/*
+    // compute the area of mapping
+    AreaFlow = 0;
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+        AreaFlow += Dar_ObjBestCut(Aig_ObjFanin0(pObj))->uSign / 100 / Aig_ObjFanin0(pObj)->nRefs;
+    printf( "Area of the network = %d.\n", AreaFlow );
+*/
+}
+
+
+
+#if 0
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area of the first level.]
+
+  Description [The cut need to be derefed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+ 
+***********************************************************************/
+void Aig_CutDeref( Aig_Man_t * p, Dar_Cut_t * pCut )
+{ 
+    Aig_Obj_t * pLeaf;
+    int i;
+    Dar_CutForEachLeaf( p, pCut, pLeaf, i )
+    {
+        assert( pLeaf->nRefs > 0 );
+        if ( --pLeaf->nRefs > 0 || !Aig_ObjIsAnd(pLeaf) )
+            continue;
+        Aig_CutDeref( p, Aig_ObjBestCut(pLeaf) );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area of the first level.]
+
+  Description [The cut need to be derefed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_CutRef( Aig_Man_t * p, Dar_Cut_t * pCut )
+{
+    Aig_Obj_t * pLeaf;
+    int i, Area = pCut->Value;
+    Dar_CutForEachLeaf( p, pCut, pLeaf, i )
+    {
+        assert( pLeaf->nRefs >= 0 );
+        if ( pLeaf->nRefs++ > 0 || !Aig_ObjIsAnd(pLeaf) )
+            continue;
+        Area += Aig_CutRef( p, Aig_ObjBestCut(pLeaf) );
+    }
+    return Area;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes exact area of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_CutArea( Aig_Man_t * p, Dar_Cut_t * pCut )
+{
+    int Area;
+    Area = Aig_CutRef( p, pCut );
+    Aig_CutDeref( p, pCut );
+    return Area;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the second cut is better.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Cnf_CutCompare( Dar_Cut_t * pC0, Dar_Cut_t * pC1 )
+{
+    if ( pC0->Area < pC1->Area - 0.0001 )
+        return -1;
+    if ( pC0->Area > pC1->Area + 0.0001 ) // smaller area flow is better
+        return 1;
+//    if ( pC0->NoRefs < pC1->NoRefs )
+//        return -1;
+//    if ( pC0->NoRefs > pC1->NoRefs ) // fewer non-referenced fanins is better
+//        return 1;
+//    if ( pC0->FanRefs / pC0->nLeaves > pC1->FanRefs / pC1->nLeaves )
+//        return -1;
+//    if ( pC0->FanRefs / pC0->nLeaves < pC1->FanRefs / pC1->nLeaves )
+//        return 1; // larger average fanin ref-counter is better
+//    return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the cut with the smallest area flow.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Cut_t * Cnf_ObjFindBestCut( Aig_Obj_t * pObj )
+{
+    Dar_Cut_t * pCut, * pCutBest;
+    int i;
+    pCutBest = NULL;
+    Dar_ObjForEachCut( pObj, pCut, i )
+        if ( pCutBest == NULL || Cnf_CutCompare(pCutBest, pCut) == 1 )
+            pCutBest = pCut;
+    return pCutBest;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area flow of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_CutAssignArea( Cnf_Man_t * p, Dar_Cut_t * pCut )
+{
+    Aig_Obj_t * pLeaf;
+    int i;
+    pCut->Area    = (float)pCut->Cost;
+    pCut->NoRefs  = 0;
+    pCut->FanRefs = 0;
+    Dar_CutForEachLeaf( p->pManAig, pCut, pLeaf, i )
+    {
+        if ( !Aig_ObjIsNode(pLeaf) )
+            continue;
+        if ( pLeaf->nRefs == 0 )
+        {
+            pCut->Area += Aig_ObjBestCut(pLeaf)->Cost;
+            pCut->NoRefs++;
+        }
+        else
+        {
+            if ( pCut->FanRefs + pLeaf->nRefs > 15 )
+                pCut->FanRefs = 15;
+            else
+                pCut->FanRefs += pLeaf->nRefs;
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs one round of "area recovery" using exact local area.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_ManMapForCnf( Cnf_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    Dar_Cut_t * pCut, * pCutBest;
+    int i, k;
+    // visit the nodes in the topological order and update their best cuts
+    Aig_ManForEachNode( p->pManAig, pObj, i )
+    {
+        // find the old best cut
+        pCutBest = Aig_ObjBestCut(pObj);
+        Dar_ObjClearBestCut(pCutBest);
+        // if the node is used, dereference its cut
+        if ( pObj->nRefs )
+            Aig_CutDeref( p->pManAig, pCutBest );
+
+        // evaluate the cuts of this node
+        Dar_ObjForEachCut( pObj, pCut, k )
+//            Cnf_CutAssignAreaFlow( p, pCut );
+            pCut->Area = (float)Cnf_CutArea( p->pManAig, pCut );
+
+        // find the new best cut
+        pCutBest = Cnf_ObjFindBestCut(pObj);
+        Dar_ObjSetBestCut( pCutBest );
+        // if the node is used, reference its cut
+        if ( pObj->nRefs )
+            Aig_CutRef( p->pManAig, pCutBest );
+    }
+    return 1;
+}
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfPost.c b/abc70930/src/aig/cnf/cnfPost.c
new file mode 100644
index 00000000..988275b2
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfPost.c
@@ -0,0 +1,233 @@
+/**CFile****************************************************************
+
+  FileName    [cnfPost.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfPost.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ManPostprocess_old( Cnf_Man_t * p )
+{
+//    extern int Aig_ManLargeCutEval( Aig_Man_t * p, Aig_Obj_t * pRoot, Dar_Cut_t * pCutR, Dar_Cut_t * pCutL, int Leaf );
+    int nNew, Gain, nGain = 0, nVars = 0;
+
+    Aig_Obj_t * pObj, * pFan;
+    Dar_Cut_t * pCutBest, * pCut;
+    int i, k;//, a, b, Counter;
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+    {
+        if ( !Aig_ObjIsNode(pObj) )
+            continue;
+        if ( pObj->nRefs == 0 )
+            continue;
+//        pCutBest = Aig_ObjBestCut(pObj);
+        pCutBest = NULL;
+
+        Dar_CutForEachLeaf( p->pManAig, pCutBest, pFan, k )
+        {
+            if ( !Aig_ObjIsNode(pFan) )
+                continue;
+            assert( pFan->nRefs != 0 );
+            if ( pFan->nRefs != 1 )
+                continue;
+//            pCut = Aig_ObjBestCut(pFan);
+            pCut = NULL;
+/*
+            // find how many common variable they have
+            Counter = 0;
+            for ( a = 0; a < (int)pCut->nLeaves; a++ )
+            {
+                for ( b = 0; b < (int)pCutBest->nLeaves; b++ )
+                    if ( pCut->pLeaves[a] == pCutBest->pLeaves[b] )
+                        break;
+                if ( b == (int)pCutBest->nLeaves )
+                    continue;
+                Counter++;
+            }
+            printf( "%d ", Counter );
+*/
+            // find the new truth table after collapsing these two cuts
+
+
+//            nNew = Aig_ManLargeCutEval( p->pManAig, pObj, pCutBest, pCut, pFan->Id );
+            nNew = 0;
+
+
+//            printf( "%d+%d=%d:%d(%d) ", pCutBest->Cost, pCut->Cost, 
+//                pCutBest->Cost+pCut->Cost, nNew, pCutBest->Cost+pCut->Cost-nNew );
+
+            Gain = pCutBest->Value + pCut->Value - nNew;
+            if ( Gain > 0 )
+            {
+                nGain += Gain;
+                nVars++;
+            }
+        }
+    }
+    printf( "Total gain = %d.  Vars = %d.\n", nGain, nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers cuts of the mapped nodes into internal representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ManTransferCuts( Cnf_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_MmFlexRestart( p->pMemCuts );
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+    {
+        if ( Aig_ObjIsNode(pObj) && pObj->nRefs > 0 )
+            pObj->pData = Cnf_CutCreate( p, pObj );
+        else
+            pObj->pData = NULL;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers cuts of the mapped nodes into internal representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ManFreeCuts( Cnf_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        if ( pObj->pData )
+        {
+            Cnf_CutFree( pObj->pData );
+            pObj->pData = NULL;
+        }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_ManPostprocess( Cnf_Man_t * p )
+{
+    Cnf_Cut_t * pCut, * pCutFan, * pCutRes;
+    Aig_Obj_t * pObj, * pFan;
+    int Order[16], Costs[16];
+    int i, k, fChanges;
+    Aig_ManForEachNode( p->pManAig, pObj, i )
+    {
+        if ( pObj->nRefs == 0 )
+            continue;
+        pCut = Cnf_ObjBestCut(pObj);
+
+        // sort fanins according to their size
+        Cnf_CutForEachLeaf( p->pManAig, pCut, pFan, k )
+        {
+            Order[k] = k;
+            Costs[k] = Aig_ObjIsNode(pFan)? Cnf_ObjBestCut(pFan)->Cost : 0;
+        }
+        // sort the cuts by Weight
+        do {
+            int Temp;
+            fChanges = 0;
+            for ( k = 0; k < pCut->nFanins - 1; k++ )
+            {
+                if ( Costs[Order[k]] <= Costs[Order[k+1]] )
+                    continue;
+                Temp = Order[k];
+                Order[k] = Order[k+1];
+                Order[k+1] = Temp;
+                fChanges = 1;
+            }
+        } while ( fChanges );
+
+
+//        Cnf_CutForEachLeaf( p->pManAig, pCut, pFan, k )
+        for ( k = 0; (k < (int)(pCut)->nFanins) && ((pFan) = Aig_ManObj(p->pManAig, (pCut)->pFanins[Order[k]])); k++ )
+        {
+            if ( !Aig_ObjIsNode(pFan) )
+                continue;
+            assert( pFan->nRefs != 0 );
+            if ( pFan->nRefs != 1 )
+                continue;
+            pCutFan = Cnf_ObjBestCut(pFan);
+            // try composing these two cuts
+//            Cnf_CutPrint( pCut );
+            pCutRes = Cnf_CutCompose( p, pCut, pCutFan, pFan->Id );
+//            Cnf_CutPrint( pCut );
+//            printf( "\n" );
+            // check if the cost if reduced
+            if ( pCutRes == NULL || pCutRes->Cost == 127 || pCutRes->Cost > pCut->Cost + pCutFan->Cost )
+            {
+                if ( pCutRes )
+                    Cnf_CutFree( pCutRes );
+                continue;
+            }
+            // update the cut
+            Cnf_ObjSetBestCut( pObj, pCutRes );
+            Cnf_ObjSetBestCut( pFan, NULL );
+            Cnf_CutUpdateRefs( p, pCut, pCutFan, pCutRes );
+            assert( pFan->nRefs == 0 );
+            Cnf_CutFree( pCut );
+            Cnf_CutFree( pCutFan );
+            break;
+        }
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfUtil.c b/abc70930/src/aig/cnf/cnfUtil.c
new file mode 100644
index 00000000..cd47cb58
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfUtil.c
@@ -0,0 +1,188 @@
+/**CFile****************************************************************
+
+  FileName    [cnfUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfUtil.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped )
+{
+    Aig_Obj_t * pLeaf;
+    Dar_Cut_t * pCutBest;
+    int aArea, i;
+    if ( pObj->nRefs++ || Aig_ObjIsPi(pObj) || Aig_ObjIsConst1(pObj) )
+        return 0;
+    assert( Aig_ObjIsAnd(pObj) );
+    // collect the node first to derive pre-order
+    if ( vMapped )
+        Vec_PtrPush( vMapped, pObj );
+    // visit the transitive fanin of the selected cut
+    if ( pObj->fMarkB )
+    {
+        Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
+        Aig_ObjCollectSuper( pObj, vSuper );
+        aArea = Vec_PtrSize(vSuper) + 1;
+        Vec_PtrForEachEntry( vSuper, pLeaf, i )
+            aArea += Aig_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped );
+        Vec_PtrFree( vSuper );
+        ////////////////////////////
+        pObj->fMarkB = 1;
+    }
+    else
+    {
+        pCutBest = Dar_ObjBestCut( pObj );
+        aArea = Cnf_CutSopCost( p, pCutBest );
+        Dar_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
+            aArea += Aig_ManScanMapping_rec( p, pLeaf, vMapped );
+    }
+    return aArea;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description [Collects the nodes in reverse topological order.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Aig_ManScanMapping( Cnf_Man_t * p, int fCollect )
+{
+    Vec_Ptr_t * vMapped = NULL;
+    Aig_Obj_t * pObj;
+    int i;
+    // clean all references
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        pObj->nRefs = 0;
+    // allocate the array
+    if ( fCollect )
+        vMapped = Vec_PtrAlloc( 1000 );
+    // collect nodes reachable from POs in the DFS order through the best cuts
+    p->aArea = 0;
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+        p->aArea += Aig_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped );
+//    printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManPiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
+    return vMapped;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_ManScanMapping_rec( Cnf_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vMapped, int fPreorder )
+{
+    Aig_Obj_t * pLeaf;
+    Cnf_Cut_t * pCutBest;
+    int aArea, i;
+    if ( pObj->nRefs++ || Aig_ObjIsPi(pObj) || Aig_ObjIsConst1(pObj) )
+        return 0;
+    assert( Aig_ObjIsAnd(pObj) );
+    assert( pObj->pData != NULL );
+    // add the node to the mapping
+    if ( vMapped && fPreorder )
+         Vec_PtrPush( vMapped, pObj );
+    // visit the transitive fanin of the selected cut
+    if ( pObj->fMarkB )
+    {
+        Vec_Ptr_t * vSuper = Vec_PtrAlloc( 100 );
+        Aig_ObjCollectSuper( pObj, vSuper );
+        aArea = Vec_PtrSize(vSuper) + 1;
+        Vec_PtrForEachEntry( vSuper, pLeaf, i )
+            aArea += Cnf_ManScanMapping_rec( p, Aig_Regular(pLeaf), vMapped, fPreorder );
+        Vec_PtrFree( vSuper );
+        ////////////////////////////
+        pObj->fMarkB = 1;
+    }
+    else
+    {
+        pCutBest = pObj->pData;
+        assert( pCutBest->Cost < 127 );
+        aArea = pCutBest->Cost;
+        Cnf_CutForEachLeaf( p->pManAig, pCutBest, pLeaf, i )
+            aArea += Cnf_ManScanMapping_rec( p, pLeaf, vMapped, fPreorder );
+    }
+    // add the node to the mapping
+    if ( vMapped && !fPreorder )
+         Vec_PtrPush( vMapped, pObj );
+    return aArea;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area, references, and nodes used in the mapping.]
+
+  Description [Collects the nodes in reverse topological order.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Cnf_ManScanMapping( Cnf_Man_t * p, int fCollect, int fPreorder )
+{
+    Vec_Ptr_t * vMapped = NULL;
+    Aig_Obj_t * pObj;
+    int i;
+    // clean all references
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        pObj->nRefs = 0;
+    // allocate the array
+    if ( fCollect )
+        vMapped = Vec_PtrAlloc( 1000 );
+    // collect nodes reachable from POs in the DFS order through the best cuts
+    p->aArea = 0;
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+        p->aArea += Cnf_ManScanMapping_rec( p, Aig_ObjFanin0(pObj), vMapped, fPreorder );
+//    printf( "Variables = %6d. Clauses = %8d.\n", vMapped? Vec_PtrSize(vMapped) + Aig_ManPiNum(p->pManAig) + 1 : 0, p->aArea + 2 );
+    return vMapped;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnfWrite.c b/abc70930/src/aig/cnf/cnfWrite.c
new file mode 100644
index 00000000..45a3efad
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnfWrite.c
@@ -0,0 +1,443 @@
+/**CFile****************************************************************
+
+  FileName    [cnfWrite.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnfWrite.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the cover into the array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cnf_SopConvertToVector( char * pSop, int nCubes, Vec_Int_t * vCover )
+{
+    int Lits[4], Cube, iCube, i, b;
+    Vec_IntClear( vCover );
+    for ( i = 0; i < nCubes; i++ )
+    {
+        Cube = pSop[i];
+        for ( b = 0; b < 4; b++ )
+        {
+            if ( Cube % 3 == 0 )
+                Lits[b] = 1;
+            else if ( Cube % 3 == 1 )
+                Lits[b] = 2;
+            else
+                Lits[b] = 0;
+            Cube = Cube / 3;
+        }
+        iCube = 0;
+        for ( b = 0; b < 4; b++ )
+            iCube = (iCube << 2) | Lits[b];
+        Vec_IntPush( vCover, iCube );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of literals in the SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_SopCountLiterals( char * pSop, int nCubes )
+{
+    int nLits = 0, Cube, i, b;
+    for ( i = 0; i < nCubes; i++ )
+    {
+        Cube = pSop[i];
+        for ( b = 0; b < 4; b++ )
+        {
+            if ( Cube % 3 != 2 )
+                nLits++;
+            Cube = Cube / 3;
+        }
+    }
+    return nLits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of literals in the SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_IsopCountLiterals( Vec_Int_t * vIsop, int nVars )
+{
+    int nLits = 0, Cube, i, b;
+    Vec_IntForEachEntry( vIsop, Cube, i )
+    {
+        for ( b = 0; b < nVars; b++ )
+        {
+            if ( (Cube & 3) == 1 || (Cube & 3) == 2 )
+                nLits++;
+            Cube >>= 2;
+        }
+    }
+    return nLits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the cube and returns the number of literals in it.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Cnf_IsopWriteCube( int Cube, int nVars, int * pVars, int * pLiterals )
+{
+    int nLits = nVars, b;
+    for ( b = 0; b < nVars; b++ )
+    {
+        if ( (Cube & 3) == 1 ) // value 0 --> write positive literal
+            *pLiterals++ = 2 * pVars[b];
+        else if ( (Cube & 3) == 2 ) // value 1 --> write negative literal
+            *pLiterals++ = 2 * pVars[b] + 1;
+        else
+            nLits--;
+        Cube >>= 2;
+    }
+    return nLits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives CNF for the mapping.]
+
+  Description [The last argument shows the number of last outputs
+  of the manager, which will not be converted into clauses but the
+  new variables for which will be introduced.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Dat_t * Cnf_ManWriteCnf( Cnf_Man_t * p, Vec_Ptr_t * vMapped, int nOutputs )
+{
+    Aig_Obj_t * pObj;
+    Cnf_Dat_t * pCnf;
+    Cnf_Cut_t * pCut;
+    Vec_Int_t * vCover, * vSopTemp;
+    int OutVar, PoVar, pVars[32], * pLits, ** pClas;
+    unsigned uTruth;
+    int i, k, nLiterals, nClauses, Cube, Number;
+
+    // count the number of literals and clauses
+    nLiterals = 1 + Aig_ManPoNum( p->pManAig ) + 3 * nOutputs;
+    nClauses = 1 + Aig_ManPoNum( p->pManAig ) + nOutputs;
+    Vec_PtrForEachEntry( vMapped, pObj, i )
+    {
+        assert( Aig_ObjIsNode(pObj) );
+        pCut = Cnf_ObjBestCut( pObj );
+
+        // positive polarity of the cut
+        if ( pCut->nFanins < 5 )
+        {
+            uTruth = 0xFFFF & *Cnf_CutTruth(pCut);
+            nLiterals += Cnf_SopCountLiterals( p->pSops[uTruth], p->pSopSizes[uTruth] ) + p->pSopSizes[uTruth];
+            assert( p->pSopSizes[uTruth] >= 0 );
+            nClauses += p->pSopSizes[uTruth];
+        }
+        else
+        {
+            nLiterals += Cnf_IsopCountLiterals( pCut->vIsop[1], pCut->nFanins ) + Vec_IntSize(pCut->vIsop[1]);
+            nClauses += Vec_IntSize(pCut->vIsop[1]);
+        }
+        // negative polarity of the cut
+        if ( pCut->nFanins < 5 )
+        {
+            uTruth = 0xFFFF & ~*Cnf_CutTruth(pCut);
+            nLiterals += Cnf_SopCountLiterals( p->pSops[uTruth], p->pSopSizes[uTruth] ) + p->pSopSizes[uTruth];
+            assert( p->pSopSizes[uTruth] >= 0 );
+            nClauses += p->pSopSizes[uTruth];
+        }
+        else
+        {
+            nLiterals += Cnf_IsopCountLiterals( pCut->vIsop[0], pCut->nFanins ) + Vec_IntSize(pCut->vIsop[0]);
+            nClauses += Vec_IntSize(pCut->vIsop[0]);
+        }
+//printf( "%d ", nClauses-(1 + Aig_ManPoNum( p->pManAig )) );
+    }
+//printf( "\n" );
+
+    // allocate CNF
+    pCnf = ALLOC( Cnf_Dat_t, 1 );
+    memset( pCnf, 0, sizeof(Cnf_Dat_t) );
+    pCnf->nLiterals = nLiterals;
+    pCnf->nClauses = nClauses;
+    pCnf->pClauses = ALLOC( int *, nClauses + 1 );
+    pCnf->pClauses[0] = ALLOC( int, nLiterals );
+    pCnf->pClauses[nClauses] = pCnf->pClauses[0] + nLiterals;
+
+    // create room for variable numbers
+    pCnf->pVarNums = ALLOC( int, Aig_ManObjNumMax(p->pManAig) );
+    memset( pCnf->pVarNums, 0xff, sizeof(int) * Aig_ManObjNumMax(p->pManAig) );
+    // assign variables to the last (nOutputs) POs
+    Number = 1;
+    if ( nOutputs )
+    {
+        assert( nOutputs == Aig_ManRegNum(p->pManAig) );
+        Aig_ManForEachLiSeq( p->pManAig, pObj, i )
+            pCnf->pVarNums[pObj->Id] = Number++;
+    }
+    // assign variables to the internal nodes
+    Vec_PtrForEachEntry( vMapped, pObj, i )
+        pCnf->pVarNums[pObj->Id] = Number++;
+    // assign variables to the PIs and constant node
+    Aig_ManForEachPi( p->pManAig, pObj, i )
+        pCnf->pVarNums[pObj->Id] = Number++;
+    pCnf->pVarNums[Aig_ManConst1(p->pManAig)->Id] = Number++;
+    pCnf->nVars = Number;
+
+    // assign the clauses
+    vSopTemp = Vec_IntAlloc( 1 << 16 );
+    pLits = pCnf->pClauses[0];
+    pClas = pCnf->pClauses;
+    Vec_PtrForEachEntry( vMapped, pObj, i )
+    {
+        pCut = Cnf_ObjBestCut( pObj );
+
+        // save variables of this cut
+        OutVar = pCnf->pVarNums[ pObj->Id ];
+        for ( k = 0; k < (int)pCut->nFanins; k++ )
+        {
+            pVars[k] = pCnf->pVarNums[ pCut->pFanins[k] ];
+            assert( pVars[k] <= Aig_ManObjNumMax(p->pManAig) );
+        }
+
+        // positive polarity of the cut
+        if ( pCut->nFanins < 5 )
+        {
+            uTruth = 0xFFFF & *Cnf_CutTruth(pCut);
+            Cnf_SopConvertToVector( p->pSops[uTruth], p->pSopSizes[uTruth], vSopTemp );
+            vCover = vSopTemp;
+        }
+        else
+            vCover = pCut->vIsop[1];
+        Vec_IntForEachEntry( vCover, Cube, k )
+        {
+            *pClas++ = pLits;
+            *pLits++ = 2 * OutVar; 
+            pLits += Cnf_IsopWriteCube( Cube, pCut->nFanins, pVars, pLits );
+        }
+
+        // negative polarity of the cut
+        if ( pCut->nFanins < 5 )
+        {
+            uTruth = 0xFFFF & ~*Cnf_CutTruth(pCut);
+            Cnf_SopConvertToVector( p->pSops[uTruth], p->pSopSizes[uTruth], vSopTemp );
+            vCover = vSopTemp;
+        }
+        else
+            vCover = pCut->vIsop[0];
+        Vec_IntForEachEntry( vCover, Cube, k )
+        {
+            *pClas++ = pLits;
+            *pLits++ = 2 * OutVar + 1; 
+            pLits += Cnf_IsopWriteCube( Cube, pCut->nFanins, pVars, pLits );
+        }
+    }
+    Vec_IntFree( vSopTemp );
+ 
+    // write the constant literal
+    OutVar = pCnf->pVarNums[ Aig_ManConst1(p->pManAig)->Id ];
+    assert( OutVar <= Aig_ManObjNumMax(p->pManAig) );
+    *pClas++ = pLits;
+    *pLits++ = 2 * OutVar; 
+
+    // write the output literals
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+    {
+        OutVar = pCnf->pVarNums[ Aig_ObjFanin0(pObj)->Id ];
+        if ( i < Aig_ManPoNum(p->pManAig) - nOutputs )
+        {
+            *pClas++ = pLits;
+            *pLits++ = 2 * OutVar + Aig_ObjFaninC0(pObj); 
+        }
+        else
+        {
+            PoVar = pCnf->pVarNums[ pObj->Id ];
+            // first clause
+            *pClas++ = pLits;
+            *pLits++ = 2 * PoVar; 
+            *pLits++ = 2 * OutVar + !Aig_ObjFaninC0(pObj); 
+            // second clause
+            *pClas++ = pLits;
+            *pLits++ = 2 * PoVar + 1; 
+            *pLits++ = 2 * OutVar + Aig_ObjFaninC0(pObj); 
+        }
+    }
+
+    // verify that the correct number of literals and clauses was written
+    assert( pLits - pCnf->pClauses[0] == nLiterals );
+    assert( pClas - pCnf->pClauses == nClauses );
+    return pCnf;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Derives a simple CNF for the AIG.]
+
+  Description [The last argument shows the number of last outputs
+  of the manager, which will not be converted into clauses but the
+  new variables for which will be introduced.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Cnf_Dat_t * Cnf_DeriveSimple( Aig_Man_t * p, int nOutputs )
+{
+    Aig_Obj_t * pObj;
+    Cnf_Dat_t * pCnf;
+    int OutVar, PoVar, pVars[32], * pLits, ** pClas;
+    int i, nLiterals, nClauses, Number;
+
+    // count the number of literals and clauses
+    nLiterals = 1 + 7 * Aig_ManNodeNum(p) + Aig_ManPoNum( p ) + 3 * nOutputs;
+    nClauses = 1 + 3 * Aig_ManNodeNum(p) + Aig_ManPoNum( p ) + nOutputs;
+
+    // allocate CNF
+    pCnf = ALLOC( Cnf_Dat_t, 1 );
+    memset( pCnf, 0, sizeof(Cnf_Dat_t) );
+    pCnf->nLiterals = nLiterals;
+    pCnf->nClauses = nClauses;
+    pCnf->pClauses = ALLOC( int *, nClauses + 1 );
+    pCnf->pClauses[0] = ALLOC( int, nLiterals );
+    pCnf->pClauses[nClauses] = pCnf->pClauses[0] + nLiterals;
+
+    // create room for variable numbers
+    pCnf->pVarNums = ALLOC( int, Aig_ManObjNumMax(p) );
+    memset( pCnf->pVarNums, 0xff, sizeof(int) * Aig_ManObjNumMax(p) );
+    // assign variables to the last (nOutputs) POs
+    Number = 1;
+    if ( nOutputs )
+    {
+        assert( nOutputs == Aig_ManRegNum(p) );
+        Aig_ManForEachLiSeq( p, pObj, i )
+            pCnf->pVarNums[pObj->Id] = Number++;
+    }
+    // assign variables to the internal nodes
+    Aig_ManForEachNode( p, pObj, i )
+        pCnf->pVarNums[pObj->Id] = Number++;
+    // assign variables to the PIs and constant node
+    Aig_ManForEachPi( p, pObj, i )
+        pCnf->pVarNums[pObj->Id] = Number++;
+    pCnf->pVarNums[Aig_ManConst1(p)->Id] = Number++;
+    pCnf->nVars = Number;
+/*
+    // print CNF numbers
+    printf( "SAT numbers of each node:\n" );
+    Aig_ManForEachObj( p, pObj, i )
+        printf( "%d=%d ", pObj->Id, pCnf->pVarNums[pObj->Id] );
+    printf( "\n" );
+*/
+    // assign the clauses
+    pLits = pCnf->pClauses[0];
+    pClas = pCnf->pClauses;
+    Aig_ManForEachNode( p, pObj, i )
+    {
+        OutVar   = pCnf->pVarNums[ pObj->Id ];
+        pVars[0] = pCnf->pVarNums[ Aig_ObjFanin0(pObj)->Id ];
+        pVars[1] = pCnf->pVarNums[ Aig_ObjFanin1(pObj)->Id ];
+
+        // positive phase
+        *pClas++ = pLits;
+        *pLits++ = 2 * OutVar; 
+        *pLits++ = 2 * pVars[0] + !Aig_ObjFaninC0(pObj); 
+        *pLits++ = 2 * pVars[1] + !Aig_ObjFaninC1(pObj); 
+        // negative phase
+        *pClas++ = pLits;
+        *pLits++ = 2 * OutVar + 1; 
+        *pLits++ = 2 * pVars[0] + Aig_ObjFaninC0(pObj); 
+        *pClas++ = pLits;
+        *pLits++ = 2 * OutVar + 1; 
+        *pLits++ = 2 * pVars[1] + Aig_ObjFaninC1(pObj); 
+    }
+ 
+    // write the constant literal
+    OutVar = pCnf->pVarNums[ Aig_ManConst1(p)->Id ];
+    assert( OutVar <= Aig_ManObjNumMax(p) );
+    *pClas++ = pLits;
+    *pLits++ = 2 * OutVar; 
+
+    // write the output literals
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        OutVar = pCnf->pVarNums[ Aig_ObjFanin0(pObj)->Id ];
+        if ( i < Aig_ManPoNum(p) - nOutputs )
+        {
+            *pClas++ = pLits;
+            *pLits++ = 2 * OutVar + Aig_ObjFaninC0(pObj); 
+        }
+        else
+        {
+            PoVar  = pCnf->pVarNums[ pObj->Id ];
+            // first clause
+            *pClas++ = pLits;
+            *pLits++ = 2 * PoVar; 
+            *pLits++ = 2 * OutVar + !Aig_ObjFaninC0(pObj); 
+            // second clause
+            *pClas++ = pLits;
+            *pLits++ = 2 * PoVar + 1; 
+            *pLits++ = 2 * OutVar + Aig_ObjFaninC0(pObj); 
+        }
+    }
+
+    // verify that the correct number of literals and clauses was written
+    assert( pLits - pCnf->pClauses[0] == nLiterals );
+    assert( pClas - pCnf->pClauses == nClauses );
+    return pCnf;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/cnf_.c b/abc70930/src/aig/cnf/cnf_.c
new file mode 100644
index 00000000..7c9ca499
--- /dev/null
+++ b/abc70930/src/aig/cnf/cnf_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [cnf_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG-to-CNF conversion.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: cnf_.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cnf.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/cnf/module.make b/abc70930/src/aig/cnf/module.make
new file mode 100644
index 00000000..dbcaeba4
--- /dev/null
+++ b/abc70930/src/aig/cnf/module.make
@@ -0,0 +1,8 @@
+SRC +=    src/aig/cnf/cnfCore.c \
+    src/aig/cnf/cnfCut.c \
+    src/aig/cnf/cnfData.c \
+    src/aig/cnf/cnfMan.c \
+    src/aig/cnf/cnfMap.c \
+    src/aig/cnf/cnfPost.c \
+    src/aig/cnf/cnfUtil.c \
+    src/aig/cnf/cnfWrite.c 
diff --git a/abc70930/src/aig/csw/csw.h b/abc70930/src/aig/csw/csw.h
new file mode 100644
index 00000000..1443f4d9
--- /dev/null
+++ b/abc70930/src/aig/csw/csw.h
@@ -0,0 +1,65 @@
+/**CFile****************************************************************
+
+  FileName    [csw.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: csw.h,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __CSW_H__
+#define __CSW_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                           ITERATORS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== cnfCore.c ========================================================*/
+extern Aig_Man_t *     Csw_Sweep( Aig_Man_t * pAig, int nCutsMax, int nLeafMax, int fVerbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/csw/cswCore.c b/abc70930/src/aig/csw/cswCore.c
new file mode 100644
index 00000000..20893058
--- /dev/null
+++ b/abc70930/src/aig/csw/cswCore.c
@@ -0,0 +1,94 @@
+/**CFile****************************************************************
+
+  FileName    [cswCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: cswCore.c,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Csw_Sweep( Aig_Man_t * pAig, int nCutsMax, int nLeafMax, int fVerbose )
+{
+    Csw_Man_t * p;
+    Aig_Man_t * pRes;
+    Aig_Obj_t * pObj, * pObjNew, * pObjRes;
+    int i, clk;
+clk = clock();
+    // start the manager
+    p = Csw_ManStart( pAig, nCutsMax, nLeafMax, fVerbose );
+    // set elementary cuts at the PIs
+    Aig_ManForEachPi( p->pManRes, pObj, i )
+    {
+        Csw_ObjPrepareCuts( p, pObj, 1 );
+        Csw_ObjAddRefs( p, pObj, Aig_ManPi(p->pManAig,i)->nRefs );
+    }
+    // process the nodes
+    Aig_ManForEachNode( pAig, pObj, i )
+    {
+        // create the new node
+        pObjNew = Aig_And( p->pManRes, Csw_ObjChild0Equiv(p, pObj), Csw_ObjChild1Equiv(p, pObj) );
+        // check if this node can be represented using another node
+//        pObjRes = Csw_ObjSweep( p, Aig_Regular(pObjNew), pObj->nRefs > 1 );
+//        pObjRes = Aig_NotCond( pObjRes, Aig_IsComplement(pObjNew) );
+        // try recursively if resubsitution is used
+        do {
+            pObjRes = Csw_ObjSweep( p, Aig_Regular(pObjNew), pObj->nRefs > 1 );
+            pObjRes = Aig_NotCond( pObjRes, Aig_IsComplement(pObjNew) );        
+            pObjNew = pObjRes;
+        } while ( Csw_ObjCuts(p, Aig_Regular(pObjNew)) == NULL && !Aig_ObjIsConst1(Aig_Regular(pObjNew)) );
+        // save the resulting node
+        Csw_ObjSetEquiv( p, pObj, pObjRes );
+        // add to the reference counter
+        Csw_ObjAddRefs( p, Aig_Regular(pObjRes), pObj->nRefs );
+    }
+    // add the POs
+    Aig_ManForEachPo( pAig, pObj, i )
+        Aig_ObjCreatePo( p->pManRes, Csw_ObjChild0Equiv(p, pObj) );
+    // remove dangling nodes 
+    Aig_ManCleanup( p->pManRes );
+    // return the resulting manager
+p->timeTotal = clock() - clk;
+p->timeOther = p->timeTotal - p->timeCuts - p->timeHash;
+    pRes = p->pManRes;
+    Csw_ManStop( p );
+    return pRes;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/csw/cswCut.c b/abc70930/src/aig/csw/cswCut.c
new file mode 100644
index 00000000..b3b7152b
--- /dev/null
+++ b/abc70930/src/aig/csw/cswCut.c
@@ -0,0 +1,602 @@
+/**CFile****************************************************************
+
+  FileName    [cswCut.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: cswCut.c,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the cost of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Csw_CutFindCost( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    Aig_Obj_t * pLeaf;
+    int i, Cost = 0;
+    assert( pCut->nFanins > 0 );
+    Csw_CutForEachLeaf( p->pManRes, pCut, pLeaf, i )
+    {
+//        Cost += pLeaf->nRefs;
+        Cost += Csw_ObjRefs( p, pLeaf );
+//        printf( "%d ", pLeaf->nRefs );
+    }
+//printf( "\n" );
+    return Cost * 100 / pCut->nFanins;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the cost of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline float Csw_CutFindCost2( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    Aig_Obj_t * pLeaf;
+    float Cost = 0.0;
+    int i;
+    assert( pCut->nFanins > 0 );
+    Csw_CutForEachLeaf( p->pManRes, pCut, pLeaf, i )
+        Cost += (float)1.0/pLeaf->nRefs;
+    return 1/Cost;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the next free cut to use.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Csw_Cut_t * Csw_CutFindFree( Csw_Man_t * p, Aig_Obj_t * pObj )
+{
+    Csw_Cut_t * pCut, * pCutMax;
+    int i;
+    pCutMax = NULL;
+    Csw_ObjForEachCut( p, pObj, pCut, i )
+    {
+        if ( pCut->nFanins == 0 )
+            return pCut;
+        if ( pCutMax == NULL || pCutMax->Cost < pCut->Cost )
+            pCutMax = pCut;
+    }
+    assert( pCutMax != NULL );
+    pCutMax->nFanins = 0;
+    return pCutMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the stretching phase of the cut w.r.t. the merged cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Cut_TruthPhase( Csw_Cut_t * pCut, Csw_Cut_t * pCut1 )
+{
+    unsigned uPhase = 0;
+    int i, k;
+    for ( i = k = 0; i < pCut->nFanins; i++ )
+    {
+        if ( k == pCut1->nFanins )
+            break;
+        if ( pCut->pFanins[i] < pCut1->pFanins[k] )
+            continue;
+        assert( pCut->pFanins[i] == pCut1->pFanins[k] );
+        uPhase |= (1 << i);
+        k++;
+    }
+    return uPhase;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs truth table computation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Csw_CutComputeTruth( Csw_Man_t * p, Csw_Cut_t * pCut, Csw_Cut_t * pCut0, Csw_Cut_t * pCut1, int fCompl0, int fCompl1 )
+{
+    // permute the first table
+    if ( fCompl0 ) 
+        Kit_TruthNot( p->puTemp[0], Csw_CutTruth(pCut0), p->nLeafMax );
+    else
+        Kit_TruthCopy( p->puTemp[0], Csw_CutTruth(pCut0), p->nLeafMax );
+    Kit_TruthStretch( p->puTemp[2], p->puTemp[0], pCut0->nFanins, p->nLeafMax, Cut_TruthPhase(pCut, pCut0), 0 );
+    // permute the second table
+    if ( fCompl1 ) 
+        Kit_TruthNot( p->puTemp[1], Csw_CutTruth(pCut1), p->nLeafMax );
+    else
+        Kit_TruthCopy( p->puTemp[1], Csw_CutTruth(pCut1), p->nLeafMax );
+    Kit_TruthStretch( p->puTemp[3], p->puTemp[1], pCut1->nFanins, p->nLeafMax, Cut_TruthPhase(pCut, pCut1), 0 );
+    // produce the resulting table
+    Kit_TruthAnd( Csw_CutTruth(pCut), p->puTemp[2], p->puTemp[3], p->nLeafMax );
+//    assert( pCut->nFanins >= Kit_TruthSupportSize( Csw_CutTruth(pCut), p->nLeafMax ) );
+    return Csw_CutTruth(pCut);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs support minimization for the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Csw_CutSupportMinimize( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    unsigned * pTruth;
+    int uSupp, nFansNew, i, k;
+    // get truth table
+    pTruth = Csw_CutTruth( pCut );
+    // get support 
+    uSupp = Kit_TruthSupport( pTruth, p->nLeafMax );
+    // get the new support size
+    nFansNew = Kit_WordCountOnes( uSupp );
+    // check if there are redundant variables
+    if ( nFansNew == pCut->nFanins )
+        return nFansNew;
+    assert( nFansNew < pCut->nFanins );
+    // minimize support
+    Kit_TruthShrink( p->puTemp[0], pTruth, nFansNew, p->nLeafMax, uSupp, 1 );
+    for ( i = k = 0; i < pCut->nFanins; i++ )
+        if ( uSupp & (1 << i) )
+            pCut->pFanins[k++] = pCut->pFanins[i];
+    assert( k == nFansNew );
+    pCut->nFanins = nFansNew;
+//    assert( nFansNew == Kit_TruthSupportSize( pTruth, p->nLeafMax ) );
+//Extra_PrintBinary( stdout, pTruth, (1<<p->nLeafMax) ); printf( "\n" );
+    return nFansNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pDom is contained in pCut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Csw_CutCheckDominance( Csw_Cut_t * pDom, Csw_Cut_t * pCut )
+{
+    int i, k;
+    for ( i = 0; i < (int)pDom->nFanins; i++ )
+    {
+        for ( k = 0; k < (int)pCut->nFanins; k++ )
+            if ( pDom->pFanins[i] == pCut->pFanins[k] )
+                break;
+        if ( k == (int)pCut->nFanins ) // node i in pDom is not contained in pCut
+            return 0;
+    }
+    // every node in pDom is contained in pCut
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the cut is contained.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Csw_CutFilter( Csw_Man_t * p, Aig_Obj_t * pObj, Csw_Cut_t * pCut )
+{ 
+    Csw_Cut_t * pTemp;
+    int i;
+    // go through the cuts of the node
+    Csw_ObjForEachCut( p, pObj, pTemp, i )
+    {
+        if ( pTemp->nFanins < 2 )
+            continue;
+        if ( pTemp == pCut )
+            continue;
+        if ( pTemp->nFanins > pCut->nFanins )
+        {
+            // skip the non-contained cuts
+            if ( (pTemp->uSign & pCut->uSign) != pCut->uSign )
+                continue;
+            // check containment seriously
+            if ( Csw_CutCheckDominance( pCut, pTemp ) )
+            {
+                // remove contained cut
+                pTemp->nFanins = 0;
+            }
+         }
+        else
+        {
+            // skip the non-contained cuts
+            if ( (pTemp->uSign & pCut->uSign) != pTemp->uSign )
+                continue;
+            // check containment seriously
+            if ( Csw_CutCheckDominance( pTemp, pCut ) )
+            {
+                // remove the given
+                pCut->nFanins = 0;
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two cuts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Csw_CutMergeOrdered( Csw_Man_t * p, Csw_Cut_t * pC0, Csw_Cut_t * pC1, Csw_Cut_t * pC )
+{ 
+    int i, k, c;
+    assert( pC0->nFanins >= pC1->nFanins );
+    // the case of the largest cut sizes
+    if ( pC0->nFanins == p->nLeafMax && pC1->nFanins == p->nLeafMax )
+    {
+        for ( i = 0; i < pC0->nFanins; i++ )
+            if ( pC0->pFanins[i] != pC1->pFanins[i] )
+                return 0;
+        for ( i = 0; i < pC0->nFanins; i++ )
+            pC->pFanins[i] = pC0->pFanins[i];
+        pC->nFanins = pC0->nFanins;
+        return 1;
+    }
+    // the case when one of the cuts is the largest
+    if ( pC0->nFanins == p->nLeafMax )
+    {
+        for ( i = 0; i < pC1->nFanins; i++ )
+        {
+            for ( k = pC0->nFanins - 1; k >= 0; k-- )
+                if ( pC0->pFanins[k] == pC1->pFanins[i] )
+                    break;
+            if ( k == -1 ) // did not find
+                return 0;
+        }
+        for ( i = 0; i < pC0->nFanins; i++ )
+            pC->pFanins[i] = pC0->pFanins[i];
+        pC->nFanins = pC0->nFanins;
+        return 1;
+    }
+
+    // compare two cuts with different numbers
+    i = k = 0;
+    for ( c = 0; c < p->nLeafMax; c++ )
+    {
+        if ( k == pC1->nFanins )
+        {
+            if ( i == pC0->nFanins )
+            {
+                pC->nFanins = c;
+                return 1;
+            }
+            pC->pFanins[c] = pC0->pFanins[i++];
+            continue;
+        }
+        if ( i == pC0->nFanins )
+        {
+            if ( k == pC1->nFanins )
+            {
+                pC->nFanins = c;
+                return 1;
+            }
+            pC->pFanins[c] = pC1->pFanins[k++];
+            continue;
+        }
+        if ( pC0->pFanins[i] < pC1->pFanins[k] )
+        {
+            pC->pFanins[c] = pC0->pFanins[i++];
+            continue;
+        }
+        if ( pC0->pFanins[i] > pC1->pFanins[k] )
+        {
+            pC->pFanins[c] = pC1->pFanins[k++];
+            continue;
+        }
+        pC->pFanins[c] = pC0->pFanins[i++]; 
+        k++;
+    }
+    if ( i < pC0->nFanins || k < pC1->nFanins )
+        return 0;
+    pC->nFanins = c;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the object for FPGA mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Csw_CutMerge( Csw_Man_t * p, Csw_Cut_t * pCut0, Csw_Cut_t * pCut1, Csw_Cut_t * pCut )
+{ 
+    assert( p->nLeafMax > 0 );
+    // merge the nodes
+    if ( pCut0->nFanins < pCut1->nFanins )
+    {
+        if ( !Csw_CutMergeOrdered( p, pCut1, pCut0, pCut ) )
+            return 0;
+    }
+    else
+    {
+        if ( !Csw_CutMergeOrdered( p, pCut0, pCut1, pCut ) )
+            return 0;
+    }
+    pCut->uSign = pCut0->uSign | pCut1->uSign;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Consider cut with more than 2 fanins having 2 true variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Csw_ObjTwoVarCut( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    Aig_Obj_t * pRes, * pIn0, * pIn1;
+    int nVars, uTruth, fCompl = 0;
+    assert( pCut->nFanins > 2 );
+    // minimize support of this cut
+    nVars = Csw_CutSupportMinimize( p, pCut );
+    assert( nVars == 2 );
+    // get the fanins
+    pIn0 = Aig_ManObj( p->pManRes, pCut->pFanins[0] );
+    pIn1 = Aig_ManObj( p->pManRes, pCut->pFanins[1] );
+    // derive the truth table
+    uTruth = 0xF & *Csw_CutTruth(pCut);
+    if ( uTruth == 14 || uTruth == 13 || uTruth == 11 || uTruth == 7 )
+    {
+        uTruth = 0xF & ~uTruth;
+        fCompl = 1;
+    }
+    // compute the result
+    pRes = NULL;
+    if ( uTruth == 1  )  // 0001  // 1110  14
+        pRes = Aig_And( p->pManRes, Aig_Not(pIn0), Aig_Not(pIn1) );
+    if ( uTruth == 2  )  // 0010  // 1101  13 
+        pRes = Aig_And( p->pManRes,         pIn0 , Aig_Not(pIn1) );
+    if ( uTruth == 4  )  // 0100  // 1011  11
+        pRes = Aig_And( p->pManRes, Aig_Not(pIn0),         pIn1  );
+    if ( uTruth == 8  )  // 1000  // 0111   7
+        pRes = Aig_And( p->pManRes,         pIn0 ,         pIn1  );
+    if ( pRes )
+        pRes = Aig_NotCond( pRes, fCompl );
+    return pRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Csw_Cut_t * Csw_ObjPrepareCuts( Csw_Man_t * p, Aig_Obj_t * pObj, int fTriv )
+{
+    Csw_Cut_t * pCutSet, * pCut;
+    int i;
+    // create the cutset of the node
+    pCutSet = (Csw_Cut_t *)Aig_MmFixedEntryFetch( p->pMemCuts );
+    Csw_ObjSetCuts( p, pObj, pCutSet );
+    Csw_ObjForEachCut( p, pObj, pCut, i )
+    {
+        pCut->nFanins = 0;
+        pCut->iNode = pObj->Id;
+        pCut->nCutSize = p->nCutSize;
+        pCut->nLeafMax = p->nLeafMax;
+    }
+    // add unit cut if needed
+    if ( fTriv )
+    {
+        pCut = pCutSet;
+        pCut->Cost = 0;
+        pCut->iNode = pObj->Id;
+        pCut->nFanins = 1;
+        pCut->pFanins[0] = pObj->Id;
+        pCut->uSign = Aig_ObjCutSign( pObj->Id );
+        memset( Csw_CutTruth(pCut), 0xAA, sizeof(unsigned) * p->nTruthWords );
+    }
+    return pCutSet;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives cuts for one node and sweeps this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Csw_ObjSweep( Csw_Man_t * p, Aig_Obj_t * pObj, int fTriv )
+{
+    int fUseResub = 1;
+    Csw_Cut_t * pCut0, * pCut1, * pCut, * pCutSet;
+    Aig_Obj_t * pFanin0 = Aig_ObjFanin0(pObj);
+    Aig_Obj_t * pFanin1 = Aig_ObjFanin1(pObj);
+    Aig_Obj_t * pObjNew;
+    unsigned * pTruth;
+    int i, k, nVars, nFanins, iVar, clk;
+
+    assert( !Aig_IsComplement(pObj) );
+    if ( !Aig_ObjIsNode(pObj) )
+        return pObj;
+    if ( Csw_ObjCuts(p, pObj) )
+        return pObj;
+    // the node is not processed yet
+    assert( Csw_ObjCuts(p, pObj) == NULL );
+    assert( Aig_ObjIsNode(pObj) );
+
+    // set up the first cut
+    pCutSet = Csw_ObjPrepareCuts( p, pObj, fTriv );
+
+    // compute pair-wise cut combinations while checking table
+    Csw_ObjForEachCut( p, pFanin0, pCut0, i )
+    if ( pCut0->nFanins > 0 )
+    Csw_ObjForEachCut( p, pFanin1, pCut1, k )
+    if ( pCut1->nFanins > 0 )
+    {
+        // make sure K-feasible cut exists
+        if ( Kit_WordCountOnes(pCut0->uSign | pCut1->uSign) > p->nLeafMax )
+            continue;
+        // get the next cut of this node
+        pCut = Csw_CutFindFree( p, pObj );
+clk = clock();
+        // assemble the new cut
+        if ( !Csw_CutMerge( p, pCut0, pCut1, pCut ) )
+        {
+            assert( pCut->nFanins == 0 );
+            continue;
+        }
+        // check containment
+        if ( Csw_CutFilter( p, pObj, pCut ) )
+        {
+            assert( pCut->nFanins == 0 );
+            continue;
+        }
+        // create its truth table
+        pTruth = Csw_CutComputeTruth( p, pCut, pCut0, pCut1, Aig_ObjFaninC0(pObj), Aig_ObjFaninC1(pObj) );
+        // support minimize the truth table
+        nFanins = pCut->nFanins;
+//        nVars = Csw_CutSupportMinimize( p, pCut ); // leads to quality degradation
+        nVars = Kit_TruthSupportSize( pTruth, p->nLeafMax );
+p->timeCuts += clock() - clk;
+
+        // check for trivial truth tables
+        if ( nVars == 0 )
+        {
+            p->nNodesTriv0++;
+            return Aig_NotCond( Aig_ManConst1(p->pManRes), !(pTruth[0] & 1) );
+        }
+        if ( nVars == 1 )
+        {
+            p->nNodesTriv1++;
+            iVar = Kit_WordFindFirstBit( Kit_TruthSupport(pTruth, p->nLeafMax) );
+            assert( iVar < pCut->nFanins );
+            return Aig_NotCond( Aig_ManObj(p->pManRes, pCut->pFanins[iVar]), (pTruth[0] & 1) );
+        }
+        if ( nVars == 2 && nFanins > 2 && fUseResub )
+        {
+            if ( pObjNew = Csw_ObjTwoVarCut( p, pCut ) )
+            {
+                p->nNodesTriv2++;
+                return pObjNew;
+            }
+        }
+
+        // check if an equivalent node with the same cut exists
+clk = clock();
+        pObjNew = pCut->nFanins > 2 ? Csw_TableCutLookup( p, pCut ) : NULL;
+p->timeHash += clock() - clk;
+        if ( pObjNew )
+        {
+            p->nNodesCuts++;
+            return pObjNew;
+        }
+
+        // assign the cost
+        pCut->Cost = Csw_CutFindCost( p, pCut );
+        assert( pCut->nFanins > 0 );
+        assert( pCut->Cost > 0 );
+    }
+    p->nNodesTried++;
+
+    // load the resulting cuts into the table
+clk = clock();
+    Csw_ObjForEachCut( p, pObj, pCut, i )
+    {
+        if ( pCut->nFanins > 2 )
+        {
+            assert( pCut->Cost > 0 );
+            Csw_TableCutInsert( p, pCut );
+        }
+    }
+p->timeHash += clock() - clk;
+
+    // return the node if could not replace it
+    return pObj;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/csw/cswInt.h b/abc70930/src/aig/csw/cswInt.h
new file mode 100644
index 00000000..37efe9b4
--- /dev/null
+++ b/abc70930/src/aig/csw/cswInt.h
@@ -0,0 +1,157 @@
+/**CFile****************************************************************
+
+  FileName    [cswInt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: cswInt.h,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __CSW_INT_H__
+#define __CSW_INT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "aig.h"
+#include "dar.h"
+#include "kit.h"
+#include "csw.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Csw_Man_t_            Csw_Man_t;
+typedef struct Csw_Cut_t_            Csw_Cut_t;
+
+// the cut used to represent node in the AIG
+struct Csw_Cut_t_
+{
+    Csw_Cut_t *     pNext;           // the next cut in the table 
+    int             Cost;            // the cost of the cut
+//    float           Cost;            // the cost of the cut
+    unsigned        uSign;           // cut signature
+    int             iNode;           // the node, for which it is the cut
+    short           nCutSize;        // the number of bytes in the cut
+    char            nLeafMax;        // the maximum number of fanins
+    char            nFanins;         // the current number of fanins
+    int             pFanins[0];      // the fanins (followed by the truth table)
+};
+
+// the CNF computation manager
+struct Csw_Man_t_
+{
+    // AIG manager
+    Aig_Man_t *     pManAig;         // the input AIG manager
+    Aig_Man_t *     pManRes;         // the output AIG manager
+    Aig_Obj_t **    pEquiv;          // the equivalent nodes in the resulting manager
+    Csw_Cut_t **    pCuts;           // the cuts for each node in the output manager
+    int *           pnRefs;          // the number of references of each new node
+    // hash table for cuts
+    Csw_Cut_t **    pTable;          // the table composed of cuts 
+    int             nTableSize;      // the size of hash table
+    // parameters
+    int             nCutsMax;        // the max number of cuts at the node
+    int             nLeafMax;        // the max number of leaves of a cut
+    int             fVerbose;        // enables verbose output
+    // internal variables
+    int             nCutSize;        // the number of bytes needed to store one cut
+    int             nTruthWords;     // the number of truth table words
+    Aig_MmFixed_t * pMemCuts;        // memory manager for cuts
+    unsigned *      puTemp[4];       // used for the truth table computation
+    // statistics
+    int             nNodesTriv0;     // the number of trivial nodes
+    int             nNodesTriv1;     // the number of trivial nodes
+    int             nNodesTriv2;     // the number of trivial nodes
+    int             nNodesCuts;      // the number of rewritten nodes
+    int             nNodesTried;     // the number of nodes tried
+    int             timeCuts;        // time to compute the cut and its truth table
+    int             timeHash;        // time for hashing cuts
+    int             timeOther;       // other time
+    int             timeTotal;       // total time
+};
+
+static inline int          Csw_CutLeaveNum( Csw_Cut_t * pCut )          { return pCut->nFanins;                                   }
+static inline int *        Csw_CutLeaves( Csw_Cut_t * pCut )            { return pCut->pFanins;                                   }
+static inline unsigned *   Csw_CutTruth( Csw_Cut_t * pCut )             { return (unsigned *)(pCut->pFanins + pCut->nLeafMax);    }
+static inline Csw_Cut_t *  Csw_CutNext( Csw_Cut_t * pCut )              { return (Csw_Cut_t *)(((char *)pCut) + pCut->nCutSize);  }
+
+static inline int          Csw_ObjRefs( Csw_Man_t * p, Aig_Obj_t * pObj )                         { return p->pnRefs[pObj->Id];   }
+static inline void         Csw_ObjAddRefs( Csw_Man_t * p, Aig_Obj_t * pObj, int nRefs )           { p->pnRefs[pObj->Id] += nRefs; }
+
+static inline Csw_Cut_t *  Csw_ObjCuts( Csw_Man_t * p, Aig_Obj_t * pObj )                         { return p->pCuts[pObj->Id];    }
+static inline void         Csw_ObjSetCuts( Csw_Man_t * p, Aig_Obj_t * pObj, Csw_Cut_t * pCuts )   { p->pCuts[pObj->Id] = pCuts;   }
+
+static inline Aig_Obj_t *  Csw_ObjEquiv( Csw_Man_t * p, Aig_Obj_t * pObj )                        { return p->pEquiv[pObj->Id];   }
+static inline void         Csw_ObjSetEquiv( Csw_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pEquiv ) { p->pEquiv[pObj->Id] = pEquiv; }
+
+static inline Aig_Obj_t *  Csw_ObjChild0Equiv( Csw_Man_t * p, Aig_Obj_t * pObj ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin0(pObj)? Aig_NotCond(Csw_ObjEquiv(p, Aig_ObjFanin0(pObj)), Aig_ObjFaninC0(pObj)) : NULL;  }
+static inline Aig_Obj_t *  Csw_ObjChild1Equiv( Csw_Man_t * p, Aig_Obj_t * pObj ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin1(pObj)? Aig_NotCond(Csw_ObjEquiv(p, Aig_ObjFanin1(pObj)), Aig_ObjFaninC1(pObj)) : NULL;  }
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                           ITERATORS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over cuts of the node
+#define Csw_ObjForEachCut( p, pObj, pCut, i )                           \
+    for ( i = 0, pCut = Csw_ObjCuts(p, pObj); i < p->nCutsMax; i++, pCut = Csw_CutNext(pCut) ) 
+// iterator over leaves of the cut
+#define Csw_CutForEachLeaf( p, pCut, pLeaf, i )                         \
+    for ( i = 0; (i < (int)(pCut)->nFanins) && ((pLeaf) = Aig_ManObj(p, (pCut)->pFanins[i])); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== cnfCut.c ========================================================*/
+extern Csw_Cut_t *    Csw_ObjPrepareCuts( Csw_Man_t * p, Aig_Obj_t * pObj, int fTriv );
+extern Aig_Obj_t *    Csw_ObjSweep( Csw_Man_t * p, Aig_Obj_t * pObj, int fTriv );
+/*=== cnfMan.c ========================================================*/
+extern Csw_Man_t *    Csw_ManStart( Aig_Man_t * pMan, int nCutsMax, int nLeafMax, int fVerbose );
+extern void           Csw_ManStop( Csw_Man_t * p );
+/*=== cnfTable.c ========================================================*/
+extern int            Csw_TableCountCuts( Csw_Man_t * p );
+extern void           Csw_TableCutInsert( Csw_Man_t * p, Csw_Cut_t * pCut );
+extern Aig_Obj_t *    Csw_TableCutLookup( Csw_Man_t * p, Csw_Cut_t * pCut );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/csw/cswMan.c b/abc70930/src/aig/csw/cswMan.c
new file mode 100644
index 00000000..c3061dee
--- /dev/null
+++ b/abc70930/src/aig/csw/cswMan.c
@@ -0,0 +1,125 @@
+/**CFile****************************************************************
+
+  FileName    [cswMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: cswMan.c,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the cut sweeping manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Csw_Man_t * Csw_ManStart( Aig_Man_t * pMan, int nCutsMax, int nLeafMax, int fVerbose )
+{
+    Csw_Man_t * p;
+    Aig_Obj_t * pObj;
+    int i;
+    assert( nCutsMax >= 2  );
+    assert( nLeafMax <= 16 );
+    // allocate the fraiging manager
+    p = ALLOC( Csw_Man_t, 1 );
+    memset( p, 0, sizeof(Csw_Man_t) );
+    p->nCutsMax = nCutsMax;
+    p->nLeafMax = nLeafMax;
+    p->fVerbose = fVerbose;
+    p->pManAig  = pMan;
+    // create the new manager
+    p->pManRes  = Aig_ManStartFrom( pMan );
+    assert( Aig_ManPiNum(p->pManAig) == Aig_ManPiNum(p->pManRes) );
+    // allocate room for cuts and equivalent nodes
+    p->pnRefs   = ALLOC( int, Aig_ManObjNumMax(pMan) );
+    p->pEquiv   = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(pMan) );
+    p->pCuts    = ALLOC( Csw_Cut_t *, Aig_ManObjNumMax(pMan) );
+    memset( p->pCuts, 0, sizeof(Aig_Obj_t *) * Aig_ManObjNumMax(pMan) );
+    memset( p->pnRefs, 0, sizeof(int) * Aig_ManObjNumMax(pMan) );
+    // allocate memory manager
+    p->nTruthWords = Aig_TruthWordNum(nLeafMax);
+    p->nCutSize = sizeof(Csw_Cut_t) + sizeof(int) * nLeafMax + sizeof(unsigned) * p->nTruthWords;
+    p->pMemCuts = Aig_MmFixedStart( p->nCutSize * p->nCutsMax, 512 );
+    // allocate hash table for cuts
+    p->nTableSize = Aig_PrimeCudd( Aig_ManNodeNum(pMan) * p->nCutsMax / 2 );
+    p->pTable = ALLOC( Csw_Cut_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Aig_Obj_t *) * p->nTableSize );
+    // set the pointers to the available fraig nodes
+    Csw_ObjSetEquiv( p, Aig_ManConst1(p->pManAig), Aig_ManConst1(p->pManRes) );
+    Aig_ManForEachPi( p->pManAig, pObj, i )
+        Csw_ObjSetEquiv( p, pObj, Aig_ManPi(p->pManRes, i) );
+    // room for temporary truth tables
+    p->puTemp[0] = ALLOC( unsigned, 4 * p->nTruthWords );
+    p->puTemp[1] = p->puTemp[0] + p->nTruthWords;
+    p->puTemp[2] = p->puTemp[1] + p->nTruthWords;
+    p->puTemp[3] = p->puTemp[2] + p->nTruthWords;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Csw_ManStop( Csw_Man_t * p )
+{
+    if ( p->fVerbose )
+    {
+        int nNodesBeg = Aig_ManNodeNum(p->pManAig);
+        int nNodesEnd = Aig_ManNodeNum(p->pManRes);
+        printf( "Beg = %7d.  End = %7d.  (%6.2f %%)  Try = %7d.  Cuts = %8d.\n", 
+            nNodesBeg, nNodesEnd, 100.0*(nNodesBeg-nNodesEnd)/nNodesBeg,
+            p->nNodesTried, Csw_TableCountCuts( p ) );
+        printf( "Triv0 = %6d.  Triv1 = %6d.  Triv2 = %6d.  Cut-replace = %6d.\n", 
+            p->nNodesTriv0, p->nNodesTriv1, p->nNodesTriv2, p->nNodesCuts );
+        PRTP( "Cuts    ", p->timeCuts,     p->timeTotal );
+        PRTP( "Hashing ", p->timeHash,     p->timeTotal );
+        PRTP( "Other   ", p->timeOther,    p->timeTotal );
+        PRTP( "TOTAL   ", p->timeTotal,    p->timeTotal );
+    }
+    free( p->puTemp[0] );
+    Aig_MmFixedStop( p->pMemCuts, 0 );
+    free( p->pnRefs );
+    free( p->pEquiv );
+    free( p->pCuts );
+    free( p->pTable );
+    free( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/csw/cswTable.c b/abc70930/src/aig/csw/cswTable.c
new file mode 100644
index 00000000..87e36ae1
--- /dev/null
+++ b/abc70930/src/aig/csw/cswTable.c
@@ -0,0 +1,161 @@
+/**CFile****************************************************************
+
+  FileName    [cswTable.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: cswTable.c,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes hash value of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Csw_CutHash( Csw_Cut_t * pCut )
+{
+    static int s_FPrimes[128] = { 
+        1009, 1049, 1093, 1151, 1201, 1249, 1297, 1361, 1427, 1459, 
+        1499, 1559, 1607, 1657, 1709, 1759, 1823, 1877, 1933, 1997, 
+        2039, 2089, 2141, 2213, 2269, 2311, 2371, 2411, 2467, 2543, 
+        2609, 2663, 2699, 2741, 2797, 2851, 2909, 2969, 3037, 3089, 
+        3169, 3221, 3299, 3331, 3389, 3461, 3517, 3557, 3613, 3671, 
+        3719, 3779, 3847, 3907, 3943, 4013, 4073, 4129, 4201, 4243, 
+        4289, 4363, 4441, 4493, 4549, 4621, 4663, 4729, 4793, 4871, 
+        4933, 4973, 5021, 5087, 5153, 5227, 5281, 5351, 5417, 5471, 
+        5519, 5573, 5651, 5693, 5749, 5821, 5861, 5923, 6011, 6073, 
+        6131, 6199, 6257, 6301, 6353, 6397, 6481, 6563, 6619, 6689, 
+        6737, 6803, 6863, 6917, 6977, 7027, 7109, 7187, 7237, 7309, 
+        7393, 7477, 7523, 7561, 7607, 7681, 7727, 7817, 7877, 7933, 
+        8011, 8039, 8059, 8081, 8093, 8111, 8123, 8147
+    };
+    unsigned uHash;
+    int i;
+    assert( pCut->nFanins <= 16 );
+    uHash = 0;
+    for ( i = 0; i < pCut->nFanins; i++ )
+        uHash ^= pCut->pFanins[i] * s_FPrimes[i];
+    return uHash;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the total number of cuts in the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Csw_TableCountCuts( Csw_Man_t * p )
+{
+    Csw_Cut_t * pEnt;
+    int i, Counter = 0;
+    for ( i = 0; i < p->nTableSize; i++ )
+        for ( pEnt = p->pTable[i]; pEnt; pEnt = pEnt->pNext )
+            Counter++;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the cut to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Csw_TableCutInsert( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    int iEntry = Csw_CutHash(pCut) % p->nTableSize;
+    pCut->pNext = p->pTable[iEntry];
+    p->pTable[iEntry] = pCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns an equivalent node if it exists.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Csw_TableCutLookup( Csw_Man_t * p, Csw_Cut_t * pCut )
+{
+    Aig_Obj_t * pRes = NULL;
+    Csw_Cut_t * pEnt;
+    unsigned * pTruthNew, * pTruthOld;
+    int iEntry = Csw_CutHash(pCut) % p->nTableSize;
+    for ( pEnt = p->pTable[iEntry]; pEnt; pEnt = pEnt->pNext )
+    {
+        if ( pEnt->nFanins != pCut->nFanins )
+            continue;
+        if ( pEnt->uSign != pCut->uSign )
+            continue;
+        if ( memcmp( pEnt->pFanins, pCut->pFanins, sizeof(int) * pCut->nFanins ) )
+            continue;
+        pTruthOld = Csw_CutTruth(pEnt);
+        pTruthNew = Csw_CutTruth(pCut);
+        if ( (pTruthOld[0] & 1) == (pTruthNew[0] & 1) )
+        {
+            if ( Kit_TruthIsEqual( pTruthOld, pTruthNew, pCut->nFanins ) )
+            {
+                pRes = Aig_ManObj( p->pManRes, pEnt->iNode );
+                assert( pRes->fPhase == Aig_ManObj( p->pManRes, pCut->iNode )->fPhase );
+                break;
+            }
+        }
+        else
+        {
+            if ( Kit_TruthIsOpposite( pTruthOld, pTruthNew, pCut->nFanins ) )
+            {
+                pRes = Aig_Not( Aig_ManObj( p->pManRes, pEnt->iNode ) );
+                assert( Aig_Regular(pRes)->fPhase != Aig_ManObj( p->pManRes, pCut->iNode )->fPhase );
+                break;
+            }
+        }
+    }
+    return pRes;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/csw/csw_.c b/abc70930/src/aig/csw/csw_.c
new file mode 100644
index 00000000..1c59f152
--- /dev/null
+++ b/abc70930/src/aig/csw/csw_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [csw_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cut sweeping.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - July 11, 2007.]
+
+  Revision    [$Id: csw_.c,v 1.00 2007/07/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cswInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/csw/module.make b/abc70930/src/aig/csw/module.make
new file mode 100644
index 00000000..8fdb7bef
--- /dev/null
+++ b/abc70930/src/aig/csw/module.make
@@ -0,0 +1,4 @@
+SRC +=    src/aig/csw/cswCore.c \
+    src/aig/csw/cswCut.c \
+    src/aig/csw/cswMan.c \
+    src/aig/csw/cswTable.c 
diff --git a/abc70930/src/aig/dar/dar.h b/abc70930/src/aig/dar/dar.h
new file mode 100644
index 00000000..2a4fcaf3
--- /dev/null
+++ b/abc70930/src/aig/dar/dar.h
@@ -0,0 +1,106 @@
+/**CFile****************************************************************
+
+  FileName    [dar.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: dar.h,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __DAR_H__
+#define __DAR_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Dar_RwrPar_t_            Dar_RwrPar_t;
+typedef struct Dar_RefPar_t_            Dar_RefPar_t;
+
+struct Dar_RwrPar_t_  
+{
+    int              nCutsMax;       // the maximum number of cuts to try
+    int              nSubgMax;       // the maximum number of subgraphs to try
+    int              fFanout;        // support fanout representation
+    int              fUpdateLevel;   // update level 
+    int              fUseZeros;      // performs zero-cost replacement
+    int              fVerbose;       // enables verbose output
+    int              fVeryVerbose;   // enables very verbose output
+};
+
+struct Dar_RefPar_t_  
+{
+    int              nMffcMin;       // the min MFFC size for which refactoring is used
+    int              nLeafMax;       // the max number of leaves of a cut
+    int              nCutsMax;       // the max number of cuts to consider  
+    int              fExtend;        // extends the cut below MFFC
+    int              fUpdateLevel;   // updates the level after each move
+    int              fUseZeros;      // perform zero-cost replacements
+    int              fVerbose;       // verbosity level
+    int              fVeryVerbose;   // enables very verbose output
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== darLib.c ========================================================*/
+extern void            Dar_LibStart();
+extern void            Dar_LibStop();
+/*=== darBalance.c ========================================================*/
+extern Aig_Man_t *     Dar_ManBalance( Aig_Man_t * p, int fUpdateLevel );
+/*=== darCore.c ========================================================*/
+extern void            Dar_ManDefaultRwrParams( Dar_RwrPar_t * pPars );
+extern int             Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars );
+extern Aig_MmFixed_t * Dar_ManComputeCuts( Aig_Man_t * pAig, int nCutsMax );
+/*=== darRefact.c ========================================================*/
+extern void            Dar_ManDefaultRefParams( Dar_RefPar_t * pPars );
+extern int             Dar_ManRefactor( Aig_Man_t * pAig, Dar_RefPar_t * pPars );
+/*=== darScript.c ========================================================*/
+extern Aig_Man_t *     Dar_ManRewriteDefault( Aig_Man_t * pAig );
+extern Aig_Man_t *     Dar_ManRwsat( Aig_Man_t * pAig, int fBalance, int fVerbose );
+extern Aig_Man_t *     Dar_ManCompress( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose );
+extern Aig_Man_t *     Dar_ManCompress2( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose );
+extern Aig_Man_t *     Dar_ManChoice( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/dar/darBalance.c b/abc70930/src/aig/dar/darBalance.c
new file mode 100644
index 00000000..cc1eb668
--- /dev/null
+++ b/abc70930/src/aig/dar/darBalance.c
@@ -0,0 +1,398 @@
+/**CFile****************************************************************
+
+  FileName    [darBalance.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Algebraic AIG balancing.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darBalance.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Aig_Obj_t * Dar_Balance_rec( Aig_Man_t * pNew, Aig_Obj_t * pObj, Vec_Vec_t * vStore, int Level, int fUpdateLevel );
+static Vec_Ptr_t * Dar_BalanceCone( Aig_Obj_t * pObj, Vec_Vec_t * vStore, int Level );
+static int         Dar_BalanceFindLeft( Vec_Ptr_t * vSuper );
+static void        Dar_BalancePermute( Aig_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor );
+static void        Dar_BalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Aig_Obj_t * pObj );
+static Aig_Obj_t * Dar_BalanceBuildSuper( Aig_Man_t * p, Vec_Ptr_t * vSuper, Aig_Type_t Type, int fUpdateLevel );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs algebraic balancing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManBalance( Aig_Man_t * p, int fUpdateLevel )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj, * pDriver, * pObjNew;
+    Vec_Vec_t * vStore;
+    int i;
+    // create the new manager 
+    pNew = Aig_ManStart( Aig_ManObjNumMax(p) );
+    pNew->pName = Aig_UtilStrsav( p->pName );
+    pNew->nRegs = p->nRegs;
+    pNew->nAsserts = p->nAsserts;
+    if ( p->vFlopNums )
+        pNew->vFlopNums = Vec_IntDup( p->vFlopNums );
+    // map the PI nodes
+    Aig_ManCleanData( p );
+    Aig_ManConst1(p)->pData = Aig_ManConst1(pNew);
+    Aig_ManForEachPi( p, pObj, i )
+        pObj->pData = Aig_ObjCreatePi(pNew);
+    // balance the AIG
+    vStore = Vec_VecAlloc( 50 );
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        pDriver = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+        pObjNew = Dar_Balance_rec( pNew, Aig_Regular(pDriver), vStore, 0, fUpdateLevel );
+        pObjNew = Aig_NotCond( pObjNew, Aig_IsComplement(pDriver) );
+        Aig_ObjCreatePo( pNew, pObjNew );
+    }
+    Vec_VecFree( vStore );
+    // remove dangling nodes
+    if ( (i = Aig_ManCleanup( pNew )) )
+        printf( "Cleanup after balancing removed %d dangling nodes.\n", i );
+    // check the resulting AIG
+    if ( !Aig_ManCheck(pNew) )
+        printf( "Dar_ManBalance(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the new node constructed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Dar_Balance_rec( Aig_Man_t * pNew, Aig_Obj_t * pObjOld, Vec_Vec_t * vStore, int Level, int fUpdateLevel )
+{
+    Aig_Obj_t * pObjNew;
+    Vec_Ptr_t * vSuper;
+    int i;
+    assert( !Aig_IsComplement(pObjOld) );
+    assert( !Aig_ObjIsBuf(pObjOld) );
+    // return if the result is known
+    if ( pObjOld->pData )
+        return pObjOld->pData;
+    assert( Aig_ObjIsNode(pObjOld) );
+    // get the implication supergate
+    vSuper = Dar_BalanceCone( pObjOld, vStore, Level );
+    // check if supergate contains two nodes in the opposite polarity
+    if ( vSuper->nSize == 0 )
+        return pObjOld->pData = Aig_ManConst0(pNew);
+    if ( Vec_PtrSize(vSuper) < 2 )
+        printf( "BUG!\n" );
+    // for each old node, derive the new well-balanced node
+    for ( i = 0; i < Vec_PtrSize(vSuper); i++ )
+    {
+        pObjNew = Dar_Balance_rec( pNew, Aig_Regular(vSuper->pArray[i]), vStore, Level + 1, fUpdateLevel );
+        vSuper->pArray[i] = Aig_NotCond( pObjNew, Aig_IsComplement(vSuper->pArray[i]) );
+    }
+    // build the supergate
+    pObjNew = Dar_BalanceBuildSuper( pNew, vSuper, Aig_ObjType(pObjOld), fUpdateLevel );
+    // make sure the balanced node is not assigned
+//    assert( pObjOld->Level >= Aig_Regular(pObjNew)->Level );
+    assert( pObjOld->pData == NULL );
+    return pObjOld->pData = pObjNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_BalanceCone_rec( Aig_Obj_t * pRoot, Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    int RetValue1, RetValue2, i;
+    // check if the node is visited
+    if ( Aig_Regular(pObj)->fMarkB )
+    {
+        // check if the node occurs in the same polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == pObj )
+                return 1;
+        // check if the node is present in the opposite polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == Aig_Not(pObj) )
+                return -1;
+        assert( 0 );
+        return 0;
+    }
+    // if the new node is complemented or a PI, another gate begins
+    if ( pObj != pRoot && (Aig_IsComplement(pObj) || Aig_ObjType(pObj) != Aig_ObjType(pRoot) || Aig_ObjRefs(pObj) > 1) )
+    {
+        Vec_PtrPush( vSuper, pObj );
+        Aig_Regular(pObj)->fMarkB = 1;
+        return 0;
+    }
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsNode(pObj) );
+    // go through the branches
+    RetValue1 = Dar_BalanceCone_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild0(pObj) ), vSuper );
+    RetValue2 = Dar_BalanceCone_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild1(pObj) ), vSuper );
+    if ( RetValue1 == -1 || RetValue2 == -1 )
+        return -1;
+    // return 1 if at least one branch has a duplicate
+    return RetValue1 || RetValue2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Dar_BalanceCone( Aig_Obj_t * pObj, Vec_Vec_t * vStore, int Level )
+{
+    Vec_Ptr_t * vNodes;
+    int RetValue, i;
+    assert( !Aig_IsComplement(pObj) );
+    // extend the storage
+    if ( Vec_VecSize( vStore ) <= Level )
+        Vec_VecPush( vStore, Level, 0 );
+    // get the temporary array of nodes
+    vNodes = Vec_VecEntry( vStore, Level );
+    Vec_PtrClear( vNodes );
+    // collect the nodes in the implication supergate
+    RetValue = Dar_BalanceCone_rec( pObj, pObj, vNodes );
+    assert( vNodes->nSize > 1 );
+    // unmark the visited nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Aig_Regular(pObj)->fMarkB = 0;
+    // if we found the node and its complement in the same implication supergate, 
+    // return empty set of nodes (meaning that we should use constant-0 node)
+    if ( RetValue == -1 )
+        vNodes->nSize = 0;
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Procedure used for sorting the nodes in decreasing order of levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Aig_NodeCompareLevelsDecrease( Aig_Obj_t ** pp1, Aig_Obj_t ** pp2 )
+{
+    int Diff = Aig_ObjLevel(Aig_Regular(*pp1)) - Aig_ObjLevel(Aig_Regular(*pp2));
+    if ( Diff > 0 )
+        return -1;
+    if ( Diff < 0 ) 
+        return 1;
+    return 0; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Builds implication supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Dar_BalanceBuildSuper( Aig_Man_t * p, Vec_Ptr_t * vSuper, Aig_Type_t Type, int fUpdateLevel )
+{
+    Aig_Obj_t * pObj1, * pObj2;
+    int LeftBound;
+    assert( vSuper->nSize > 1 );
+    // sort the new nodes by level in the decreasing order
+    Vec_PtrSort( vSuper, Aig_NodeCompareLevelsDecrease );
+    // balance the nodes
+    while ( vSuper->nSize > 1 )
+    {
+        // find the left bound on the node to be paired
+        LeftBound = (!fUpdateLevel)? 0 : Dar_BalanceFindLeft( vSuper );
+        // find the node that can be shared (if no such node, randomize choice)
+        Dar_BalancePermute( p, vSuper, LeftBound, Type == AIG_OBJ_EXOR );
+        // pull out the last two nodes
+        pObj1 = Vec_PtrPop(vSuper);
+        pObj2 = Vec_PtrPop(vSuper);
+        Dar_BalancePushUniqueOrderByLevel( vSuper, Aig_Oper(p, pObj1, pObj2, Type) );
+    }
+    return Vec_PtrEntry(vSuper, 0);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finds the left bound on the next candidate to be paired.]
+
+  Description [The nodes in the array are in the decreasing order of levels. 
+  The last node in the array has the smallest level. By default it would be paired 
+  with the next node on the left. However, it may be possible to pair it with some
+  other node on the left, in such a way that the new node is shared. This procedure
+  finds the index of the left-most node, which can be paired with the last node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_BalanceFindLeft( Vec_Ptr_t * vSuper )
+{
+    Aig_Obj_t * pObjRight, * pObjLeft;
+    int Current;
+    // if two or less nodes, pair with the first
+    if ( Vec_PtrSize(vSuper) < 3 )
+        return 0;
+    // set the pointer to the one before the last
+    Current = Vec_PtrSize(vSuper) - 2;
+    pObjRight = Vec_PtrEntry( vSuper, Current );
+    // go through the nodes to the left of this one
+    for ( Current--; Current >= 0; Current-- )
+    {
+        // get the next node on the left
+        pObjLeft = Vec_PtrEntry( vSuper, Current );
+        // if the level of this node is different, quit the loop
+        if ( Aig_ObjLevel(Aig_Regular(pObjLeft)) != Aig_ObjLevel(Aig_Regular(pObjRight)) )
+            break;
+    }
+    Current++;    
+    // get the node, for which the equality holds
+    pObjLeft = Vec_PtrEntry( vSuper, Current );
+    assert( Aig_ObjLevel(Aig_Regular(pObjLeft)) == Aig_ObjLevel(Aig_Regular(pObjRight)) );
+    return Current;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Moves closer to the end the node that is best for sharing.]
+
+  Description [If there is no node with sharing, randomly chooses one of 
+  the legal nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_BalancePermute( Aig_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor )
+{
+    Aig_Obj_t * pObj1, * pObj2, * pObj3, * pGhost;
+    int RightBound, i;
+    // get the right bound
+    RightBound = Vec_PtrSize(vSuper) - 2;
+    assert( LeftBound <= RightBound );
+    if ( LeftBound == RightBound )
+        return;
+    // get the two last nodes
+    pObj1 = Vec_PtrEntry( vSuper, RightBound + 1 );
+    pObj2 = Vec_PtrEntry( vSuper, RightBound     );
+    if ( Aig_Regular(pObj1) == p->pConst1 || Aig_Regular(pObj2) == p->pConst1 )
+        return;
+    // find the first node that can be shared
+    for ( i = RightBound; i >= LeftBound; i-- )
+    {
+        pObj3 = Vec_PtrEntry( vSuper, i );
+        if ( Aig_Regular(pObj3) == p->pConst1 )
+        {
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+        pGhost = Aig_ObjCreateGhost( p, pObj1, pObj3, fExor? AIG_OBJ_EXOR : AIG_OBJ_AND );
+        if ( Aig_TableLookup( p, pGhost ) )
+        {
+            if ( pObj3 == pObj2 )
+                return;
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+    }
+/*
+    // we did not find the node to share, randomize choice
+    {
+        int Choice = rand() % (RightBound - LeftBound + 1);
+        pObj3 = Vec_PtrEntry( vSuper, LeftBound + Choice );
+        if ( pObj3 == pObj2 )
+            return;
+        Vec_PtrWriteEntry( vSuper, LeftBound + Choice, pObj2 );
+        Vec_PtrWriteEntry( vSuper, RightBound,         pObj3 );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts a new node in the order by levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_BalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pObj1, * pObj2;
+    int i;
+    if ( Vec_PtrPushUnique(vStore, pObj) )
+        return;
+    // find the p of the node
+    for ( i = vStore->nSize-1; i > 0; i-- )
+    {
+        pObj1 = vStore->pArray[i  ];
+        pObj2 = vStore->pArray[i-1];
+        if ( Aig_ObjLevel(Aig_Regular(pObj1)) <= Aig_ObjLevel(Aig_Regular(pObj2)) )
+            break;
+        vStore->pArray[i  ] = pObj2;
+        vStore->pArray[i-1] = pObj1;
+    }
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darCore.c b/abc70930/src/aig/dar/darCore.c
new file mode 100644
index 00000000..f4041dd1
--- /dev/null
+++ b/abc70930/src/aig/dar/darCore.c
@@ -0,0 +1,244 @@
+/**CFile****************************************************************
+
+  FileName    [darCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Core of the rewriting package.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darCore.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the structure with default assignment of parameters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManDefaultRwrParams( Dar_RwrPar_t * pPars )
+{
+    memset( pPars, 0, sizeof(Dar_RwrPar_t) );
+    pPars->nCutsMax     =  8; // 8
+    pPars->nSubgMax     =  5; // 5 is a "magic number"
+    pPars->fFanout      =  1;
+    pPars->fUpdateLevel =  0;
+    pPars->fUseZeros    =  0;
+    pPars->fVerbose     =  0;
+    pPars->fVeryVerbose =  0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_ManRewrite( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
+{
+    Dar_Man_t * p;
+//    Bar_Progress_t * pProgress;
+    Dar_Cut_t * pCut;
+    Aig_Obj_t * pObj, * pObjNew;
+    int i, k, nNodesOld, nNodeBefore, nNodeAfter, Required;
+    int clk = 0, clkStart;
+    // prepare the library
+    Dar_LibPrepare( pPars->nSubgMax ); 
+    // create rewriting manager
+    p = Dar_ManStart( pAig, pPars );
+    // remove dangling nodes
+    Aig_ManCleanup( pAig );
+    // if updating levels is requested, start fanout and timing
+    if ( p->pPars->fFanout )
+        Aig_ManFanoutStart( pAig );
+    if ( p->pPars->fUpdateLevel )
+        Aig_ManStartReverseLevels( pAig, 0 );
+    // set elementary cuts for the PIs
+    Dar_ManCutsStart( p );
+    // resynthesize each node once
+    clkStart = clock();
+    p->nNodesInit = Aig_ManNodeNum(pAig);
+    nNodesOld = Vec_PtrSize( pAig->vObjs );
+
+//    pProgress = Bar_ProgressStart( stdout, nNodesOld );
+    Aig_ManForEachObj( pAig, pObj, i )
+//    pProgress = Bar_ProgressStart( stdout, 100 );
+//    Aig_ManOrderStart( pAig );
+//    Aig_ManForEachNodeInOrder( pAig, pObj )
+    {
+//        Bar_ProgressUpdate( pProgress, 100*pAig->nAndPrev/pAig->nAndTotal, NULL );
+
+//        Bar_ProgressUpdate( pProgress, i, NULL );
+        if ( !Aig_ObjIsNode(pObj) )
+            continue;
+        if ( i > nNodesOld )
+            break;
+
+        // consider freeing the cuts
+//        if ( (i & 0xFFF) == 0 && Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20) > 100 )
+//            Dar_ManCutsStart( p );
+
+        // compute cuts for the node
+        p->nNodesTried++;
+clk = clock();
+        Dar_ObjComputeCuts_rec( p, pObj );
+p->timeCuts += clock() - clk;
+
+        // check if there is a trivial cut
+        Dar_ObjForEachCut( pObj, pCut, k )
+            if ( pCut->nLeaves == 0 || (pCut->nLeaves == 1 && pCut->pLeaves[0] != pObj->Id && Aig_ManObj(p->pAig, pCut->pLeaves[0])) )
+                break;
+        if ( k < (int)pObj->nCuts )
+        {
+            assert( pCut->nLeaves < 2 );
+            if ( pCut->nLeaves == 0 ) // replace by constant
+            {
+                assert( pCut->uTruth == 0 || pCut->uTruth == 0xFFFF );
+                pObjNew = Aig_NotCond( Aig_ManConst1(p->pAig), pCut->uTruth==0 );
+            }
+            else
+            {
+                assert( pCut->uTruth == 0xAAAA || pCut->uTruth == 0x5555 );
+                pObjNew = Aig_NotCond( Aig_ManObj(p->pAig, pCut->pLeaves[0]), pCut->uTruth==0x5555 );
+            }
+            // remove the old cuts
+            Dar_ObjSetCuts( pObj, NULL );
+            // replace the node
+            Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
+            continue;
+        }
+
+        // evaluate the cuts
+        p->GainBest = -1;
+        Required = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : AIG_INFINITY;
+        Dar_ObjForEachCut( pObj, pCut, k )
+            Dar_LibEval( p, pObj, pCut, Required );
+        // check the best gain
+        if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
+        {
+//            Aig_ObjOrderAdvance( pAig );
+            continue;
+        }
+        // remove the old cuts
+        Dar_ObjSetCuts( pObj, NULL );
+        // if we end up here, a rewriting step is accepted
+        nNodeBefore = Aig_ManNodeNum( pAig );
+        pObjNew = Dar_LibBuildBest( p ); // pObjNew can be complemented!
+        pObjNew = Aig_NotCond( pObjNew, Aig_ObjPhaseReal(pObjNew) ^ pObj->fPhase );
+        assert( (int)Aig_Regular(pObjNew)->Level <= Required );
+        // replace the node
+        Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
+        // compare the gains
+        nNodeAfter = Aig_ManNodeNum( pAig );
+        assert( p->GainBest <= nNodeBefore - nNodeAfter );
+        // count gains of this class
+        p->ClassGains[p->ClassBest] += nNodeBefore - nNodeAfter;
+    }
+//    Aig_ManOrderStop( pAig );
+
+p->timeTotal = clock() - clkStart;
+p->timeOther = p->timeTotal - p->timeCuts - p->timeEval;
+
+//    Bar_ProgressStop( pProgress );
+    p->nCutMemUsed = Aig_MmFixedReadMemUsage(p->pMemCuts)/(1<<20);
+    Dar_ManCutsFree( p );
+    // put the nodes into the DFS order and reassign their IDs
+//    Aig_NtkReassignIds( p );
+    // fix the levels
+//    Aig_ManVerifyLevel( pAig );
+    if ( p->pPars->fFanout )
+        Aig_ManFanoutStop( pAig );
+    if ( p->pPars->fUpdateLevel )
+    {
+//        Aig_ManVerifyReverseLevel( pAig );
+        Aig_ManStopReverseLevels( pAig );
+    }
+    // stop the rewriting manager
+    Dar_ManStop( p );
+    Aig_ManCheckPhase( pAig );
+    // check
+    if ( !Aig_ManCheck( pAig ) )
+    {
+        printf( "Aig_ManRewrite: The network check has failed.\n" );
+        return 0;
+    }
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_MmFixed_t * Dar_ManComputeCuts( Aig_Man_t * pAig, int nCutsMax )
+{
+    Dar_Man_t * p;
+    Dar_RwrPar_t Pars, * pPars = &Pars; 
+    Aig_Obj_t * pObj;
+    Aig_MmFixed_t * pMemCuts;
+    int i, nNodes;
+    // remove dangling nodes
+    if ( (nNodes = Aig_ManCleanup( pAig )) )
+    {
+//        printf( "Removing %d nodes.\n", nNodes );
+    }
+    // create default parameters
+    Dar_ManDefaultRwrParams( pPars );
+    pPars->nCutsMax = nCutsMax;
+    // create rewriting manager
+    p = Dar_ManStart( pAig, pPars );
+    // set elementary cuts for the PIs
+    Dar_ManCutsStart( p );
+    // compute cuts for each nodes in the topological order
+    Aig_ManForEachNode( pAig, pObj, i )
+        Dar_ObjComputeCuts( p, pObj );
+    // free the cuts
+    pMemCuts = p->pMemCuts;
+    p->pMemCuts = NULL;
+//    Dar_ManCutsFree( p );
+    // stop the rewriting manager
+    Dar_ManStop( p );
+    return pMemCuts;
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darCut.c b/abc70930/src/aig/dar/darCut.c
new file mode 100644
index 00000000..08bd77a9
--- /dev/null
+++ b/abc70930/src/aig/dar/darCut.c
@@ -0,0 +1,698 @@
+/**CFile****************************************************************
+
+  FileName    [darCut.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Computation of 4-input cuts.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darCut.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of 1s in the machine word.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_WordCountOnes( unsigned uWord )
+{
+    uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
+    uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
+    uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
+    uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
+    return  (uWord & 0x0000FFFF) + (uWord>>16);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the cost of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutFindValue( Dar_Man_t * p, Dar_Cut_t * pCut )
+{
+    Aig_Obj_t * pLeaf;
+    int i, Value, nOnes;
+    assert( pCut->fUsed );
+    Value = 0;
+    nOnes = 0;
+    Dar_CutForEachLeaf( p->pAig, pCut, pLeaf, i )
+    {
+        if ( pLeaf == NULL )
+            return 0;
+        assert( pLeaf != NULL );
+        Value += pLeaf->nRefs;
+        nOnes += (pLeaf->nRefs == 1);
+    }
+    if ( pCut->nLeaves < 2 )
+        return 1001;
+//    Value = Value * 100 / pCut->nLeaves;
+    if ( Value > 1000 )
+        Value = 1000;
+    if ( nOnes > 3 )
+        Value = 5 - nOnes;
+    return Value;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the next free cut to use.]
+
+  Description [Uses the cut with the smallest value.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dar_Cut_t * Dar_CutFindFree( Dar_Man_t * p, Aig_Obj_t * pObj )
+{
+    Dar_Cut_t * pCut, * pCutMax;
+    int i;
+    pCutMax = NULL;
+    Dar_ObjForEachCutAll( pObj, pCut, i )
+    {
+        if ( pCut->fUsed == 0 )
+            return pCut;
+        if ( pCut->nLeaves < 3 )
+            continue;
+        if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
+            pCutMax = pCut;
+    }
+    if ( pCutMax == NULL )
+    {
+        Dar_ObjForEachCutAll( pObj, pCut, i )
+        {
+            if ( pCut->nLeaves < 2 )
+                continue;
+            if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
+                pCutMax = pCut;
+        }
+    }
+    if ( pCutMax == NULL )
+    {
+        Dar_ObjForEachCutAll( pObj, pCut, i )
+        {
+            if ( pCutMax == NULL || pCutMax->Value > pCut->Value )
+                pCutMax = pCut;
+        }
+    }
+    assert( pCutMax != NULL );
+    pCutMax->fUsed = 0;
+    return pCutMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pDom is contained in pCut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutCheckDominance( Dar_Cut_t * pDom, Dar_Cut_t * pCut )
+{
+    int i, k;
+    assert( pDom->fUsed && pCut->fUsed );
+    for ( i = 0; i < (int)pDom->nLeaves; i++ )
+    {
+        for ( k = 0; k < (int)pCut->nLeaves; k++ )
+            if ( pDom->pLeaves[i] == pCut->pLeaves[k] )
+                break;
+        if ( k == (int)pCut->nLeaves ) // node i in pDom is not contained in pCut
+            return 0;
+    }
+    // every node in pDom is contained in pCut
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the cut is contained.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutFilter( Aig_Obj_t * pObj, Dar_Cut_t * pCut )
+{ 
+    Dar_Cut_t * pTemp;
+    int i;
+    assert( pCut->fUsed );
+    // go through the cuts of the node
+    Dar_ObjForEachCut( pObj, pTemp, i )
+    {
+        if ( pTemp == pCut )
+            continue;
+        if ( pTemp->nLeaves > pCut->nLeaves )
+        {
+            // skip the non-contained cuts
+            if ( (pTemp->uSign & pCut->uSign) != pCut->uSign )
+                continue;
+            // check containment seriously
+            if ( Dar_CutCheckDominance( pCut, pTemp ) )
+            {
+                // remove contained cut
+                pTemp->fUsed = 0;
+            }
+         }
+        else
+        {
+            // skip the non-contained cuts
+            if ( (pTemp->uSign & pCut->uSign) != pTemp->uSign )
+                continue;
+            // check containment seriously
+            if ( Dar_CutCheckDominance( pTemp, pCut ) )
+            {
+                // remove the given cut
+                pCut->fUsed = 0;
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two cuts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutMergeOrdered( Dar_Cut_t * pC, Dar_Cut_t * pC0, Dar_Cut_t * pC1 )
+{ 
+    int i, k, c;
+    assert( pC0->nLeaves >= pC1->nLeaves );
+
+    // the case of the largest cut sizes
+    if ( pC0->nLeaves == 4 && pC1->nLeaves == 4 )
+    {
+        if ( pC0->uSign != pC1->uSign )
+            return 0;
+        for ( i = 0; i < (int)pC0->nLeaves; i++ )
+            if ( pC0->pLeaves[i] != pC1->pLeaves[i] )
+                return 0;
+        for ( i = 0; i < (int)pC0->nLeaves; i++ )
+            pC->pLeaves[i] = pC0->pLeaves[i];
+        pC->nLeaves = pC0->nLeaves;
+        return 1;
+    }
+
+    // the case when one of the cuts is the largest
+    if ( pC0->nLeaves == 4 )
+    {
+        if ( (pC0->uSign & pC1->uSign) != pC1->uSign )
+            return 0;
+        for ( i = 0; i < (int)pC1->nLeaves; i++ )
+        {
+            for ( k = (int)pC0->nLeaves - 1; k >= 0; k-- )
+                if ( pC0->pLeaves[k] == pC1->pLeaves[i] )
+                    break;
+            if ( k == -1 ) // did not find
+                return 0;
+        }
+        for ( i = 0; i < (int)pC0->nLeaves; i++ )
+            pC->pLeaves[i] = pC0->pLeaves[i];
+        pC->nLeaves = pC0->nLeaves;
+        return 1;
+    }
+
+    // compare two cuts with different numbers
+    i = k = 0;
+    for ( c = 0; c < 4; c++ )
+    {
+        if ( k == (int)pC1->nLeaves )
+        {
+            if ( i == (int)pC0->nLeaves )
+            {
+                pC->nLeaves = c;
+                return 1;
+            }
+            pC->pLeaves[c] = pC0->pLeaves[i++];
+            continue;
+        }
+        if ( i == (int)pC0->nLeaves )
+        {
+            if ( k == (int)pC1->nLeaves )
+            {
+                pC->nLeaves = c;
+                return 1;
+            }
+            pC->pLeaves[c] = pC1->pLeaves[k++];
+            continue;
+        }
+        if ( pC0->pLeaves[i] < pC1->pLeaves[k] )
+        {
+            pC->pLeaves[c] = pC0->pLeaves[i++];
+            continue;
+        }
+        if ( pC0->pLeaves[i] > pC1->pLeaves[k] )
+        {
+            pC->pLeaves[c] = pC1->pLeaves[k++];
+            continue;
+        }
+        pC->pLeaves[c] = pC0->pLeaves[i++]; 
+        k++;
+    }
+    if ( i < (int)pC0->nLeaves || k < (int)pC1->nLeaves )
+        return 0;
+    pC->nLeaves = c;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the object for FPGA mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutMerge( Dar_Cut_t * pCut, Dar_Cut_t * pCut0, Dar_Cut_t * pCut1 )
+{ 
+    assert( !pCut->fUsed );
+    // merge the nodes
+    if ( pCut0->nLeaves <= pCut1->nLeaves )
+    {
+        if ( !Dar_CutMergeOrdered( pCut, pCut1, pCut0 ) )
+            return 0;
+    }
+    else
+    {
+        if ( !Dar_CutMergeOrdered( pCut, pCut0, pCut1 ) )
+            return 0;
+    }
+    pCut->uSign = pCut0->uSign | pCut1->uSign;
+    pCut->fUsed = 1;
+    return 1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the stretching phase of the cut w.r.t. the merged cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dar_CutTruthPhase( Dar_Cut_t * pCut, Dar_Cut_t * pCut1 )
+{
+    unsigned uPhase = 0;
+    int i, k;
+    for ( i = k = 0; i < (int)pCut->nLeaves; i++ )
+    {
+        if ( k == (int)pCut1->nLeaves )
+            break;
+        if ( pCut->pLeaves[i] < pCut1->pLeaves[k] )
+            continue;
+        assert( pCut->pLeaves[i] == pCut1->pLeaves[k] );
+        uPhase |= (1 << i);
+        k++;
+    }
+    return uPhase;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Swaps two advancent variables of the truth table.]
+
+  Description [Swaps variable iVar and iVar+1.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dar_CutTruthSwapAdjacentVars( unsigned uTruth, int iVar )
+{
+    assert( iVar >= 0 && iVar <= 2 );
+    if ( iVar == 0 )
+        return (uTruth & 0x99999999) | ((uTruth & 0x22222222) << 1) | ((uTruth & 0x44444444) >> 1);
+    if ( iVar == 1 )
+        return (uTruth & 0xC3C3C3C3) | ((uTruth & 0x0C0C0C0C) << 2) | ((uTruth & 0x30303030) >> 2);
+    if ( iVar == 2 )
+        return (uTruth & 0xF00FF00F) | ((uTruth & 0x00F000F0) << 4) | ((uTruth & 0x0F000F00) >> 4);
+    assert( 0 );
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the truth table according to the phase.]
+
+  Description [The input and output truth tables are in pIn/pOut. The current number
+  of variables is nVars. The total number of variables in nVarsAll. The last argument
+  (Phase) contains shows where the variables should go.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dar_CutTruthStretch( unsigned uTruth, int nVars, unsigned Phase )
+{
+    int i, k, Var = nVars - 1;
+    for ( i = 3; i >= 0; i-- )
+        if ( Phase & (1 << i) )
+        {
+            for ( k = Var; k < i; k++ )
+                uTruth = Dar_CutTruthSwapAdjacentVars( uTruth, k );
+            Var--;
+        }
+    assert( Var == -1 );
+    return uTruth;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Shrinks the truth table according to the phase.]
+
+  Description [The input and output truth tables are in pIn/pOut. The current number
+  of variables is nVars. The total number of variables in nVarsAll. The last argument
+  (Phase) contains shows what variables should remain.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dar_CutTruthShrink( unsigned uTruth, int nVars, unsigned Phase )
+{
+    int i, k, Var = 0;
+    for ( i = 0; i < 4; i++ )
+        if ( Phase & (1 << i) )
+        {
+            for ( k = i-1; k >= Var; k-- )
+                uTruth = Dar_CutTruthSwapAdjacentVars( uTruth, k );
+            Var++;
+        }
+    return uTruth;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs truth table computation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dar_CutTruth( Dar_Cut_t * pCut, Dar_Cut_t * pCut0, Dar_Cut_t * pCut1, int fCompl0, int fCompl1 )
+{
+    unsigned uTruth0 = fCompl0 ? ~pCut0->uTruth : pCut0->uTruth;
+    unsigned uTruth1 = fCompl1 ? ~pCut1->uTruth : pCut1->uTruth;
+    uTruth0 = Dar_CutTruthStretch( uTruth0, pCut0->nLeaves, Dar_CutTruthPhase(pCut, pCut0) );
+    uTruth1 = Dar_CutTruthStretch( uTruth1, pCut1->nLeaves, Dar_CutTruthPhase(pCut, pCut1) );
+    return uTruth0 & uTruth1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Minimize support of the cut.]
+
+  Description [Returns 1 if the node's support has changed]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dar_CutSuppMinimize( Dar_Cut_t * pCut )
+{
+    unsigned uMasks[4][2] = {
+        { 0x5555, 0xAAAA },
+        { 0x3333, 0xCCCC },
+        { 0x0F0F, 0xF0F0 },
+        { 0x00FF, 0xFF00 }
+    };
+    unsigned uPhase = 0, uTruth = 0xFFFF & pCut->uTruth;
+    int i, k, nLeaves;
+    assert( pCut->fUsed );
+    // compute the truth support of the cut's function
+    nLeaves = pCut->nLeaves;
+    for ( i = 0; i < (int)pCut->nLeaves; i++ )
+        if ( (uTruth & uMasks[i][0]) == ((uTruth & uMasks[i][1]) >> (1 << i)) )
+            nLeaves--;
+        else
+            uPhase |= (1 << i);
+    if ( nLeaves == (int)pCut->nLeaves )
+        return 0;
+    // shrink the truth table
+    uTruth = Dar_CutTruthShrink( uTruth, pCut->nLeaves, uPhase );
+    pCut->uTruth = 0xFFFF & uTruth;
+    // update leaves and signature
+    pCut->uSign = 0;
+    for ( i = k = 0; i < (int)pCut->nLeaves; i++ )
+    {
+        if ( !(uPhase & (1 << i)) )
+            continue;    
+        pCut->pLeaves[k++] = pCut->pLeaves[i];
+        pCut->uSign |= Aig_ObjCutSign( pCut->pLeaves[i] );
+    }
+    assert( k == nLeaves );
+    pCut->nLeaves = nLeaves;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManCutsFree( Dar_Man_t * p )
+{
+    if ( p->pMemCuts == NULL )
+        return;
+    Aig_MmFixedStop( p->pMemCuts, 0 );
+    p->pMemCuts = NULL;
+//    Aig_ManCleanData( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Cut_t * Dar_ObjPrepareCuts( Dar_Man_t * p, Aig_Obj_t * pObj )
+{
+    Dar_Cut_t * pCutSet, * pCut;
+    int i;
+    assert( Dar_ObjCuts(pObj) == NULL );
+    pObj->nCuts = p->pPars->nCutsMax;
+    // create the cutset of the node
+    pCutSet = (Dar_Cut_t *)Aig_MmFixedEntryFetch( p->pMemCuts );
+    Dar_ObjSetCuts( pObj, pCutSet );
+    Dar_ObjForEachCut( pObj, pCut, i )
+        pCut->fUsed = 0;
+    // add unit cut if needed
+    pCut = pCutSet;
+    pCut->fUsed = 1;
+    if ( Aig_ObjIsConst1(pObj) )
+    {
+        pCut->nLeaves = 0;
+        pCut->uSign = 0;
+        pCut->uTruth = 0xFFFF;
+    }
+    else
+    {
+        pCut->nLeaves = 1;
+        pCut->pLeaves[0] = pObj->Id;
+        pCut->uSign = Aig_ObjCutSign( pObj->Id );
+        pCut->uTruth = 0xAAAA;
+    }
+    pCut->Value = Dar_CutFindValue( p, pCut );
+    return pCutSet;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManCutsStart( Dar_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManCleanData( p->pAig );
+    Aig_MmFixedRestart( p->pMemCuts );
+    Dar_ObjPrepareCuts( p, Aig_ManConst1(p->pAig) );
+    Aig_ManForEachPi( p->pAig, pObj, i )
+        Dar_ObjPrepareCuts( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Cut_t * Dar_ObjComputeCuts( Dar_Man_t * p, Aig_Obj_t * pObj )
+{
+    Aig_Obj_t * pFanin0 = Aig_ObjReal_rec( Aig_ObjChild0(pObj) );
+    Aig_Obj_t * pFanin1 = Aig_ObjReal_rec( Aig_ObjChild1(pObj) );
+    Aig_Obj_t * pFaninR0 = Aig_Regular(pFanin0);
+    Aig_Obj_t * pFaninR1 = Aig_Regular(pFanin1);
+    Dar_Cut_t * pCutSet, * pCut0, * pCut1, * pCut;
+    int i, k, RetValue;
+
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsNode(pObj) );
+    assert( Dar_ObjCuts(pObj) == NULL );
+    assert( Dar_ObjCuts(pFaninR0) != NULL );
+    assert( Dar_ObjCuts(pFaninR1) != NULL );
+
+    // set up the first cut
+    pCutSet = Dar_ObjPrepareCuts( p, pObj );
+    // make sure fanins cuts are computed
+    Dar_ObjForEachCut( pFaninR0, pCut0, i )
+    Dar_ObjForEachCut( pFaninR1, pCut1, k )
+    {
+        p->nCutsAll++;
+        // make sure K-feasible cut exists
+        if ( Dar_WordCountOnes(pCut0->uSign | pCut1->uSign) > 4 )
+            continue;
+        // get the next cut of this node
+        pCut = Dar_CutFindFree( p, pObj );
+        // create the new cut
+        if ( !Dar_CutMerge( pCut, pCut0, pCut1 ) )
+        {
+            assert( !pCut->fUsed );
+            continue;
+        }
+        p->nCutsTried++;
+        // check dominance
+        if ( Dar_CutFilter( pObj, pCut ) )
+        {
+            assert( !pCut->fUsed );
+            continue;
+        }
+        // compute truth table
+        pCut->uTruth = 0xFFFF & Dar_CutTruth( pCut, pCut0, pCut1, Aig_IsComplement(pFanin0), Aig_IsComplement(pFanin1) );
+
+        // minimize support of the cut
+        if ( Dar_CutSuppMinimize( pCut ) )
+        {
+            RetValue = Dar_CutFilter( pObj, pCut );
+            assert( !RetValue );
+        }
+
+        // assign the value of the cut
+        pCut->Value = Dar_CutFindValue( p, pCut );
+        // if the cut contains removed node, do not use it
+        if ( pCut->Value == 0 )
+        {
+            p->nCutsSkipped++;
+            pCut->fUsed = 0;
+        }
+        else if ( pCut->nLeaves < 2 )
+            return pCutSet;
+    }
+    // count the number of nontrivial cuts cuts
+    Dar_ObjForEachCut( pObj, pCut, i )
+        p->nCutsUsed += pCut->fUsed;
+    // discount trivial cut
+    p->nCutsUsed--;
+    return pCutSet;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Cut_t * Dar_ObjComputeCuts_rec( Dar_Man_t * p, Aig_Obj_t * pObj )
+{
+    if ( Dar_ObjCuts(pObj) )
+        return Dar_ObjCuts(pObj);
+    if ( Aig_ObjIsBuf(pObj) )
+        return Dar_ObjComputeCuts_rec( p, Aig_ObjFanin0(pObj) );
+    Dar_ObjComputeCuts_rec( p, Aig_ObjFanin0(pObj) );
+    Dar_ObjComputeCuts_rec( p, Aig_ObjFanin1(pObj) );
+    return Dar_ObjComputeCuts( p, pObj );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darData.c b/abc70930/src/aig/dar/darData.c
new file mode 100644
index 00000000..cb403b8a
--- /dev/null
+++ b/abc70930/src/aig/dar/darData.c
@@ -0,0 +1,11287 @@
+/**CFile****************************************************************
+
+  FileName    [dar_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Storage for AIG subgraph data.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: dar_.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+const int s_nDataSize1 = 2*43906;
+unsigned int s_Data1[2*43906] = {
+    4,    6,    5,    7,    9,   11,    5,    6,    4,    7,   15,   17,
+    2,    8,    4,   21,    3,   10,    5,   25,    7,   25,    9,   25,
+    2,   10,    7,   33,    9,   33,    2,   14,    5,   39,    6,   39,
+   17,   39,    3,   16,    7,   47,   33,   47,    2,   16,    4,   53,
+    7,   53,    3,   14,    5,   59,   17,   59,   53,   59,    3,   11,
+    7,   67,    4,   68,    5,   66,    6,   73,   33,   67,    7,   76,
+    5,   77,    9,   77,    9,   66,   33,   85,    3,    9,    4,   88,
+    7,   91,   88,   93,    6,   88,   21,   89,   11,   89,   21,  100,
+   25,  101,   11,   88,    7,  107,   33,  107,    2,   11,    5,  113,
+    7,  112,   30,  113,   25,  113,    5,  120,    7,  121,    9,  120,
+    9,  113,   25,  128,   21,  129,    9,  112,    2,    9,    6,  137,
+    5,  138,   11,  136,    3,   17,    7,  144,  113,  145,   15,  144,
+  113,  151,    3,   15,    6,  155,    4,  156,   17,  154,  113,  161,
+    2,   17,    7,  165,    5,  166,  155,  165,   15,  164,    2,   15,
+    6,  174,   17,  174,    3,   13,  113,  181,  135,  181,  143,  181,
+    2,   12,    9,  189,  181,  189,    9,  192,    2,   13,   85,  197,
+  107,  197,    3,   12,    7,  203,   11,  203,   33,  203,  197,  203,
+    9,  211,    3,   19,    7,  215,   33,  215,  173,  215,  179,  215,
+    2,   18,  215,  225,    2,   19,  151,  229,  161,  229,    3,   18,
+  113,  235,  229,  235,    2,    4,   25,  241,    9,  241,   15,  241,
+   11,  241,    6,  240,    7,  240,   59,  253,    7,  241,    9,  257,
+    6,  241,  253,  261,    3,    5,  251,  265,    6,  266,  241,  269,
+  253,  265,    7,  272,    7,  273,  241,  277,   53,  265,    7,  280,
+  248,  265,    9,  285,   11,  265,  241,  288,    9,  291,   17,  265,
+    9,  265,  257,  265,   25,  299,  251,  298,    7,  264,    3,  305,
+    5,  305,  128,  305,  101,  305,  299,  305,  241,  305,    7,  317,
+  265,  319,    9,  305,  113,  322,  113,  305,    9,  326,    6,  264,
+  241,  331,   17,  331,   53,  331,  253,  331,    7,  265,   59,  341,
+  241,  343,  331,  341,  241,  346,  241,  347,   15,  341,  113,  353,
+  241,  340,    7,  357,  265,  357,   59,  357,  331,  357,  256,  265,
+    7,  367,   59,  367,  331,  367,    6,  265,    5,  375,  242,  375,
+  316,  375,   25,  375,  241,  382,  305,  375,  241,  386,  241,  387,
+   11,  375,  241,  375,  265,  394,    7,  397,   25,  394,  305,  394,
+  251,  395,  257,  375,  241,  374,  260,  265,  241,  265,  251,  413,
+  331,  413,  261,  413,  375,  413,  257,  413,   19,  413,   12,  413,
+   11,  413,    9,  428,    9,  413,   11,  433,   11,  432,   15,  413,
+   11,  412,    9,  441,    7,  413,  241,  445,  265,  445,  375,  445,
+  409,  445,  411,  445,    6,  412,  241,  457,  445,  457,  241,  460,
+    6,  413,  357,  465,  367,  465,    7,  412,  265,  471,   59,  471,
+  331,  471,  465,  471,  241,  479,    2,    6,  353,  483,  322,  483,
+   30,  483,   25,  483,    9,  490,  305,  483,    9,  494,   19,  483,
+  413,  483,   12,  483,  244,  483,  241,  483,    9,  506,    9,  483,
+  305,  510,   25,  510,   11,  510,  241,  510,  257,  510,  247,  483,
+   11,  483,    2,  524,    4,  527,    5,  524,    3,  531,    9,  524,
+  258,  483,  151,  483,  257,  483,    9,  540,  155,  483,   17,  545,
+  235,  483,  181,  483,  161,  483,    4,  482,    2,  555,    5,  482,
+    2,  559,    6,  559,   17,  559,    5,  483,    2,  567,    6,  566,
+  241,  567,  483,  573,    9,  573,    9,  567,    4,  483,    6,  581,
+    3,  582,    3,    7,  289,  587,  510,  587,   11,  591,   11,  590,
+  516,  587,  413,  587,  483,  598,  498,  587,  500,  587,   19,  587,
+  483,  606,  502,  587,   12,  587,  483,  612,  534,  587,  524,  587,
+    9,  618,  288,  587,  305,  623,   25,  623,   11,  587,  265,  629,
+  331,  631,  510,  628,    9,  628,  483,  636,  483,  628,    9,  640,
+  265,  628,  305,  645,   25,  645,  375,  628,  265,  587,   11,  653,
+   33,  655,   11,  652,   25,  659,  305,  659,  295,  587,  241,  587,
+    9,  587,    4,  668,    2,  671,    3,  668,    5,  675,  524,  668,
+  483,  668,   11,  681,   11,  680,   11,  668,  483,  686,  392,  587,
+  165,  587,  375,  587,   17,  695,   11,  695,   11,  694,  113,  587,
+  567,  587,  305,  705,   25,  705,  555,  704,    5,  586,    3,  713,
+    7,  713,  623,  713,  645,  713,  659,  713,  128,  713,  394,  713,
+  101,  713,  299,  713,  705,  713,  510,  713,  483,  713,    9,  736,
+    9,  713,  113,  740,  483,  740,  241,  713,  375,  746,  375,  713,
+  241,  750,  113,  713,    9,  754,    4,  586,    7,  759,  589,  759,
+   33,  759,    5,  587,    7,  767,    2,  768,   47,  767,  483,  773,
+  759,  767,  483,  777,   17,  767,  113,  781,  483,  781,  483,  766,
+   47,  787,  759,  787,   17,  787,  566,  587,   47,  795,  759,  795,
+   17,  795,    4,  587,    3,  803,    6,  805,    7,  802,  494,  803,
+  490,  803,  736,  803,   25,  803,  483,  816,  305,  803,  483,  820,
+  713,  803,  483,  824,  483,  803,  305,  828,   25,  828,  713,  828,
+  555,  829,  483,  802,  580,  587,  483,  587,  413,  842,   19,  842,
+   12,  842,   11,  843,    9,  851,    9,  842,   11,  855,   11,  854,
+   11,  842,    9,  860,    5,  843,  803,  865,    9,  865,  839,  865,
+  841,  865,    4,  842,  483,  875,  865,  875,  483,  878,    4,  843,
+  787,  883,  795,  883,    5,  842,  587,  889,   47,  889,  759,  889,
+   17,  889,  883,  889,  483,  899,    3,    4,  559,  903,   19,  903,
+   12,  903,  842,  903,  587,  903,  483,  912,  165,  912,    9,  903,
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+80519,87259,    2,87257,80501,87263,    2,87239,80497,87267,80515,87269,
+80497,87266,80519,87273,77751,80533,79962,87277,    2,87279,79971,87281,
+    2,87278,79967,87285,80070,87277,    4,87289,80083,87291,    4,87288,
+80079,87295,79968,87277,79967,87299,80080,87277,80079,87303,80498,87277,
+80519,87307,80298,87277,80319,87311,80497,87277,    2,87314,80519,87317,
+    2,87315,80501,87321,80293,87277,    4,87324,80319,87327,    4,87325,
+80301,87331,81857,87277,78453,87277,80233,87277,80445,87277, 8453,87277,
+  273,87277,84484,87277,85230,87277,84531,87277,85277,87277,21522,87277,
+ 1516,87277,38266,87277,  948,87277,20239,87277, 1477,87277,37095,87277,
+  281,87277,84473,87277, 1011,87370,85215,87277,  903,87374,80242,87277,
+80448,87277,80447,87277,  903,87382,80241,87277, 1011,87386,38057,87277,
+  903,87390,  165,87277,  903,87394,21315,87277, 1011,87398, 1505,87277,
+ 1011,87402, 1216,87276,  412,87276,  413,87277,87409,87411, 1217,87277,
+87407,87415,  413,87276, 1216,87277, 1217,87276,87421,87423,  412,87277,
+87419,87427,12377,87277,  375,87277,57522,87277,67028,87277,67800,87277,
+  510,87277,  240,87277,  265,87443,77750,87445,77751,87444,87447,87449,
+77751,87445,77750,87444,87453,87455,  264,87277,84517,87459,85263,87459,
+81749,87459,  341,87459,  264,87276,  375,87469,  241,87277,81464,87472,
+81465,87473,87475,87477,81464,87473,81465,87472,87481,87483, 1011,87277,
+84473,87486,80241,87486, 1505,87486,21315,87486,  903,87277,85215,87496,
+80447,87496,  165,87496,38057,87496,  483,87277,65869,87506,    9,87506,
+    9,87277,56555,87512,  483,87512,56555,87277,    9,87518,65869,87518,
+65869,87277,  483,87524,56555,87524,    5,87277,84185,87531, 1011,87533,
+    2,87531,80532,87536,    3,87531,85215,87541,    3,87530,87539,87545,
+85263,87545,84517,87545,81749,87545,    2,87530,87533,87555,    4,87276,
+87531,87559,    2,87561,    3,87561,    2,87560,87565,87567,    3,87560,
+87563,87571,    3,87277,85111,87575,  903,87577,87559,87575,    0,87581,
+    1,87580,87583,87585,    1,87581,    0,87580,87589,87591,    4,87575,
+80532,87594,    5,87575,84473,87599,    5,87574,87597,87603,84517,87603,
+85263,87603,81749,87603,    4,87574,87577,87613,    2,87276,85663,87617,
+85100,87617,    9,87617,84767,87622,84767,87617,    9,87626,87575,87617,
+    4,87631,    5,87631,    4,87630,87635,87637,    5,87630,87633,87641,
+    2,87277,79962,87645,79965,87647,80497,87645,80515,87651,80497,87644,
+80519,87655,79962,87644,79967,87659,87559,87645,    7,87663,    6,87662,
+87665,87667,    6,87663,    7,87662,87671,87673,    4,87645, 1011,87677,
+77751,87679,77750,87678,87681,87683,77750,87679,77751,87678,87687,87689,
+    4,87644,  265,87693,77750,87695,77751,87694,87697,87699,77751,87695,
+77750,87694,87703,87705,    3,87276,  375,87709,87645,87709,    4,87713,
+    5,87713,    4,87712,87717,87719,    5,87712,87715,87723,    4,87277,
+80070,87727,80077,87729,80293,87727,80315,87733,80293,87726,80319,87737,
+80070,87726,80079,87741,    2,87727,  903,87745,77751,87747,77750,87746,
+87749,87751,77750,87747,77751,87746,87755,87757,    2,87726,  265,87761,
+77750,87763,77751,87762,87765,87767,77751,87763,77750,87762,87771,87773,
+    5,87276,87575,87777,    7,87779,    6,87778,87781,87783,    6,87779,
+    7,87778,87787,87789,87645,87777,    0,87793,    1,87792,87795,87797,
+    1,87793,    0,87792,87801,87803,87727,87777,    2,87807,    3,87807,
+    2,87806,87811,87813,    3,87806,87809,87817
+};
+
+const int s_nDataSize2 = 24772;
+unsigned int s_Data2[24772] = {
+    3,    9,    5,    6,  119,  796,  636,  113,  449,  235,  239,  105,
+  789,   96,  439,  624,  630,  230,  111,  110,  787,  786,  628,  627,
+  116,  115,  436,  435,  227,  226,   93,   92,  792,  791,  100,   99,
+  443,  442,  633,  632,  128,  183,  234,  178,  233,   85,  762,  203,
+   32,  742,  356,  169,  152,   12,  672,  741,  127,  168,  671,  740,
+   50,  352,  149,   64,  414,  197,  276,  751,  722,  396,  275,  434,
+  721,  785,  274,  795,  720,  448,  273,  719,  474,  758,  718,  392,
+  269,  748,  715,  400,  118,  794,  635,   81,   76,  750,  747,  597,
+  595,   91,  433,  225,   74,  745,  680,  565,  268,  476,  271,  761,
+  350,  678,  345,  567,  757,  471,  470,  563,  469,  561,  551,  461,
+  465,  706,  650,  714,  261,  332,  641,  708,  676,  542,  260,  458,
+  755,  314,  325,  658,  288,  349,  760,  654,  656,  564,  562,  644,
+  552,  642,  550,  259,  252,  254,  322,  311,  329,  109,  784,  626,
+   43,  395,  182,   55,  399,  186,  104,  447,  238,   41,  389,  173,
+  175,  193,  485,  580,  579,  734,   25,  733,  528,  548,  310,  546,
+  344,  526,  308,  560,  342,  525,  556,  558,  523,  524,  522,  520,
+  307,  622,  623,  431,  618,  620,  429,  617,  305,  615,  519,  518,
+  516,  778,  304,  250,  302,  776,  216,  218,  774,  215,  301,  300,
+  514,  771,  513,  541,  298,  512,  297,  535,  321,  508,  510,  319,
+  538,  539,  533,  507,  509,  296,  146,  705,  531,  537,  317,  557,
+  341,  143,  697,  555,  544,  339,  613,  426,  217,  773,  619,  428,
+  221,  780,  611,  610,  424,  609,  769,  423,  422,  768,  213,  625,
+  783,  670,  732,  782,  578,  577,  731,  484,  387,  668,  669,  171,
+  172,  375,  191,  575,  729,  482,  446,  667,  237,  574,  728,  481,
+  398,  666,  185,  573,  727,  480,  394,  665,  181,  572,  695,  694,
+  140,  738,  372,  246,  690,  689,  136,  244,  369,  767,  212,  766,
+  702,  701,  367,  257,  700,  315,  726,  382,   59,  407,  190,   52,
+  366,  157,   65,  417,  201,   63,  413,  194,  686,  692,  243,  248,
+  699,  256,  150,  354,  365,  364,  353,  156,  685,  348,  242,  661,
+  192,  409,  376,  378,  411,  164,  569,  717,  473,  391,  660,  177,
+  189,  406,  374,  371,  405,  162,  200,  416,  363,  362,  415,  155,
+  313,  324,  361,  360,  331,  312,  328,  381,  316,  330,  359,  323,
+ 4596,24359,41366,41344, 4857,37718, 4594,24357, 4846,37706, 4678,26650,
+ 4592,24355, 4844,37704, 4591,24354, 4843,37703, 8816,41900,22056,15422,
+ 7473, 8464,42932, 8814,41898, 6804,20483,12853, 8462,42930, 8809,42808,
+21978,15306, 7385, 8456,42895, 8807,41327,21965,15246,15293, 7372, 8454,
+42893, 3212,20457,36983, 3516, 6187, 6184,20453,29352,10563,10421, 2593,
+20452, 6183, 5637, 2589, 6182, 2645, 2619, 2283,26212,20199, 2269,12513,
+ 2614, 2661,18113, 2288, 4777,35226, 4775, 4774, 4773,42536, 2198,32674,
+32753, 8833, 8780,40027,43084,39938,43445, 8548, 8831,24157,26148,31156,
+29057, 8503, 8771, 8777,24156,26147,36425,33823,40025,43073,43081,39936,
+43443,22500,18803, 8829, 8770,40023,43072,39934,43438, 8546, 8827,24155,
+26146,31154,29044, 8501, 8765,24153,26140,36424,33800,33820,40022,43066,
+39933,43435,22498,18801,43065,40020,43434,39931,18800,22493, 8764, 8499,
+26128,24151,33799,36411, 8826, 8544,26120,24146,29025,31141, 8762, 8824,
+43063,40019,43432,39929, 2287, 2286,21235,26865,13688,26627,13207,20826,
+ 2106, 2073, 4667, 4378, 1966, 4054,13206,20825, 2159, 2168,18699,39853,
+10355,39675, 2167,39852,13205,18520, 2158,39674,20824,20823,42653,42280,
+18519,10116,21390,13926, 2032,42279, 1932,42652, 2166, 2157,42651, 5184,
+42278, 5035, 2070,21389,20822, 4377,13925,13204, 5034, 5183,13924,21388,
+ 5033, 5182,39673,42650,39851,42277, 4221, 5142,18518,21387,18698,20821,
+ 4220, 4982,10115,13923,10354,13203,39850,42276,39672,42649,20820,18697,
+42648,39671,42275,39849,18517,21386, 4376, 5032,13202,10353,13922,10114,
+ 4375, 5181,20819,18696,21385,18516, 4981, 5141,42274,39848,42647,39670,
+ 5031, 5180,42646, 5140,42273, 4980, 4219,21384,20818, 4374,13921,13201,
+ 5135, 5174,39653,42257,39831,42630, 5172, 5133,24141,26112,31138,29023,
+ 5026, 4969, 4975,24140,26111,36408,33796,39651,42249,42254,39829,42628,
+21363,18686, 5139, 5179,39669,42272,39847,42645, 5178, 5138,18515,20817,
+18695,21383, 5030, 4979,10113,13200,10352,13920,39668,42271,39846,42644,
+21382,18694, 5170,24183, 5169,36516, 5168,39992, 5167,22753, 5166,21404,
+ 5165,39867, 5164,21361, 4045,26846, 4044,21215, 5162,39827, 5191,21359,
+ 5190,39825, 5189, 5160, 5159, 4043, 5157, 5024, 1891,42248, 1847,42621,
+ 4193, 4341,18472,20750, 1681,21357,10093,13145,13869, 2660, 7371, 2659,
+ 2658,13144,20749, 1846, 1890,39824,18682,39649,10344, 1872,39823,18507,
+13143, 1889,39648,20748,20747,42620,42247,10107,18506,21356,13868, 1871,
+42246, 1843,42619, 2205,26240,26211, 2200,24249,24232, 2478, 2517,36625,
+34562,31491,29570, 2507, 2558,34076,37229,29433,31635, 8704, 8600,35491,
+38460,30352,32396,28999, 8171, 8335,38314,35364,32268,30297,30134, 8698,
+ 8591,35488,38453,30345,32384,32389, 8166, 8333,38305,35357,32255,30292,
+ 2285, 7325, 1898,14098, 1896, 1895, 1894,39359,24288,41706,41800,20017,
+37217,39357,36575,18022,26236,20013,24246,39355,39925,18013,18779,20001,
+22482,39395,20196,39397,20208,40017,39923,20064,42324,12370,42658,19065,
+18776,41387,41382, 9904,21392,10687,10412,41365,41360,18055,18053,39685,
+20893,39857,18775,43056,43431,42334,18524,42660,22479,40016,39922,14502,
+15946,39376,39374,20062,20060,21649,22478,39380,39378,12368,18702,43055,
+43430,18057,39680, 9906,39855,39991,21351,22752,39816,39990,39815,22751,
+21350,39639,39814,33754,42230,28989,42602,18468,18677,24118,26056,31087,
+28988,10090,10312,10318,24117,26055,36340,33753,39637,20700,20705,39812,
+18675,42228,42600,42219,42225,18464,42598,21348,39635,39810,13101,13106,
+13844,26054,24116,33752,36339,20699,21346,26053,24115,28987,31086,42218,
+42595,36338,39633,31085,39808,39667,39845,39666,39844,39665,39843,18693,
+18692,10351,10350,18514,39842,13199,13198,10112,39664,20816,20815,10111,
+18513,42270,42643,13919,21381,13918,42269,21380,42642,39806,21403,21344,
+39866,39805,39865,21343,21402,39804,21342,21175,26830,39802,21173,26826,
+21340,39346,24061,39338,32626,39333, 9843,39332,39331, 9814,39328,15936,
+39183,11746,19744,25614,39182,39181,39180,19836,42268,11903,42641,17932,
+17931,40961,40960, 9771,21379, 9770, 9769,40959,40958,17930,17929,39663,
+20814,39841,17928,40957,40956,42267,18512,42640,19835,39179,39178,11902,
+11901,39177,39176,19834,19833,19832,19831,39175,39174,11900,18691,40955,
+40954,17927,39662, 9768,39840,39173,19830,11899,17926,40953,13197, 9767,
+40952,20813, 9766,17925,40951,11898,19829,39172,11897,42266,19828,19827,
+42639,11896,40950,21378,13917,39171,39170,39169,39168,14088, 3310, 3309,
+35263, 2276,26305, 5245, 6267, 5248, 5445,10636,10624, 5401, 7751, 5390,
+ 5674, 2548, 5410, 3350, 3931, 3971, 3960, 6123,28071,22800, 8025,27598,
+16338, 7478,22061,15427, 3847, 3840, 3822, 5835,26825,21172, 7148,26571,
+13617, 6808,20693,13100, 3469, 3729, 3618, 6021,27993,22666, 7965,27534,
+16152,16158, 7368,21963,15285,15291, 3513, 3757, 3655, 6026,28010,22688,
+ 7970,27539,16193, 7376,21969,15297, 3722, 3611,27986,22657,22659,16147,
+ 3608, 3610,25575,25569,25573,25568, 2720, 2722,23945,23941,23943,23940,
+ 3606,26233,26200, 2718,24244,24224, 3603,22654,16143, 2716,22466,15931,
+ 8720, 2547, 2499, 2498,35234, 8719,35524, 7050,35233, 6181,20028, 5622,
+20027, 5610, 7023,23939,24648,23938,24484, 5952, 7920,22462,25567,27390,
+15928,25566,27757, 5620, 7027,36388,33781,31116,29009, 5970, 7936,33795,
+36407,29022,31137, 5612, 7025,24121,24653,24129,24494, 5960, 7922,26081,
+27412,26074,27796, 5601, 7014, 6501, 5946,27753,22458, 7917,27387,15926,
+ 4317, 7284,21850,15156, 5825, 5940, 5824, 5794, 7123, 6732, 6038,28015,
+22709, 7982,27551,16225, 7395,21983,15311, 8718, 5673, 7049, 8717,35523,
+23937,21560,14272,15352,40871,22739,16272,23936,22733,16263,14776,40870,
+21558,14265,23935,21474,14087,15148,40869,22445,15906,23934,41714,40868,
+34075,23933,34079,40867,41730,23932,41537,31827,37396,23931,41448, 4494,
+23930,41503,23929,26451,38349,32305,23928,24323,23927,40866,31785,37351,
+23925,40858, 4472,23924,40862,23923,40853,38197,23920,23919,38475,23914,
+23913,38152,23908,40840,28843,38481,23905,23904,23903,23902,23901,23900,
+23899,23898,23897,23896,40839,40838,23895,23894,40837,40836,23893,40835,
+23892,23891,40834,40833,23890,40832,23889,23888,40831,40830,23887,40829,
+23886,23885,40828,40827,23884,23882,40823,40826,40822,23879,23878,40819,
+40818,23877,23876,23922,23875,23874,32490,32499,23873,23872,32793,23871,
+17197,23870,23869,29043,33819,24320,40817,29655,38507,24317,24309,28839,
+33590,23867,23868,23865,40816,25558,25555,23866,40815,23860,23864,21472,
+14085,40814,22439,15900,25548,23863,40812,23859,23856,40811,40805,40808,
+23858,33581,33583,23854,23881,33580,33592,23853,23852,19635,33579,40804,
+23848,23844,33560,33558,35258,40795,23843,33557,33556,35255,25392,23842,
+33555,33554,23841,24131,24133,23789,17857,23787,18134,25390,26230,23785,
+25387,26229,26199,23783,23782,23781,23780,23779,23778,24120,24128,23777,
+17845,23775,27731,25366,18759,23762,23761,23760,23759,23758,23757,23851,
+23847,40801,40803,23850,33457,33578,35260,23849,33572,23756,33456,23755,
+25328,18750,10402,24219,24218,24217,24239,41600,41620,24216,24215,24238,
+29171,33958,24221,24241,24214,24237,24213,24236,24223,24243,24231,24248,
+24235,24212,41619,41599,24580,24740,24486,24650,24479,24643,24493,24652,
+24536,24696,24535,24695,24534,24694,24533,24693,24640,40701,30096,38438,
+24638,24477,35149,24692,24532,24054,24053,24052,24051,24050,23803,17878,
+23801,25476,23799,23798,23797,33549, 3281, 2981,35267, 2427, 2429, 2425,
+ 2424, 2495, 7047, 7649, 2423,21521,14156, 2422,35247,23754,40705,23741,
+40684,40700,23725, 4338,40674,23724,40673, 7842, 7748, 7750, 7746, 7745,
+ 7744, 7761, 7758, 7769, 7651, 7653, 7648, 7647, 7646, 7645,21520,14155,
+ 6300,21670,14601, 7644,35246, 8354,35392, 7811, 7809, 7813,37284,31745,
+ 7771,36483,31210, 7788, 7802,36473,31194, 4186, 4465, 4184,13064, 4181,
+ 4180, 4236, 4246,23721,39799,39630,23720,18459,23719,10083,18671,39628,
+33435,13819,10309,39797,28701,21329,36039,30815,42588,42206,25299,25298,
+13062,42586,20667,20672,42197,42203,23718,21332,13824,33434,42590,28700,
+42208,30814,36038,25297,20676,13069,39022,22404,15866,17830,43413,13837,
+ 9689,43025,21338, 9687,17828,40683,11384,19518,39000,11387,42593,21639,
+19521,42214,14460,40699,20689,13087,24049,24531,24691, 4190,23717,22449,
+15912,25296,20692,13099,23753,22427,15895,25337,20666,13060,23716,22403,
+15865,25288,20665,13059,13584, 4199, 4197,23711,19508,11363,25282,20745,
+13140, 9063, 9396, 9184, 9168, 9338,38785,32799, 9254,23359,17393, 9336,
+38782,32791, 9247,23353,17357, 9344,38793,32809, 9282,23387,17431, 9456,
+38858,32878, 9094,23244,17141,23710,21540,14212,15278,40657,22649,16130,
+ 2758,21538,14208, 3347, 5771, 1853, 5082, 1788, 4966,42481,42234, 1708,
+26963,42233,26591,42480, 1852, 3346, 3345,42479,37847, 1851,37846, 1835,
+13635,42478,42232,37845,26590, 1785,10346, 1834,35043, 1833,37844,13634,
+ 6891,27206, 6890,42477, 6889,37843, 5951, 5949,22464,27759, 5930, 5929,
+22774,28067, 5928, 5927,20495,26455, 5926, 5925,26249,26192, 5924,26307,
+ 5934, 5932,27724,22402, 5923, 6119, 5922, 7262,27717, 5920, 6917, 6277,
+ 5918, 5917, 5916, 5915, 5914, 5954, 6118, 6927,27234, 6888,42759,27205,
+29027,43024,42739, 8746,29048, 8768,43069, 6886, 6887,27204,42738,28699,
+43023, 8745, 8742,43021, 8741,43020, 8740,43019, 8784,43196, 8739,43018,
+ 8767,43068, 8523, 8744, 4957,42196, 5672,42195, 4956,42194,24230,42193,
+33939,33938,24127,42192,33769,35199,24492,42191,35198,33768,24688,20662,
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+ 4563,13639,21187, 4554,13904, 4195, 4381,15070,21780, 4533,13903,14067,
+13957,16938,16937,42132,42573,17002,17225,15451,14920,15497,14831,14919,
+15409,22043, 7462,13305,20963, 6811,13304,20962, 6657,16196,22691, 6711,
+13303,13986,13985,13984,17224,14918,14830,42689,42380,42688,42379, 4429,
+13311,20969, 4428,13977,16936,13307,20965, 4423,13509,37779, 4899,13507,
+37777, 4897,13983,42687,42378,42373,42682,13988,42377,42686,42691,42382,
+ 9078,23228,17119, 7511,22094,15487,15440,22073, 7490,13115,20712, 6824,
+42802, 8376, 8375, 7849,22118,15548,13826,13445,13894,13114,13628, 2232,
+21214,13743,13651,21291, 2250, 6477,21167,15144,13606,21841, 7270,13956,
+21399, 2214, 2231,21355,13867,15143,21840, 7269, 6483,21334,13833,13955,
+ 4574,13113,13949, 4571, 4570,13731,21281, 4553,13168,13737,21286, 2230,
+13742,21290, 2249,13954,21398, 2213,13948,21396, 2229,13112,20711, 6735,
+13940,15265,21943,15066,21776,15085,21795,30243,35306,15560,22130, 4548,
+29765,34712,29750,34697, 2378, 5130, 5127,43480,18832, 2377,35094,29986,
+ 2376,35090,29982,15558,22128,35091,29983, 2403,15077,21787,30235,35299,
+30246,35309, 8342,13111,20710, 6777,13110,20709, 7804, 4550,13208,20827,
+ 4380,18680,42605, 4379,13646,18934,42986, 8312, 1778,42238,42611,13167,
+20780, 4359, 7035, 5307,42741, 1710, 1626, 8327, 8326, 2375, 8340, 8325,
+ 7615, 7612,19074,19071,10696,10693, 4562,13166, 8224, 8659,19004,43178,
+15330,21997, 8664, 8226, 2922, 2374, 8223, 8658, 5467,  955, 6059,  953,
+ 5464,  959, 6056,  957, 8661, 8663, 8218, 8221,14243,14242,16236,16235,
+32298,32297, 8076, 6069,42820,42819, 8383,10641,19007,10640, 6755,19006,
+ 6754,15343,22008, 7135, 5491,42828, 2373, 8387, 8386, 7793, 7792,19130,
+19129,10758,10757,19123,42907,43185,43523,42818,42906, 8672, 8675, 1503,
+ 6071, 5483, 1507,32302, 7134, 5490, 8080, 6089,19017,43192,43191,43528,
+43190,43527,42827,42913, 8385, 7791, 7790,19128,19127,10756,10755,10651,
+19016,10648, 6766,19013, 6763, 8233, 8236,42911,42825, 5497, 1549, 6093,
+ 1539, 5496, 1548, 6092, 1538,15069,21779,15332,21999,15083,21793,15090,
+21800,15088,21798,15674,22221,15557,22127,15556,22126,15559,22129,15555,
+22125,15078,21788,15080,21790,15076,21786,15554,22124,15562,22132,15553,
+22123,15552,22122,15074,21784,15073,21783,15184,21867,15949,22485,15948,
+22484,15988,15219,22525,21900,27872,27463,15985,15216,27869,22522,21897,
+27460,27857,27448,27849,27440,25615,27633,27608,21778,15068,27834,27425,
+27765,27606,15970,15201,22507,21882,27833,27424,15969,15200,27899,27898,
+22541,22540,22506,21881,27490,27489,16004,16003,27832,27423,21916,21915,
+15235,15234,27897,27488
+};
+
+
+const int s_nDataSize3 = 24772;
+unsigned int s_Data3[24772] = {
+//Output priorities (total = 24772):
+10, 9, 12, 6, 11, 14, 4, 1, 7, 5, 2, 3, 13, 8, 0,
+0, 1, 2, 219, 218, 76, 217, 216, 77, 1, 0, 74, 78, 79, 75,
+70, 71, 72, 68, 73, 69, 310, 299, 296, 331, 297, 332, 114, 26, 298,
+340, 330, 336, 338, 339, 62, 112, 328, 334, 329, 335, 113, 337, 327, 333,
+115, 60, 27, 61, 63, 273, 215, 36, 213, 31, 35, 39, 319, 312, 320,
+323, 324, 343, 157, 345, 28, 178, 32, 59, 269, 58, 309, 305, 275, 271,
+308, 304, 34, 117, 181, 129, 154, 211, 30, 38, 177, 193, 55, 130, 268,
+33, 303, 174, 29, 37, 119, 212, 143, 188, 66, 270, 141, 183, 194, 179,
+126, 261, 190, 267, 344, 346, 272, 189, 173, 274, 51, 322, 321, 342, 315,
+214, 311, 14, 57, 223, 348, 125, 176, 192, 317, 280, 314, 165, 160, 175,
+326, 127, 17, 247, 172, 262, 5, 231, 99, 138, 124, 54, 301, 325, 167,
+15, 43, 205, 47, 122, 147, 292, 295, 83, 106, 86, 87, 220, 131, 347,
+293, 150, 209, 233, 67, 116, 148, 156, 171, 180, 191, 256, 195, 341, 128,
+277, 291, 281, 289, 294, 313, 102, 46, 103, 207, 229, 236, 240, 224, 227,
+249, 170, 49, 251, 258, 318, 133, 197, 278, 2, 56, 252, 265, 254, 20,
+142, 151, 316, 164, 121, 162, 41, 107, 139, 203, 288, 302, 48, 52, 110,
+53, 64, 4, 16, 284, 135, 307, 3, 40, 155, 202, 23, 93, 22, 92,
+290, 65, 210, 50, 98, 208, 94, 123, 137, 187, 225, 7, 10, 120, 109,
+263, 287, 186, 108, 152, 264, 90, 253, 96, 97, 136, 200, 118, 140, 300,
+306, 185, 6, 11, 89, 259, 85, 101, 132, 196, 24, 45, 260, 244, 91,
+18, 104, 232, 19, 44, 105, 184, 21, 84, 226, 250, 283, 279, 286, 158,
+248, 257, 255, 80, 169, 13, 100, 81, 168, 199, 238, 9, 12, 82, 182,
+201, 266, 146, 204, 230, 239, 241, 159, 221, 285, 134, 88, 242, 246, 8,
+144, 222, 149, 161, 228, 237, 276, 95, 206, 282, 163, 198, 243, 235, 245,
+42, 166, 25, 111, 145, 153, 234, 13, 0, 1, 8, 3, 11, 7, 9,
+2, 12, 4, 6, 5, 10, 0, 61, 62, 0, 2, 3, 5, 6, 8,
+15, 17, 1, 4, 7, 9, 10, 11, 12, 13, 14, 16, 18, 19, 20,
+21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
+36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
+51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 63, 64, 65, 66, 67,
+68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 4, 5,
+2, 0, 1, 3, 7, 10, 8, 11, 6, 9, 97, 100, 22, 123, 124,
+125, 98, 101, 40, 39, 66, 72, 75, 69, 68, 74, 21, 41, 67, 73,
+77, 30, 71, 23, 106, 36, 54, 55, 63, 96, 32, 99, 58, 59, 65,
+38, 107, 27, 17, 56, 57, 64, 70, 76, 29, 15, 31, 122, 102, 25,
+48, 49, 50, 51, 52, 53, 26, 28, 103, 37, 127, 104, 120, 121, 24,
+33, 46, 47, 62, 112, 113, 116, 105, 20, 13, 126, 128, 35, 34, 19,
+42, 43, 44, 45, 60, 61, 18, 79, 84, 91, 16, 14, 82, 89, 94,
+85, 119, 83, 88, 95, 118, 78, 90, 81, 86, 93, 12, 80, 87, 92,
+108, 109, 110, 111, 114, 115, 117, 148, 542, 149, 147, 303, 531, 555, 573,
+574, 532, 556, 150, 153, 155, 578, 304, 560, 536, 151, 154, 157, 534, 558,
+576, 533, 538, 557, 575, 547, 551, 570, 305, 568, 306, 540, 541, 544, 546,
+550, 553, 562, 564, 565, 571, 552, 554, 572, 535, 559, 577, 537, 561, 569,
+539, 543, 545, 548, 549, 563, 566, 567, 308, 307, 152, 156, 158, 382, 144,
+128, 145, 438, 446, 450, 458, 462, 470, 474, 482, 492, 500, 504, 510, 516,
+522, 530, 204, 394, 528, 381, 397, 480, 498, 396, 400, 436, 444, 448, 456,
+460, 468, 472, 490, 502, 508, 514, 520, 286, 388, 393, 294, 403, 273, 384,
+385, 387, 391, 399, 408, 313, 317, 347, 354, 414, 419, 426, 25, 88, 127,
+130, 198, 275, 336, 483, 126, 281, 283, 341, 432, 299, 325, 390, 402, 415,
+416, 417, 418, 427, 428, 116, 124, 134, 142, 221, 229, 298, 479, 486, 497,
+527, 24, 87, 227, 311, 315, 329, 353, 506, 512, 518, 30, 34, 41, 196,
+300, 484, 48, 104, 186, 191, 264, 335, 343, 363, 234, 276, 441, 443, 453,
+455, 465, 467, 477, 495, 525, 222, 269, 476, 494, 524, 395, 89, 140, 413,
+420, 425, 481, 499, 505, 511, 517, 529, 200, 257, 327, 398, 401, 440, 445,
+452, 457, 464, 469, 32, 36, 42, 47, 345, 365, 435, 442, 447, 454, 459,
+466, 471, 478, 489, 496, 501, 507, 513, 519, 526, 202, 323, 146, 170, 177,
+179, 248, 255, 368, 380, 206, 122, 132, 258, 279, 288, 296, 349, 375, 434,
+46, 114, 165, 180, 201, 219, 243, 250, 297, 405, 429, 33, 38, 43, 172,
+203, 208, 346, 392, 404, 410, 485, 488, 183, 216, 261, 348, 386, 430, 20,
+26, 65, 100, 131, 162, 167, 174, 182, 188, 189, 194, 210, 218, 240, 252,
+260, 266, 272, 284, 360, 372, 383, 423, 12, 17, 57, 92, 99, 129, 213,
+215, 230, 231, 278, 291, 293, 339, 389, 406, 411, 422, 15, 60, 62, 97,
+117, 119, 135, 199, 224, 225, 236, 245, 267, 302, 321, 326, 377, 407, 102,
+137, 175, 274, 431, 412, 421, 424, 173, 238, 246, 251, 253, 262, 270, 282,
+366, 370, 378, 437, 439, 449, 451, 461, 463, 473, 475, 491, 493, 503, 509,
+515, 521, 523, 0, 1, 81, 82, 106, 160, 168, 184, 185, 192, 193, 263,
+271, 277, 322, 358, 22, 28, 31, 40, 67, 98, 103, 105, 138, 254, 316,
+319, 355, 328, 10, 14, 49, 52, 59, 70, 73, 90, 112, 133, 220, 228,
+232, 233, 301, 309, 314, 331, 333, 337, 344, 351, 35, 37, 44, 163, 342,
+409, 433, 487, 259, 27, 29, 39, 50, 161, 164, 176, 178, 181, 187, 190,
+197, 205, 239, 241, 242, 324, 332, 359, 361, 362, 371, 373, 374, 6, 7,
+45, 55, 56, 75, 77, 79, 80, 108, 109, 159, 166, 169, 171, 195, 217,
+237, 247, 249, 256, 265, 268, 280, 334, 340, 350, 357, 367, 369, 379, 2,
+3, 9, 18, 19, 21, 23, 53, 63, 64, 66, 68, 72, 76, 83, 84,
+93, 95, 96, 101, 107, 111, 120, 121, 123, 125, 139, 141, 143, 212, 244,
+290, 295, 310, 312, 318, 320, 330, 338, 352, 356, 4, 5, 8, 11, 13,
+51, 54, 58, 61, 69, 71, 74, 78, 85, 86, 94, 110, 113, 115, 136,
+207, 209, 211, 214, 223, 226, 235, 285, 287, 289, 292, 364, 376, 16, 91,
+118, 0, 3, 19, 149, 96, 20, 150, 5, 1, 6, 4, 2, 147, 93,
+91, 145, 148, 95, 146, 85, 55, 66, 76, 59, 73, 81, 51, 61, 64,
+54, 58, 92, 94, 63, 173, 62, 86, 65, 75, 60, 74, 82, 56, 52,
+53, 57, 171, 167, 160, 159, 170, 72, 141, 162, 172, 28, 68, 29, 140,
+168, 27, 70, 126, 139, 69, 163, 89, 137, 166, 71, 169, 129, 142, 164,
+116, 135, 143, 90, 67, 113, 121, 165, 161, 131, 123, 125, 133, 30, 7,
+138, 10, 117, 119, 11, 120, 127, 134, 130, 132, 115, 124, 114, 136, 9,
+118, 33, 77, 157, 158, 8, 12, 88, 155, 156, 34, 78, 99, 97, 128,
+36, 44, 87, 35, 43, 15, 13, 17, 122, 21, 23, 25, 144, 37, 45,
+47, 103, 32, 42, 80, 39, 49, 83, 108, 40, 50, 84, 38, 46, 48,
+31, 41, 79, 18, 98, 22, 24, 26, 14, 16, 105, 107, 100, 152, 111,
+109, 104, 101, 110, 112, 106, 153, 102, 151, 154, 0, 1, 3, 4, 2,
+12, 13, 10, 11, 14, 9, 6, 5, 7, 8, 21, 24, 23, 22, 20,
+19, 15, 16, 17, 18, 0, 1, 3, 2, 108, 109, 139, 153, 122, 96,
+178, 97, 126, 95, 101, 100, 94, 174, 140, 172, 175, 173, 5, 36, 154,
+88, 83, 80, 35, 161, 151, 19, 11, 6, 147, 143, 34, 176, 123, 37,
+169, 170, 171, 163, 164, 165, 166, 167, 168, 155, 156, 157, 158, 159, 160,
+82, 162, 177, 152, 81, 111, 7, 12, 20, 128, 4, 93, 21, 64, 13,
+148, 60, 62, 118, 10, 18, 33, 144, 30, 48, 135, 149, 86, 114, 99,
+124, 129, 130, 131, 61, 63, 65, 8, 14, 16, 22, 24, 26, 28, 73,
+75, 77, 90, 56, 72, 74, 76, 78, 51, 53, 55, 57, 59, 67, 69,
+71, 79, 89, 91, 50, 52, 54, 58, 66, 68, 70, 92, 107, 39, 41,
+43, 45, 47, 110, 103, 105, 120, 145, 127, 38, 40, 42, 44, 46, 137,
+102, 104, 106, 31, 32, 49, 9, 15, 17, 23, 29, 87, 25, 27, 150,
+141, 142, 84, 85, 146, 98, 116, 119, 133, 115, 121, 136, 132, 125, 117,
+112, 113, 138, 134, 2, 0, 1, 3, 8, 6, 7, 4, 5, 9, 10,
+0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+15, 16, 2, 1, 4, 8, 7, 9, 6, 0, 5, 3, 10, 109, 107,
+108, 97, 105, 28, 30, 21, 81, 26, 32, 106, 20, 24, 35, 22, 34,
+96, 104, 62, 27, 111, 11, 18, 23, 36, 83, 37, 12, 95, 17, 46,
+56, 25, 40, 42, 87, 89, 14, 16, 13, 29, 103, 82, 110, 15, 19,
+31, 33, 102, 38, 66, 67, 68, 69, 70, 71, 72, 85, 41, 115, 117,
+91, 93, 94, 99, 101, 43, 73, 86, 88, 114, 116, 50, 52, 74, 76,
+77, 78, 79, 39, 113, 44, 45, 47, 48, 49, 51, 53, 54, 55, 57,
+58, 59, 60, 61, 63, 64, 65, 75, 80, 84, 90, 92, 98, 100, 112,
+0, 1, 20, 17, 18, 12, 19, 16, 21, 15, 23, 14, 22, 13, 0,
+6, 5, 11, 3, 9, 2, 8, 1, 7, 4, 10, 3, 4, 11, 14,
+17, 32, 0, 1, 2, 5, 6, 7, 8, 9, 10, 12, 13, 15, 16,
+18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 33,
+34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 2, 3, 0, 1,
+15, 13, 17, 21, 77, 76, 33, 30, 34, 110, 105, 114, 118, 31, 32,
+35, 101, 100, 16, 131, 12, 14, 130, 135, 132, 112, 120, 116, 111, 115,
+119, 79, 117, 113, 121, 20, 133, 80, 134, 78, 81, 44, 109, 49, 47,
+124, 46, 28, 48, 126, 26, 87, 89, 90, 88, 6, 5, 7, 9, 11,
+19, 36, 38, 40, 42, 86, 91, 18, 4, 10, 39, 8, 37, 41, 43,
+45, 60, 127, 27, 61, 106, 129, 59, 108, 128, 53, 54, 57, 58, 62,
+50, 29, 56, 63, 52, 55, 107, 122, 123, 125, 51, 64, 65, 66, 67,
+68, 69, 70, 71, 72, 73, 74, 75, 82, 83, 84, 85, 92, 93, 94,
+95, 96, 97, 98, 99, 102, 103, 104, 23, 25, 24, 22, 175, 174, 176,
+162, 158, 165, 124, 166, 15, 155, 126, 160, 120, 121, 122, 123, 125, 127,
+128, 129, 153, 157, 171, 152, 163, 170, 96, 97, 108, 0, 3, 6, 9,
+12, 66, 69, 72, 75, 78, 81, 130, 131, 150, 151, 156, 159, 161, 168,
+169, 173, 177, 154, 164, 167, 172, 1, 2, 4, 5, 7, 8, 10, 11,
+13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
+29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
+44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
+59, 60, 61, 62, 63, 64, 65, 67, 68, 70, 71, 73, 74, 76, 77,
+79, 80, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94,
+95, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 109, 110, 111, 112,
+113, 114, 115, 116, 117, 118, 119, 132, 133, 134, 135, 136, 137, 138, 139,
+140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 178, 179, 0, 1, 2,
+8, 6, 7, 3, 5, 4, 0, 1305, 1308, 540, 545, 558, 563, 564, 569,
+570, 575, 576, 581, 582, 587, 588, 593, 594, 599, 600, 605, 606, 611, 612,
+617, 618, 623, 624, 629, 630, 635, 636, 641, 642, 647, 648, 653, 654, 657,
+662, 663, 668, 669, 672, 677, 678, 681, 684, 687, 690, 0, 1, 2, 3,
+4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
+34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78,
+79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93,
+94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
+109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123,
+124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138,
+139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153,
+154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168,
+169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183,
+184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198,
+199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
+214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228,
+229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243,
+244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258,
+259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273,
+274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288,
+289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303,
+304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318,
+319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333,
+334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348,
+349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363,
+364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378,
+379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393,
+394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408,
+409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423,
+424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438,
+439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453,
+454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468,
+469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483,
+484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498,
+499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513,
+514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528,
+529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 541, 542, 543, 544,
+546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 559, 560, 561,
+562, 565, 566, 567, 568, 571, 572, 573, 574, 577, 578, 579, 580, 583, 584,
+585, 586, 589, 590, 591, 592, 595, 596, 597, 598, 601, 602, 603, 604, 607,
+608, 609, 610, 613, 614, 615, 616, 619, 620, 621, 622, 625, 626, 627, 628,
+631, 632, 633, 634, 637, 638, 639, 640, 643, 644, 645, 646, 649, 650, 651,
+652, 655, 656, 658, 659, 660, 661, 664, 665, 666, 667, 670, 671, 673, 674,
+675, 676, 679, 680, 682, 683, 685, 686, 688, 689, 691, 692, 693, 694, 695,
+696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710,
+711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725,
+726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740,
+741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755,
+756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770,
+771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785,
+786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800,
+801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815,
+816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830,
+831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845,
+846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860,
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+2257, 2258, 2259, 2260, 2261, 2262, 2263, 2264, 2265, 2266, 2267, 2268, 2269, 2270, 2271,
+2272, 2273, 2274, 2275, 2276, 2277, 2278, 2279, 2280, 2281, 2282, 2283, 2284, 2285, 2286,
+2287, 2288, 2289, 2290, 2291, 2292, 2293, 2294, 2295, 2296, 2297, 2298, 2299, 2300, 2301,
+2302, 2303, 2304, 2305, 2306, 2307, 2308, 2309, 2310, 2311, 2312, 2313, 2314, 2315, 2316,
+2317, 2318, 2319, 2320, 2321, 2322, 2323, 2324, 2325, 2326, 2327, 2328, 2329, 2330, 2331,
+2332, 2333, 2334, 2335, 2336, 2337, 2338, 2339, 2340, 2341, 2342, 2343, 2344, 2345, 2346,
+2347, 2348, 2349, 2350, 2351, 2352, 2353, 2354, 2355, 2356, 2357, 2358, 2359, 2360, 2361,
+2362, 2363, 2364, 2365, 2366, 2367, 2368, 2369, 2370, 2371, 2372, 2373, 2374, 2375, 2376,
+2377, 2378, 2379, 2380, 2381, 2382, 2383, 2384, 2385, 2386, 2387, 2388, 2389, 2390, 2391,
+2392, 2393, 2394, 2395, 2396, 2397, 2398, 2399, 2400, 2401, 2402, 2403, 2404, 2405, 2406,
+2407, 2408, 2409, 2410, 2411, 2412, 2413, 2414, 2415, 2416, 2417, 2418, 2419, 2420, 2421,
+2422, 2423, 2424, 2425, 2426, 2427, 2428, 2429, 2430, 2431, 2432, 2433, 2434, 2435, 2436,
+2437, 2438, 2439, 2440, 2441, 2442, 2443, 2444, 2445, 2446, 2447, 2448, 2449, 2450, 2451,
+2452, 2453, 2454, 2455, 2456, 2457, 2458, 2459, 2460, 2461, 2462, 2463, 2464, 2465, 2466,
+2467, 2468, 2469, 2470, 2471, 2472, 2473, 2474, 2475, 2476, 2477, 2478, 2479, 2480, 2481,
+2482, 2483, 2484, 2485, 2486, 2487, 2488, 2489, 2490, 2491, 2492, 2493, 2494, 2495, 2496,
+2497, 2498, 2499, 2500, 2501, 2502, 2503, 2504, 2505, 2506, 2507, 2508, 2509, 2510, 2511,
+2512, 2513, 2514, 2515, 2516, 2517, 2518, 2519, 2520, 2521, 2522, 2523, 2524, 2525, 2526,
+2527, 2528, 2529, 2530, 2531, 2532, 2533, 2534, 2535, 2536, 2537, 2538, 2539, 2540, 2541,
+2542, 2543, 2544, 2545, 2546, 2547, 2548, 2549, 2550, 2551, 2552, 2553, 2554, 2555, 2556,
+2557, 2558, 2559, 2560, 2561, 2562, 2563, 2564, 2565, 2566, 2567, 2568, 2569, 2570, 2571,
+2572, 2573, 2574, 2575, 2576, 2577, 2578, 2579, 2580, 2581, 2582, 2583, 2584, 2585, 2586,
+2587, 2588, 2589, 2590, 2591, 2592, 2593, 2594, 2595, 2596, 2597, 2598, 2599, 2600, 2601,
+2602, 2603, 2604, 2605, 2606, 2607, 2608, 2609, 2610, 2611, 2612, 2613, 2614, 2615, 2616,
+2617, 2618, 2619, 2620, 2621, 2622, 2623, 2624, 2625, 2626, 2627, 2628, 2629, 2630, 2631,
+2632, 2633, 2634, 2635, 2636, 2637, 2638, 2639, 2640, 2641, 2642, 2643, 2644, 2645, 2646,
+2647, 2648, 2649, 2650, 2651, 2652, 2653, 2654, 2655, 2656, 2657, 2658, 2659, 2660, 2661,
+2662, 2663, 2664, 2665, 2666, 2667, 2668, 2669, 2670, 2671, 2672, 2673, 2674, 2675, 2676,
+2677, 2678, 2679, 2680, 2681, 2682, 2683, 2684, 2685, 2686, 2687, 2688, 2689, 2690, 2691,
+2692, 2693, 2694, 2695, 2696, 2697, 2698, 2699, 2700, 2701, 2702, 2703, 2704, 2705, 2706,
+2707, 2708, 2709, 2710, 2711, 2712, 2713, 2714, 2715, 2716, 2717, 2718, 2719, 2720, 2721,
+2722, 2723, 2724, 2725, 2726, 2727, 2728, 2729, 2730, 2731, 2732, 2733, 2734, 2735, 2736,
+2737, 2738, 2739, 2740, 2741, 2742, 2743, 2744, 2745, 2746, 2747, 2748, 2749, 2750, 2751,
+2752, 2753, 2754, 2755, 2756, 2757, 2758, 2759, 2760, 2761, 2762, 2763, 2764, 2765, 2766,
+2767, 2768, 2769, 2770, 2771, 2772, 2773, 2774, 2775, 2776, 2777, 2778, 2779, 2780, 2781,
+2782, 2783, 2784, 2785, 2786, 2787, 2788, 2789, 2790, 2791, 2792, 2793, 2794, 2795, 2796,
+2797, 2798, 2799, 2800, 2801, 2802, 2803, 2804, 2805, 2806, 2807, 2808, 2809, 2810, 2811,
+2812, 2813, 2814, 2815, 2816, 2817, 2818, 2819, 2820, 2821, 2822, 2823, 2824, 2825, 2826,
+2827, 2828, 2829, 2830, 2831, 2832, 2833, 2834, 2835, 2836, 2837, 2838, 2839, 2840, 2841,
+2842, 2843, 2844, 2845, 2846, 2847, 2848, 2849, 2850, 2851, 2852, 2853, 2854, 2855, 2856,
+2857, 2858, 2859, 2860, 2861, 2862, 2863, 9, 11, 6, 7, 8, 10, 4, 5,
+0, 1, 2, 3, 0, 2, 10, 3, 6, 1, 9, 11, 4, 8, 7,
+5, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
+29, 30, 31, 32, 33, 34, 35, 68, 116, 22, 10, 97, 117, 52, 110,
+7, 19, 111, 115, 6, 18, 0, 74, 88, 12, 48, 108, 99, 109, 38,
+104, 4, 16, 24, 96, 15, 3, 50, 84, 71, 85, 36, 102, 103, 119,
+54, 86, 100, 30, 25, 105, 113, 69, 53, 63, 98, 87, 93, 89, 95,
+9, 21, 62, 114, 5, 17, 26, 55, 2, 14, 65, 8, 20, 64, 92,
+42, 106, 11, 23, 46, 66, 34, 101, 107, 56, 35, 47, 57, 67, 76,
+118, 75, 83, 82, 94, 37, 77, 29, 51, 1, 13, 27, 49, 58, 112,
+39, 59, 28, 70, 44, 73, 80, 81, 32, 72, 31, 43, 33, 40, 41,
+45, 60, 61, 78, 79, 90, 91
+};
+
+
+/**Function*************************************************************
+
+  Synopsis    [Reads library from array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Dar_LibReadNodes()
+{
+    Vec_Int_t * vResult;
+    int i;
+    vResult = Vec_IntAlloc( s_nDataSize1 );
+    for ( i = 0; i < s_nDataSize1; i++ )
+        Vec_IntPush( vResult, s_Data1[i] );
+    return vResult;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads library from array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Dar_LibReadOuts()
+{
+    Vec_Int_t * vResult;
+    int i;
+    vResult = Vec_IntAlloc( s_nDataSize2 );
+    for ( i = 0; i < s_nDataSize2; i++ )
+        Vec_IntPush( vResult, s_Data2[i] );
+    return vResult;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads library from array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Dar_LibReadPrios()
+{
+    Vec_Int_t * vResult;
+    int i;
+    vResult = Vec_IntAlloc( s_nDataSize3 );
+    for ( i = 0; i < s_nDataSize3; i++ )
+        Vec_IntPush( vResult, s_Data3[i] );
+    return vResult;
+}
+
+#if 0
+
+#include "abc.h"
+
+/**Function*************************************************************
+
+  Synopsis    [Generate arrays.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Aig_NtkGenerateArrays( Abc_Ntk_t * pNtk )
+{
+    extern int Io_WriteAigerEncode( char * pBuffer, int Pos, unsigned x );
+
+    Abc_Obj_t * pObj;
+    int i, Count = 0;
+    assert( Abc_NtkPiNum(pNtk) == 4 );
+    assert( Abc_NtkIsStrash(pNtk) );
+    assert( Abc_ObjFanoutNum(Abc_AigConst1(pNtk)) == 0 );
+/*
+    {
+        unsigned char * pBuffer;
+        int Pos, uLit, uLit0, uLit1, Size, Digit;
+
+        Abc_NtkForEachPi( pNtk, pObj, i )
+            pObj->pCopy = (void *)Count++;
+
+        Pos = 0;
+        pBuffer = ALLOC( char, 200000 );
+        Abc_AigForEachAnd( pNtk, pObj, i )
+        {
+            pObj->pCopy = (void *)Count++;
+            uLit  = ((int)pObj->pCopy << 1);
+            uLit0 = (((int)Abc_ObjFanin0(pObj)->pCopy) << 1) | Abc_ObjFaninC0(pObj);
+            uLit1 = (((int)Abc_ObjFanin1(pObj)->pCopy) << 1) | Abc_ObjFaninC1(pObj);
+            assert( uLit0 < uLit1 );
+            Pos = Io_WriteAigerEncode( pBuffer, Pos, uLit  - uLit1 );
+            Pos = Io_WriteAigerEncode( pBuffer, Pos, uLit1 - uLit0 );
+        }
+        // write the buffer
+        Size = 0;
+        for ( i = 0; i < Pos; i++ )
+        {
+            if ( i % 36 == 0 )
+                printf( "\n" );
+
+            Digit = pBuffer[i] & 0xF;
+            if ( Digit < 10 )
+                printf( "%d", Digit );
+            else 
+                printf( "%c", Digit - 10 + 'A' );
+
+
+            Digit = pBuffer[i];
+            Digit >>= 4;
+            if ( Digit < 10 )
+                printf( "%d", Digit );
+            else 
+                printf( "%c", Digit - 10 + 'A' );
+
+        }
+        printf( "\n" );
+        printf( "Size = %d.\n", Pos );
+    }
+*/
+
+
+    Abc_NtkForEachPi( pNtk, pObj, i )
+        pObj->pCopy = (void *)Count++;
+    Abc_AigForEachAnd( pNtk, pObj, i )
+    {
+//        if ( (Count - 4) % 6 == 0 )
+//            printf( "\n" );
+//        printf( "%5d,", (((int)Abc_ObjFanin0(pObj)->pCopy) << 1) | Abc_ObjFaninC0(pObj) );
+//        printf( "%5d,", (((int)Abc_ObjFanin1(pObj)->pCopy) << 1) | Abc_ObjFaninC1(pObj) );
+        pObj->pCopy = (void *)Count++;
+    }
+//    printf( "\n" );
+//    printf( "Nodes = %d.\n", Count-4 );
+
+
+
+    Abc_NtkForEachPo( pNtk, pObj, i )
+    {
+        if ( i % 12 == 0 )
+            printf( "\n" );
+        printf( "%5d,",  (int)Abc_ObjFanin0(pObj)->pCopy );
+    }
+    printf( "\n" );
+    printf( "Outputs = %d.\n", Abc_NtkPoNum(pNtk) );
+
+
+/*
+    {
+        unsigned char * pBuffer;
+        Vec_Int_t * vOuts;
+        int Pos, Prev, Out;
+
+        vOuts = Vec_IntAlloc( 25000 );
+        Abc_NtkForEachPo( pNtk, pObj, i )
+            Vec_IntPush( vOuts, Abc_ObjFaninId0(pObj) );
+        Vec_IntSort( vOuts, 0 );
+
+        Pos = 0;
+        pBuffer = ALLOC( char, 50000 );
+        Prev = 0;
+        Vec_IntForEachEntry( vOuts, Out, i )
+        {
+            assert( Prev < Out );
+            Pos = Io_WriteAigerEncode( pBuffer, Pos, Out - Prev );
+            Prev = Out;
+        }
+        Vec_IntFree( vOuts );
+
+        // write the buffer
+        for ( i = 0; i < Pos; i++ )
+        {
+            if ( i % 32 == 0 )
+                printf( "\n" );
+            printf( "%d,",  pBuffer[i] );
+        }
+        printf( "\n" );
+        printf( "Size = %d.\n", Pos );
+    }
+*/
+
+}
+
+#endif
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darInt.h b/abc70930/src/aig/dar/darInt.h
new file mode 100644
index 00000000..4da793f5
--- /dev/null
+++ b/abc70930/src/aig/dar/darInt.h
@@ -0,0 +1,165 @@
+/**CFile****************************************************************
+
+  FileName    [darInt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Internal declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darInt.h,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __DAR_INT_H__
+#define __DAR_INT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+//#include "bar.h"
+#include "vec.h"
+#include "aig.h"
+#include "dar.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Dar_Man_t_            Dar_Man_t;
+typedef struct Dar_Cut_t_            Dar_Cut_t;
+
+// the AIG 4-cut
+struct Dar_Cut_t_  // 6 words
+{
+    unsigned         uSign;          // cut signature
+    unsigned         uTruth  : 16;   // the truth table of the cut function
+    unsigned         Value   : 11;   // the value of the cut 
+    unsigned         fBest   :  1;   // marks the best cut
+    unsigned         fUsed   :  1;   // marks the cut currently in use
+    unsigned         nLeaves :  3;   // the number of leaves
+    int              pLeaves[4];     // the array of leaves
+};
+
+// the AIG manager
+struct Dar_Man_t_
+{
+    // input data
+    Dar_RwrPar_t *   pPars;          // rewriting parameters
+    Aig_Man_t *      pAig;           // AIG manager 
+    // various data members
+    Aig_MmFixed_t *  pMemCuts;       // memory manager for cuts
+    void *           pManCnf;        // CNF managers
+    // current rewriting step
+    Vec_Ptr_t *      vLeavesBest;    // the best set of leaves
+    int              OutBest;        // the best output (in the library)
+    int              OutNumBest;     // the best number of the output
+    int              GainBest;       // the best gain
+    int              LevelBest;      // the level of node with the best gain
+    int              ClassBest;      // the equivalence class of the best replacement
+    // function statistics
+    int              nTotalSubgs;    // the total number of subgraphs tried
+    int              ClassTimes[222];// the runtimes for each class
+    int              ClassGains[222];// the gains for each class
+    int              ClassSubgs[222];// the graphs for each class
+    int              nCutMemUsed;    // memory used for cuts
+    // rewriting statistics
+    int              nNodesInit;     // the original number of nodes
+    int              nNodesTried;    // the number of nodes attempted
+    int              nCutsAll;       // all cut pairs
+    int              nCutsTried;     // computed cuts
+    int              nCutsUsed;      // used cuts
+    int              nCutsBad;       // bad cuts due to absent fanin
+    int              nCutsGood;      // good cuts
+    int              nCutsSkipped;   // skipped bad cuts
+    // timing statistics
+    int              timeCuts;
+    int              timeEval;
+    int              timeOther;
+    int              timeTotal;
+    int              time1;
+    int              time2;
+};
+
+static inline Dar_Cut_t *  Dar_ObjCuts( Aig_Obj_t * pObj )                         { return pObj->pData;    }
+static inline void         Dar_ObjSetCuts( Aig_Obj_t * pObj, Dar_Cut_t * pCuts )   { assert( !Aig_ObjIsNone(pObj) ); pObj->pData = pCuts;   }
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                          ITERATORS                               ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over all cuts of the node
+#define Dar_ObjForEachCutAll( pObj, pCut, i )                                   \
+    for ( (pCut) = Dar_ObjCuts(pObj), i = 0; i < (int)(pObj)->nCuts; i++, pCut++ ) 
+#define Dar_ObjForEachCut( pObj, pCut, i )                                      \
+    for ( (pCut) = Dar_ObjCuts(pObj), i = 0; i < (int)(pObj)->nCuts; i++, pCut++ ) if ( (pCut)->fUsed==0 ) {} else
+// iterator over leaves of the cut
+#define Dar_CutForEachLeaf( p, pCut, pLeaf, i )                                 \
+    for ( i = 0; (i < (int)(pCut)->nLeaves) && (((pLeaf) = Aig_ManObj(p, (pCut)->pLeaves[i])), 1); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== darBalance.c ========================================================*/
+/*=== darCore.c ===========================================================*/
+/*=== darCut.c ============================================================*/
+extern void            Dar_ManCutsStart( Dar_Man_t * p );
+extern void            Dar_ManCutsFree( Dar_Man_t * p );
+extern Dar_Cut_t *     Dar_ObjComputeCuts_rec( Dar_Man_t * p, Aig_Obj_t * pObj );
+extern Dar_Cut_t *     Dar_ObjComputeCuts( Dar_Man_t * p, Aig_Obj_t * pObj );
+/*=== darData.c ===========================================================*/
+extern Vec_Int_t *     Dar_LibReadNodes();
+extern Vec_Int_t *     Dar_LibReadOuts();
+extern Vec_Int_t *     Dar_LibReadPrios();
+/*=== darLib.c ============================================================*/
+extern void            Dar_LibStart();
+extern void            Dar_LibStop();
+extern void            Dar_LibPrepare( int nSubgraphs );
+extern void            Dar_LibReturnCanonicals( unsigned * pCanons );
+extern void            Dar_LibEval( Dar_Man_t * p, Aig_Obj_t * pRoot, Dar_Cut_t * pCut, int Required );
+extern Aig_Obj_t *     Dar_LibBuildBest( Dar_Man_t * p );
+/*=== darMan.c ============================================================*/
+extern Dar_Man_t *     Dar_ManStart( Aig_Man_t * pAig, Dar_RwrPar_t * pPars );
+extern void            Dar_ManStop( Dar_Man_t * p );
+extern void            Dar_ManPrintStats( Dar_Man_t * p );
+/*=== darPrec.c ============================================================*/
+extern char **         Dar_Permutations( int n );
+extern void            Dar_Truth4VarNPN( unsigned short ** puCanons, char ** puPhases, char ** puPerms, unsigned char ** puMap );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/dar/darLib.c b/abc70930/src/aig/dar/darLib.c
new file mode 100644
index 00000000..e0e97055
--- /dev/null
+++ b/abc70930/src/aig/dar/darLib.c
@@ -0,0 +1,980 @@
+/**CFile****************************************************************
+
+  FileName    [darLib.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Library of AIG subgraphs used for rewriting.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darLib.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Dar_Lib_t_            Dar_Lib_t;
+typedef struct Dar_LibObj_t_         Dar_LibObj_t;
+typedef struct Dar_LibDat_t_         Dar_LibDat_t;
+
+struct Dar_LibObj_t_ // library object (2 words)
+{
+    unsigned         Fan0    : 16;  // the first fanin
+    unsigned         Fan1    : 16;  // the second fanin
+    unsigned         fCompl0 :  1;  // the first compl attribute
+    unsigned         fCompl1 :  1;  // the second compl attribute
+    unsigned         fPhase  :  1;  // the phase of the node
+    unsigned         fTerm   :  1;  // indicates a PI
+    unsigned         Num     : 28;  // internal use
+};
+
+struct Dar_LibDat_t_ // library object data
+{
+    Aig_Obj_t *      pFunc;         // the corresponding AIG node if it exists
+    int              Level;         // level of this node after it is constructured
+    int              TravId;        // traversal ID of the library object data
+    unsigned char    fMffc;         // set to one if node is part of MFFC
+    unsigned char    nLats[3];      // the number of latches on the input/output stem
+};
+
+struct Dar_Lib_t_ // library 
+{
+    // objects
+    Dar_LibObj_t *   pObjs;         // the set of library objects
+    int              nObjs;         // the number of objects used
+    int              iObj;          // the current object
+    // structures by class
+    int              nSubgr[222];   // the number of subgraphs by class
+    int *            pSubgr[222];   // the subgraphs for each class
+    int *            pSubgrMem;     // memory for subgraph pointers
+    int              nSubgrTotal;   // the total number of subgraph
+    // structure priorities
+    int *            pPriosMem;     // memory for priority of structures
+    int *            pPrios[222];   // pointers to the priority numbers
+    // structure places in the priorities
+    int *            pPlaceMem;     // memory for places of structures in the priority lists
+    int *            pPlace[222];   // pointers to the places numbers
+    // structure scores
+    int *            pScoreMem;     // memory for scores of structures
+    int *            pScore[222];   // pointers to the scores numbers
+    // nodes by class
+    int              nNodes[222];   // the number of nodes by class
+    int *            pNodes[222];   // the nodes for each class
+    int *            pNodesMem;     // memory for nodes pointers
+    int              nNodesTotal;   // the total number of nodes
+    // prepared library
+    int              nSubgraphs;
+    int              nNodes0Max;
+    // nodes by class
+    int              nNodes0[222];   // the number of nodes by class
+    int *            pNodes0[222];   // the nodes for each class
+    int *            pNodes0Mem;     // memory for nodes pointers
+    int              nNodes0Total;   // the total number of nodes
+    // structures by class
+    int              nSubgr0[222];   // the number of subgraphs by class
+    int *            pSubgr0[222];   // the subgraphs for each class
+    int *            pSubgr0Mem;     // memory for subgraph pointers
+    int              nSubgr0Total;   // the total number of subgraph
+    // object data
+    Dar_LibDat_t *   pDatas;
+    int              nDatas;
+    // information about NPN classes
+    char **          pPerms4;
+    unsigned short * puCanons; 
+    char *           pPhases; 
+    char *           pPerms; 
+    unsigned char *  pMap;
+};
+
+static Dar_Lib_t * s_DarLib = NULL;
+
+static inline Dar_LibObj_t * Dar_LibObj( Dar_Lib_t * p, int Id )    { return p->pObjs + Id; }
+static inline int            Dar_LibObjTruth( Dar_LibObj_t * pObj ) { return pObj->Num < (0xFFFF & ~pObj->Num) ? pObj->Num : (0xFFFF & ~pObj->Num); }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Lib_t * Dar_LibAlloc( int nObjs )
+{
+    unsigned uTruths[4] = { 0xAAAA, 0xCCCC, 0xF0F0, 0xFF00 };
+    Dar_Lib_t * p;
+    int i;//, clk = clock();
+    p = ALLOC( Dar_Lib_t, 1 );
+    memset( p, 0, sizeof(Dar_Lib_t) );
+    // allocate objects
+    p->nObjs = nObjs;
+    p->pObjs = ALLOC( Dar_LibObj_t, nObjs );
+    memset( p->pObjs, 0, sizeof(Dar_LibObj_t) * nObjs );
+    // allocate canonical data
+    p->pPerms4 = Dar_Permutations( 4 );
+    Dar_Truth4VarNPN( &p->puCanons, &p->pPhases, &p->pPerms, &p->pMap );
+    // start the elementary objects
+    p->iObj = 4;
+    for ( i = 0; i < 4; i++ )
+    {
+        p->pObjs[i].fTerm = 1;
+        p->pObjs[i].Num = uTruths[i];
+    }
+//    PRT( "Library start", clock() - clk );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Frees the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibFree( Dar_Lib_t * p )
+{
+    free( p->pObjs );
+    free( p->pDatas );
+    free( p->pNodesMem );
+    free( p->pNodes0Mem );
+    free( p->pSubgrMem );
+    free( p->pSubgr0Mem );
+    free( p->pPriosMem );
+    FREE( p->pPlaceMem );
+    FREE( p->pScoreMem );
+    free( p->pPerms4 );
+    free( p->puCanons );
+    free( p->pPhases );
+    free( p->pPerms );
+    free( p->pMap );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns canonical truth tables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibReturnCanonicals( unsigned * pCanons )
+{
+    int Visits[222] = {0};
+    int i, k;
+    // find canonical truth tables
+    for ( i = k = 0; i < (1<<16); i++ )
+        if ( !Visits[s_DarLib->pMap[i]] )
+        {
+            Visits[s_DarLib->pMap[i]] = 1;
+            pCanons[k++] = ((i<<16) | i);
+        }
+    assert( k == 222 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one AND to the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibAddNode( Dar_Lib_t * p, int Id0, int Id1, int fCompl0, int fCompl1 )
+{
+    Dar_LibObj_t * pFan0 = Dar_LibObj( p, Id0 );
+    Dar_LibObj_t * pFan1 = Dar_LibObj( p, Id1 );
+    Dar_LibObj_t * pObj  = p->pObjs + p->iObj++;
+    pObj->Fan0 = Id0;
+    pObj->Fan1 = Id1;
+    pObj->fCompl0 = fCompl0;
+    pObj->fCompl1 = fCompl1;
+    pObj->fPhase = (fCompl0 ^ pFan0->fPhase) & (fCompl1 ^ pFan1->fPhase);
+    pObj->Num = 0xFFFF & (fCompl0? ~pFan0->Num : pFan0->Num) & (fCompl1? ~pFan1->Num : pFan1->Num);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one AND to the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibSetup_rec( Dar_Lib_t * p, Dar_LibObj_t * pObj, int Class, int fCollect )
+{
+    if ( pObj->fTerm || (int)pObj->Num == Class )
+        return;
+    pObj->Num = Class;
+    Dar_LibSetup_rec( p, Dar_LibObj(p, pObj->Fan0), Class, fCollect );
+    Dar_LibSetup_rec( p, Dar_LibObj(p, pObj->Fan1), Class, fCollect );
+    if ( fCollect )
+        p->pNodes[Class][ p->nNodes[Class]++ ] = pObj-p->pObjs;
+    else
+        p->nNodes[Class]++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one AND to the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibSetup( Dar_Lib_t * p, Vec_Int_t * vOuts, Vec_Int_t * vPrios )
+{
+    int fTraining = 0;
+    Dar_LibObj_t * pObj;
+    int nNodesTotal, uTruth, Class, Out, i, k;
+    assert( p->iObj == p->nObjs );
+
+    // count the number of representatives of each class
+    for ( i = 0; i < 222; i++ )
+        p->nSubgr[i] = p->nNodes[i] = 0;
+    Vec_IntForEachEntry( vOuts, Out, i )
+    {
+        pObj = Dar_LibObj( p, Out );
+        uTruth = Dar_LibObjTruth( pObj );
+        Class = p->pMap[uTruth];
+        p->nSubgr[Class]++;
+    }
+    // allocate memory for the roots of each class
+    p->pSubgrMem = ALLOC( int, Vec_IntSize(vOuts) );
+    p->pSubgr0Mem = ALLOC( int, Vec_IntSize(vOuts) );
+    p->nSubgrTotal = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+        p->pSubgr[i] = p->pSubgrMem + p->nSubgrTotal;
+        p->pSubgr0[i] = p->pSubgr0Mem + p->nSubgrTotal;
+        p->nSubgrTotal += p->nSubgr[i];
+        p->nSubgr[i] = 0;
+    }
+    assert( p->nSubgrTotal == Vec_IntSize(vOuts) );
+    // add the outputs to storage
+    Vec_IntForEachEntry( vOuts, Out, i )
+    {
+        pObj = Dar_LibObj( p, Out );
+        uTruth = Dar_LibObjTruth( pObj );
+        Class = p->pMap[uTruth];
+        p->pSubgr[Class][ p->nSubgr[Class]++ ] = Out;
+    }
+
+    if ( fTraining )
+    {
+        // allocate memory for the priority of roots of each class
+        p->pPriosMem = ALLOC( int, Vec_IntSize(vOuts) );
+        p->nSubgrTotal = 0;
+        for ( i = 0; i < 222; i++ )
+        {
+            p->pPrios[i] = p->pPriosMem + p->nSubgrTotal;
+            p->nSubgrTotal += p->nSubgr[i];
+            for ( k = 0; k < p->nSubgr[i]; k++ )
+                p->pPrios[i][k] = k;
+
+        }
+        assert( p->nSubgrTotal == Vec_IntSize(vOuts) );
+
+        // allocate memory for the priority of roots of each class
+        p->pPlaceMem = ALLOC( int, Vec_IntSize(vOuts) );
+        p->nSubgrTotal = 0;
+        for ( i = 0; i < 222; i++ )
+        {
+            p->pPlace[i] = p->pPlaceMem + p->nSubgrTotal;
+            p->nSubgrTotal += p->nSubgr[i];
+            for ( k = 0; k < p->nSubgr[i]; k++ )
+                p->pPlace[i][k] = k;
+
+        }
+        assert( p->nSubgrTotal == Vec_IntSize(vOuts) );
+
+        // allocate memory for the priority of roots of each class
+        p->pScoreMem = ALLOC( int, Vec_IntSize(vOuts) );
+        p->nSubgrTotal = 0;
+        for ( i = 0; i < 222; i++ )
+        {
+            p->pScore[i] = p->pScoreMem + p->nSubgrTotal;
+            p->nSubgrTotal += p->nSubgr[i];
+            for ( k = 0; k < p->nSubgr[i]; k++ )
+                p->pScore[i][k] = 0;
+
+        }
+        assert( p->nSubgrTotal == Vec_IntSize(vOuts) );
+    }
+    else
+    {
+        int Counter = 0;
+        // allocate memory for the priority of roots of each class
+        p->pPriosMem = ALLOC( int, Vec_IntSize(vOuts) );
+        p->nSubgrTotal = 0;
+        for ( i = 0; i < 222; i++ )
+        {
+            p->pPrios[i] = p->pPriosMem + p->nSubgrTotal;
+            p->nSubgrTotal += p->nSubgr[i];
+            for ( k = 0; k < p->nSubgr[i]; k++ )
+                p->pPrios[i][k] = Vec_IntEntry(vPrios, Counter++);
+
+        }
+        assert( p->nSubgrTotal == Vec_IntSize(vOuts) );
+        assert( Counter == Vec_IntSize(vPrios) );
+    }
+
+    // create traversal IDs
+    for ( i = 0; i < p->iObj; i++ )
+        Dar_LibObj(p, i)->Num = 0xff;
+    // count nodes in each class
+    for ( i = 0; i < 222; i++ )
+        for ( k = 0; k < p->nSubgr[i]; k++ )
+            Dar_LibSetup_rec( p, Dar_LibObj(p, p->pSubgr[i][k]), i, 0 );
+    // count the total number of nodes
+    p->nNodesTotal = 0;
+    for ( i = 0; i < 222; i++ )
+        p->nNodesTotal += p->nNodes[i];
+    // allocate memory for the nodes of each class
+    p->pNodesMem = ALLOC( int, p->nNodesTotal );
+    p->pNodes0Mem = ALLOC( int, p->nNodesTotal );
+    p->nNodesTotal = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+        p->pNodes[i] = p->pNodesMem + p->nNodesTotal;
+        p->pNodes0[i] = p->pNodes0Mem + p->nNodesTotal;
+        p->nNodesTotal += p->nNodes[i];
+        p->nNodes[i] = 0;
+    }
+    // create traversal IDs
+    for ( i = 0; i < p->iObj; i++ )
+        Dar_LibObj(p, i)->Num = 0xff;
+    // add the nodes to storage
+    nNodesTotal = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+         for ( k = 0; k < p->nSubgr[i]; k++ )
+            Dar_LibSetup_rec( p, Dar_LibObj(p, p->pSubgr[i][k]), i, 1 );
+         nNodesTotal += p->nNodes[i];
+//printf( "Class %3d : Subgraphs = %4d. Nodes = %5d.\n", i, p->nSubgr[i], p->nNodes[i] );
+    }
+    assert( nNodesTotal == p->nNodesTotal );
+     // prepare the number of the PI nodes
+    for ( i = 0; i < 4; i++ )
+        Dar_LibObj(p, i)->Num = i;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibCreateData( Dar_Lib_t * p, int nDatas )
+{
+    if ( p->nDatas == nDatas )
+        return;
+    FREE( p->pDatas );
+    // allocate datas
+    p->nDatas = nDatas;
+    p->pDatas = ALLOC( Dar_LibDat_t, nDatas );
+    memset( p->pDatas, 0, sizeof(Dar_LibDat_t) * nDatas );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one AND to the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibSetup0_rec( Dar_Lib_t * p, Dar_LibObj_t * pObj, int Class, int fCollect )
+{
+    if ( pObj->fTerm || (int)pObj->Num == Class )
+        return;
+    pObj->Num = Class;
+    Dar_LibSetup0_rec( p, Dar_LibObj(p, pObj->Fan0), Class, fCollect );
+    Dar_LibSetup0_rec( p, Dar_LibObj(p, pObj->Fan1), Class, fCollect );
+    if ( fCollect )
+        p->pNodes0[Class][ p->nNodes0[Class]++ ] = pObj-p->pObjs;
+    else
+        p->nNodes0[Class]++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibPrepare( int nSubgraphs )
+{
+    Dar_Lib_t * p = s_DarLib;
+    int i, k, nNodes0Total;
+    if ( p->nSubgraphs == nSubgraphs )
+        return;
+
+    // favor special classes:
+    //  1 : F = (!d*!c*!b*!a)
+    //  4 : F = (!d*!c*!(b*a))
+    // 12 : F = (!d*!(c*!(!b*!a)))
+    // 20 : F = (!d*!(c*b*a))
+
+    // set the subgraph counters 
+    p->nSubgr0Total = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+//        if ( i == 1 || i == 4 || i == 12 || i == 20 ) // special classes 
+        if ( i == 1 ) // special classes 
+            p->nSubgr0[i] = p->nSubgr[i];
+        else
+            p->nSubgr0[i] = AIG_MIN( p->nSubgr[i], nSubgraphs );
+        p->nSubgr0Total += p->nSubgr0[i];
+        for ( k = 0; k < p->nSubgr0[i]; k++ )
+            p->pSubgr0[i][k] = p->pSubgr[i][ p->pPrios[i][k] ];
+    }
+
+    // count the number of nodes
+    // clean node counters
+    for ( i = 0; i < 222; i++ )
+        p->nNodes0[i] = 0;
+    // create traversal IDs
+    for ( i = 0; i < p->iObj; i++ )
+        Dar_LibObj(p, i)->Num = 0xff;
+    // count nodes in each class
+    // count the total number of nodes and the largest class
+    p->nNodes0Total = 0;
+    p->nNodes0Max = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+        for ( k = 0; k < p->nSubgr0[i]; k++ )
+            Dar_LibSetup0_rec( p, Dar_LibObj(p, p->pSubgr0[i][k]), i, 0 );
+        p->nNodes0Total += p->nNodes0[i];
+        p->nNodes0Max = AIG_MAX( p->nNodes0Max, p->nNodes0[i] );
+    }
+
+    // clean node counters
+    for ( i = 0; i < 222; i++ )
+        p->nNodes0[i] = 0;
+    // create traversal IDs
+    for ( i = 0; i < p->iObj; i++ )
+        Dar_LibObj(p, i)->Num = 0xff;
+    // add the nodes to storage
+    nNodes0Total = 0;
+    for ( i = 0; i < 222; i++ )
+    {
+        for ( k = 0; k < p->nSubgr0[i]; k++ )
+            Dar_LibSetup0_rec( p, Dar_LibObj(p, p->pSubgr0[i][k]), i, 1 );
+         nNodes0Total += p->nNodes0[i];
+    }
+    assert( nNodes0Total == p->nNodes0Total );
+     // prepare the number of the PI nodes
+    for ( i = 0; i < 4; i++ )
+        Dar_LibObj(p, i)->Num = i;
+
+    // realloc the datas
+    Dar_LibCreateData( p, p->nNodes0Max + 32 ); 
+    // allocated more because Dar_LibBuildBest() sometimes requires more entries
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads library from array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Lib_t * Dar_LibRead()
+{
+    Vec_Int_t * vObjs, * vOuts, * vPrios;
+    Dar_Lib_t * p;
+    int i;
+    // read nodes and outputs
+    vObjs  = Dar_LibReadNodes();
+    vOuts  = Dar_LibReadOuts();
+    vPrios = Dar_LibReadPrios();
+    // create library
+    p = Dar_LibAlloc( Vec_IntSize(vObjs)/2 + 4 );
+    // create nodes
+    for ( i = 0; i < vObjs->nSize; i += 2 )
+        Dar_LibAddNode( p, vObjs->pArray[i] >> 1, vObjs->pArray[i+1] >> 1,
+            vObjs->pArray[i] & 1, vObjs->pArray[i+1] & 1 );
+    // create outputs
+    Dar_LibSetup( p, vOuts, vPrios );
+    Vec_IntFree( vObjs );
+    Vec_IntFree( vOuts );
+    Vec_IntFree( vPrios );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibStart()
+{
+//    int clk = clock();
+    assert( s_DarLib == NULL );
+    s_DarLib = Dar_LibRead();
+//    printf( "The 4-input library started with %d nodes and %d subgraphs. ", s_DarLib->nObjs - 4, s_DarLib->nSubgrTotal );
+//    PRT( "Time", clock() - clk );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the library.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibStop()
+{
+    assert( s_DarLib != NULL );
+    Dar_LibFree( s_DarLib );
+    s_DarLib = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the score of the class and adjusts the priority of this class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibIncrementScore( int Class, int Out, int Gain )
+{
+    int * pPrios = s_DarLib->pPrios[Class];  // pPrios[i] = Out
+    int * pPlace = s_DarLib->pPlace[Class];  // pPlace[Out] = i
+    int * pScore = s_DarLib->pScore[Class];  // score of Out
+    int Out2;
+    assert( Class >= 0 && Class < 222 );
+    assert( Out >= 0 && Out < s_DarLib->nSubgr[Class] );
+    assert( pPlace[pPrios[Out]] == Out );
+    // increment the score
+    pScore[Out] += Gain;
+    // move the out in the order 
+    while ( pPlace[Out] > 0 && pScore[Out] > pScore[ pPrios[pPlace[Out]-1] ] )
+    {
+        // get the previous output in the priority list
+        Out2 = pPrios[pPlace[Out]-1];
+        // swap Out and Out2
+        pPlace[Out]--;
+        pPlace[Out2]++;
+        pPrios[pPlace[Out]] = Out;
+        pPrios[pPlace[Out2]] = Out2;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints out the priorities into the file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibDumpPriorities()
+{
+    int i, k, Out, Out2, Counter = 0, Printed = 0;
+    printf( "\nOutput priorities (total = %d):\n", s_DarLib->nSubgrTotal );
+    for ( i = 0; i < 222; i++ )
+    {
+//        printf( "Class%d: ", i );
+        for ( k = 0; k < s_DarLib->nSubgr[i]; k++ )
+        {
+            Out = s_DarLib->pPrios[i][k];
+            Out2 = k == 0 ? Out : s_DarLib->pPrios[i][k-1];
+            assert( s_DarLib->pScore[i][Out2] >= s_DarLib->pScore[i][Out] );
+//            printf( "%d(%d), ", Out, s_DarLib->pScore[i][Out] );
+            printf( "%d, ", Out );
+            Printed++;
+            if ( ++Counter == 15 )
+            {
+                printf( "\n" );
+                Counter = 0;
+            }
+        }
+    }
+    printf( "\n" );
+    assert( Printed == s_DarLib->nSubgrTotal );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Matches the cut with its canonical form.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_LibCutMatch( Dar_Man_t * p, Dar_Cut_t * pCut )
+{
+    Aig_Obj_t * pFanin;
+    unsigned uPhase;
+    char * pPerm;
+    int i;
+    assert( pCut->nLeaves == 4 );
+    // get the fanin permutation
+    uPhase = s_DarLib->pPhases[pCut->uTruth];
+    pPerm = s_DarLib->pPerms4[ (int)s_DarLib->pPerms[pCut->uTruth] ];
+    // collect fanins with the corresponding permutation/phase
+    for ( i = 0; i < (int)pCut->nLeaves; i++ )
+    {
+        pFanin = Aig_ManObj( p->pAig, pCut->pLeaves[ (int)pPerm[i] ] );
+        if ( pFanin == NULL )
+        {
+            p->nCutsBad++;
+            return 0;
+        }
+        pFanin = Aig_NotCond(pFanin, ((uPhase >> i) & 1) );
+        s_DarLib->pDatas[i].pFunc = pFanin;
+        s_DarLib->pDatas[i].Level = Aig_Regular(pFanin)->Level;
+    }
+    p->nCutsGood++;
+    return 1;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Marks the MFFC of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_LibCutMarkMffc( Aig_Man_t * p, Aig_Obj_t * pRoot, int nLeaves )
+{
+    int i, nNodes;
+    // mark the cut leaves
+    for ( i = 0; i < nLeaves; i++ )
+        Aig_Regular(s_DarLib->pDatas[i].pFunc)->nRefs++;
+    // label MFFC with current ID
+    nNodes = Aig_NodeMffsLabel( p, pRoot );
+    // unmark the cut leaves
+    for ( i = 0; i < nLeaves; i++ )
+        Aig_Regular(s_DarLib->pDatas[i].pFunc)->nRefs--;
+    return nNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluates one cut.]
+
+  Description [Returns the best gain.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibObjPrint_rec( Dar_LibObj_t * pObj )
+{
+    if ( pObj->fTerm )
+    {
+        printf( "%c", 'a' + (int)(pObj - s_DarLib->pObjs) );
+        return;
+    }
+    printf( "(" );
+    Dar_LibObjPrint_rec( Dar_LibObj(s_DarLib, pObj->Fan0) );
+    if ( pObj->fCompl0 )
+        printf( "\'" );
+    Dar_LibObjPrint_rec( Dar_LibObj(s_DarLib, pObj->Fan1) );
+    if ( pObj->fCompl0 )
+        printf( "\'" );
+    printf( ")" );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Assigns numbers to the nodes of one class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibEvalAssignNums( Dar_Man_t * p, int Class )
+{
+    Dar_LibObj_t * pObj;
+    Dar_LibDat_t * pData, * pData0, * pData1;
+    Aig_Obj_t * pFanin0, * pFanin1;
+    int i;
+    for ( i = 0; i < s_DarLib->nNodes0[Class]; i++ )
+    {
+        // get one class node, assign its temporary number and set its data
+        pObj = Dar_LibObj(s_DarLib, s_DarLib->pNodes0[Class][i]);
+        pObj->Num = 4 + i;
+        assert( (int)pObj->Num < s_DarLib->nNodes0Max + 4 );
+        pData = s_DarLib->pDatas + pObj->Num;
+        pData->fMffc = 0;
+        pData->pFunc = NULL;
+        pData->TravId = 0xFFFF;
+
+        // explore the fanins
+        assert( (int)Dar_LibObj(s_DarLib, pObj->Fan0)->Num < s_DarLib->nNodes0Max + 4 );
+        assert( (int)Dar_LibObj(s_DarLib, pObj->Fan1)->Num < s_DarLib->nNodes0Max + 4 );
+        pData0 = s_DarLib->pDatas + Dar_LibObj(s_DarLib, pObj->Fan0)->Num;
+        pData1 = s_DarLib->pDatas + Dar_LibObj(s_DarLib, pObj->Fan1)->Num;
+        pData->Level = 1 + AIG_MAX(pData0->Level, pData1->Level);
+        if ( pData0->pFunc == NULL || pData1->pFunc == NULL )
+            continue;
+        pFanin0 = Aig_NotCond( pData0->pFunc, pObj->fCompl0 );
+        pFanin1 = Aig_NotCond( pData1->pFunc, pObj->fCompl1 );
+        pData->pFunc = Aig_TableLookupTwo( p->pAig, pFanin0, pFanin1 );
+        if ( pData->pFunc )
+        {
+            // update the level to be more accurate
+            pData->Level = Aig_Regular(pData->pFunc)->Level;
+            // mark the node if it is part of MFFC
+            pData->fMffc = Aig_ObjIsTravIdCurrent(p->pAig, pData->pFunc);
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluates one cut.]
+
+  Description [Returns the best gain.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_LibEval_rec( Dar_LibObj_t * pObj, int Out, int nNodesSaved, int Required )
+{
+    Dar_LibDat_t * pData;
+    int Area;
+    if ( pObj->fTerm )
+        return 0;
+    assert( pObj->Num > 3 );
+    pData = s_DarLib->pDatas + pObj->Num;
+    if ( pData->Level > Required )
+        return 0xff;
+    if ( pData->pFunc && !pData->fMffc )
+        return 0;
+    if ( pData->TravId == Out )
+        return 0;
+    pData->TravId = Out;
+    // this is a new node - get a bound on the area of its branches
+    nNodesSaved--;
+    Area = Dar_LibEval_rec( Dar_LibObj(s_DarLib, pObj->Fan0), Out, nNodesSaved, Required+1 );
+    if ( Area > nNodesSaved )
+        return 0xff;
+    Area += Dar_LibEval_rec( Dar_LibObj(s_DarLib, pObj->Fan1), Out, nNodesSaved, Required+1 );
+    if ( Area > nNodesSaved )
+        return 0xff;
+    return Area + 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluates one cut.]
+
+  Description [Returns the best gain.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibEval( Dar_Man_t * p, Aig_Obj_t * pRoot, Dar_Cut_t * pCut, int Required )
+{
+    int fTraining = 0;
+    Dar_LibObj_t * pObj;
+    int Out, k, Class, nNodesSaved, nNodesAdded, nNodesGained, clk;
+    clk = clock();
+    if ( pCut->nLeaves != 4 )
+        return;
+    // check if the cut exits and assigns leaves and their levels
+    if ( !Dar_LibCutMatch(p, pCut) )
+        return;
+    // mark MFFC of the node
+    nNodesSaved = Dar_LibCutMarkMffc( p->pAig, pRoot, pCut->nLeaves );
+    // evaluate the cut
+    Class = s_DarLib->pMap[pCut->uTruth];
+    Dar_LibEvalAssignNums( p, Class );
+    // profile outputs by their savings
+    p->nTotalSubgs += s_DarLib->nSubgr0[Class];
+    p->ClassSubgs[Class] += s_DarLib->nSubgr0[Class];
+    for ( Out = 0; Out < s_DarLib->nSubgr0[Class]; Out++ )
+    {
+        pObj = Dar_LibObj(s_DarLib, s_DarLib->pSubgr0[Class][Out]);
+        if ( Aig_Regular(s_DarLib->pDatas[pObj->Num].pFunc) == pRoot )
+            continue;
+        nNodesAdded = Dar_LibEval_rec( pObj, Out, nNodesSaved - !p->pPars->fUseZeros, Required );
+        nNodesGained = nNodesSaved - nNodesAdded;
+        if ( fTraining && nNodesGained >= 0 )
+            Dar_LibIncrementScore( Class, Out, nNodesGained + 1 );
+        if ( nNodesGained < 0 || (nNodesGained == 0 && !p->pPars->fUseZeros) )
+            continue;
+        if ( nNodesGained <  p->GainBest || 
+            (nNodesGained == p->GainBest && s_DarLib->pDatas[pObj->Num].Level >= p->LevelBest) )
+            continue;
+        // remember this possibility
+        Vec_PtrClear( p->vLeavesBest );
+        for ( k = 0; k < (int)pCut->nLeaves; k++ )
+            Vec_PtrPush( p->vLeavesBest, s_DarLib->pDatas[k].pFunc );
+        p->OutBest    = s_DarLib->pSubgr0[Class][Out];
+        p->OutNumBest = Out;
+        p->LevelBest  = s_DarLib->pDatas[pObj->Num].Level;
+        p->GainBest   = nNodesGained;
+        p->ClassBest  = Class;
+        assert( p->LevelBest <= Required );
+    }
+clk = clock() - clk;
+p->ClassTimes[Class] += clk;
+p->timeEval += clk;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Clears the fields of the nodes used in this cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_LibBuildClear_rec( Dar_LibObj_t * pObj, int * pCounter )
+{
+    if ( pObj->fTerm )
+        return;
+    pObj->Num = (*pCounter)++;
+    s_DarLib->pDatas[ pObj->Num ].pFunc = NULL;
+    Dar_LibBuildClear_rec( Dar_LibObj(s_DarLib, pObj->Fan0), pCounter );
+    Dar_LibBuildClear_rec( Dar_LibObj(s_DarLib, pObj->Fan1), pCounter );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reconstructs the best cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Dar_LibBuildBest_rec( Dar_Man_t * p, Dar_LibObj_t * pObj )
+{
+    Aig_Obj_t * pFanin0, * pFanin1;
+    Dar_LibDat_t * pData = s_DarLib->pDatas + pObj->Num;
+    if ( pData->pFunc )
+        return pData->pFunc;
+    pFanin0 = Dar_LibBuildBest_rec( p, Dar_LibObj(s_DarLib, pObj->Fan0) );
+    pFanin1 = Dar_LibBuildBest_rec( p, Dar_LibObj(s_DarLib, pObj->Fan1) );
+    pFanin0 = Aig_NotCond( pFanin0, pObj->fCompl0 );
+    pFanin1 = Aig_NotCond( pFanin1, pObj->fCompl1 );
+    pData->pFunc = Aig_And( p->pAig, pFanin0, pFanin1 );
+//    assert( pData->Level == (int)Aig_Regular(pData->pFunc)->Level );
+    return pData->pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reconstructs the best cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Dar_LibBuildBest( Dar_Man_t * p )
+{
+    int i, Counter = 4;
+    for ( i = 0; i < Vec_PtrSize(p->vLeavesBest); i++ )
+        s_DarLib->pDatas[i].pFunc = Vec_PtrEntry( p->vLeavesBest, i );
+    Dar_LibBuildClear_rec( Dar_LibObj(s_DarLib, p->OutBest), &Counter );
+    return Dar_LibBuildBest_rec( p, Dar_LibObj(s_DarLib, p->OutBest) );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darMan.c b/abc70930/src/aig/dar/darMan.c
new file mode 100644
index 00000000..0a5a36b1
--- /dev/null
+++ b/abc70930/src/aig/dar/darMan.c
@@ -0,0 +1,133 @@
+/**CFile****************************************************************
+
+  FileName    [darMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [AIG manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darMan.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dar_Man_t * Dar_ManStart( Aig_Man_t * pAig, Dar_RwrPar_t * pPars )
+{
+    Dar_Man_t * p;
+    // start the manager
+    p = ALLOC( Dar_Man_t, 1 );
+    memset( p, 0, sizeof(Dar_Man_t) );
+    p->pPars = pPars;
+    p->pAig  = pAig;
+    // prepare the internal memory manager
+    p->pMemCuts = Aig_MmFixedStart( p->pPars->nCutsMax * sizeof(Dar_Cut_t), 1024 );
+    // other data
+    p->vLeavesBest = Vec_PtrAlloc( 4 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManStop( Dar_Man_t * p )
+{
+    if ( p->pPars->fVerbose )
+        Dar_ManPrintStats( p );
+    if ( p->pMemCuts )
+        Aig_MmFixedStop( p->pMemCuts, 0 );
+    if ( p->vLeavesBest ) 
+        Vec_PtrFree( p->vLeavesBest );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManPrintStats( Dar_Man_t * p )
+{
+    unsigned pCanons[222];
+    int Gain, i;
+    extern void Kit_DsdPrintFromTruth( unsigned * pTruth, int nVars );
+
+    Gain = p->nNodesInit - Aig_ManNodeNum(p->pAig);
+    printf( "Tried = %8d. Beg = %8d. End = %8d. Gain = %6d. (%6.2f %%).  Cut mem = %d Mb\n", 
+        p->nNodesTried, p->nNodesInit, Aig_ManNodeNum(p->pAig), Gain, 100.0*Gain/p->nNodesInit, p->nCutMemUsed );
+    printf( "Cuts = %8d. Tried = %8d. Used = %8d. Bad = %5d. Skipped = %5d. Ave = %.2f.\n", 
+        p->nCutsAll, p->nCutsTried, p->nCutsUsed, p->nCutsBad, p->nCutsSkipped,
+        (float)p->nCutsUsed/Aig_ManNodeNum(p->pAig) );
+
+    printf( "Bufs = %5d. BufMax = %5d. BufReplace = %6d. BufFix = %6d.  Levels = %4d.\n", 
+        Aig_ManBufNum(p->pAig), p->pAig->nBufMax, p->pAig->nBufReplaces, p->pAig->nBufFixes, Aig_ManLevels(p->pAig) );
+    PRT( "Cuts  ", p->timeCuts );
+    PRT( "Eval  ", p->timeEval );
+    PRT( "Other ", p->timeOther );
+    PRT( "TOTAL ", p->timeTotal );
+
+    if ( !p->pPars->fVeryVerbose )
+        return;
+    Dar_LibReturnCanonicals( pCanons );
+    for ( i = 0; i < 222; i++ )
+    {
+        if ( p->ClassGains[i] == 0 && p->ClassTimes[i] == 0 )
+            continue;
+        printf( "%3d : ", i );
+        printf( "G = %6d (%5.2f %%)  ", p->ClassGains[i], Gain? 100.0*p->ClassGains[i]/Gain : 0.0 );
+        printf( "S = %8d (%5.2f %%)  ", p->ClassSubgs[i], p->nTotalSubgs? 100.0*p->ClassSubgs[i]/p->nTotalSubgs : 0.0 );
+        printf( "R = %7d   ", p->ClassGains[i]? p->ClassSubgs[i]/p->ClassGains[i] : 9999999 );
+//        Kit_DsdPrintFromTruth( pCanons + i, 4 );
+//        PRTP( "T", p->ClassTimes[i], p->timeEval );
+        printf( "\n" );
+    }
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darPrec.c b/abc70930/src/aig/dar/darPrec.c
new file mode 100644
index 00000000..8c3a4ce3
--- /dev/null
+++ b/abc70930/src/aig/dar/darPrec.c
@@ -0,0 +1,387 @@
+/**CFile****************************************************************
+
+  FileName    [darPrec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Truth table precomputation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darPrec.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocated one-memory-chunk array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char ** Dar_ArrayAlloc( int nCols, int nRows, int Size )
+{
+    char ** pRes;
+    char * pBuffer;
+    int i;
+    assert( nCols > 0 && nRows > 0 && Size > 0 );
+    pBuffer = ALLOC( char, nCols * (sizeof(void *) + nRows * Size) );
+    pRes = (char **)pBuffer;
+    pRes[0] = pBuffer + nCols * sizeof(void *);
+    for ( i = 1; i < nCols; i++ )
+        pRes[i] = pRes[0] + i * nRows * Size;
+    return pRes;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Computes the factorial.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Dar_Factorial( int n )
+{
+    int i, Res = 1;
+    for ( i = 1; i <= n; i++ )
+        Res *= i;
+    return Res;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Fills in the array of permutations.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Dar_Permutations_rec( char ** pRes, int nFact, int n, char Array[] )
+{
+    char ** pNext;
+    int nFactNext;
+    int iTemp, iCur, iLast, k;
+
+    if ( n == 1 )
+    {
+        pRes[0][0] = Array[0];
+        return;
+    }
+
+    // get the next factorial
+    nFactNext = nFact / n;
+    // get the last entry
+    iLast = n - 1;
+
+    for ( iCur = 0; iCur < n; iCur++ )
+    {
+        // swap Cur and Last
+        iTemp        = Array[iCur];
+        Array[iCur]  = Array[iLast];
+        Array[iLast] = iTemp;
+
+        // get the pointer to the current section
+        pNext = pRes + (n - 1 - iCur) * nFactNext;
+
+        // set the last entry 
+        for ( k = 0; k < nFactNext; k++ )
+            pNext[k][iLast] = Array[iLast];
+
+        // call recursively for this part
+        Dar_Permutations_rec( pNext, nFactNext, n - 1, Array );
+
+        // swap them back
+        iTemp        = Array[iCur];
+        Array[iCur]  = Array[iLast];
+        Array[iLast] = iTemp;
+    }
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Computes the set of all permutations.]
+
+  Description [The number of permutations in the array is n!. The number of
+  entries in each permutation is n. Therefore, the resulting array is a 
+  two-dimentional array of the size: n! x n. To free the resulting array,
+  call free() on the pointer returned by this procedure.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+char ** Dar_Permutations( int n )
+{
+    char Array[50];
+    char ** pRes;
+    int nFact, i;
+    // allocate memory
+    nFact = Dar_Factorial( n );
+    pRes  = Dar_ArrayAlloc( nFact, n, sizeof(char) );
+    // fill in the permutations
+    for ( i = 0; i < n; i++ )
+        Array[i] = i;
+    Dar_Permutations_rec( pRes, nFact, n, Array );
+    // print the permutations
+/*
+    {
+    int i, k;
+    for ( i = 0; i < nFact; i++ )
+    {
+        printf( "{" );
+        for ( k = 0; k < n; k++ )
+            printf( " %d", pRes[i][k] );
+        printf( " }\n" );
+    }
+    }
+*/
+    return pRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Permutes the given vector of minterms.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_TruthPermute_int( int * pMints, int nMints, char * pPerm, int nVars, int * pMintsP )
+{
+    int m, v;
+    // clean the storage for minterms
+    memset( pMintsP, 0, sizeof(int) * nMints );
+    // go through minterms and add the variables
+    for ( m = 0; m < nMints; m++ )
+        for ( v = 0; v < nVars; v++ )
+            if ( pMints[m] & (1 << v) )
+                pMintsP[m] |= (1 << pPerm[v]);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Permutes the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Dar_TruthPermute( unsigned Truth, char * pPerms, int nVars, int fReverse )
+{
+    unsigned Result;
+    int * pMints;
+    int * pMintsP;
+    int nMints;
+    int i, m;
+
+    assert( nVars < 6 );
+    nMints  = (1 << nVars);
+    pMints  = ALLOC( int, nMints );
+    pMintsP = ALLOC( int, nMints );
+    for ( i = 0; i < nMints; i++ )
+        pMints[i] = i;
+
+    Dar_TruthPermute_int( pMints, nMints, pPerms, nVars, pMintsP );
+
+    Result = 0;
+    if ( fReverse )
+    {
+        for ( m = 0; m < nMints; m++ )
+            if ( Truth & (1 << pMintsP[m]) )
+                Result |= (1 << m);
+    }
+    else
+    {
+        for ( m = 0; m < nMints; m++ )
+            if ( Truth & (1 << m) )
+                Result |= (1 << pMintsP[m]);
+    }
+
+    free( pMints );
+    free( pMintsP );
+
+    return Result;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Changes the phase of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Dar_TruthPolarize( unsigned uTruth, int Polarity, int nVars )
+{
+    // elementary truth tables
+    static unsigned Signs[5] = {
+        0xAAAAAAAA,    // 1010 1010 1010 1010 1010 1010 1010 1010
+        0xCCCCCCCC,    // 1010 1010 1010 1010 1010 1010 1010 1010
+        0xF0F0F0F0,    // 1111 0000 1111 0000 1111 0000 1111 0000
+        0xFF00FF00,    // 1111 1111 0000 0000 1111 1111 0000 0000
+        0xFFFF0000     // 1111 1111 1111 1111 0000 0000 0000 0000
+    };
+    unsigned uTruthRes, uCof0, uCof1;
+    int nMints, Shift, v;
+    assert( nVars < 6 );
+    nMints = (1 << nVars);
+    uTruthRes = uTruth;
+    for ( v = 0; v < nVars; v++ )
+        if ( Polarity & (1 << v) )
+        {
+            uCof0  = uTruth & ~Signs[v];
+            uCof1  = uTruth &  Signs[v];
+            Shift  = (1 << v);
+            uCof0 <<= Shift;
+            uCof1 >>= Shift;
+            uTruth = uCof0 | uCof1;
+        }
+    return uTruth;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes NPN canonical forms for 4-variable functions.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_Truth4VarNPN( unsigned short ** puCanons, char ** puPhases, char ** puPerms, unsigned char ** puMap )
+{
+    unsigned short * uCanons;
+    unsigned char * uMap;
+    unsigned uTruth, uPhase, uPerm;
+    char ** pPerms4, * uPhases, * uPerms;
+    int nFuncs, nClasses;
+    int i, k;
+
+    nFuncs  = (1 << 16);
+    uCanons = ALLOC( unsigned short, nFuncs );
+    uPhases = ALLOC( char, nFuncs );
+    uPerms  = ALLOC( char, nFuncs );
+    uMap    = ALLOC( unsigned char, nFuncs );
+    memset( uCanons, 0, sizeof(unsigned short) * nFuncs );
+    memset( uPhases, 0, sizeof(char) * nFuncs );
+    memset( uPerms,  0, sizeof(char) * nFuncs );
+    memset( uMap,    0, sizeof(unsigned char) * nFuncs );
+    pPerms4 = Dar_Permutations( 4 );
+
+    nClasses = 1;
+    nFuncs = (1 << 15);
+    for ( uTruth = 1; uTruth < (unsigned)nFuncs; uTruth++ )
+    {
+        // skip already assigned
+        if ( uCanons[uTruth] )
+        {
+            assert( uTruth > uCanons[uTruth] );
+            uMap[~uTruth & 0xFFFF] = uMap[uTruth] = uMap[uCanons[uTruth]];
+            continue;
+        }
+        uMap[uTruth] = nClasses++;
+        for ( i = 0; i < 16; i++ )
+        {
+            uPhase = Dar_TruthPolarize( uTruth, i, 4 );
+            for ( k = 0; k < 24; k++ )
+            {
+                uPerm = Dar_TruthPermute( uPhase, pPerms4[k], 4, 0 );
+                if ( uCanons[uPerm] == 0 )
+                {
+                    uCanons[uPerm] = uTruth;
+                    uPhases[uPerm] = i;
+                    uPerms[uPerm]  = k;
+
+                    uPerm = ~uPerm & 0xFFFF;
+                    uCanons[uPerm] = uTruth;
+                    uPhases[uPerm] = i | 16;
+                    uPerms[uPerm]  = k;
+                }
+                else
+                    assert( uCanons[uPerm] == uTruth );
+            }
+            uPhase = Dar_TruthPolarize( ~uTruth & 0xFFFF, i, 4 ); 
+            for ( k = 0; k < 24; k++ )
+            {
+                uPerm = Dar_TruthPermute( uPhase, pPerms4[k], 4, 0 );
+                if ( uCanons[uPerm] == 0 )
+                {
+                    uCanons[uPerm] = uTruth;
+                    uPhases[uPerm] = i;
+                    uPerms[uPerm]  = k;
+
+                    uPerm = ~uPerm & 0xFFFF;
+                    uCanons[uPerm] = uTruth;
+                    uPhases[uPerm] = i | 16;
+                    uPerms[uPerm]  = k;
+                }
+                else
+                    assert( uCanons[uPerm] == uTruth );
+            }
+        }
+    }
+    uPhases[(1<<16)-1] = 16;
+    assert( nClasses == 222 );
+    free( pPerms4 );
+    if ( puCanons ) 
+        *puCanons = uCanons;
+    else
+        free( uCanons );
+    if ( puPhases ) 
+        *puPhases = uPhases;
+    else
+        free( uPhases );
+    if ( puPerms ) 
+        *puPerms = uPerms;
+    else
+        free( uPerms );
+    if ( puMap ) 
+        *puMap = uMap;
+    else
+        free( uMap );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darRefact.c b/abc70930/src/aig/dar/darRefact.c
new file mode 100644
index 00000000..a765ec30
--- /dev/null
+++ b/abc70930/src/aig/dar/darRefact.c
@@ -0,0 +1,591 @@
+/**CFile****************************************************************
+
+  FileName    [darRefact.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Refactoring.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darRefact.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// the refactoring manager
+typedef struct Ref_Man_t_            Ref_Man_t;
+struct Ref_Man_t_
+{
+    // input data
+    Dar_RefPar_t *   pPars;          // rewriting parameters
+    Aig_Man_t *      pAig;           // AIG manager 
+    // computed cuts
+    Vec_Vec_t *      vCuts;          // the storage for cuts
+    // truth table and ISOP
+    Vec_Ptr_t *      vTruthElem;     // elementary truth tables
+    Vec_Ptr_t *      vTruthStore;    // storage for truth tables
+    Vec_Int_t *      vMemory;        // storage for ISOP
+    Vec_Ptr_t *      vCutNodes;      // storage for internal nodes of the cut
+    // various data members
+    Vec_Ptr_t *      vLeavesBest;    // the best set of leaves
+    Kit_Graph_t *    pGraphBest;     // the best factored form
+    int              GainBest;       // the best gain
+    int              LevelBest;      // the level of node with the best gain
+    // node statistics
+    int              nNodesInit;     // the initial number of nodes
+    int              nNodesTried;    // the number of nodes tried
+    int              nNodesBelow;    // the number of nodes below the level limit
+    int              nNodesExten;    // the number of nodes with extended cut
+    int              nCutsUsed;      // the number of rewriting steps
+    int              nCutsTried;     // the number of cuts tries
+    // timing statistics
+    int              timeCuts;
+    int              timeEval;
+    int              timeOther;
+    int              timeTotal;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the structure with default assignment of parameters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManDefaultRefParams( Dar_RefPar_t * pPars )
+{
+    memset( pPars, 0, sizeof(Dar_RefPar_t) );
+    pPars->nMffcMin     =  2;  // the min MFFC size for which refactoring is used
+    pPars->nLeafMax     = 12;  // the max number of leaves of a cut
+    pPars->nCutsMax     =  5;  // the max number of cuts to consider  
+    pPars->fUpdateLevel =  0;
+    pPars->fUseZeros    =  0;
+    pPars->fVerbose     =  0;
+    pPars->fVeryVerbose =  0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ref_Man_t * Dar_ManRefStart( Aig_Man_t * pAig, Dar_RefPar_t * pPars )
+{
+    Ref_Man_t * p;
+    // start the manager
+    p = ALLOC( Ref_Man_t, 1 );
+    memset( p, 0, sizeof(Ref_Man_t) );
+    p->pAig         = pAig;
+    p->pPars        = pPars;
+    // other data
+    p->vCuts        = Vec_VecStart( pPars->nCutsMax );
+    p->vTruthElem   = Vec_PtrAllocTruthTables( pPars->nLeafMax );
+    p->vTruthStore  = Vec_PtrAllocSimInfo( 256, Kit_TruthWordNum(pPars->nLeafMax) );
+    p->vMemory      = Vec_IntAlloc( 1 << 16 );
+    p->vCutNodes    = Vec_PtrAlloc( 256 );
+    p->vLeavesBest  = Vec_PtrAlloc( pPars->nLeafMax );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints out the statistics of the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManRefPrintStats( Ref_Man_t * p )
+{
+    int Gain = p->nNodesInit - Aig_ManNodeNum(p->pAig);
+    printf( "NodesBeg = %8d. NodesEnd = %8d. Gain = %6d. (%6.2f %%).\n", 
+        p->nNodesInit, Aig_ManNodeNum(p->pAig), Gain, 100.0*Gain/p->nNodesInit );
+    printf( "Tried = %6d. Below = %5d. Extended = %5d.  Used = %5d.  Levels = %4d.\n", 
+        p->nNodesTried, p->nNodesBelow, p->nNodesExten, p->nCutsUsed, Aig_ManLevels(p->pAig) );
+    PRT( "Cuts  ", p->timeCuts );
+    PRT( "Eval  ", p->timeEval );
+    PRT( "Other ", p->timeOther );
+    PRT( "TOTAL ", p->timeTotal );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Dar_ManRefStop( Ref_Man_t * p )
+{
+    if ( p->pPars->fVerbose )
+        Dar_ManRefPrintStats( p );
+    Vec_VecFree( p->vCuts );
+    Vec_PtrFree( p->vTruthElem );
+    Vec_PtrFree( p->vTruthStore );
+    Vec_PtrFree( p->vLeavesBest );
+    Vec_IntFree( p->vMemory );
+    Vec_PtrFree( p->vCutNodes );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ref_ObjComputeCuts( Aig_Man_t * pAig, Aig_Obj_t * pRoot, Vec_Vec_t * vCuts )
+{
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ref_ObjPrint( Aig_Obj_t * pObj )
+{
+    printf( "%d", pObj? Aig_Regular(pObj)->Id : -1 );
+    if ( pObj )
+        printf( "(%d) ", Aig_IsComplement(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of new nodes added when using this graph.]
+
+  Description [AIG nodes for the fanins should be assigned to pNode->pFunc 
+  of the leaves of the graph before calling this procedure. 
+  Returns -1 if the number of nodes and levels exceeded the given limit or 
+  the number of levels exceeded the maximum allowed level.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_RefactTryGraph( Aig_Man_t * pAig, Aig_Obj_t * pRoot, Vec_Ptr_t * vCut, Kit_Graph_t * pGraph, int NodeMax, int LevelMax )
+{
+    Kit_Node_t * pNode, * pNode0, * pNode1;
+    Aig_Obj_t * pAnd, * pAnd0, * pAnd1;
+    int i, Counter, LevelNew, LevelOld;
+    // check for constant function or a literal
+    if ( Kit_GraphIsConst(pGraph) || Kit_GraphIsVar(pGraph) )
+        return 0;
+    // set the levels of the leaves
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+    {
+        pNode->pFunc = Vec_PtrEntry(vCut, i);
+        pNode->Level = Aig_Regular(pNode->pFunc)->Level;
+        assert( Aig_Regular(pNode->pFunc)->Level < (1<<14)-1 );
+    }
+//printf( "Trying:\n" );
+    // compute the AIG size after adding the internal nodes
+    Counter = 0;
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        // get the children of this node
+        pNode0 = Kit_GraphNode( pGraph, pNode->eEdge0.Node );
+        pNode1 = Kit_GraphNode( pGraph, pNode->eEdge1.Node );
+        // get the AIG nodes corresponding to the children 
+        pAnd0 = pNode0->pFunc; 
+        pAnd1 = pNode1->pFunc; 
+        if ( pAnd0 && pAnd1 )
+        {
+            // if they are both present, find the resulting node
+            pAnd0 = Aig_NotCond( pAnd0, pNode->eEdge0.fCompl );
+            pAnd1 = Aig_NotCond( pAnd1, pNode->eEdge1.fCompl );
+            pAnd  = Aig_TableLookupTwo( pAig, pAnd0, pAnd1 );
+            // return -1 if the node is the same as the original root
+            if ( Aig_Regular(pAnd) == pRoot )
+                return -1;
+        }
+        else
+            pAnd = NULL;
+        // count the number of added nodes
+        if ( pAnd == NULL || Aig_ObjIsTravIdCurrent(pAig, Aig_Regular(pAnd)) )
+        {
+            if ( ++Counter > NodeMax )
+                return -1;
+        }
+        // count the number of new levels
+        LevelNew = 1 + AIG_MAX( pNode0->Level, pNode1->Level );
+        if ( pAnd )
+        {
+            if ( Aig_Regular(pAnd) == Aig_ManConst1(pAig) )
+                LevelNew = 0;
+            else if ( Aig_Regular(pAnd) == Aig_Regular(pAnd0) )
+                LevelNew = (int)Aig_Regular(pAnd0)->Level;
+            else if ( Aig_Regular(pAnd) == Aig_Regular(pAnd1) )
+                LevelNew = (int)Aig_Regular(pAnd1)->Level;
+            LevelOld = (int)Aig_Regular(pAnd)->Level;
+//            assert( LevelNew == LevelOld );
+        }
+        if ( LevelNew > LevelMax )
+            return -1;
+        pNode->pFunc = pAnd;
+        pNode->Level = LevelNew;
+/*
+printf( "Checking " );
+Ref_ObjPrint( pAnd0 );
+printf( " and " );
+Ref_ObjPrint( pAnd1 );
+printf( "  Result " );
+Ref_ObjPrint( pNode->pFunc );
+printf( "\n" );
+*/
+    }
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Dar_RefactBuildGraph( Aig_Man_t * pAig, Vec_Ptr_t * vCut, Kit_Graph_t * pGraph )
+{
+    Aig_Obj_t * pAnd0, * pAnd1;
+    Kit_Node_t * pNode = NULL;
+    int i;
+    // check for constant function
+    if ( Kit_GraphIsConst(pGraph) )
+        return Aig_NotCond( Aig_ManConst1(pAig), Kit_GraphIsComplement(pGraph) );
+    // set the leaves
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->pFunc = Vec_PtrEntry(vCut, i);
+    // check for a literal
+    if ( Kit_GraphIsVar(pGraph) )
+        return Aig_NotCond( Kit_GraphVar(pGraph)->pFunc, Kit_GraphIsComplement(pGraph) );
+    // build the AIG nodes corresponding to the AND gates of the graph
+//printf( "Building (current number %d):\n", Aig_ManObjNumMax(pAig) );
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        pAnd0 = Aig_NotCond( Kit_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        pAnd1 = Aig_NotCond( Kit_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        pNode->pFunc = Aig_And( pAig, pAnd0, pAnd1 );
+/*
+printf( "Checking " );
+Ref_ObjPrint( pAnd0 );
+printf( " and " );
+Ref_ObjPrint( pAnd1 );
+printf( "  Result " );
+Ref_ObjPrint( pNode->pFunc );
+printf( "\n" );
+*/
+    }
+    // complement the result if necessary
+    return Aig_NotCond( pNode->pFunc, Kit_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_ManRefactorTryCuts( Ref_Man_t * p, Aig_Obj_t * pObj, int nNodesSaved, int Required )
+{
+    Vec_Ptr_t * vCut;
+    Kit_Graph_t * pGraphCur;
+    int k, RetValue, GainCur, nNodesAdded;
+    unsigned * pTruth;
+
+    p->GainBest = -1;
+    p->pGraphBest = NULL;
+    Vec_VecForEachLevel( p->vCuts, vCut, k )
+    {
+        if ( Vec_PtrSize(vCut) == 0 )
+            continue;
+//        if ( Vec_PtrSize(vCut) != 0 && Vec_PtrSize(Vec_VecEntry(p->vCuts, k+1)) != 0 )
+//            continue;
+
+        p->nCutsTried++;
+        // get the cut nodes
+        Aig_ObjCollectCut( pObj, vCut, p->vCutNodes );
+        // get the truth table
+        pTruth = Aig_ManCutTruth( pObj, vCut, p->vCutNodes, p->vTruthElem, p->vTruthStore );
+        if ( Kit_TruthIsConst0(pTruth, Vec_PtrSize(vCut)) )
+        {
+            p->GainBest = Vec_PtrSize(p->vCutNodes);
+            p->pGraphBest = Kit_GraphCreateConst0();
+            Vec_PtrCopy( p->vLeavesBest, vCut );
+            return p->GainBest;
+        }
+        if ( Kit_TruthIsConst1(pTruth, Vec_PtrSize(vCut)) )
+        {
+            p->GainBest = Vec_PtrSize(p->vCutNodes);
+            p->pGraphBest = Kit_GraphCreateConst1();
+            Vec_PtrCopy( p->vLeavesBest, vCut );
+            return p->GainBest;
+        }
+
+        // try the positive phase
+        RetValue = Kit_TruthIsop( pTruth, Vec_PtrSize(vCut), p->vMemory, 0 );
+        if ( RetValue > -1 )
+        {
+            pGraphCur = Kit_SopFactor( p->vMemory, 0, Vec_PtrSize(vCut), p->vMemory );
+            nNodesAdded = Dar_RefactTryGraph( p->pAig, pObj, vCut, pGraphCur, nNodesSaved - !p->pPars->fUseZeros, Required );
+            if ( nNodesAdded > -1 )
+            {
+                GainCur = nNodesSaved - nNodesAdded;
+                if ( p->GainBest < GainCur || (p->GainBest == GainCur && 
+                    (Kit_GraphIsConst(pGraphCur) || Kit_GraphRootLevel(pGraphCur) < Kit_GraphRootLevel(p->pGraphBest))) )
+                {
+                    p->GainBest = GainCur;
+                    if ( p->pGraphBest )
+                        Kit_GraphFree( p->pGraphBest );
+                    p->pGraphBest = pGraphCur;
+                    Vec_PtrCopy( p->vLeavesBest, vCut );
+                }
+                else
+                    Kit_GraphFree( pGraphCur );
+            }
+            else
+                Kit_GraphFree( pGraphCur );
+        }
+        // try negative phase
+        Kit_TruthNot( pTruth, pTruth, Vec_PtrSize(vCut) );
+        RetValue = Kit_TruthIsop( pTruth, Vec_PtrSize(vCut), p->vMemory, 0 );
+        if ( RetValue > -1 )
+        {
+            pGraphCur = Kit_SopFactor( p->vMemory, 1, Vec_PtrSize(vCut), p->vMemory );
+            nNodesAdded = Dar_RefactTryGraph( p->pAig, pObj, vCut, pGraphCur, nNodesSaved - !p->pPars->fUseZeros, Required );
+            if ( nNodesAdded > -1 )
+            {
+                GainCur = nNodesSaved - nNodesAdded;
+                if ( p->GainBest < GainCur || (p->GainBest == GainCur && 
+                    (Kit_GraphIsConst(pGraphCur) || Kit_GraphRootLevel(pGraphCur) < Kit_GraphRootLevel(p->pGraphBest))) )
+                {
+                    p->GainBest = GainCur;
+                    if ( p->pGraphBest )
+                        Kit_GraphFree( p->pGraphBest );
+                    p->pGraphBest = pGraphCur;
+                    Vec_PtrCopy( p->vLeavesBest, vCut );
+                }
+                else
+                    Kit_GraphFree( pGraphCur );
+            }
+            else
+                Kit_GraphFree( pGraphCur );
+        }
+    }
+    return p->GainBest;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if a non-PI node has nLevelMin or below.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Dar_ObjCutLevelAchieved( Vec_Ptr_t * vCut, int nLevelMin )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Vec_PtrForEachEntry( vCut, pObj, i )
+        if ( !Aig_ObjIsPi(pObj) && (int)pObj->Level <= nLevelMin )
+            return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+ 
+***********************************************************************/
+int Dar_ManRefactor( Aig_Man_t * pAig, Dar_RefPar_t * pPars )
+{
+//    Bar_Progress_t * pProgress;
+    Ref_Man_t * p;
+    Vec_Ptr_t * vCut, * vCut2;
+    Aig_Obj_t * pObj, * pObjNew;
+    int nNodesOld, nNodeBefore, nNodeAfter, nNodesSaved, nNodesSaved2;
+    int i, Required, nLevelMin, clkStart, clk;
+
+    // start the manager
+    p = Dar_ManRefStart( pAig, pPars );
+    // remove dangling nodes
+    Aig_ManCleanup( pAig );
+    // if updating levels is requested, start fanout and timing
+    Aig_ManFanoutStart( pAig );
+    if ( p->pPars->fUpdateLevel )
+        Aig_ManStartReverseLevels( pAig, 0 );
+
+    // resynthesize each node once
+    clkStart = clock();
+    vCut = Vec_VecEntry( p->vCuts, 0 );
+    vCut2 = Vec_VecEntry( p->vCuts, 1 );
+    p->nNodesInit = Aig_ManNodeNum(pAig);
+    nNodesOld = Vec_PtrSize( pAig->vObjs );
+//    pProgress = Bar_ProgressStart( stdout, nNodesOld );
+    Aig_ManForEachObj( pAig, pObj, i )
+    {
+//        Bar_ProgressUpdate( pProgress, i, NULL );
+        if ( !Aig_ObjIsNode(pObj) )
+            continue;
+        if ( i > nNodesOld )
+            break;
+        Vec_VecClear( p->vCuts );
+
+//printf( "\nConsidering node %d.\n", pObj->Id );
+        // get the bounded MFFC size
+clk = clock();
+        nLevelMin = AIG_MAX( 0, Aig_ObjLevel(pObj) - 10 );
+        nNodesSaved = Aig_NodeMffsSupp( pAig, pObj, nLevelMin, vCut );
+        if ( nNodesSaved < p->pPars->nMffcMin ) // too small to consider
+        {
+p->timeCuts += clock() - clk;
+            continue; 
+        }
+        p->nNodesTried++;
+        if ( Vec_PtrSize(vCut) > p->pPars->nLeafMax ) // get one reconv-driven cut
+        {
+            Aig_ManFindCut( pObj, vCut, p->vCutNodes, p->pPars->nLeafMax, 50 );
+            nNodesSaved = Aig_NodeMffsLabelCut( p->pAig, pObj, vCut );
+        }
+        else if ( Vec_PtrSize(vCut) < p->pPars->nLeafMax - 2 && p->pPars->fExtend )
+        {
+            if ( !Dar_ObjCutLevelAchieved(vCut, nLevelMin) )
+            {
+                if ( Aig_NodeMffsExtendCut( pAig, pObj, vCut, vCut2 ) )
+                {
+                    nNodesSaved2 = Aig_NodeMffsLabelCut( p->pAig, pObj, vCut );
+                    assert( nNodesSaved2 == nNodesSaved );
+                }
+                if ( Vec_PtrSize(vCut2) > p->pPars->nLeafMax )
+                    Vec_PtrClear(vCut2);
+                if ( Vec_PtrSize(vCut2) > 0 )
+                {
+                    p->nNodesExten++;
+//                    printf( "%d(%d) ", Vec_PtrSize(vCut), Vec_PtrSize(vCut2) );
+                }
+            }
+            else
+                p->nNodesBelow++;
+        }
+p->timeCuts += clock() - clk;
+
+        // try the cuts
+clk = clock();
+        Required = pAig->vLevelR? Aig_ObjRequiredLevel(pAig, pObj) : AIG_INFINITY;
+        Dar_ManRefactorTryCuts( p, pObj, nNodesSaved, Required );
+p->timeEval += clock() - clk;
+
+        // check the best gain
+        if ( !(p->GainBest > 0 || (p->GainBest == 0 && p->pPars->fUseZeros)) )
+        {
+            if ( p->pGraphBest )
+                Kit_GraphFree( p->pGraphBest );
+            continue;
+        }
+//printf( "\n" );
+
+        // if we end up here, a rewriting step is accepted
+        nNodeBefore = Aig_ManNodeNum( pAig );
+        pObjNew = Dar_RefactBuildGraph( pAig, p->vLeavesBest, p->pGraphBest );
+        assert( (int)Aig_Regular(pObjNew)->Level <= Required );
+        // replace the node
+        Aig_ObjReplace( pAig, pObj, pObjNew, 1, p->pPars->fUpdateLevel );
+        // compare the gains
+        nNodeAfter = Aig_ManNodeNum( pAig );
+        assert( p->GainBest <= nNodeBefore - nNodeAfter );
+        Kit_GraphFree( p->pGraphBest );
+        p->nCutsUsed++;
+//        break;
+    }
+p->timeTotal = clock() - clkStart;
+p->timeOther = p->timeTotal - p->timeCuts - p->timeEval;
+
+//    Bar_ProgressStop( pProgress );
+    // put the nodes into the DFS order and reassign their IDs
+//    Aig_NtkReassignIds( p );
+    // fix the levels
+    Aig_ManFanoutStop( pAig );
+    if ( p->pPars->fUpdateLevel )
+        Aig_ManStopReverseLevels( pAig );
+
+    // stop the rewriting manager
+    Dar_ManRefStop( p );
+    Aig_ManCheckPhase( pAig );
+    if ( !Aig_ManCheck( pAig ) )
+    {
+        printf( "Dar_ManRefactor: The network check has failed.\n" );
+        return 0;
+    }
+    return 1;
+
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darResub.c b/abc70930/src/aig/dar/darResub.c
new file mode 100644
index 00000000..f819934e
--- /dev/null
+++ b/abc70930/src/aig/dar/darResub.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [darResub.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darResub.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/darScript.c b/abc70930/src/aig/dar/darScript.c
new file mode 100644
index 00000000..bd1d7ac1
--- /dev/null
+++ b/abc70930/src/aig/dar/darScript.c
@@ -0,0 +1,392 @@
+/**CFile****************************************************************
+
+  FileName    [darScript.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    [Rewriting scripts.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: darScript.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+//#include "ioa.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs one iteration of AIG rewriting.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManRewriteDefault( Aig_Man_t * pAig )
+{
+    Aig_Man_t * pTemp;
+    Dar_RwrPar_t Pars, * pPars = &Pars;
+    Dar_ManDefaultRwrParams( pPars );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    Dar_ManRewrite( pAig, pPars );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    return pAig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reproduces script "compress2".]
+
+  Description []
+               
+  SideEffects [This procedure does not tighten level during restructuring.]
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManRwsat( Aig_Man_t * pAig, int fBalance, int fVerbose )
+//alias rwsat       "st; rw -l; b -l; rw -l; rf -l"
+{
+    Aig_Man_t * pTemp;
+
+    Dar_RwrPar_t ParsRwr, * pParsRwr = &ParsRwr;
+    Dar_RefPar_t ParsRef, * pParsRef = &ParsRef;
+
+    Dar_ManDefaultRwrParams( pParsRwr );
+    Dar_ManDefaultRefParams( pParsRef );
+
+    pParsRwr->fUpdateLevel = 0;
+    pParsRef->fUpdateLevel = 0;
+
+    pParsRwr->fVerbose = fVerbose;
+    pParsRef->fVerbose = fVerbose;
+
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    
+    // refactor
+    Dar_ManRefactor( pAig, pParsRef );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+
+    // balance
+    if ( fBalance )
+    {
+    pAig = Dar_ManBalance( pTemp = pAig, 0 );
+    Aig_ManStop( pTemp );
+    }
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+
+    return pAig;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Reproduces script "compress".]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManCompress( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose )
+//alias compress2   "b -l; rw -l; rwz -l; b -l; rwz -l; b -l"
+{
+    Aig_Man_t * pTemp;
+
+    Dar_RwrPar_t ParsRwr, * pParsRwr = &ParsRwr;
+    Dar_RefPar_t ParsRef, * pParsRef = &ParsRef;
+
+    Dar_ManDefaultRwrParams( pParsRwr );
+    Dar_ManDefaultRefParams( pParsRef );
+
+    pParsRwr->fUpdateLevel = fUpdateLevel;
+    pParsRef->fUpdateLevel = fUpdateLevel;
+
+    pParsRwr->fVerbose = 0;//fVerbose;
+    pParsRef->fVerbose = 0;//fVerbose;
+
+    pAig = Aig_ManDup( pAig, 0 ); 
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+    if ( fBalance )
+    {
+//    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+//    Aig_ManStop( pTemp );
+//    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    
+    // refactor
+    Dar_ManRefactor( pAig, pParsRef );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+    if ( fBalance )
+    {
+    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+
+    pParsRwr->fUseZeros = 1;
+    pParsRef->fUseZeros = 1;
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    return pAig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reproduces script "compress2".]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManCompress2( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose )
+//alias compress2   "b -l; rw -l; rf -l; b -l; rw -l; rwz -l; b -l; rfz -l; rwz -l; b -l"
+{
+    Aig_Man_t * pTemp;
+
+    Dar_RwrPar_t ParsRwr, * pParsRwr = &ParsRwr;
+    Dar_RefPar_t ParsRef, * pParsRef = &ParsRef;
+
+    Dar_ManDefaultRwrParams( pParsRwr );
+    Dar_ManDefaultRefParams( pParsRef );
+
+    pParsRwr->fUpdateLevel = fUpdateLevel;
+    pParsRef->fUpdateLevel = fUpdateLevel;
+
+    pParsRwr->fVerbose = 0;//fVerbose;
+    pParsRef->fVerbose = 0;//fVerbose;
+
+    pAig = Aig_ManDup( pAig, 0 ); 
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+    if ( fBalance )
+    {
+//    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+//    Aig_ManStop( pTemp );
+//    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+    
+
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    
+    // refactor
+    Dar_ManRefactor( pAig, pParsRef );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+//    if ( fBalance )
+    {
+    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    pParsRwr->fUseZeros = 1;
+    pParsRef->fUseZeros = 1;
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+    if ( fBalance )
+    {
+    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+    
+    // refactor
+    Dar_ManRefactor( pAig, pParsRef );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    
+    // rewrite
+    Dar_ManRewrite( pAig, pParsRwr );
+    pAig = Aig_ManDup( pTemp = pAig, 0 ); 
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+
+    // balance
+    if ( fBalance )
+    {
+    pAig = Dar_ManBalance( pTemp = pAig, fUpdateLevel );
+    Aig_ManStop( pTemp );
+    if ( fVerbose ) Aig_ManPrintStats( pAig );
+    }
+    return pAig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reproduces script "compress2".]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Dar_ManChoiceSynthesis( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose )
+//alias resyn    "b; rw; rwz; b; rwz; b"
+//alias resyn2   "b; rw; rf; b; rw; rwz; b; rfz; rwz; b"
+{
+    Vec_Ptr_t * vAigs;
+    vAigs = Vec_PtrAlloc( 3 );
+    pAig = Aig_ManDup(pAig, 0);
+    Vec_PtrPush( vAigs, pAig );
+    pAig = Dar_ManCompress (pAig, 0, fUpdateLevel, fVerbose);
+    Vec_PtrPush( vAigs, pAig );
+    pAig = Dar_ManCompress2(pAig, fBalance, fUpdateLevel, fVerbose);
+    Vec_PtrPush( vAigs, pAig );
+    return vAigs;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Gives the current ABC network to AIG manager for processing.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+/*
+Vec_Ptr_t * Dar_ManChoiceSynthesisExt()
+{
+    Vec_Ptr_t * vAigs;
+    Aig_Man_t * pMan;
+    vAigs = Vec_PtrAlloc( 3 );
+    pMan = Ioa_ReadAiger( "i10_1.aig", 1 );
+    Vec_PtrPush( vAigs, pMan );
+    pMan = Ioa_ReadAiger( "i10_2.aig", 1 );
+    Vec_PtrPush( vAigs, pMan );
+    pMan = Ioa_ReadAiger( "i10_3.aig", 1 );
+    Vec_PtrPush( vAigs, pMan );
+    return vAigs;
+}
+*/
+
+/**Function*************************************************************
+
+  Synopsis    [Reproduces script "compress2".]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Dar_ManChoice( Aig_Man_t * pAig, int fBalance, int fUpdateLevel, int fVerbose )
+{
+/*
+    Aig_Man_t * pMan, * pTemp;
+    Vec_Ptr_t * vAigs;
+    int i, clk;
+
+clk = clock();
+//    vAigs = Dar_ManChoiceSynthesisExt();
+    vAigs = Dar_ManChoiceSynthesis( pAig, fBalance, fUpdateLevel, fVerbose );
+
+    // swap the first and last network
+    // this should lead to the primary choice being "better" because of synthesis
+    pMan = Vec_PtrPop( vAigs );
+    Vec_PtrPush( vAigs, Vec_PtrEntry(vAigs,0) );
+    Vec_PtrWriteEntry( vAigs, 0, pMan );
+
+if ( fVerbose )
+{
+PRT( "Synthesis time", clock() - clk );
+}
+clk = clock();
+    pMan = Aig_ManChoicePartitioned( vAigs, 300 );
+    Vec_PtrForEachEntry( vAigs, pTemp, i )
+        Aig_ManStop( pTemp );
+    Vec_PtrFree( vAigs );
+if ( fVerbose )
+{
+PRT( "Choicing time ", clock() - clk );
+}
+    return pMan;
+*/
+    return NULL;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/dar_.c b/abc70930/src/aig/dar/dar_.c
new file mode 100644
index 00000000..12fd7d17
--- /dev/null
+++ b/abc70930/src/aig/dar/dar_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [dar_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: dar_.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "darInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/dar/module.make b/abc70930/src/aig/dar/module.make
new file mode 100644
index 00000000..b1b0332c
--- /dev/null
+++ b/abc70930/src/aig/dar/module.make
@@ -0,0 +1,10 @@
+SRC +=    src/aig/dar/darBalance.c \
+    src/aig/dar/darCore.c \
+    src/aig/dar/darCut.c \
+    src/aig/dar/darData.c \
+    src/aig/dar/darLib.c \
+    src/aig/dar/darMan.c \
+    src/aig/dar/darPrec.c \
+    src/aig/dar/darRefact.c \
+    src/aig/dar/darResub.c \
+    src/aig/dar/darScript.c
diff --git a/abc70930/src/aig/deco/deco.h b/abc70930/src/aig/deco/deco.h
new file mode 100644
index 00000000..67126902
--- /dev/null
+++ b/abc70930/src/aig/deco/deco.h
@@ -0,0 +1,703 @@
+/**CFile****************************************************************
+
+  FileName    [deco.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [A simple decomposition tree/node data structure and its APIs.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: deco.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __DEC_H__
+#define __DEC_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Dec_Edge_t_ Dec_Edge_t;
+struct Dec_Edge_t_
+{
+    unsigned          fCompl   :  1;   // the complemented bit
+    unsigned          Node     : 30;   // the decomposition node pointed by the edge
+};
+
+typedef struct Dec_Node_t_ Dec_Node_t;
+struct Dec_Node_t_
+{
+    Dec_Edge_t        eEdge0;          // the left child of the node
+    Dec_Edge_t        eEdge1;          // the right child of the node
+    // other info
+    void *            pFunc;           // the function of the node (BDD or AIG)
+    unsigned          Level    : 14;   // the level of this node in the global AIG
+    // printing info 
+    unsigned          fNodeOr  :  1;   // marks the original OR node
+    unsigned          fCompl0  :  1;   // marks the original complemented edge
+    unsigned          fCompl1  :  1;   // marks the original complemented edge
+    // latch info
+    unsigned          nLat0    :  5;   // the number of latches on the first edge
+    unsigned          nLat1    :  5;   // the number of latches on the second edge
+    unsigned          nLat2    :  5;   // the number of latches on the output edge
+};
+
+typedef struct Dec_Graph_t_ Dec_Graph_t;
+struct Dec_Graph_t_
+{
+    int               fConst;          // marks the constant 1 graph
+    int               nLeaves;         // the number of leaves
+    int               nSize;           // the number of nodes (including the leaves) 
+    int               nCap;            // the number of allocated nodes
+    Dec_Node_t *      pNodes;          // the array of leaves and internal nodes
+    Dec_Edge_t        eRoot;           // the pointer to the topmost node
+};
+
+typedef struct Dec_Man_t_ Dec_Man_t;
+struct Dec_Man_t_
+{
+    void *            pMvcMem;         // memory manager for MVC cover (used for factoring)
+    Vec_Int_t *       vCubes;          // storage for cubes
+    Vec_Int_t *       vLits;           // storage for literals 
+    // precomputation information about 4-variable functions
+    unsigned short *  puCanons;        // canonical forms
+    char *            pPhases;         // canonical phases
+    char *            pPerms;          // canonical permutations
+    unsigned char *   pMap;            // mapping of functions into class numbers
+};
+
+
+////////////////////////////////////////////////////////////////////////
+///                        ITERATORS                                 ///
+////////////////////////////////////////////////////////////////////////
+
+// interator throught the leaves
+#define Dec_GraphForEachLeaf( pGraph, pLeaf, i )                                              \
+    for ( i = 0; (i < (pGraph)->nLeaves) && (((pLeaf) = Dec_GraphNode(pGraph, i)), 1); i++ )
+// interator throught the internal nodes
+#define Dec_GraphForEachNode( pGraph, pAnd, i )                                               \
+    for ( i = (pGraph)->nLeaves; (i < (pGraph)->nSize) && (((pAnd) = Dec_GraphNode(pGraph, i)), 1); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an edge pointing to the node in the given polarity.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_EdgeCreate( int Node, int fCompl )   
+{
+    Dec_Edge_t eEdge = { fCompl, Node }; 
+    return eEdge; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts the edge into unsigned integer.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dec_EdgeToInt( Dec_Edge_t eEdge )   
+{
+    return (eEdge.Node << 1) | eEdge.fCompl; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts unsigned integer into the edge.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_IntToEdge( unsigned Edge )   
+{
+    return Dec_EdgeCreate( Edge >> 1, Edge & 1 ); 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts the edge into unsigned integer.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Dec_EdgeToInt_( Dec_Edge_t eEdge )   
+{
+    return *(unsigned *)&eEdge;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts unsigned integer into the edge.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_IntToEdge_( unsigned Edge )   
+{
+    return *(Dec_Edge_t *)&Edge;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates a graph with the given number of leaves.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Graph_t * Dec_GraphCreate( int nLeaves )   
+{
+    Dec_Graph_t * pGraph;
+    pGraph = ALLOC( Dec_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Dec_Graph_t) );
+    pGraph->nLeaves = nLeaves;
+    pGraph->nSize = nLeaves;
+    pGraph->nCap = 2 * nLeaves + 50;
+    pGraph->pNodes = ALLOC( Dec_Node_t, pGraph->nCap );
+    memset( pGraph->pNodes, 0, sizeof(Dec_Node_t) * pGraph->nSize );
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates constant 0 graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Graph_t * Dec_GraphCreateConst0()   
+{
+    Dec_Graph_t * pGraph;
+    pGraph = ALLOC( Dec_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Dec_Graph_t) );
+    pGraph->fConst = 1;
+    pGraph->eRoot.fCompl = 1;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates constant 1 graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Graph_t * Dec_GraphCreateConst1()   
+{
+    Dec_Graph_t * pGraph;
+    pGraph = ALLOC( Dec_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Dec_Graph_t) );
+    pGraph->fConst = 1;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the literal graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Graph_t * Dec_GraphCreateLeaf( int iLeaf, int nLeaves, int fCompl )   
+{
+    Dec_Graph_t * pGraph;
+    assert( 0 <= iLeaf && iLeaf < nLeaves );
+    pGraph = Dec_GraphCreate( nLeaves );
+    pGraph->eRoot.Node   = iLeaf;
+    pGraph->eRoot.fCompl = fCompl;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates a graph with the given number of leaves.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Dec_GraphFree( Dec_Graph_t * pGraph )   
+{
+    FREE( pGraph->pNodes );
+    free( pGraph );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the graph is a constant.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphIsConst( Dec_Graph_t * pGraph )   
+{
+    return pGraph->fConst;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the graph is constant 0.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphIsConst0( Dec_Graph_t * pGraph )   
+{
+    return pGraph->fConst && pGraph->eRoot.fCompl;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the graph is constant 1.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphIsConst1( Dec_Graph_t * pGraph )   
+{
+    return pGraph->fConst && !pGraph->eRoot.fCompl;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the graph is complemented.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphIsComplement( Dec_Graph_t * pGraph )   
+{
+    return pGraph->eRoot.fCompl;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if the graph is complemented.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Dec_GraphComplement( Dec_Graph_t * pGraph )   
+{
+    pGraph->eRoot.fCompl ^= 1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of leaves.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphLeaveNum( Dec_Graph_t * pGraph )   
+{
+    return pGraph->nLeaves;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of internal nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphNodeNum( Dec_Graph_t * pGraph )   
+{
+    return pGraph->nSize - pGraph->nLeaves;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the pointer to the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Node_t * Dec_GraphNode( Dec_Graph_t * pGraph, int i )   
+{
+    return pGraph->pNodes + i;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the pointer to the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Node_t * Dec_GraphNodeLast( Dec_Graph_t * pGraph )   
+{
+    return pGraph->pNodes + pGraph->nSize - 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of the given node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphNodeInt( Dec_Graph_t * pGraph, Dec_Node_t * pNode )   
+{
+    return pNode - pGraph->pNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check if the graph represents elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphIsVar( Dec_Graph_t * pGraph )   
+{
+    return pGraph->eRoot.Node < (unsigned)pGraph->nLeaves;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check if the graph represents elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphNodeIsVar( Dec_Graph_t * pGraph, Dec_Node_t * pNode )   
+{
+    return Dec_GraphNodeInt(pGraph,pNode) < pGraph->nLeaves;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the elementary variable elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Node_t * Dec_GraphVar( Dec_Graph_t * pGraph )   
+{
+    assert( Dec_GraphIsVar( pGraph ) );
+    return Dec_GraphNode( pGraph, pGraph->eRoot.Node );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of the elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Dec_GraphVarInt( Dec_Graph_t * pGraph )   
+{
+    assert( Dec_GraphIsVar( pGraph ) );
+    return Dec_GraphNodeInt( pGraph, Dec_GraphVar(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the root of the graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Dec_GraphSetRoot( Dec_Graph_t * pGraph, Dec_Edge_t eRoot )   
+{
+    pGraph->eRoot = eRoot;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Appends a new node to the graph.]
+
+  Description [This procedure is meant for internal use.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Node_t * Dec_GraphAppendNode( Dec_Graph_t * pGraph )   
+{
+    Dec_Node_t * pNode;
+    if ( pGraph->nSize == pGraph->nCap )
+    {
+        pGraph->pNodes = REALLOC( Dec_Node_t, pGraph->pNodes, 2 * pGraph->nCap ); 
+        pGraph->nCap   = 2 * pGraph->nCap;
+    }
+    pNode = pGraph->pNodes + pGraph->nSize++;
+    memset( pNode, 0, sizeof(Dec_Node_t) );
+    return pNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an AND node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_GraphAddNodeAnd( Dec_Graph_t * pGraph, Dec_Edge_t eEdge0, Dec_Edge_t eEdge1 )
+{
+    Dec_Node_t * pNode;
+    // get the new node
+    pNode = Dec_GraphAppendNode( pGraph );
+    // set the inputs and other info
+    pNode->eEdge0 = eEdge0;
+    pNode->eEdge1 = eEdge1;
+    pNode->fCompl0 = eEdge0.fCompl;
+    pNode->fCompl1 = eEdge1.fCompl;
+    return Dec_EdgeCreate( pGraph->nSize - 1, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an OR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_GraphAddNodeOr( Dec_Graph_t * pGraph, Dec_Edge_t eEdge0, Dec_Edge_t eEdge1 )
+{
+    Dec_Node_t * pNode;
+    // get the new node
+    pNode = Dec_GraphAppendNode( pGraph );
+    // set the inputs and other info
+    pNode->eEdge0 = eEdge0;
+    pNode->eEdge1 = eEdge1;
+    pNode->fCompl0 = eEdge0.fCompl;
+    pNode->fCompl1 = eEdge1.fCompl;
+    // make adjustments for the OR gate
+    pNode->fNodeOr = 1;
+    pNode->eEdge0.fCompl = !pNode->eEdge0.fCompl;
+    pNode->eEdge1.fCompl = !pNode->eEdge1.fCompl;
+    return Dec_EdgeCreate( pGraph->nSize - 1, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an XOR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_GraphAddNodeXor( Dec_Graph_t * pGraph, Dec_Edge_t eEdge0, Dec_Edge_t eEdge1, int Type )
+{
+    Dec_Edge_t eNode0, eNode1, eNode;
+    if ( Type == 0 )
+    {
+        // derive the first AND
+        eEdge0.fCompl ^= 1;
+        eNode0 = Dec_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        eEdge0.fCompl ^= 1;
+        // derive the second AND
+        eEdge1.fCompl ^= 1;
+        eNode1 = Dec_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the final OR
+        eNode = Dec_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+    }
+    else
+    {
+        // derive the first AND
+        eNode0 = Dec_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the second AND
+        eEdge0.fCompl ^= 1;
+        eEdge1.fCompl ^= 1;
+        eNode1 = Dec_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the final OR
+        eNode = Dec_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+        eNode.fCompl ^= 1;
+    }
+    return eNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an XOR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Dec_Edge_t Dec_GraphAddNodeMux( Dec_Graph_t * pGraph, Dec_Edge_t eEdgeC, Dec_Edge_t eEdgeT, Dec_Edge_t eEdgeE, int Type )
+{
+    Dec_Edge_t eNode0, eNode1, eNode;
+    if ( Type == 0 )
+    {
+        // derive the first AND
+        eNode0 = Dec_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeT );
+        // derive the second AND
+        eEdgeC.fCompl ^= 1;
+        eNode1 = Dec_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeE );
+        // derive the final OR
+        eNode = Dec_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+    }
+    else
+    {
+        // complement the arguments
+        eEdgeT.fCompl ^= 1;
+        eEdgeE.fCompl ^= 1;
+        // derive the first AND
+        eNode0 = Dec_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeT );
+        // derive the second AND
+        eEdgeC.fCompl ^= 1;
+        eNode1 = Dec_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeE );
+        // derive the final OR
+        eNode = Dec_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+        eNode.fCompl ^= 1;
+    }
+    return eNode;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/deco/module.make b/abc70930/src/aig/deco/module.make
new file mode 100644
index 00000000..d6d908e7
--- /dev/null
+++ b/abc70930/src/aig/deco/module.make
@@ -0,0 +1 @@
+SRC += 
diff --git a/abc70930/src/aig/fra/fra.h b/abc70930/src/aig/fra/fra.h
new file mode 100644
index 00000000..210af244
--- /dev/null
+++ b/abc70930/src/aig/fra/fra.h
@@ -0,0 +1,300 @@
+/**CFile****************************************************************
+
+  FileName    [fra.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [[New FRAIG package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fra.h,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __FRA_H__
+#define __FRA_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "vec.h"
+#include "aig.h"
+#include "dar.h"
+#include "satSolver.h"
+#include "bar.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Fra_Par_t_   Fra_Par_t;
+typedef struct Fra_Man_t_   Fra_Man_t;
+typedef struct Fra_Cla_t_   Fra_Cla_t;
+typedef struct Fra_Sml_t_   Fra_Sml_t;
+typedef struct Fra_Bmc_t_   Fra_Bmc_t;
+
+// FRAIG parameters
+struct Fra_Par_t_
+{
+    int              nSimWords;         // the number of words in the simulation info
+    double           dSimSatur;         // the ratio of refined classes when saturation is reached
+    int              fPatScores;        // enables simulation pattern scoring
+    int              MaxScore;          // max score after which resimulation is used
+    double           dActConeRatio;     // the ratio of cone to be bumped
+    double           dActConeBumpMax;   // the largest bump in activity
+    int              fChoicing;         // enables choicing
+    int              fSpeculate;        // use speculative reduction
+    int              fProve;            // prove the miter outputs
+    int              fVerbose;          // verbose output
+    int              fDoSparse;         // skip sparse functions
+    int              fConeBias;         // bias variables in the cone (good for unsat runs)
+    int              nBTLimitNode;      // conflict limit at a node
+    int              nBTLimitMiter;     // conflict limit at an output
+    int              nFramesP;          // the number of timeframes to in the prefix
+    int              nFramesK;          // the number of timeframes to unroll
+    int              nMaxImps;          // the maximum number of implications to consider
+    int              fRewrite;          // use rewriting for constraint reduction
+    int              fLatchCorr;        // computes latch correspondence only
+    int              fUseImps;          // use implications
+    int              fWriteImps;        // record implications
+};
+
+// FRAIG equivalence classes
+struct Fra_Cla_t_
+{
+    Aig_Man_t *      pAig;              // the original AIG manager
+    Aig_Obj_t **     pMemRepr;          // pointers to representatives of each node
+    Vec_Ptr_t *      vClasses;          // equivalence classes
+    Vec_Ptr_t *      vClasses1;         // equivalence class of Const1 node
+    Vec_Ptr_t *      vClassesTemp;      // temporary storage for new classes
+    Aig_Obj_t **     pMemClasses;       // memory allocated for equivalence classes
+    Aig_Obj_t **     pMemClassesFree;   // memory allocated for equivalence classes to be used
+    Vec_Ptr_t *      vClassOld;         // old equivalence class after splitting
+    Vec_Ptr_t *      vClassNew;         // new equivalence class(es) after splitting
+    int              nPairs;            // the number of pairs of nodes
+    int              fRefinement;       // set to 1 when refinement has happened
+    Vec_Int_t *      vImps;             // implications
+    // procedures used for class refinement
+    int (*pFuncNodeHash)     (Aig_Obj_t *, int);         // returns has key of the node
+    int (*pFuncNodeIsConst)  (Aig_Obj_t *);              // returns 1 if the node is a constant
+    int (*pFuncNodesAreEqual)(Aig_Obj_t *, Aig_Obj_t *); // returns 1 if nodes are equal up to a complement
+};
+
+// simulation manager
+struct Fra_Sml_t_
+{
+    Aig_Man_t *      pAig;              // the original AIG manager
+    int              nPref;             // the number of times frames in the prefix
+    int              nFrames;           // the number of times frames 
+    int              nWordsFrame;       // the number of words in each time frame
+    int              nWordsTotal;       // the total number of words at a node
+    int              nWordsPref;        // the number of word in the prefix
+    int              fNonConstOut;      // have seen a non-const-0 output during simulation
+    int              nSimRounds;        // statistics
+    int              timeSim;           // statistics
+    unsigned         pData[0];          // simulation data for the nodes
+};
+
+// FRAIG manager
+struct Fra_Man_t_
+{
+    // high-level data    
+    Fra_Par_t *      pPars;             // parameters governing fraiging
+    // AIG managers
+    Aig_Man_t *      pManAig;           // the starting AIG manager
+    Aig_Man_t *      pManFraig;         // the final AIG manager
+    // mapping AIG into FRAIG
+    int              nFramesAll;        // the number of timeframes used
+    Aig_Obj_t **     pMemFraig;         // memory allocated for points to the fraig nodes
+    int              nSizeAlloc;        // allocated size of the arrays for timeframe nodes
+    // equivalence classes 
+    Fra_Cla_t *      pCla;              // representation of (candidate) equivalent nodes
+    // simulation info
+    Fra_Sml_t *      pSml;              // simulation manager
+    // bounded model checking manager
+    Fra_Bmc_t *      pBmc;
+    // counter example storage
+    int              nPatWords;         // the number of words in the counter example
+    unsigned *       pPatWords;         // the counter example
+    Vec_Int_t *      vCex;
+    // satisfiability solving
+    sat_solver *     pSat;              // SAT solver
+    int              nSatVars;          // the number of variables currently used
+    Vec_Ptr_t *      vPiVars;           // the PIs of the cone used 
+    sint64           nBTLimitGlobal;    // resource limit
+    sint64           nInsLimitGlobal;   // resource limit
+    Vec_Ptr_t **     pMemFanins;        // the arrays of fanins for some FRAIG nodes
+    int *            pMemSatNums;       // the array of SAT numbers for some FRAIG nodes
+    int              nMemAlloc;         // allocated size of the arrays for FRAIG varnums and fanins
+    Vec_Ptr_t *      vTimeouts;         // the nodes, for which equivalence checking timed out
+    // statistics
+    int              nSimRounds;
+    int              nNodesMiter;
+    int              nLitsBeg;
+    int              nLitsEnd;
+    int              nNodesBeg;
+    int              nNodesEnd;
+    int              nRegsBeg;
+    int              nRegsEnd;
+    int              nSatCalls;
+    int              nSatCallsSat;
+    int              nSatCallsUnsat;
+    int              nSatProof;
+    int              nSatFails;
+    int              nSatFailsReal;
+    int              nSpeculs;   
+    int              nChoices;
+    int              nChoicesFake;
+    int              nSatCallsRecent;
+    int              nSatCallsSkipped;
+    // runtime
+    int              timeSim;
+    int              timeTrav;
+    int              timeRwr;
+    int              timeSat;
+    int              timeSatUnsat;
+    int              timeSatSat;
+    int              timeSatFail;
+    int              timeRef;
+    int              timeTotal;
+    int              time1;
+    int              time2;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+static inline unsigned *   Fra_ObjSim( Fra_Sml_t * p, int Id )                           { return p->pData + p->nWordsTotal * Id; }
+static inline unsigned     Fra_ObjRandomSim()                                            { return (rand() << 24) ^ (rand() << 12) ^ rand();                                                   }
+
+static inline Aig_Obj_t *  Fra_ObjFraig( Aig_Obj_t * pObj, int i )                       { return ((Fra_Man_t *)pObj->pData)->pMemFraig[((Fra_Man_t *)pObj->pData)->nFramesAll*pObj->Id + i];  }
+static inline void         Fra_ObjSetFraig( Aig_Obj_t * pObj, int i, Aig_Obj_t * pNode ) { ((Fra_Man_t *)pObj->pData)->pMemFraig[((Fra_Man_t *)pObj->pData)->nFramesAll*pObj->Id + i] = pNode; }
+
+static inline Vec_Ptr_t *  Fra_ObjFaninVec( Aig_Obj_t * pObj )                           { return ((Fra_Man_t *)pObj->pData)->pMemFanins[pObj->Id];      }
+static inline void         Fra_ObjSetFaninVec( Aig_Obj_t * pObj, Vec_Ptr_t * vFanins )   { ((Fra_Man_t *)pObj->pData)->pMemFanins[pObj->Id] = vFanins;   }
+
+static inline int          Fra_ObjSatNum( Aig_Obj_t * pObj )                             { return ((Fra_Man_t *)pObj->pData)->pMemSatNums[pObj->Id];     }
+static inline void         Fra_ObjSetSatNum( Aig_Obj_t * pObj, int Num )                 { ((Fra_Man_t *)pObj->pData)->pMemSatNums[pObj->Id] = Num;      }
+
+static inline Aig_Obj_t *  Fra_ClassObjRepr( Aig_Obj_t * pObj )                          { return ((Fra_Man_t *)pObj->pData)->pCla->pMemRepr[pObj->Id];  }
+static inline void         Fra_ClassObjSetRepr( Aig_Obj_t * pObj, Aig_Obj_t * pNode )    { ((Fra_Man_t *)pObj->pData)->pCla->pMemRepr[pObj->Id] = pNode; }
+
+static inline Aig_Obj_t *  Fra_ObjChild0Fra( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin0(pObj)? Aig_NotCond(Fra_ObjFraig(Aig_ObjFanin0(pObj),i), Aig_ObjFaninC0(pObj)) : NULL;  }
+static inline Aig_Obj_t *  Fra_ObjChild1Fra( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin1(pObj)? Aig_NotCond(Fra_ObjFraig(Aig_ObjFanin1(pObj),i), Aig_ObjFaninC1(pObj)) : NULL;  }
+
+static inline int          Fra_ImpLeft( int Imp )                                        { return Imp & 0xFFFF;         }
+static inline int          Fra_ImpRight( int Imp )                                       { return Imp >> 16;            }
+static inline int          Fra_ImpCreate( int Left, int Right )                          { return (Right << 16) | Left; }
+
+////////////////////////////////////////////////////////////////////////
+///                         ITERATORS                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== fraClass.c ========================================================*/
+extern int                 Fra_BmcNodeIsConst( Aig_Obj_t * pObj );
+extern int                 Fra_BmcNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 );
+extern void                Fra_BmcStop( Fra_Bmc_t * p );
+extern void                Fra_BmcPerform( Fra_Man_t * p, int nPref, int nDepth );
+/*=== fraClass.c ========================================================*/
+extern Fra_Cla_t *         Fra_ClassesStart( Aig_Man_t * pAig );
+extern void                Fra_ClassesStop( Fra_Cla_t * p );
+extern void                Fra_ClassesCopyReprs( Fra_Cla_t * p, Vec_Ptr_t * vFailed );
+extern void                Fra_ClassesPrint( Fra_Cla_t * p, int fVeryVerbose );
+extern void                Fra_ClassesPrepare( Fra_Cla_t * p, int fLatchCorr );
+extern int                 Fra_ClassesRefine( Fra_Cla_t * p );
+extern int                 Fra_ClassesRefine1( Fra_Cla_t * p, int fRefineNewClass, int * pSkipped );
+extern int                 Fra_ClassesCountLits( Fra_Cla_t * p );
+extern int                 Fra_ClassesCountPairs( Fra_Cla_t * p );
+extern void                Fra_ClassesTest( Fra_Cla_t * p, int Id1, int Id2 );
+extern void                Fra_ClassesLatchCorr( Fra_Man_t * p );
+extern void                Fra_ClassesPostprocess( Fra_Cla_t * p );
+extern void                Fra_ClassesSelectRepr( Fra_Cla_t * p );
+extern Aig_Man_t *         Fra_ClassesDeriveAig( Fra_Cla_t * p, int nFramesK );
+/*=== fraCnf.c ========================================================*/
+extern void                Fra_CnfNodeAddToSolver( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew );
+/*=== fraCore.c ========================================================*/
+extern void                Fra_FraigSweep( Fra_Man_t * pManAig );
+extern int                 Fra_FraigMiterStatus( Aig_Man_t * p );
+extern Aig_Man_t *         Fra_FraigPerform( Aig_Man_t * pManAig, Fra_Par_t * pPars );
+extern Aig_Man_t *         Fra_FraigChoice( Aig_Man_t * pManAig, int nConfMax );
+extern Aig_Man_t *         Fra_FraigEquivence( Aig_Man_t * pManAig, int nConfMax );
+/*=== fraImp.c ========================================================*/
+extern Vec_Int_t *         Fra_ImpDerive( Fra_Man_t * p, int nImpMaxLimit, int nImpUseLimit, int fLatchCorr );
+extern void                Fra_ImpAddToSolver( Fra_Man_t * p, Vec_Int_t * vImps, int * pSatVarNums );
+extern int                 Fra_ImpCheckForNode( Fra_Man_t * p, Vec_Int_t * vImps, Aig_Obj_t * pNode, int Pos );
+extern int                 Fra_ImpRefineUsingCex( Fra_Man_t * p, Vec_Int_t * vImps );
+extern void                Fra_ImpCompactArray( Vec_Int_t * vImps );
+extern double              Fra_ImpComputeStateSpaceRatio( Fra_Man_t * p );
+extern int                 Fra_ImpVerifyUsingSimulation( Fra_Man_t * p );
+extern void                Fra_ImpRecordInManager( Fra_Man_t * p, Aig_Man_t * pNew );
+/*=== fraInd.c ========================================================*/
+extern Aig_Man_t *         Fra_FraigInduction( Aig_Man_t * p, int nFramesP, int nFramesK, int nMaxImps, int fRewrite, int fUseImps, int fLatchCorr, int fWriteImps, int fVerbose, int * pnIter );
+/*=== fraLcr.c ========================================================*/
+extern Aig_Man_t *         Fra_FraigLatchCorrespondence( Aig_Man_t * pAig, int nFramesP, int nConfMax, int fProve, int fVerbose, int * pnIter );
+/*=== fraMan.c ========================================================*/
+extern void                Fra_ParamsDefault( Fra_Par_t * pParams );
+extern void                Fra_ParamsDefaultSeq( Fra_Par_t * pParams );
+extern Fra_Man_t *         Fra_ManStart( Aig_Man_t * pManAig, Fra_Par_t * pParams );
+extern void                Fra_ManClean( Fra_Man_t * p, int nNodesMax );
+extern Aig_Man_t *         Fra_ManPrepareComb( Fra_Man_t * p );
+extern void                Fra_ManFinalizeComb( Fra_Man_t * p );
+extern void                Fra_ManStop( Fra_Man_t * p );
+extern void                Fra_ManPrint( Fra_Man_t * p );
+/*=== fraSat.c ========================================================*/
+extern int                 Fra_NodesAreEquiv( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew );
+extern int                 Fra_NodesAreImp( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew, int fComplL, int fComplR );
+extern int                 Fra_NodeIsConst( Fra_Man_t * p, Aig_Obj_t * pNew );
+/*=== fraSec.c ========================================================*/
+extern int                 Fra_FraigSec( Aig_Man_t * p, int nFrames, int fRetimeFirst, int fVerbose, int fVeryVerbose );
+/*=== fraSim.c ========================================================*/
+extern int                 Fra_SmlNodeHash( Aig_Obj_t * pObj, int nTableSize );
+extern int                 Fra_SmlNodeIsConst( Aig_Obj_t * pObj );
+extern int                 Fra_SmlNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 );
+extern int                 Fra_SmlNodeNotEquWeight( Fra_Sml_t * p, int Left, int Right );
+extern int                 Fra_SmlCheckOutput( Fra_Man_t * p );
+extern void                Fra_SmlSavePattern( Fra_Man_t * p );
+extern void                Fra_SmlSimulate( Fra_Man_t * p, int fInit );
+extern void                Fra_SmlResimulate( Fra_Man_t * p );
+extern Fra_Sml_t *         Fra_SmlStart( Aig_Man_t * pAig, int nPref, int nFrames, int nWordsFrame );
+extern void                Fra_SmlStop( Fra_Sml_t * p );
+extern Fra_Sml_t *         Fra_SmlSimulateSeq( Aig_Man_t * pAig, int nPref, int nFrames, int nWords );
+extern Fra_Sml_t *         Fra_SmlSimulateComb( Aig_Man_t * pAig, int nWords );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/fra/fraBmc.c b/abc70930/src/aig/fra/fraBmc.c
new file mode 100644
index 00000000..1140f3a4
--- /dev/null
+++ b/abc70930/src/aig/fra/fraBmc.c
@@ -0,0 +1,362 @@
+/**CFile****************************************************************
+
+  FileName    [fraBmc.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Bounded model checking.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraBmc.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// simulation manager
+struct Fra_Bmc_t_
+{
+    // parameters
+    int              nPref;             // the size of the prefix
+    int              nDepth;            // the depth of the frames
+    int              nFramesAll;        // the total number of timeframes
+    // implications to be filtered
+    Vec_Int_t *      vImps;
+    // AIG managers
+    Aig_Man_t *      pAig;              // the original AIG manager
+    Aig_Man_t *      pAigFrames;        // initialized timeframes
+    Aig_Man_t *      pAigFraig;         // the fraiged initialized timeframes
+    // mapping of nodes
+    Aig_Obj_t **     pObjToFrames;      // mapping of the original node into frames
+    Aig_Obj_t **     pObjToFraig;       // mapping of the frames node into fraig
+};
+
+static inline Aig_Obj_t *  Bmc_ObjFrames( Aig_Obj_t * pObj, int i )                       { return ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFrames[((Fra_Man_t *)pObj->pData)->pBmc->nFramesAll*pObj->Id + i];  }
+static inline void         Bmc_ObjSetFrames( Aig_Obj_t * pObj, int i, Aig_Obj_t * pNode ) { ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFrames[((Fra_Man_t *)pObj->pData)->pBmc->nFramesAll*pObj->Id + i] = pNode; }
+
+static inline Aig_Obj_t *  Bmc_ObjFraig( Aig_Obj_t * pObj )                               { return ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFraig[pObj->Id];  }
+static inline void         Bmc_ObjSetFraig( Aig_Obj_t * pObj, Aig_Obj_t * pNode )         { ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFraig[pObj->Id] = pNode; }
+
+static inline Aig_Obj_t *  Bmc_ObjChild0Frames( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin0(pObj)? Aig_NotCond(Bmc_ObjFrames(Aig_ObjFanin0(pObj),i), Aig_ObjFaninC0(pObj)) : NULL;  }
+static inline Aig_Obj_t *  Bmc_ObjChild1Frames( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin1(pObj)? Aig_NotCond(Bmc_ObjFrames(Aig_ObjFanin1(pObj),i), Aig_ObjFaninC1(pObj)) : NULL;  }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the nodes are equivalent.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_BmcNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 )
+{
+    Fra_Man_t * p = pObj0->pData;
+    Aig_Obj_t * pObjFrames0, * pObjFrames1;
+    Aig_Obj_t * pObjFraig0, * pObjFraig1;
+    int i;
+    for ( i = p->pBmc->nPref; i < p->pBmc->nFramesAll; i++ )
+    {
+        pObjFrames0 = Aig_Regular( Bmc_ObjFrames(pObj0, i) );
+        pObjFrames1 = Aig_Regular( Bmc_ObjFrames(pObj1, i) );
+        if ( pObjFrames0 == pObjFrames1 )
+            continue;
+        pObjFraig0 = Aig_Regular( Bmc_ObjFraig(pObjFrames0) );
+        pObjFraig1 = Aig_Regular( Bmc_ObjFraig(pObjFrames1) );
+        if ( pObjFraig0 != pObjFraig1 )
+            return 0;
+    }
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the node is costant.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_BmcNodeIsConst( Aig_Obj_t * pObj )
+{
+    Fra_Man_t * p = pObj->pData;
+    return Fra_BmcNodesAreEqual( pObj, Aig_ManConst1(p->pManAig) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Refines implications using BMC.]
+
+  Description [The input is the combinational FRAIG manager,
+  which is used to FRAIG the timeframes. ]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_BmcFilterImplications( Fra_Man_t * p, Fra_Bmc_t * pBmc )
+{
+    Aig_Obj_t * pLeft, * pRight;
+    Aig_Obj_t * pLeftT, * pRightT;
+    Aig_Obj_t * pLeftF, * pRightF;
+    int i, f, Imp, Left, Right;
+    int fComplL, fComplR;
+    assert( p->nFramesAll == 1 );
+    assert( p->pManAig == pBmc->pAigFrames );
+    Vec_IntForEachEntry( pBmc->vImps, Imp, i )
+    {
+        if ( Imp == 0 )
+            continue;
+        Left  = Fra_ImpLeft(Imp);
+        Right = Fra_ImpRight(Imp);
+        // get the corresponding nodes
+        pLeft  = Aig_ManObj( pBmc->pAig, Left );
+        pRight = Aig_ManObj( pBmc->pAig, Right );
+        // iterate through the timeframes
+        for ( f = pBmc->nPref; f < pBmc->nFramesAll; f++ )
+        {
+            // get timeframe nodes
+            pLeftT  = Bmc_ObjFrames( pLeft, f );
+            pRightT = Bmc_ObjFrames( pRight, f );
+            // get the corresponding FRAIG nodes
+            pLeftF  = Fra_ObjFraig( Aig_Regular(pLeftT), 0 );
+            pRightF = Fra_ObjFraig( Aig_Regular(pRightT), 0 );
+            // get the complemented attributes
+            fComplL = pLeft->fPhase ^ Aig_IsComplement(pLeftF) ^ Aig_IsComplement(pLeftT);
+            fComplR = pRight->fPhase ^ Aig_IsComplement(pRightF) ^ Aig_IsComplement(pRightT);
+            // check equality
+            if ( Aig_Regular(pLeftF) == Aig_Regular(pRightF) )
+            {
+                if ( fComplL == fComplR ) // x => x  - always true
+                    continue;
+                assert( fComplL != fComplR );
+                // consider 4 possibilities:
+                // NOT(1) => 1    or   0 => 1  - always true
+                // 1 => NOT(1)    or   1 => 0  - never true
+                // NOT(x) => x    or   x       - not always true
+                // x => NOT(x)    or   NOT(x)  - not always true
+                if ( Aig_ObjIsConst1(Aig_Regular(pLeftF)) && fComplL ) // proved implication
+                    continue;
+                // disproved implication
+                Vec_IntWriteEntry( pBmc->vImps, i, 0 ); 
+                break;
+            }
+            // check the implication 
+            if ( Fra_NodesAreImp( p, Aig_Regular(pLeftF), Aig_Regular(pRightF), fComplL, fComplR ) != 1 )
+            {
+                Vec_IntWriteEntry( pBmc->vImps, i, 0 );
+                break;
+            }
+        }
+    }
+    Fra_ImpCompactArray( pBmc->vImps );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the BMC manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Bmc_t * Fra_BmcStart( Aig_Man_t * pAig, int nPref, int nDepth )
+{
+    Fra_Bmc_t * p;
+    p = ALLOC( Fra_Bmc_t, 1 );
+    memset( p, 0, sizeof(Fra_Bmc_t) );
+    p->pAig = pAig;
+    p->nPref = nPref;
+    p->nDepth = nDepth;
+    p->nFramesAll = nPref + nDepth;
+    p->pObjToFrames  = ALLOC( Aig_Obj_t *, p->nFramesAll * Aig_ManObjNumMax(pAig) );
+    memset( p->pObjToFrames, 0, sizeof(Aig_Obj_t *) * p->nFramesAll * Aig_ManObjNumMax(pAig) );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the BMC manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_BmcStop( Fra_Bmc_t * p )
+{
+    Aig_ManStop( p->pAigFrames );
+    Aig_ManStop( p->pAigFraig );
+    free( p->pObjToFrames );
+    free( p->pObjToFraig );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs initialized timeframes of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_BmcFrames( Fra_Bmc_t * p )
+{
+    Aig_Man_t * pAigFrames;
+    Aig_Obj_t * pObj, * pObjNew;
+    Aig_Obj_t ** pLatches;
+    int i, k, f;
+
+    // start the fraig package
+    pAigFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->nFramesAll );
+    pAigFrames->pName = Aig_UtilStrsav( p->pAig->pName );
+    // create PI nodes for the frames
+    for ( f = 0; f < p->nFramesAll; f++ )
+        Bmc_ObjSetFrames( Aig_ManConst1(p->pAig), f, Aig_ManConst1(pAigFrames) );
+    for ( f = 0; f < p->nFramesAll; f++ )
+        Aig_ManForEachPiSeq( p->pAig, pObj, i )
+            Bmc_ObjSetFrames( pObj, f, Aig_ObjCreatePi(pAigFrames) );
+    // set initial state for the latches
+    Aig_ManForEachLoSeq( p->pAig, pObj, i )
+        Bmc_ObjSetFrames( pObj, 0, Aig_ManConst0(pAigFrames) );
+
+    // add timeframes
+    pLatches = ALLOC( Aig_Obj_t *, Aig_ManRegNum(p->pAig) );
+    for ( f = 0; f < p->nFramesAll; f++ )
+    {
+        // add internal nodes of this frame
+        Aig_ManForEachNode( p->pAig, pObj, i )
+        {
+            pObjNew = Aig_And( pAigFrames, Bmc_ObjChild0Frames(pObj,f), Bmc_ObjChild1Frames(pObj,f) );
+            Bmc_ObjSetFrames( pObj, f, pObjNew );
+        }
+        if ( f == p->nFramesAll - 1 )
+            break;
+        // save the latch input values
+        k = 0;
+        Aig_ManForEachLiSeq( p->pAig, pObj, i )
+            pLatches[k++] = Bmc_ObjChild0Frames(pObj,f);
+        assert( k == Aig_ManRegNum(p->pAig) );
+        // insert them to the latch output values
+        k = 0;
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Bmc_ObjSetFrames( pObj, f+1, pLatches[k++] );
+        assert( k == Aig_ManRegNum(p->pAig) );
+    }
+    free( pLatches );
+    // add POs to all the dangling nodes
+    Aig_ManForEachObj( pAigFrames, pObjNew, i )
+        if ( Aig_ObjIsNode(pObjNew) && pObjNew->nRefs == 0 )
+            Aig_ObjCreatePo( pAigFrames, pObjNew );
+
+    // return the new manager
+    return pAigFrames;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BMC for the given AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_BmcPerform( Fra_Man_t * p, int nPref, int nDepth )
+{
+    Aig_Obj_t * pObj;
+    int i, nImpsOld, clk = clock();
+    assert( p->pBmc == NULL );
+    // derive and fraig the frames
+    p->pBmc = Fra_BmcStart( p->pManAig, nPref, nDepth );
+    p->pBmc->pAigFrames = Fra_BmcFrames( p->pBmc );
+    // if implications are present, configure the AIG manager to check them
+    if ( p->pCla->vImps )
+    {
+        p->pBmc->pAigFrames->pImpFunc = Fra_BmcFilterImplications;
+        p->pBmc->pAigFrames->pImpData = p->pBmc;
+        p->pBmc->vImps = p->pCla->vImps;
+        nImpsOld = Vec_IntSize(p->pCla->vImps);
+    } 
+    p->pBmc->pAigFraig = Fra_FraigEquivence( p->pBmc->pAigFrames, 1000000 );
+    p->pBmc->pObjToFraig = p->pBmc->pAigFrames->pObjCopies;
+    p->pBmc->pAigFrames->pObjCopies = NULL;
+    // annotate frames nodes with pointers to the manager
+    Aig_ManForEachObj( p->pBmc->pAigFrames, pObj, i )
+        pObj->pData = p;
+    // report the results
+    if ( p->pPars->fVerbose )
+    {
+        printf( "Original AIG = %d. Init %d frames = %d. Fraig = %d.  ", 
+            Aig_ManNodeNum(p->pBmc->pAig), p->pBmc->nFramesAll, 
+            Aig_ManNodeNum(p->pBmc->pAigFrames), Aig_ManNodeNum(p->pBmc->pAigFraig) );
+        PRT( "Time", clock() - clk );
+        printf( "Before BMC: " );  
+//        Fra_ClassesPrint( p->pCla, 0 );
+        printf( "Const = %5d. Class = %5d. Lit = %5d. ", 
+            Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
+        if ( p->pCla->vImps )
+            printf( "Imp = %5d. ", nImpsOld );
+        printf( "\n" );
+    }
+    // refine the classes
+    p->pCla->pFuncNodeIsConst   = Fra_BmcNodeIsConst;
+    p->pCla->pFuncNodesAreEqual = Fra_BmcNodesAreEqual;
+    Fra_ClassesRefine( p->pCla );
+    Fra_ClassesRefine1( p->pCla, 1, NULL );
+    p->pCla->pFuncNodeIsConst   = Fra_SmlNodeIsConst;
+    p->pCla->pFuncNodesAreEqual = Fra_SmlNodesAreEqual;
+    // report the results
+    if ( p->pPars->fVerbose )
+    {
+        printf( "After  BMC: " );  
+//        Fra_ClassesPrint( p->pCla, 0 );
+        printf( "Const = %5d. Class = %5d. Lit = %5d. ", 
+            Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
+        if ( p->pCla->vImps )
+            printf( "Imp = %5d. ", Vec_IntSize(p->pCla->vImps) );
+        printf( "\n" );
+    }
+    // free the BMC manager
+    Fra_BmcStop( p->pBmc );  
+    p->pBmc = NULL;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraCec.c b/abc70930/src/aig/fra/fraCec.c
new file mode 100644
index 00000000..e705f4fc
--- /dev/null
+++ b/abc70930/src/aig/fra/fraCec.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [fraCec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [CEC engined based on fraiging.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraCec.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraClass.c b/abc70930/src/aig/fra/fraClass.c
new file mode 100644
index 00000000..a03fa6e5
--- /dev/null
+++ b/abc70930/src/aig/fra/fraClass.c
@@ -0,0 +1,854 @@
+/**CFile****************************************************************
+
+  FileName    [fraClass.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraClass.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+/*
+    The candidate equivalence classes are stored as a vector of pointers 
+    to the array of pointers to the nodes in each class.
+    The first node of the class is its representative node.
+    The representative has the smallest topological order among the class nodes.
+    The nodes inside each class are ordered according to their topological order.
+    The classes are ordered according to the topological order of their representatives.
+    The array of pointers to the class nodes is terminated with a NULL pointer.
+    To enable dynamic addition of new classes (during class refinement),
+    each array has at least as many NULLs in the end, as there are nodes in the class.
+*/
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline Aig_Obj_t *  Fra_ObjNext( Aig_Obj_t ** ppNexts, Aig_Obj_t * pObj )                       { return ppNexts[pObj->Id];  }
+static inline void         Fra_ObjSetNext( Aig_Obj_t ** ppNexts, Aig_Obj_t * pObj, Aig_Obj_t * pNext ) { ppNexts[pObj->Id] = pNext; }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts representation of equivalence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Cla_t * Fra_ClassesStart( Aig_Man_t * pAig )
+{
+    Fra_Cla_t * p;
+    p = ALLOC( Fra_Cla_t, 1 );
+    memset( p, 0, sizeof(Fra_Cla_t) );
+    p->pAig = pAig;
+    p->pMemRepr  = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(pAig) );
+    memset( p->pMemRepr, 0, sizeof(Aig_Obj_t *) * Aig_ManObjNumMax(pAig) );
+    p->vClasses     = Vec_PtrAlloc( 100 );
+    p->vClasses1    = Vec_PtrAlloc( 100 );
+    p->vClassesTemp = Vec_PtrAlloc( 100 );
+    p->vClassOld    = Vec_PtrAlloc( 100 );
+    p->vClassNew    = Vec_PtrAlloc( 100 );
+    p->pFuncNodeHash      = Fra_SmlNodeHash;
+    p->pFuncNodeIsConst   = Fra_SmlNodeIsConst;
+    p->pFuncNodesAreEqual = Fra_SmlNodesAreEqual;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stop representation of equivalence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesStop( Fra_Cla_t * p )
+{
+    FREE( p->pMemClasses );
+    FREE( p->pMemRepr );
+    if ( p->vClassesTemp ) Vec_PtrFree( p->vClassesTemp );
+    if ( p->vClassNew )    Vec_PtrFree( p->vClassNew );
+    if ( p->vClassOld )    Vec_PtrFree( p->vClassOld );
+    if ( p->vClasses1 )    Vec_PtrFree( p->vClasses1 );
+    if ( p->vClasses )     Vec_PtrFree( p->vClasses );
+    if ( p->vImps )        Vec_IntFree( p->vImps );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts representation of equivalence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesCopyReprs( Fra_Cla_t * p, Vec_Ptr_t * vFailed )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManReprStart( p->pAig, Aig_ManObjNumMax(p->pAig) );
+    memmove( p->pAig->pReprs, p->pMemRepr, sizeof(Aig_Obj_t *) * Aig_ManObjNumMax(p->pAig) );
+    if ( Vec_PtrSize(p->vClasses1) == 0 && Vec_PtrSize(p->vClasses) == 0 )
+    {
+        Aig_ManForEachObj( p->pAig, pObj, i )
+        {
+            if ( p->pAig->pReprs[i] != NULL )
+                printf( "Classes are not cleared!\n" );
+            assert( p->pAig->pReprs[i] == NULL );
+        }
+    }
+    if ( vFailed )
+        Vec_PtrForEachEntry( vFailed, pObj, i )
+            p->pAig->pReprs[pObj->Id] = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints simulation classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ClassCount( Aig_Obj_t ** pClass )
+{
+    Aig_Obj_t * pTemp;
+    int i;
+    for ( i = 0; pTemp = pClass[i]; i++ );
+    return i;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of literals.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ClassesCountLits( Fra_Cla_t * p )
+{
+    Aig_Obj_t ** pClass;
+    int i, nNodes, nLits = 0;
+    nLits = Vec_PtrSize( p->vClasses1 );
+    Vec_PtrForEachEntry( p->vClasses, pClass, i )
+    {
+        nNodes = Fra_ClassCount( pClass );
+        assert( nNodes > 1 );
+        nLits += nNodes - 1;
+    }
+    return nLits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of pairs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ClassesCountPairs( Fra_Cla_t * p )
+{
+    Aig_Obj_t ** pClass;
+    int i, nNodes, nPairs = 0;
+    Vec_PtrForEachEntry( p->vClasses, pClass, i )
+    {
+        nNodes = Fra_ClassCount( pClass );
+        assert( nNodes > 1 );
+        nPairs += nNodes * (nNodes - 1) / 2;
+    }
+    return nPairs;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints simulation classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_PrintClass( Aig_Obj_t ** pClass )
+{
+    Aig_Obj_t * pTemp;
+    int i;
+    for ( i = 1; pTemp = pClass[i]; i++ )
+        assert( Fra_ClassObjRepr(pTemp) == pClass[0] );
+    printf( "{ " );
+    for ( i = 0; pTemp = pClass[i]; i++ )
+        printf( "%d(%d) ", pTemp->Id, pTemp->Level );
+    printf( "}\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints simulation classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesPrint( Fra_Cla_t * p, int fVeryVerbose )
+{
+    Aig_Obj_t ** pClass;
+    Aig_Obj_t * pObj;
+    int i;
+
+    printf( "Const = %5d. Class = %5d. Lit = %5d. ", 
+        Vec_PtrSize(p->vClasses1), Vec_PtrSize(p->vClasses), Fra_ClassesCountLits(p) );
+    if ( p->vImps && Vec_IntSize(p->vImps) > 0 )
+        printf( "Imp = %5d. ", Vec_IntSize(p->vImps) );
+    printf( "\n" );
+
+    if ( fVeryVerbose )
+    {
+        Vec_PtrForEachEntry( p->vClasses1, pObj, i )
+            assert( Fra_ClassObjRepr(pObj) == Aig_ManConst1(p->pAig) );
+        printf( "Constants { " );
+        Vec_PtrForEachEntry( p->vClasses1, pObj, i )
+            printf( "%d ", pObj->Id );
+        printf( "}\n" );
+        Vec_PtrForEachEntry( p->vClasses, pClass, i )
+        {
+            printf( "%3d (%3d) : ", i, Fra_ClassCount(pClass) );
+            Fra_PrintClass( pClass );
+        }
+        printf( "\n" );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates initial simulation classes.]
+
+  Description [Assumes that simulation info is assigned.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesPrepare( Fra_Cla_t * p, int fLatchCorr )
+{
+    Aig_Obj_t ** ppTable, ** ppNexts;
+    Aig_Obj_t * pObj, * pTemp;
+    int i, k, nTableSize, nEntries, nNodes, iEntry;
+
+    // allocate the hash table hashing simulation info into nodes
+    nTableSize = Aig_PrimeCudd( Aig_ManObjNumMax(p->pAig) );
+    ppTable = ALLOC( Aig_Obj_t *, nTableSize ); 
+    ppNexts = ALLOC( Aig_Obj_t *, nTableSize ); 
+    memset( ppTable, 0, sizeof(Aig_Obj_t *) * nTableSize );
+
+    // add all the nodes to the hash table
+    Vec_PtrClear( p->vClasses1 );
+    Aig_ManForEachObj( p->pAig, pObj, i )
+    {
+        if ( fLatchCorr )
+        {
+            if ( !Aig_ObjIsPi(pObj) )
+                continue;
+        }
+        else
+        {
+            if ( !Aig_ObjIsNode(pObj) && !Aig_ObjIsPi(pObj) )
+                continue;
+            // skip the node with more that the given number of levels
+//            if ( pObj->Level > 3 )
+//                continue;
+        }
+        // hash the node by its simulation info
+        iEntry = p->pFuncNodeHash( pObj, nTableSize );
+        // check if the node belongs to the class of constant 1
+        if ( p->pFuncNodeIsConst( pObj ) )
+        {
+            Vec_PtrPush( p->vClasses1, pObj );
+            Fra_ClassObjSetRepr( pObj, Aig_ManConst1(p->pAig) );
+            continue;
+        }
+        // add the node to the class
+        if ( ppTable[iEntry] == NULL )
+        {
+            ppTable[iEntry] = pObj;
+            Fra_ObjSetNext( ppNexts, pObj, pObj );
+        }
+        else
+        {
+            Fra_ObjSetNext( ppNexts, pObj, Fra_ObjNext(ppNexts,ppTable[iEntry]) );
+            Fra_ObjSetNext( ppNexts, ppTable[iEntry], pObj );
+        }
+    }
+
+    // count the total number of nodes in the non-trivial classes
+    // mark the representative nodes of each equivalence class
+    nEntries = 0;
+    for ( i = 0; i < nTableSize; i++ )
+        if ( ppTable[i] && ppTable[i] != Fra_ObjNext(ppNexts, ppTable[i]) )
+        {
+            for ( pTemp = Fra_ObjNext(ppNexts, ppTable[i]), k = 1; 
+                  pTemp != ppTable[i]; 
+                  pTemp = Fra_ObjNext(ppNexts, pTemp), k++ );
+            assert( k > 1 );
+            nEntries += k;
+            // mark the node
+            assert( ppTable[i]->fMarkA == 0 );
+            ppTable[i]->fMarkA = 1;
+        }
+
+    // allocate room for classes
+    p->pMemClasses = ALLOC( Aig_Obj_t *, 2*(nEntries + Vec_PtrSize(p->vClasses1)) );
+    p->pMemClassesFree = p->pMemClasses + 2*nEntries;
+ 
+    // copy the entries into storage in the topological order
+    Vec_PtrClear( p->vClasses );
+    nEntries = 0;
+    Aig_ManForEachObj( p->pAig, pObj, i )
+    {
+        if ( !Aig_ObjIsNode(pObj) && !Aig_ObjIsPi(pObj) )
+            continue;
+        // skip the nodes that are not representatives of non-trivial classes
+        if ( pObj->fMarkA == 0 )
+            continue;
+        pObj->fMarkA = 0;
+        // add the class of nodes
+        Vec_PtrPush( p->vClasses, p->pMemClasses + 2*nEntries );
+        // count the number of entries in this class
+        for ( pTemp = Fra_ObjNext(ppNexts, pObj), k = 1; 
+              pTemp != pObj; 
+              pTemp = Fra_ObjNext(ppNexts, pTemp), k++ );
+        nNodes = k;
+        assert( nNodes > 1 );
+        // add the nodes to the class in the topological order
+        p->pMemClasses[2*nEntries] = pObj;
+        for ( pTemp = Fra_ObjNext(ppNexts, pObj), k = 1; 
+              pTemp != pObj; 
+              pTemp = Fra_ObjNext(ppNexts, pTemp), k++ )
+        {
+            p->pMemClasses[2*nEntries+nNodes-k] = pTemp;
+            Fra_ClassObjSetRepr( pTemp, pObj );
+        }
+        // add as many empty entries
+        p->pMemClasses[2*nEntries + nNodes] = NULL;
+        // increment the number of entries
+        nEntries += k;
+    }
+    free( ppTable );
+    free( ppNexts );
+    // now it is time to refine the classes
+    Fra_ClassesRefine( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Refines one class using simulation info.]
+
+  Description [Returns the new class if refinement happened.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t ** Fra_RefineClassOne( Fra_Cla_t * p, Aig_Obj_t ** ppClass )
+{
+    Aig_Obj_t * pObj, ** ppThis;
+    int i;
+    assert( ppClass[0] != NULL && ppClass[1] != NULL );
+
+    // check if the class is going to be refined
+    for ( ppThis = ppClass + 1; pObj = *ppThis; ppThis++ )        
+        if ( !p->pFuncNodesAreEqual(ppClass[0], pObj) )
+            break;
+    if ( pObj == NULL )
+        return NULL;
+    // split the class
+    Vec_PtrClear( p->vClassOld );
+    Vec_PtrClear( p->vClassNew );
+    Vec_PtrPush( p->vClassOld, ppClass[0] );
+    for ( ppThis = ppClass + 1; pObj = *ppThis; ppThis++ )        
+        if ( p->pFuncNodesAreEqual(ppClass[0], pObj) )
+            Vec_PtrPush( p->vClassOld, pObj );
+        else
+            Vec_PtrPush( p->vClassNew, pObj );
+/*
+    printf( "Refining class (" );
+    Vec_PtrForEachEntry( p->vClassOld, pObj, i )
+        printf( "%d,", pObj->Id );
+    printf( ") + (" );
+    Vec_PtrForEachEntry( p->vClassNew, pObj, i )
+        printf( "%d,", pObj->Id );
+    printf( ")\n" );
+*/
+    // put the nodes back into the class memory
+    Vec_PtrForEachEntry( p->vClassOld, pObj, i )
+    {
+        ppClass[i] = pObj;
+        ppClass[Vec_PtrSize(p->vClassOld)+i] = NULL;
+        Fra_ClassObjSetRepr( pObj, i? ppClass[0] : NULL );
+    }
+    ppClass += 2*Vec_PtrSize(p->vClassOld);
+    // put the new nodes into the class memory
+    Vec_PtrForEachEntry( p->vClassNew, pObj, i )
+    {
+        ppClass[i] = pObj;
+        ppClass[Vec_PtrSize(p->vClassNew)+i] = NULL;
+        Fra_ClassObjSetRepr( pObj, i? ppClass[0] : NULL );
+    }
+    return ppClass;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Iteratively refines the classes after simulation.]
+
+  Description [Returns the number of refinements performed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_RefineClassLastIter( Fra_Cla_t * p, Vec_Ptr_t * vClasses )
+{
+    Aig_Obj_t ** pClass, ** pClass2;
+    int nRefis;
+    pClass = Vec_PtrEntryLast( vClasses );
+    for ( nRefis = 0; pClass2 = Fra_RefineClassOne( p, pClass ); nRefis++ )
+    {
+        // if the original class is trivial, remove it
+        if ( pClass[1] == NULL )
+            Vec_PtrPop( vClasses );
+        // if the new class is trivial, stop
+        if ( pClass2[1] == NULL )
+        {
+            nRefis++;
+            break;
+        }
+        // othewise, add the class and continue
+        assert( pClass2[0] != NULL );
+        Vec_PtrPush( vClasses, pClass2 );
+        pClass = pClass2;
+    }
+    return nRefis;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Refines the classes after simulation.]
+
+  Description [Assumes that simulation info is assigned. Returns the
+  number of classes refined.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ClassesRefine( Fra_Cla_t * p )
+{
+    Vec_Ptr_t * vTemp;
+    Aig_Obj_t ** pClass;
+    int i, nRefis;
+    // refine the classes
+    nRefis = 0;
+    Vec_PtrClear( p->vClassesTemp );
+    Vec_PtrForEachEntry( p->vClasses, pClass, i )
+    {
+        // add the class to the new array
+        assert( pClass[0] != NULL );
+        Vec_PtrPush( p->vClassesTemp, pClass );
+        // refine the class iteratively
+        nRefis += Fra_RefineClassLastIter( p, p->vClassesTemp );
+    }
+    // exchange the class representation
+    vTemp = p->vClassesTemp;
+    p->vClassesTemp = p->vClasses;
+    p->vClasses = vTemp;
+    return nRefis;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Refines constant 1 equivalence class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ClassesRefine1( Fra_Cla_t * p, int fRefineNewClass, int * pSkipped )
+{
+    Aig_Obj_t * pObj, ** ppClass;
+    int i, k, nRefis = 1;
+    // check if there is anything to refine
+    if ( Vec_PtrSize(p->vClasses1) == 0 )
+        return 0;
+    // make sure constant 1 class contains only non-constant nodes
+    assert( Vec_PtrEntry(p->vClasses1,0) != Aig_ManConst1(p->pAig) );
+    // collect all the nodes to be refined
+    k = 0;
+    Vec_PtrClear( p->vClassNew );
+    Vec_PtrForEachEntry( p->vClasses1, pObj, i )
+    {
+        if ( p->pFuncNodeIsConst( pObj ) )
+            Vec_PtrWriteEntry( p->vClasses1, k++, pObj );
+        else 
+            Vec_PtrPush( p->vClassNew, pObj );
+    }
+    Vec_PtrShrink( p->vClasses1, k );
+    if ( Vec_PtrSize(p->vClassNew) == 0 )
+        return 0;
+/*
+    printf( "Refined const-1 class: {" );
+    Vec_PtrForEachEntry( p->vClassNew, pObj, i )
+        printf( " %d", pObj->Id );
+    printf( " }\n" );
+*/
+    if ( Vec_PtrSize(p->vClassNew) == 1 )
+    {
+        Fra_ClassObjSetRepr( Vec_PtrEntry(p->vClassNew,0), NULL );
+        return 1;
+    }
+    // create a new class composed of these nodes
+    ppClass = p->pMemClassesFree;
+    p->pMemClassesFree += 2 * Vec_PtrSize(p->vClassNew);
+    Vec_PtrForEachEntry( p->vClassNew, pObj, i )
+    {
+        ppClass[i] = pObj;
+        ppClass[Vec_PtrSize(p->vClassNew)+i] = NULL;
+        Fra_ClassObjSetRepr( pObj, i? ppClass[0] : NULL );
+    }
+    assert( ppClass[0] != NULL );
+    Vec_PtrPush( p->vClasses, ppClass );
+    // iteratively refine this class
+    if ( fRefineNewClass )
+        nRefis += Fra_RefineClassLastIter( p, p->vClasses );
+    else if ( pSkipped )
+        (*pSkipped)++;
+    return nRefis;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts representation of equivalence classes with one class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesTest( Fra_Cla_t * p, int Id1, int Id2 )
+{
+    Aig_Obj_t ** pClass;
+    p->pMemClasses = ALLOC( Aig_Obj_t *, 4 );
+    pClass = p->pMemClasses;
+    assert( Id1 < Id2 );
+    pClass[0] = Aig_ManObj( p->pAig, Id1 );
+    pClass[1] = Aig_ManObj( p->pAig, Id2 );
+    pClass[2] = NULL;
+    pClass[3] = NULL;
+    Fra_ClassObjSetRepr( pClass[1], pClass[0] );
+    Vec_PtrPush( p->vClasses, pClass );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates latch correspondence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesLatchCorr( Fra_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, nEntries = 0;
+    Vec_PtrClear( p->pCla->vClasses1 );
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+    {
+        Vec_PtrPush( p->pCla->vClasses1, pObj );
+        Fra_ClassObjSetRepr( pObj, Aig_ManConst1(p->pManAig) );
+    }
+    // allocate room for classes
+    p->pCla->pMemClasses = ALLOC( Aig_Obj_t *, 2*(nEntries + Vec_PtrSize(p->pCla->vClasses1)) );
+    p->pCla->pMemClassesFree = p->pCla->pMemClasses + 2*nEntries;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Postprocesses the classes by removing half of the less useful.]
+
+  Description []
+               
+  SideEffects [] 
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesPostprocess( Fra_Cla_t * p )
+{
+    int Ratio = 2;
+    Fra_Sml_t * pComb;
+    Aig_Obj_t * pObj, * pRepr, ** ppClass;
+    int * pWeights, WeightMax = 0, i, k, c;
+    // perform combinational simulation
+    pComb = Fra_SmlSimulateComb( p->pAig, 32 );
+    // compute the weight of each node in the classes
+    pWeights = ALLOC( int, Aig_ManObjNumMax(p->pAig) );
+    memset( pWeights, 0, sizeof(int) * Aig_ManObjNumMax(p->pAig) );
+    Aig_ManForEachObj( p->pAig, pObj, i )
+    { 
+        pRepr = Fra_ClassObjRepr( pObj );
+        if ( pRepr == NULL )
+            continue;
+        pWeights[i] = Fra_SmlNodeNotEquWeight( pComb, pRepr->Id, pObj->Id );
+        WeightMax = AIG_MAX( WeightMax, pWeights[i] );
+    }
+    Fra_SmlStop( pComb );
+    printf( "Before: Const = %6d. Class = %6d.  ", Vec_PtrSize(p->vClasses1), Vec_PtrSize(p->vClasses) );
+    // remove nodes from classes whose weight is less than WeightMax/Ratio
+    k = 0;
+    Vec_PtrForEachEntry( p->vClasses1, pObj, i )
+    {
+        if ( pWeights[pObj->Id] >= WeightMax/Ratio )
+            Vec_PtrWriteEntry( p->vClasses1, k++, pObj );
+        else
+            Fra_ClassObjSetRepr( pObj, NULL );
+    }
+    Vec_PtrShrink( p->vClasses1, k );
+    // in each class, compact the nodes
+    Vec_PtrForEachEntry( p->vClasses, ppClass, i )
+    {
+        k = 1;
+        for ( c = 1; ppClass[c]; c++ )
+        {
+            if ( pWeights[ppClass[c]->Id] >= WeightMax/Ratio )
+                ppClass[k++] = ppClass[c];
+            else
+                Fra_ClassObjSetRepr( ppClass[c], NULL );
+        }
+        ppClass[k] = NULL;
+    }
+    // remove classes with only repr
+    k = 0;
+    Vec_PtrForEachEntry( p->vClasses, ppClass, i )
+        if ( ppClass[1] != NULL )
+            Vec_PtrWriteEntry( p->vClasses, k++, ppClass );
+    Vec_PtrShrink( p->vClasses, k );
+    printf( "After: Const = %6d. Class = %6d. \n", Vec_PtrSize(p->vClasses1), Vec_PtrSize(p->vClasses) );
+    free( pWeights );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Postprocesses the classes by selecting representative lowest in top order.]
+
+  Description []
+               
+  SideEffects [] 
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassesSelectRepr( Fra_Cla_t * p )
+{
+    Aig_Obj_t ** pClass, * pNodeMin;
+    int i, c, cMinSupp, nSuppSizeMin, nSuppSizeCur;
+    // reassign representatives in each class
+    Vec_PtrForEachEntry( p->vClasses, pClass, i )
+    {
+        // collect support sizes and find the min-support node
+        pNodeMin = NULL;
+        nSuppSizeMin = AIG_INFINITY;
+        for ( c = 0; pClass[c]; c++ )
+        {
+            nSuppSizeCur = Aig_SupportSize( p->pAig, pClass[c] );
+//            nSuppSizeCur = 1;
+            if ( nSuppSizeMin > nSuppSizeCur || 
+                (nSuppSizeMin == nSuppSizeCur && pNodeMin->Level > pClass[c]->Level) )
+            {
+                nSuppSizeMin = nSuppSizeCur;
+                pNodeMin = pClass[c];
+                cMinSupp = c; 
+            }
+        }
+        // skip the case when the repr did not change
+        if ( cMinSupp == 0 )
+            continue;
+        // make the new node the representative of the class
+        pClass[cMinSupp] = pClass[0];
+        pClass[0] = pNodeMin;
+        // set the representative
+        for ( c = 0; pClass[c]; c++ )
+            Fra_ClassObjSetRepr( pClass[c], c? pClass[0] : NULL );
+    }
+}
+
+
+
+static inline Aig_Obj_t * Fra_ObjEqu( Aig_Obj_t ** ppEquivs, Aig_Obj_t * pObj )                       { return ppEquivs[pObj->Id];  }
+static inline void        Fra_ObjSetEqu( Aig_Obj_t ** ppEquivs, Aig_Obj_t * pObj, Aig_Obj_t * pNode ) { ppEquivs[pObj->Id] = pNode; }
+
+static inline Aig_Obj_t * Fra_ObjChild0Equ( Aig_Obj_t ** ppEquivs, Aig_Obj_t * pObj ) { return Aig_NotCond(Fra_ObjEqu(ppEquivs,Aig_ObjFanin0(pObj)), Aig_ObjFaninC0(pObj));  }
+static inline Aig_Obj_t * Fra_ObjChild1Equ( Aig_Obj_t ** ppEquivs, Aig_Obj_t * pObj ) { return Aig_NotCond(Fra_ObjEqu(ppEquivs,Aig_ObjFanin1(pObj)), Aig_ObjFaninC1(pObj));  }
+
+/**Function*************************************************************
+
+  Synopsis    [Add the node and its constraints to the new AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Fra_ClassesDeriveNode( Aig_Man_t * pManFraig, Aig_Obj_t * pObj, Aig_Obj_t ** ppEquivs )
+{
+    Aig_Obj_t * pObjNew, * pObjRepr, * pObjReprNew, * pMiter;//, * pObjNew2;
+    // skip nodes without representative
+    if ( (pObjRepr = Fra_ClassObjRepr(pObj)) == NULL )
+        return;
+    assert( pObjRepr->Id < pObj->Id );
+    // get the new node 
+    pObjNew = Fra_ObjEqu( ppEquivs, pObj );
+    // get the new node of the representative
+    pObjReprNew = Fra_ObjEqu( ppEquivs, pObjRepr );
+    // if this is the same node, no need to add constraints
+    if ( Aig_Regular(pObjNew) == Aig_Regular(pObjReprNew) )
+        return;
+    // these are different nodes - perform speculative reduction
+//    pObjNew2 = Aig_NotCond( pObjReprNew, pObj->fPhase ^ pObjRepr->fPhase );
+    // set the new node
+//    Fra_ObjSetEqu( ppEquivs, pObj, pObjNew2 );
+    // add the constraint
+    pMiter = Aig_Exor( pManFraig, Aig_Regular(pObjNew), Aig_Regular(pObjReprNew) );
+    pMiter = Aig_NotCond( pMiter, Aig_Regular(pMiter)->fPhase ^ Aig_IsComplement(pMiter) );
+    pMiter = Aig_Not( pMiter );
+    Aig_ObjCreatePo( pManFraig, pMiter );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives AIG for the partitioned problem.]
+
+  Description []
+               
+  SideEffects [] 
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_ClassesDeriveAig( Fra_Cla_t * p, int nFramesK )
+{
+    Aig_Man_t * pManFraig;
+    Aig_Obj_t * pObj, * pObjNew;
+    Aig_Obj_t ** pLatches, ** ppEquivs;
+    int i, k, f, nFramesAll = nFramesK + 1;
+    assert( Aig_ManRegNum(p->pAig) > 0 );
+    assert( Aig_ManRegNum(p->pAig) < Aig_ManPiNum(p->pAig) );
+    assert( nFramesK > 0 );
+    // start the fraig package
+    pManFraig = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * nFramesAll );
+    pManFraig->pName = Aig_UtilStrsav( p->pAig->pName );
+    // allocate place for the node mapping
+    ppEquivs = ALLOC( Aig_Obj_t *, Aig_ManObjNumMax(p->pAig) );
+    Fra_ObjSetEqu( ppEquivs, Aig_ManConst1(p->pAig), Aig_ManConst1(pManFraig) );
+    // create latches for the first frame
+    Aig_ManForEachLoSeq( p->pAig, pObj, i )
+        Fra_ObjSetEqu( ppEquivs, pObj, Aig_ObjCreatePi(pManFraig) );
+    // add timeframes
+    pLatches = ALLOC( Aig_Obj_t *, Aig_ManRegNum(p->pAig) );
+    for ( f = 0; f < nFramesAll; f++ )
+    {
+        // create PIs for this frame
+        Aig_ManForEachPiSeq( p->pAig, pObj, i )
+            Fra_ObjSetEqu( ppEquivs, pObj, Aig_ObjCreatePi(pManFraig) );
+        // set the constraints on the latch outputs
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Fra_ClassesDeriveNode( pManFraig, pObj, ppEquivs );
+        // add internal nodes of this frame
+        Aig_ManForEachNode( p->pAig, pObj, i )
+        {
+            pObjNew = Aig_And( pManFraig, Fra_ObjChild0Equ(ppEquivs, pObj), Fra_ObjChild1Equ(ppEquivs, pObj) );
+            Fra_ObjSetEqu( ppEquivs, pObj, pObjNew );
+            Fra_ClassesDeriveNode( pManFraig, pObj, ppEquivs );
+        }
+        if ( f == nFramesAll - 1 )
+            break;
+        if ( f == nFramesAll - 2 )
+            pManFraig->nAsserts = Aig_ManPoNum(pManFraig);
+        // save the latch input values
+        k = 0;
+        Aig_ManForEachLiSeq( p->pAig, pObj, i )
+            pLatches[k++] = Fra_ObjChild0Equ( ppEquivs, pObj );
+        // insert them to the latch output values
+        k = 0;
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Fra_ObjSetEqu( ppEquivs, pObj, pLatches[k++] );
+    }
+    free( pLatches );
+    free( ppEquivs );
+    // mark the asserts
+    assert( Aig_ManPoNum(pManFraig) % nFramesAll == 0 );
+printf( "Assert miters = %6d. Output miters = %6d.\n", 
+       pManFraig->nAsserts, Aig_ManPoNum(pManFraig) - pManFraig->nAsserts );
+    // remove dangling nodes
+    Aig_ManCleanup( pManFraig );
+    return pManFraig;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraCnf.c b/abc70930/src/aig/fra/fraCnf.c
new file mode 100644
index 00000000..d56c0254
--- /dev/null
+++ b/abc70930/src/aig/fra/fraCnf.c
@@ -0,0 +1,286 @@
+/**CFile****************************************************************
+
+  FileName    [fraCnf.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraCnf.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+
+/**Function*************************************************************
+
+  Synopsis    [Addes clauses to the solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_AddClausesMux( Fra_Man_t * p, Aig_Obj_t * pNode )
+{
+    Aig_Obj_t * pNodeI, * pNodeT, * pNodeE;
+    int pLits[4], RetValue, VarF, VarI, VarT, VarE, fCompT, fCompE;
+
+    assert( !Aig_IsComplement( pNode ) );
+    assert( Aig_ObjIsMuxType( pNode ) );
+    // get nodes (I = if, T = then, E = else)
+    pNodeI = Aig_ObjRecognizeMux( pNode, &pNodeT, &pNodeE );
+    // get the variable numbers
+    VarF = Fra_ObjSatNum(pNode);
+    VarI = Fra_ObjSatNum(pNodeI);
+    VarT = Fra_ObjSatNum(Aig_Regular(pNodeT));
+    VarE = Fra_ObjSatNum(Aig_Regular(pNodeE));
+    // get the complementation flags
+    fCompT = Aig_IsComplement(pNodeT);
+    fCompE = Aig_IsComplement(pNodeE);
+
+    // f = ITE(i, t, e)
+
+    // i' + t' + f
+    // i' + t  + f'
+    // i  + e' + f
+    // i  + e  + f'
+
+    // create four clauses
+    pLits[0] = toLitCond(VarI, 1);
+    pLits[1] = toLitCond(VarT, 1^fCompT);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 1);
+    pLits[1] = toLitCond(VarT, 0^fCompT);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 0);
+    pLits[1] = toLitCond(VarE, 1^fCompE);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 0);
+    pLits[1] = toLitCond(VarE, 0^fCompE);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+
+    // two additional clauses
+    // t' & e' -> f'
+    // t  & e  -> f 
+
+    // t  + e   + f'
+    // t' + e'  + f 
+
+    if ( VarT == VarE )
+    {
+//        assert( fCompT == !fCompE );
+        return;
+    }
+
+    pLits[0] = toLitCond(VarT, 0^fCompT);
+    pLits[1] = toLitCond(VarE, 0^fCompE);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarT, 1^fCompT);
+    pLits[1] = toLitCond(VarE, 1^fCompE);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Addes clauses to the solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_AddClausesSuper( Fra_Man_t * p, Aig_Obj_t * pNode, Vec_Ptr_t * vSuper )
+{
+    Aig_Obj_t * pFanin;
+    int * pLits, nLits, RetValue, i;
+    assert( !Aig_IsComplement(pNode) );
+    assert( Aig_ObjIsNode( pNode ) );
+    // create storage for literals
+    nLits = Vec_PtrSize(vSuper) + 1;
+    pLits = ALLOC( int, nLits );
+    // suppose AND-gate is A & B = C
+    // add !A => !C   or   A + !C
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        pLits[0] = toLitCond(Fra_ObjSatNum(Aig_Regular(pFanin)), Aig_IsComplement(pFanin));
+        pLits[1] = toLitCond(Fra_ObjSatNum(pNode), 1);
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+    }
+    // add A & B => C   or   !A + !B + C
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+        pLits[i] = toLitCond(Fra_ObjSatNum(Aig_Regular(pFanin)), !Aig_IsComplement(pFanin));
+    pLits[nLits-1] = toLitCond(Fra_ObjSatNum(pNode), 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + nLits );
+    assert( RetValue );
+    free( pLits );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_CollectSuper_rec( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper, int fFirst, int fUseMuxes )
+{
+    // if the new node is complemented or a PI, another gate begins
+    if ( Aig_IsComplement(pObj) || Aig_ObjIsPi(pObj) || (!fFirst && Aig_ObjRefs(pObj) > 1) || 
+         (fUseMuxes && Aig_ObjIsMuxType(pObj)) )
+    {
+        Vec_PtrPushUnique( vSuper, pObj );
+        return;
+    }
+    // go through the branches
+    Fra_CollectSuper_rec( Aig_ObjChild0(pObj), vSuper, 0, fUseMuxes );
+    Fra_CollectSuper_rec( Aig_ObjChild1(pObj), vSuper, 0, fUseMuxes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Fra_CollectSuper( Aig_Obj_t * pObj, int fUseMuxes )
+{
+    Vec_Ptr_t * vSuper;
+    assert( !Aig_IsComplement(pObj) );
+    assert( !Aig_ObjIsPi(pObj) );
+    vSuper = Vec_PtrAlloc( 4 );
+    Fra_CollectSuper_rec( pObj, vSuper, 1, fUseMuxes );
+    return vSuper;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the solver clause database.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ObjAddToFrontier( Fra_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vFrontier )
+{
+    Fra_Man_t * pTemp = pObj->pData;
+    assert( !Aig_IsComplement(pObj) );
+    if ( Fra_ObjSatNum(pObj) )
+        return;
+    assert( Fra_ObjSatNum(pObj) == 0 );
+    assert( Fra_ObjFaninVec(pObj) == NULL );
+    if ( Aig_ObjIsConst1(pObj) )
+        return;
+//printf( "Assigning node %d number %d\n", pObj->Id, p->nSatVars );
+    Fra_ObjSetSatNum( pObj, p->nSatVars++ );
+    if ( Aig_ObjIsNode(pObj) )
+        Vec_PtrPush( vFrontier, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the solver clause database.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_CnfNodeAddToSolver( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew )
+{ 
+    Vec_Ptr_t * vFrontier, * vFanins;
+    Aig_Obj_t * pNode, * pFanin;
+    int i, k, fUseMuxes = 1;
+    assert( pOld || pNew );
+    // quit if CNF is ready
+    if ( (!pOld || Fra_ObjFaninVec(pOld)) && (!pNew || Fra_ObjFaninVec(pNew)) )
+        return;
+    // start the frontier
+    vFrontier = Vec_PtrAlloc( 100 );
+    if ( pOld ) Fra_ObjAddToFrontier( p, pOld, vFrontier );
+    if ( pNew ) Fra_ObjAddToFrontier( p, pNew, vFrontier );
+    // explore nodes in the frontier
+    Vec_PtrForEachEntry( vFrontier, pNode, i )
+    {
+        // create the supergate
+        assert( Fra_ObjSatNum(pNode) );
+        assert( Fra_ObjFaninVec(pNode) == NULL );
+        if ( fUseMuxes && Aig_ObjIsMuxType(pNode) )
+        {
+            vFanins = Vec_PtrAlloc( 4 );
+            Vec_PtrPushUnique( vFanins, Aig_ObjFanin0( Aig_ObjFanin0(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Aig_ObjFanin0( Aig_ObjFanin1(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Aig_ObjFanin1( Aig_ObjFanin0(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Aig_ObjFanin1( Aig_ObjFanin1(pNode) ) );
+            Vec_PtrForEachEntry( vFanins, pFanin, k )
+                Fra_ObjAddToFrontier( p, Aig_Regular(pFanin), vFrontier );
+            Fra_AddClausesMux( p, pNode );
+        }
+        else
+        {
+            vFanins = Fra_CollectSuper( pNode, fUseMuxes );
+            Vec_PtrForEachEntry( vFanins, pFanin, k )
+                Fra_ObjAddToFrontier( p, Aig_Regular(pFanin), vFrontier );
+            Fra_AddClausesSuper( p, pNode, vFanins );
+        }
+        assert( Vec_PtrSize(vFanins) > 1 );
+        Fra_ObjSetFaninVec( pNode, vFanins );
+    }
+    Vec_PtrFree( vFrontier );
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraCore.c b/abc70930/src/aig/fra/fraCore.c
new file mode 100644
index 00000000..b390edbe
--- /dev/null
+++ b/abc70930/src/aig/fra/fraCore.c
@@ -0,0 +1,428 @@
+/**CFile****************************************************************
+
+  FileName    [fraCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraCore.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+/* 
+    Speculating reduction in the sequential case leads to an interesting 
+    situation when a counter-ex may not refine any classes. This happens
+    for non-constant equivalence classes. In such cases the representative
+    of the class (proved by simulation to be non-constant) may be reduced 
+    to a constant during the speculative reduction. The fraig-representative 
+    of this representative node is a constant node, even though this is a 
+    non-constant class. Experiments have shown that this situation happens 
+    very often at the beginning of the refinement iteration when there are 
+    many spurious candidate equivalence classes (especially if heavy-duty 
+    simulatation of BMC was node used at the beginning). As a result, the 
+    SAT solver run may return a counter-ex that  distinguishes the given 
+    representative node from the constant-1 node but this counter-ex
+    does not distinguish the nodes in the non-costant class... This is why 
+    there is no check of refinment after a counter-ex in the sequential case.
+*/
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Reports the status of the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_FraigMiterStatus( Aig_Man_t * p )
+{
+    Aig_Obj_t * pObj, * pObjNew;
+    int i, CountConst0 = 0, CountNonConst0 = 0, CountUndecided = 0;
+    if ( p->pData )
+        return 0;
+    Aig_ManForEachPoSeq( p, pObj, i )
+    {
+        pObjNew = Aig_ObjChild0(pObj);
+        // check if the output is constant 0
+        if ( pObjNew == Aig_ManConst0(p) )
+        {
+            CountConst0++;
+            continue;
+        }
+        // check if the output is constant 1
+        if ( pObjNew == Aig_ManConst1(p) )
+        {
+            CountNonConst0++;
+            continue;
+        }
+        // check if the output can be constant 0
+        if ( Aig_Regular(pObjNew)->fPhase != (unsigned)Aig_IsComplement(pObjNew) )
+        {
+            CountNonConst0++;
+            continue;
+        }
+        CountUndecided++;
+    }
+/*
+    if ( p->pParams->fVerbose )
+    {
+        printf( "Miter has %d outputs. ", Aig_ManPoNum(p->pManAig) );
+        printf( "Const0 = %d.  ", CountConst0 );
+        printf( "NonConst0 = %d.  ", CountNonConst0 );
+        printf( "Undecided = %d.  ", CountUndecided );
+        printf( "\n" );
+    }
+*/
+    if ( CountNonConst0 )
+        return 0;
+    if ( CountUndecided )
+        return -1;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Write speculative miter for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Fra_FraigNodeSpeculate( Fra_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pObjFraig, Aig_Obj_t * pObjReprFraig )
+{ 
+    static int Counter = 0;
+    char FileName[20];
+    Aig_Man_t * pTemp;
+    Aig_Obj_t * pNode;
+    int i;
+    // create manager with the logic for these two nodes
+    pTemp = Aig_ManExtractMiter( p->pManFraig, pObjFraig, pObjReprFraig );
+    // dump the logic into a file
+    sprintf( FileName, "aig\\%03d.blif", ++Counter );
+    Aig_ManDumpBlif( pTemp, FileName );
+    printf( "Speculation cone with %d nodes was written into file \"%s\".\n", Aig_ManNodeNum(pTemp), FileName );
+    // clean up
+    Aig_ManStop( pTemp );
+    Aig_ManForEachObj( p->pManFraig, pNode, i )
+        pNode->pData = p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies the generated counter-ex.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_FraigVerifyCounterEx( Fra_Man_t * p, Vec_Int_t * vCex )
+{
+    Aig_Obj_t * pObj, ** ppClass;
+    int i, c;
+    assert( Aig_ManPiNum(p->pManAig) == Vec_IntSize(vCex) );
+    // make sure the input pattern is not used
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        assert( !pObj->fMarkB );
+    // simulate the cex through the AIG
+    Aig_ManConst1(p->pManAig)->fMarkB = 1;
+    Aig_ManForEachPi( p->pManAig, pObj, i )
+        pObj->fMarkB = Vec_IntEntry(vCex, i);
+    Aig_ManForEachNode( p->pManAig, pObj, i )
+        pObj->fMarkB = (Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj)) & 
+                       (Aig_ObjFanin1(pObj)->fMarkB ^ Aig_ObjFaninC1(pObj));
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+        pObj->fMarkB = Aig_ObjFanin0(pObj)->fMarkB ^ Aig_ObjFaninC0(pObj);
+    // check if the classes hold
+    Vec_PtrForEachEntry( p->pCla->vClasses1, pObj, i )
+    {
+        if ( pObj->fPhase != pObj->fMarkB )
+            printf( "The node %d is not constant under cex!\n", pObj->Id );
+    }
+    Vec_PtrForEachEntry( p->pCla->vClasses, ppClass, i )
+    {
+        for ( c = 1; ppClass[c]; c++ )
+            if ( (ppClass[0]->fPhase ^ ppClass[c]->fPhase) != (ppClass[0]->fMarkB ^ ppClass[c]->fMarkB) )
+                printf( "The nodes %d and %d are not equal under cex!\n", ppClass[0]->Id, ppClass[c]->Id );
+//        for ( c = 0; ppClass[c]; c++ )
+//            if ( Fra_ObjFraig(ppClass[c],p->pPars->nFramesK) == Aig_ManConst1(p->pManFraig) )
+//                printf( "A member of non-constant class has a constant repr!\n" );
+    }
+    // clean the simulation pattern
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        pObj->fMarkB = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging for one node.]
+
+  Description [Returns the fraiged node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Fra_FraigNode( Fra_Man_t * p, Aig_Obj_t * pObj )
+{ 
+    Aig_Obj_t * pObjRepr, * pObjFraig, * pObjFraig2, * pObjReprFraig;
+    int RetValue;
+    assert( !Aig_IsComplement(pObj) );
+    // get representative of this class
+    pObjRepr = Fra_ClassObjRepr( pObj );
+    if ( pObjRepr == NULL || // this is a unique node
+       (!p->pPars->fDoSparse && pObjRepr == Aig_ManConst1(p->pManAig)) ) // this is a sparse node
+        return;
+    // get the fraiged node
+    pObjFraig = Fra_ObjFraig( pObj, p->pPars->nFramesK );
+    // get the fraiged representative
+    pObjReprFraig = Fra_ObjFraig( pObjRepr, p->pPars->nFramesK );
+    // if the fraiged nodes are the same, return
+    if ( Aig_Regular(pObjFraig) == Aig_Regular(pObjReprFraig) )
+    {
+        p->nSatCallsSkipped++;
+        return;
+    }
+    assert( p->pPars->nFramesK || Aig_Regular(pObjFraig) != Aig_ManConst1(p->pManFraig) );
+    // if they are proved different, the c-ex will be in p->pPatWords
+    RetValue = Fra_NodesAreEquiv( p, Aig_Regular(pObjReprFraig), Aig_Regular(pObjFraig) );
+    if ( RetValue == 1 )  // proved equivalent
+    {
+//        if ( p->pPars->fChoicing )
+//            Aig_ObjCreateRepr( p->pManFraig, Aig_Regular(pObjReprFraig), Aig_Regular(pObjFraig) );
+        // the nodes proved equal
+        pObjFraig2 = Aig_NotCond( pObjReprFraig, pObj->fPhase ^ pObjRepr->fPhase );
+        Fra_ObjSetFraig( pObj, p->pPars->nFramesK, pObjFraig2 );
+        return;
+    }
+    if ( RetValue == -1 ) // failed
+    {
+        if ( p->vTimeouts == NULL )
+            p->vTimeouts = Vec_PtrAlloc( 100 );
+        Vec_PtrPush( p->vTimeouts, pObj );
+        if ( !p->pPars->fSpeculate )
+            return;
+        assert( 0 );
+        // speculate
+        p->nSpeculs++;
+        pObjFraig2 = Aig_NotCond( pObjReprFraig, pObj->fPhase ^ pObjRepr->fPhase );
+        Fra_ObjSetFraig( pObj, p->pPars->nFramesK, pObjFraig2 );
+        Fra_FraigNodeSpeculate( p, pObj, Aig_Regular(pObjFraig), Aig_Regular(pObjReprFraig) );
+        return;
+    }
+    // disprove the nodes
+    p->pCla->fRefinement = 1;
+    // if we do not include the node into those disproved, we may end up 
+    // merging this node with another representative, for which proof has timed out
+    if ( p->vTimeouts )
+        Vec_PtrPush( p->vTimeouts, pObj );
+    // verify that the counter-example satisfies all the constraints
+//    if ( p->vCex )
+//        Fra_FraigVerifyCounterEx( p, p->vCex );
+    // simulate the counter-example and return the Fraig node
+    Fra_SmlResimulate( p );
+    if ( !p->pPars->nFramesK && Fra_ClassObjRepr(pObj) == pObjRepr )
+        printf( "Fra_FraigNode(): Error in class refinement!\n" );
+    assert( p->pPars->nFramesK || Fra_ClassObjRepr(pObj) != pObjRepr );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging for the internal nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_FraigSweep( Fra_Man_t * p )
+{
+    Bar_Progress_t * pProgress;
+    Aig_Obj_t * pObj, * pObjNew;
+    int i, k = 0, Pos = 0;
+    // fraig latch outputs
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+    {
+        Fra_FraigNode( p, pObj );
+        if ( p->pPars->fUseImps )
+            Pos = Fra_ImpCheckForNode( p, p->pCla->vImps, pObj, Pos );
+    }
+    if ( p->pPars->fLatchCorr )
+        return;
+    // fraig internal nodes
+    pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(p->pManAig) );
+    Aig_ManForEachNode( p->pManAig, pObj, i )
+    {
+        Bar_ProgressUpdate( pProgress, i, NULL );
+        // derive and remember the new fraig node
+        pObjNew = Aig_And( p->pManFraig, Fra_ObjChild0Fra(pObj,p->pPars->nFramesK), Fra_ObjChild1Fra(pObj,p->pPars->nFramesK) );
+        Fra_ObjSetFraig( pObj, p->pPars->nFramesK, pObjNew );
+        Aig_Regular(pObjNew)->pData = p;
+        // quit if simulation detected a counter-example for a PO
+        if ( p->pManFraig->pData )
+            continue;
+        // perform fraiging
+        Fra_FraigNode( p, pObj );
+        if ( p->pPars->fUseImps )
+            Pos = Fra_ImpCheckForNode( p, p->pCla->vImps, pObj, Pos );
+    }
+    Bar_ProgressStop( pProgress );
+    // try to prove the outputs of the miter
+    p->nNodesMiter = Aig_ManNodeNum(p->pManFraig);
+//    Fra_MiterStatus( p->pManFraig );
+//    if ( p->pPars->fProve && p->pManFraig->pData == NULL )
+//        Fra_MiterProve( p );
+    // compress implications after processing all of them
+    if ( p->pPars->fUseImps )
+        Fra_ImpCompactArray( p->pCla->vImps );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FraigPerform( Aig_Man_t * pManAig, Fra_Par_t * pPars )
+{
+    Fra_Man_t * p;
+    Aig_Man_t * pManAigNew;
+    int clk;
+    if ( Aig_ManNodeNum(pManAig) == 0 )
+        return Aig_ManDup(pManAig, 1);
+clk = clock();
+    assert( Aig_ManLatchNum(pManAig) == 0 );
+    p = Fra_ManStart( pManAig, pPars );
+    p->pManFraig = Fra_ManPrepareComb( p );
+    p->pSml = Fra_SmlStart( pManAig, 0, 1, pPars->nSimWords );
+    Fra_SmlSimulate( p, 0 );
+//    if ( p->pPars->fChoicing )
+//        Aig_ManReprStart( p->pManFraig, Aig_ManObjNumMax(p->pManAig) );
+    // collect initial states
+    p->nLitsBeg  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesBeg = Aig_ManNodeNum(pManAig);
+    p->nRegsBeg  = Aig_ManRegNum(pManAig);
+    // perform fraig sweep
+    Fra_FraigSweep( p );
+    // call back the procedure to check implications
+    if ( pManAig->pImpFunc )
+        pManAig->pImpFunc( p, pManAig->pImpData );
+    // finalize the fraiged manager
+    Fra_ManFinalizeComb( p );
+    if ( p->pPars->fChoicing )
+    {
+int clk2 = clock();
+        Fra_ClassesCopyReprs( p->pCla, p->vTimeouts );
+        pManAigNew = Aig_ManDupRepr( p->pManAig, 1 );
+        Aig_ManReprStart( pManAigNew, Aig_ManObjNumMax(pManAigNew) );
+        Aig_ManTransferRepr( pManAigNew, p->pManAig );
+        Aig_ManMarkValidChoices( pManAigNew );
+        Aig_ManStop( p->pManFraig );
+        p->pManFraig = NULL;
+p->timeTrav += clock() - clk2;
+    }
+    else
+    {
+        Aig_ManCleanup( p->pManFraig );
+        pManAigNew = p->pManFraig;
+        p->pManFraig = NULL;
+    }
+p->timeTotal = clock() - clk;
+    // collect final stats
+    p->nLitsEnd  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesEnd = Aig_ManNodeNum(pManAigNew);
+    p->nRegsEnd  = Aig_ManRegNum(pManAigNew);
+    Fra_ManStop( p );
+    return pManAigNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs choicing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FraigChoice( Aig_Man_t * pManAig, int nConfMax )
+{
+    Fra_Par_t Pars, * pPars = &Pars; 
+    Fra_ParamsDefault( pPars );
+    pPars->nBTLimitNode = nConfMax;
+    pPars->fChoicing    = 1;
+    pPars->fDoSparse    = 1;
+    pPars->fSpeculate   = 0;
+    pPars->fProve       = 0;
+    pPars->fVerbose     = 0;
+    return Fra_FraigPerform( pManAig, pPars );
+}
+ 
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FraigEquivence( Aig_Man_t * pManAig, int nConfMax )
+{
+    Aig_Man_t * pFraig;
+    Fra_Par_t Pars, * pPars = &Pars; 
+    Fra_ParamsDefault( pPars );
+    pPars->nBTLimitNode = nConfMax;
+    pPars->fChoicing    = 0;
+    pPars->fDoSparse    = 1;
+    pPars->fSpeculate   = 0;
+    pPars->fProve       = 0;
+    pPars->fVerbose     = 0;
+    pFraig = Fra_FraigPerform( pManAig, pPars );
+    return pFraig;
+} 
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraImp.c b/abc70930/src/aig/fra/fraImp.c
new file mode 100644
index 00000000..a5fc7d58
--- /dev/null
+++ b/abc70930/src/aig/fra/fraImp.c
@@ -0,0 +1,721 @@
+/**CFile****************************************************************
+
+  FileName    [fraImp.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Detecting and proving implications.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraImp.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1s in each siminfo of each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Fra_SmlCountOnesOne( Fra_Sml_t * p, int Node )
+{
+    unsigned * pSim;
+    int k, Counter = 0;
+    pSim = Fra_ObjSim( p, Node );
+    for ( k = p->nWordsPref; k < p->nWordsTotal; k++ )
+        Counter += Aig_WordCountOnes( pSim[k] );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1s in each siminfo of each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int * Fra_SmlCountOnes( Fra_Sml_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i, * pnBits; 
+    pnBits = ALLOC( int, Aig_ManObjNumMax(p->pAig) );  
+    memset( pnBits, 0, sizeof(int) * Aig_ManObjNumMax(p->pAig) );
+    Aig_ManForEachObj( p->pAig, pObj, i )
+        pnBits[i] = Fra_SmlCountOnesOne( p, i );
+    return pnBits;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if implications holds.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Sml_NodeCheckImp( Fra_Sml_t * p, int Left, int Right )
+{
+    unsigned * pSimL, * pSimR;
+    int k;
+    pSimL = Fra_ObjSim( p, Left );
+    pSimR = Fra_ObjSim( p, Right );
+    for ( k = p->nWordsPref; k < p->nWordsTotal; k++ )
+        if ( pSimL[k] & ~pSimR[k] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1s in the complement of the implication.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Sml_NodeNotImpWeight( Fra_Sml_t * p, int Left, int Right )
+{
+    unsigned * pSimL, * pSimR;
+    int k, Counter = 0;
+    pSimL = Fra_ObjSim( p, Left );
+    pSimR = Fra_ObjSim( p, Right );
+    for ( k = p->nWordsPref; k < p->nWordsTotal; k++ )
+        Counter += Aig_WordCountOnes( pSimL[k] & ~pSimR[k] );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the complement of the implication.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Sml_NodeSaveNotImpPatterns( Fra_Sml_t * p, int Left, int Right, unsigned * pResult )
+{
+    unsigned * pSimL, * pSimR;
+    int k;
+    pSimL = Fra_ObjSim( p, Left );
+    pSimR = Fra_ObjSim( p, Right );
+    for ( k = p->nWordsPref; k < p->nWordsTotal; k++ )
+        pResult[k] |= pSimL[k] & ~pSimR[k];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the array of nodes sorted by the number of 1s.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Fra_SmlSortUsingOnes( Fra_Sml_t * p, int fLatchCorr )
+{
+    Aig_Obj_t * pObj;
+    Vec_Ptr_t * vNodes;
+    int i, nNodes, nTotal, nBits, * pnNodes, * pnBits, * pMemory;
+    assert( p->nWordsTotal > 0 );
+    // count 1s in each node's siminfo
+    pnBits = Fra_SmlCountOnes( p );
+    // count number of nodes having that many 1s
+    nNodes = 0;
+    nBits = p->nWordsTotal * 32;
+    pnNodes = ALLOC( int, nBits + 1 );
+    memset( pnNodes, 0, sizeof(int) * (nBits + 1) );
+    Aig_ManForEachObj( p->pAig, pObj, i )
+    {
+        if ( i == 0 ) continue;
+        // skip non-PI and non-internal nodes
+        if ( fLatchCorr )
+        {
+            if ( !Aig_ObjIsPi(pObj) )
+                continue;
+        }
+        else
+        {
+            if ( !Aig_ObjIsNode(pObj) && !Aig_ObjIsPi(pObj) )
+                continue;
+        }
+        // skip nodes participating in the classes
+//        if ( Fra_ClassObjRepr(pObj) )
+//            continue;
+        assert( pnBits[i] <= nBits ); // "<" because of normalized info
+        pnNodes[pnBits[i]]++;
+        nNodes++;
+    }
+    // allocate memory for all the nodes
+    pMemory = ALLOC( int, nNodes + nBits + 1 );  
+    // markup the memory for each node
+    vNodes = Vec_PtrAlloc( nBits + 1 );
+    Vec_PtrPush( vNodes, pMemory );
+    for ( i = 1; i <= nBits; i++ )
+    {
+        pMemory += pnNodes[i-1] + 1;
+        Vec_PtrPush( vNodes, pMemory );
+    }
+    // add the nodes
+    memset( pnNodes, 0, sizeof(int) * (nBits + 1) );
+    Aig_ManForEachObj( p->pAig, pObj, i )
+    {
+        if ( i == 0 ) continue;
+        // skip non-PI and non-internal nodes
+        if ( fLatchCorr )
+        {
+            if ( !Aig_ObjIsPi(pObj) )
+                continue;
+        }
+        else
+        {
+            if ( !Aig_ObjIsNode(pObj) && !Aig_ObjIsPi(pObj) )
+                continue;
+        }
+        // skip nodes participating in the classes
+//        if ( Fra_ClassObjRepr(pObj) )
+//            continue;
+        pMemory = Vec_PtrEntry( vNodes, pnBits[i] );
+        pMemory[ pnNodes[pnBits[i]]++ ] = i;
+    }
+    // add 0s in the end
+    nTotal = 0;
+    Vec_PtrForEachEntry( vNodes, pMemory, i )
+    {
+        pMemory[ pnNodes[i]++ ] = 0;
+        nTotal += pnNodes[i];
+    }
+    assert( nTotal == nNodes + nBits + 1 );
+    free( pnNodes );
+    free( pnBits );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the array of implications with the highest cost.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Fra_SmlSelectMaxCost( Vec_Int_t * vImps, int * pCosts, int nCostMax, int nImpLimit, int * pCostRange )
+{
+    Vec_Int_t * vImpsNew;
+    int * pCostCount, nImpCount, Imp, i, c;
+    assert( Vec_IntSize(vImps) >= nImpLimit );
+    // count how many implications have each cost
+    pCostCount = ALLOC( int, nCostMax + 1 );
+    memset( pCostCount, 0, sizeof(int) * (nCostMax + 1) );
+    for ( i = 0; i < Vec_IntSize(vImps); i++ )
+    {
+        assert( pCosts[i] <= nCostMax );
+        pCostCount[ pCosts[i] ]++;
+    }
+    assert( pCostCount[0] == 0 );
+    // select the bound on the cost (above this bound, implication will be included)
+    nImpCount = 0;
+    for ( c = nCostMax; c > 0; c-- )
+    {
+        nImpCount += pCostCount[c];
+        if ( nImpCount >= nImpLimit )
+            break;
+    }
+//    printf( "Cost range >= %d.\n", c );
+    // collect implications with the given costs
+    vImpsNew = Vec_IntAlloc( nImpLimit );
+    Vec_IntForEachEntry( vImps, Imp, i )
+    {
+        if ( pCosts[i] < c )
+            continue;
+        Vec_IntPush( vImpsNew, Imp );
+        if ( Vec_IntSize( vImpsNew ) == nImpLimit )
+            break;
+    }
+    free( pCostCount );
+    if ( pCostRange )
+        *pCostRange = c;
+    return vImpsNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compares two implications using their largest ID.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Sml_CompareMaxId( unsigned short * pImp1, unsigned short * pImp2 )
+{
+    int Max1 = AIG_MAX( pImp1[0], pImp1[1] );
+    int Max2 = AIG_MAX( pImp2[0], pImp2[1] );
+    if ( Max1 < Max2 )
+        return -1;
+    if ( Max1 > Max2  )
+        return 1;
+    return 0; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives implication candidates.]
+
+  Description [Implication candidates have the property that 
+  (1) they hold using sequential simulation information
+  (2) they do not hold using combinational simulation information
+  (3) they have as high expressive power as possible (heuristically)
+      that is, they are easy to disprove combinationally
+      meaning they cover relatively larger sequential subspace.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Fra_ImpDerive( Fra_Man_t * p, int nImpMaxLimit, int nImpUseLimit, int fLatchCorr )
+{
+    int nSimWords = 64;
+    Fra_Sml_t * pSeq, * pComb;
+    Vec_Int_t * vImps, * vTemp;
+    Vec_Ptr_t * vNodes;
+    int * pImpCosts, * pNodesI, * pNodesK;
+    int nImpsTotal = 0, nImpsTried = 0, nImpsNonSeq = 0, nImpsComb = 0, nImpsCollected = 0;
+    int CostMin = AIG_INFINITY, CostMax = 0;
+    int i, k, Imp, CostRange, clk = clock();
+    assert( Aig_ManObjNumMax(p->pManAig) < (1 << 15) );
+    assert( nImpMaxLimit > 0 && nImpUseLimit > 0 && nImpUseLimit <= nImpMaxLimit );
+    // normalize both managers
+    pComb = Fra_SmlSimulateComb( p->pManAig, nSimWords );
+    pSeq = Fra_SmlSimulateSeq( p->pManAig, p->pPars->nFramesP, nSimWords, 1 );
+    // get the nodes sorted by the number of 1s
+    vNodes = Fra_SmlSortUsingOnes( pSeq, fLatchCorr );
+    // count the total number of implications
+    for ( k = nSimWords * 32; k > 0; k-- )
+    for ( i = k - 1; i > 0; i-- )
+    for ( pNodesI = Vec_PtrEntry( vNodes, i ); *pNodesI; pNodesI++ )
+    for ( pNodesK = Vec_PtrEntry( vNodes, k ); *pNodesK; pNodesK++ )
+        nImpsTotal++;
+
+    // compute implications and their costs
+    pImpCosts = ALLOC( int, nImpMaxLimit );
+    vImps = Vec_IntAlloc( nImpMaxLimit );
+    for ( k = pSeq->nWordsTotal * 32; k > 0; k-- )
+        for ( i = k - 1; i > 0; i-- )
+        {
+            for ( pNodesI = Vec_PtrEntry( vNodes, i ); *pNodesI; pNodesI++ )
+            for ( pNodesK = Vec_PtrEntry( vNodes, k ); *pNodesK; pNodesK++ )
+            {
+                nImpsTried++;
+                if ( !Sml_NodeCheckImp(pSeq, *pNodesI, *pNodesK) )
+                {
+                    nImpsNonSeq++;
+                    continue;
+                }
+                if ( Sml_NodeCheckImp(pComb, *pNodesI, *pNodesK) )
+                {
+                    nImpsComb++;
+                    continue;
+                }
+                nImpsCollected++;
+                Imp = Fra_ImpCreate( *pNodesI, *pNodesK );
+                pImpCosts[ Vec_IntSize(vImps) ] = Sml_NodeNotImpWeight(pComb, *pNodesI, *pNodesK);
+                CostMin = AIG_MIN( CostMin, pImpCosts[ Vec_IntSize(vImps) ] );
+                CostMax = AIG_MAX( CostMax, pImpCosts[ Vec_IntSize(vImps) ] );
+                Vec_IntPush( vImps, Imp );
+                if ( Vec_IntSize(vImps) == nImpMaxLimit )
+                    goto finish;
+            } 
+        }
+finish:
+    Fra_SmlStop( pComb );
+    Fra_SmlStop( pSeq );
+
+    // select implications with the highest cost
+    CostRange = CostMin;
+    if ( Vec_IntSize(vImps) > nImpUseLimit )
+    {
+        vImps = Fra_SmlSelectMaxCost( vTemp = vImps, pImpCosts, nSimWords * 32, nImpUseLimit, &CostRange );
+        Vec_IntFree( vTemp );  
+    }
+
+    // dealloc
+    free( pImpCosts ); 
+    free( Vec_PtrEntry(vNodes, 0) );
+    Vec_PtrFree( vNodes );
+    // reorder implications topologically
+    qsort( (void *)Vec_IntArray(vImps), Vec_IntSize(vImps), sizeof(int), 
+            (int (*)(const void *, const void *)) Sml_CompareMaxId );
+if ( p->pPars->fVerbose )
+{
+printf( "Implications: All = %d. Try = %d. NonSeq = %d. Comb = %d. Res = %d.\n", 
+    nImpsTotal, nImpsTried, nImpsNonSeq, nImpsComb, nImpsCollected );
+printf( "Implication weight: Min = %d. Pivot = %d. Max = %d.   ", 
+       CostMin, CostRange, CostMax );
+PRT( "Time", clock() - clk );
+}
+    return vImps;
+}
+
+
+// the following three procedures are called to 
+// - add implications to the SAT solver
+// - check implications using the SAT solver
+// - refine implications using after a cex is generated
+
+/**Function*************************************************************
+
+  Synopsis    [Add implication clauses to the SAT solver.]
+
+  Description [Note that implications should be checked in the first frame!]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ImpAddToSolver( Fra_Man_t * p, Vec_Int_t * vImps, int * pSatVarNums )
+{
+    sat_solver * pSat = p->pSat;
+    Aig_Obj_t * pLeft, * pRight;
+    Aig_Obj_t * pLeftF, * pRightF;
+    int pLits[2], Imp, Left, Right, i, f, status;
+    int fComplL, fComplR;
+    Vec_IntForEachEntry( vImps, Imp, i )
+    {
+        // get the corresponding nodes
+        pLeft = Aig_ManObj( p->pManAig, Fra_ImpLeft(Imp) );
+        pRight = Aig_ManObj( p->pManAig, Fra_ImpRight(Imp) );
+        // check if all the nodes are present
+        for ( f = 0; f < p->pPars->nFramesK; f++ )
+        {
+            // map these info fraig
+            pLeftF = Fra_ObjFraig( pLeft, f );
+            pRightF = Fra_ObjFraig( pRight, f );
+            if ( Aig_ObjIsNone(Aig_Regular(pLeftF)) || Aig_ObjIsNone(Aig_Regular(pRightF)) )
+            {
+                Vec_IntWriteEntry( vImps, i, 0 );
+                break;
+            }
+        }
+        if ( f < p->pPars->nFramesK )
+            continue;
+        // add constraints in each timeframe
+        for ( f = 0; f < p->pPars->nFramesK; f++ )
+        {
+            // map these info fraig
+            pLeftF = Fra_ObjFraig( pLeft, f );
+            pRightF = Fra_ObjFraig( pRight, f );
+            // get the corresponding SAT numbers
+            Left = pSatVarNums[ Aig_Regular(pLeftF)->Id ];
+            Right = pSatVarNums[ Aig_Regular(pRightF)->Id ];
+            assert( Left > 0  && Left < p->nSatVars );
+            assert( Right > 0 && Right < p->nSatVars );
+            // get the complemented attributes
+            fComplL = pLeft->fPhase ^ Aig_IsComplement(pLeftF);
+            fComplR = pRight->fPhase ^ Aig_IsComplement(pRightF);
+            // get the constraint
+            // L => R      L' v R     (complement = L & R')
+            pLits[0] = 2 * Left  + !fComplL;
+            pLits[1] = 2 * Right +  fComplR;
+            // add contraint to solver
+            if ( !sat_solver_addclause( pSat, pLits, pLits + 2 ) )
+            {
+                sat_solver_delete( pSat );
+                p->pSat = NULL;
+                return;
+            }
+        }
+    }
+    status = sat_solver_simplify(pSat);
+    if ( status == 0 )
+    {
+        sat_solver_delete( pSat );
+        p->pSat = NULL;
+    }
+//    printf( "Total imps = %d. ", Vec_IntSize(vImps) );
+    Fra_ImpCompactArray( vImps );
+//    printf( "Valid imps = %d. \n", Vec_IntSize(vImps) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check implications for the node (if they are present).]
+
+  Description [Returns the new position in the array.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ImpCheckForNode( Fra_Man_t * p, Vec_Int_t * vImps, Aig_Obj_t * pNode, int Pos )
+{
+    Aig_Obj_t * pLeft, * pRight;
+    Aig_Obj_t * pLeftF, * pRightF;
+    int i, Imp, Left, Right, Max, RetValue;
+    int fComplL, fComplR;
+    Vec_IntForEachEntryStart( vImps, Imp, i, Pos )
+    {
+        if ( Imp == 0 )
+            continue;
+        Left = Fra_ImpLeft(Imp);
+        Right = Fra_ImpRight(Imp);
+        Max = AIG_MAX( Left, Right );
+        assert( Max >= pNode->Id );
+        if ( Max > pNode->Id )
+            return i;
+        // get the corresponding nodes
+        pLeft  = Aig_ManObj( p->pManAig, Left );
+        pRight = Aig_ManObj( p->pManAig, Right );
+        // get the corresponding FRAIG nodes
+        pLeftF  = Fra_ObjFraig( pLeft, p->pPars->nFramesK );
+        pRightF = Fra_ObjFraig( pRight, p->pPars->nFramesK );
+        // get the complemented attributes
+        fComplL = pLeft->fPhase ^ Aig_IsComplement(pLeftF);
+        fComplR = pRight->fPhase ^ Aig_IsComplement(pRightF);
+        // check equality
+        if ( Aig_Regular(pLeftF) == Aig_Regular(pRightF) )
+        {
+            if ( fComplL == fComplR ) // x => x  - always true
+                continue;
+            assert( fComplL != fComplR );
+            // consider 4 possibilities:
+            // NOT(1) => 1    or   0 => 1  - always true
+            // 1 => NOT(1)    or   1 => 0  - never true
+            // NOT(x) => x    or   x       - not always true
+            // x => NOT(x)    or   NOT(x)  - not always true
+            if ( Aig_ObjIsConst1(Aig_Regular(pLeftF)) && fComplL ) // proved implication
+                continue;
+            // disproved implication
+            p->pCla->fRefinement = 1;
+            Vec_IntWriteEntry( vImps, i, 0 );
+            continue;
+        }
+        // check the implication 
+        // - if true, a clause is added
+        // - if false, a cex is simulated
+        // make sure the implication is refined
+        RetValue = Fra_NodesAreImp( p, Aig_Regular(pLeftF), Aig_Regular(pRightF), fComplL, fComplR );
+        if ( RetValue != 1 )
+        {
+            p->pCla->fRefinement = 1;
+            if ( RetValue == 0 )
+                Fra_SmlResimulate( p );
+            if ( Vec_IntEntry(vImps, i) != 0 )
+                printf( "Fra_ImpCheckForNode(): Implication is not refined!\n" );
+            assert( Vec_IntEntry(vImps, i) == 0 );
+        }
+    }
+    return i;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes those implications that no longer hold.]
+
+  Description [Returns 1 if refinement has happened.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ImpRefineUsingCex( Fra_Man_t * p, Vec_Int_t * vImps )
+{
+    Aig_Obj_t * pLeft, * pRight;
+    int Imp, i, RetValue = 0;
+    Vec_IntForEachEntry( vImps, Imp, i )
+    {
+        if ( Imp == 0 )
+            continue;
+        // get the corresponding nodes
+        pLeft = Aig_ManObj( p->pManAig, Fra_ImpLeft(Imp) );
+        pRight = Aig_ManObj( p->pManAig, Fra_ImpRight(Imp) );
+        // check if implication holds using this simulation info
+        if ( !Sml_NodeCheckImp(p->pSml, pLeft->Id, pRight->Id) )
+        {
+            Vec_IntWriteEntry( vImps, i, 0 );
+            RetValue = 1;
+        }
+    }
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes empty implications.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ImpCompactArray( Vec_Int_t * vImps )
+{
+    int i, k, Imp;
+    k = 0;
+    Vec_IntForEachEntry( vImps, Imp, i )
+        if ( Imp )
+            Vec_IntWriteEntry( vImps, k++, Imp );
+    Vec_IntShrink( vImps, k );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Determines the ratio of the state space by computed implications.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+double Fra_ImpComputeStateSpaceRatio( Fra_Man_t * p )
+{
+    int nSimWords = 64;
+    Fra_Sml_t * pComb;
+    unsigned * pResult;
+    double Ratio = 0.0;
+    int Left, Right, Imp, i;
+    if ( p->pCla->vImps == NULL || Vec_IntSize(p->pCla->vImps) == 0 )
+        return Ratio;
+    // simulate the AIG manager with combinational patterns
+    pComb = Fra_SmlSimulateComb( p->pManAig, nSimWords );
+    // go through the implications and collect where they do not hold
+    pResult = Fra_ObjSim( pComb, 0 );
+    assert( pResult[0] == 0 );
+    Vec_IntForEachEntry( p->pCla->vImps, Imp, i )
+    {
+        Left = Fra_ImpLeft(Imp);
+        Right = Fra_ImpRight(Imp);
+        Sml_NodeSaveNotImpPatterns( pComb, Left, Right, pResult );
+    }
+    // count the number of ones in this area
+    Ratio = 100.0 * Fra_SmlCountOnesOne( pComb, 0 ) / (32*(pComb->nWordsTotal-pComb->nWordsPref));
+    Fra_SmlStop( pComb );
+    return Ratio;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of failed implications.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_ImpVerifyUsingSimulation( Fra_Man_t * p )
+{
+    int nFrames = 2000;
+    int nSimWords = 8;
+    Fra_Sml_t * pSeq;
+    char * pfFails;
+    int Left, Right, Imp, i, Counter;
+    if ( p->pCla->vImps == NULL || Vec_IntSize(p->pCla->vImps) == 0 )
+        return 0;
+    // simulate the AIG manager with combinational patterns
+    pSeq = Fra_SmlSimulateSeq( p->pManAig, p->pPars->nFramesP, nFrames, nSimWords );
+    // go through the implications and check how many of them do not hold
+    pfFails = ALLOC( char, Vec_IntSize(p->pCla->vImps) );
+    memset( pfFails, 0, sizeof(char) * Vec_IntSize(p->pCla->vImps) );
+    Vec_IntForEachEntry( p->pCla->vImps, Imp, i )
+    {
+        Left = Fra_ImpLeft(Imp);
+        Right = Fra_ImpRight(Imp);
+        pfFails[i] = !Sml_NodeCheckImp( pSeq, Left, Right );
+    }
+    // count how many has failed
+    Counter = 0;
+    for ( i = 0; i < Vec_IntSize(p->pCla->vImps); i++ )
+        Counter += pfFails[i];
+    free( pfFails );
+    Fra_SmlStop( pSeq );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Record proven implications in the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ImpRecordInManager( Fra_Man_t * p, Aig_Man_t * pNew )
+{
+    Aig_Obj_t * pLeft, * pRight, * pMiter;
+    int nPosOld, Imp, i;
+    if ( p->pCla->vImps == NULL || Vec_IntSize(p->pCla->vImps) == 0 )
+        return;
+    // go through the implication
+    nPosOld = Aig_ManPoNum(pNew);
+    Vec_IntForEachEntry( p->pCla->vImps, Imp, i )
+    {
+        pLeft = Aig_ManObj( p->pManAig, Fra_ImpLeft(Imp) );
+        pRight = Aig_ManObj( p->pManAig, Fra_ImpRight(Imp) );
+        // record the implication: L' + R
+        pMiter = Aig_Or( pNew, 
+            Aig_NotCond(pLeft->pData, !pLeft->fPhase), 
+            Aig_NotCond(pRight->pData, pRight->fPhase) ); 
+        Aig_ObjCreatePo( pNew, pMiter );
+    }
+    pNew->nAsserts = Aig_ManPoNum(pNew) - nPosOld;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraInd.c b/abc70930/src/aig/fra/fraInd.c
new file mode 100644
index 00000000..f45e8af0
--- /dev/null
+++ b/abc70930/src/aig/fra/fraInd.c
@@ -0,0 +1,479 @@
+/**CFile****************************************************************
+
+  FileName    [fraInd.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Inductive prover.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraInd.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+#include "cnf.h"
+#include "dar.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs AIG rewriting on the constaint manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_FraigInductionRewrite( Fra_Man_t * p )
+{
+    Aig_Man_t * pTemp;
+    Aig_Obj_t * pObj, * pObjPo;
+    int nTruePis, k, i, clk = clock();
+    // perform AIG rewriting on the speculated frames
+    pTemp = Aig_ManDup( p->pManFraig, 0 );
+//    pTemp = Dar_ManRwsat( pTemp, 1, 0 );
+    pTemp = Dar_ManRewriteDefault( pTemp );
+//    printf( "Before = %6d.  After = %6d.\n", Aig_ManNodeNum(p->pManFraig), Aig_ManNodeNum(pTemp) ); 
+//Aig_ManDumpBlif( p->pManFraig, "1.blif" );
+//Aig_ManDumpBlif( pTemp, "2.blif" );
+//    Fra_FramesWriteCone( pTemp );
+//    Aig_ManStop( pTemp );
+    // transfer PI/register pointers
+    assert( p->pManFraig->nRegs == pTemp->nRegs );
+    assert( p->pManFraig->nAsserts == pTemp->nAsserts );
+    nTruePis = Aig_ManPiNum(p->pManAig) - Aig_ManRegNum(p->pManAig);
+    memset( p->pMemFraig, 0, sizeof(Aig_Obj_t *) * p->nSizeAlloc * p->nFramesAll );
+    Fra_ObjSetFraig( Aig_ManConst1(p->pManAig), p->pPars->nFramesK, Aig_ManConst1(pTemp) );
+    Aig_ManForEachPiSeq( p->pManAig, pObj, i )
+        Fra_ObjSetFraig( pObj, p->pPars->nFramesK, Aig_ManPi(pTemp,nTruePis*p->pPars->nFramesK+i) );
+    k = 0;
+    assert( Aig_ManRegNum(p->pManAig) == Aig_ManPoNum(pTemp) - pTemp->nAsserts );
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+    {
+        pObjPo = Aig_ManPo(pTemp, pTemp->nAsserts + k++);
+        Fra_ObjSetFraig( pObj, p->pPars->nFramesK, Aig_ObjChild0(pObjPo) );
+    }
+    // exchange
+    Aig_ManStop( p->pManFraig );
+    p->pManFraig = pTemp;
+p->timeRwr += clock() - clk;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs speculative reduction for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Fra_FramesConstrainNode( Aig_Man_t * pManFraig, Aig_Obj_t * pObj, int iFrame )
+{
+    Aig_Obj_t * pObjNew, * pObjNew2, * pObjRepr, * pObjReprNew, * pMiter;
+    // skip nodes without representative
+    if ( (pObjRepr = Fra_ClassObjRepr(pObj)) == NULL )
+        return;
+    assert( pObjRepr->Id < pObj->Id );
+    // get the new node 
+    pObjNew = Fra_ObjFraig( pObj, iFrame );
+    // get the new node of the representative
+    pObjReprNew = Fra_ObjFraig( pObjRepr, iFrame );
+    // if this is the same node, no need to add constraints
+    if ( Aig_Regular(pObjNew) == Aig_Regular(pObjReprNew) )
+        return;
+    // these are different nodes - perform speculative reduction
+    pObjNew2 = Aig_NotCond( pObjReprNew, pObj->fPhase ^ pObjRepr->fPhase );
+    // set the new node
+    Fra_ObjSetFraig( pObj, iFrame, pObjNew2 );
+    // add the constraint
+    pMiter = Aig_Exor( pManFraig, Aig_Regular(pObjNew), Aig_Regular(pObjReprNew) );
+    pMiter = Aig_NotCond( pMiter, Aig_Regular(pMiter)->fPhase ^ Aig_IsComplement(pMiter) );
+    pMiter = Aig_Not( pMiter );
+    Aig_ObjCreatePo( pManFraig, pMiter );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the inductive case with speculative reduction.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FramesWithClasses( Fra_Man_t * p )
+{
+    Aig_Man_t * pManFraig;
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo, * pObjNew;
+    int i, k, f;
+    assert( p->pManFraig == NULL );
+    assert( Aig_ManRegNum(p->pManAig) > 0 );
+    assert( Aig_ManRegNum(p->pManAig) < Aig_ManPiNum(p->pManAig) );
+
+    // start the fraig package
+    pManFraig = Aig_ManStart( Aig_ManObjNumMax(p->pManAig) * p->nFramesAll );
+    pManFraig->pName = Aig_UtilStrsav( p->pManAig->pName );
+    pManFraig->nRegs = p->pManAig->nRegs;
+    // create PI nodes for the frames
+    for ( f = 0; f < p->nFramesAll; f++ )
+        Fra_ObjSetFraig( Aig_ManConst1(p->pManAig), f, Aig_ManConst1(pManFraig) );
+    for ( f = 0; f < p->nFramesAll; f++ )
+        Aig_ManForEachPiSeq( p->pManAig, pObj, i )
+            Fra_ObjSetFraig( pObj, f, Aig_ObjCreatePi(pManFraig) );
+    // create latches for the first frame
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+        Fra_ObjSetFraig( pObj, 0, Aig_ObjCreatePi(pManFraig) );
+
+    // add timeframes
+//    pManFraig->fAddStrash = 1;
+    for ( f = 0; f < p->nFramesAll - 1; f++ )
+    {
+        // set the constraints on the latch outputs
+        Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+            Fra_FramesConstrainNode( pManFraig, pObj, f );
+        // add internal nodes of this frame
+        Aig_ManForEachNode( p->pManAig, pObj, i )
+        {
+            pObjNew = Aig_And( pManFraig, Fra_ObjChild0Fra(pObj,f), Fra_ObjChild1Fra(pObj,f) );
+            Fra_ObjSetFraig( pObj, f, pObjNew );
+            Fra_FramesConstrainNode( pManFraig, pObj, f );
+        }
+        // transfer latch input to the latch outputs 
+        Aig_ManForEachLiLoSeq( p->pManAig, pObjLi, pObjLo, k )
+            Fra_ObjSetFraig( pObjLo, f+1, Fra_ObjChild0Fra(pObjLi,f) );
+    }
+//    pManFraig->fAddStrash = 0;
+    // mark the asserts
+    pManFraig->nAsserts = Aig_ManPoNum(pManFraig);
+    // add the POs for the latch outputs of the last frame
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+        Aig_ObjCreatePo( pManFraig, Fra_ObjFraig(pObj,p->nFramesAll-1) );
+
+    // remove dangling nodes
+    Aig_ManCleanup( pManFraig );
+    // make sure the satisfying assignment is node assigned
+    assert( pManFraig->pData == NULL );
+    return pManFraig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the inductive case with speculative reduction.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_FramesAddMore( Aig_Man_t * p, int nFrames )
+{
+    Aig_Obj_t * pObj, ** pLatches;
+    int i, k, f, nNodesOld;
+    // set copy pointer of each object to point to itself
+    Aig_ManForEachObj( p, pObj, i )
+        pObj->pData = pObj;
+    // iterate and add objects
+    nNodesOld = Aig_ManObjNumMax(p);
+    pLatches = ALLOC( Aig_Obj_t *, Aig_ManRegNum(p) );
+    for ( f = 0; f < nFrames; f++ )
+    {
+        // clean latch inputs and outputs
+        Aig_ManForEachLiSeq( p, pObj, i )
+            pObj->pData = NULL;
+        Aig_ManForEachLoSeq( p, pObj, i )
+            pObj->pData = NULL;
+        // save the latch input values
+        k = 0;
+        Aig_ManForEachLiSeq( p, pObj, i )
+        {
+            if ( Aig_ObjFanin0(pObj)->pData )
+                pLatches[k++] = Aig_ObjChild0Copy(pObj);
+            else
+                pLatches[k++] = NULL;
+        }
+        // insert them as the latch output values
+        k = 0;
+        Aig_ManForEachLoSeq( p, pObj, i )
+            pObj->pData = pLatches[k++];
+        // create the next time frame of nodes
+        Aig_ManForEachNode( p, pObj, i )
+        {
+            if ( i > nNodesOld )
+                break;
+            if ( Aig_ObjFanin0(pObj)->pData && Aig_ObjFanin1(pObj)->pData )
+                pObj->pData = Aig_And( p, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+            else
+                pObj->pData = NULL;
+        }
+    }
+    free( pLatches );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs choicing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FraigInduction( Aig_Man_t * pManAig, int nFramesP, int nFramesK, int nMaxImps, int fRewrite, int fUseImps, int fLatchCorr, int fWriteImps, int fVerbose, int * pnIter )
+{
+    int fUseSimpleCnf = 0;
+    int fUseOldSimulation = 0;
+    // other paramaters affecting performance
+    // - presence of FRAIGing in Abc_NtkDarSeqSweep()
+    // - using distance-1 patterns in Fra_SmlAssignDist1()
+    // - the number of simulation patterns
+    // - the number of BMC frames
+
+    Fra_Man_t * p;
+    Fra_Par_t Pars, * pPars = &Pars; 
+    Aig_Obj_t * pObj;
+    Cnf_Dat_t * pCnf;
+    Aig_Man_t * pManAigNew;
+    int nNodesBeg, nRegsBeg;
+    int nIter, i, clk = clock(), clk2;
+
+    if ( Aig_ManNodeNum(pManAig) == 0 )
+    {
+        if ( pnIter ) *pnIter = 0;
+        return Aig_ManDup(pManAig, 1);
+    }
+    assert( Aig_ManLatchNum(pManAig) == 0 );
+    assert( Aig_ManRegNum(pManAig) > 0 );
+    assert( nFramesK > 0 );
+//Aig_ManShow( pManAig, 0, NULL );
+ 
+    nNodesBeg = Aig_ManNodeNum(pManAig);
+    nRegsBeg  = Aig_ManRegNum(pManAig);
+
+    // enhance the AIG by adding timeframes
+//    Fra_FramesAddMore( pManAig, 3 );
+
+    // get parameters
+    Fra_ParamsDefaultSeq( pPars );
+    pPars->nFramesP   = nFramesP;
+    pPars->nFramesK   = nFramesK;
+    pPars->nMaxImps   = nMaxImps;
+    pPars->fVerbose   = fVerbose;
+    pPars->fRewrite   = fRewrite;
+    pPars->fLatchCorr = fLatchCorr;
+    pPars->fUseImps   = fUseImps;
+    pPars->fWriteImps = fWriteImps;
+
+    // start the fraig manager for this run
+    p = Fra_ManStart( pManAig, pPars );
+    // derive and refine e-classes using K initialized frames
+    if ( fUseOldSimulation )
+    {
+        if ( pPars->nFramesP > 0 )
+        {
+            pPars->nFramesP = 0;
+            printf( "Fra_FraigInduction(): Prefix cannot be used.\n" );
+        }
+        p->pSml = Fra_SmlStart( pManAig, 0, pPars->nFramesK + 1, pPars->nSimWords );
+        Fra_SmlSimulate( p, 1 );
+    }
+    else
+    {
+        // bug:  r iscas/blif/s5378.blif    ; st; ssw -v
+        // bug:  r iscas/blif/s1238.blif    ; st; ssw -v
+        // refine the classes with more simulation rounds
+if ( fVerbose )
+printf( "Simulating %d AIG nodes for %d cycles ... ", Aig_ManNodeNum(pManAig), pPars->nFramesP + 32 );
+        p->pSml = Fra_SmlSimulateSeq( pManAig, pPars->nFramesP, 32, 1 ); //pPars->nFramesK + 1, 1 );  
+if ( fVerbose ) 
+{
+PRT( "Time", clock() - clk );
+}
+        Fra_ClassesPrepare( p->pCla, p->pPars->fLatchCorr );
+//        Fra_ClassesPostprocess( p->pCla );
+        // allocate new simulation manager for simulating counter-examples
+        Fra_SmlStop( p->pSml );
+        p->pSml = Fra_SmlStart( pManAig, 0, pPars->nFramesK + 1, pPars->nSimWords );
+    }
+
+    // select the most expressive implications
+    if ( pPars->fUseImps )
+        p->pCla->vImps = Fra_ImpDerive( p, 5000000, pPars->nMaxImps, pPars->fLatchCorr );
+
+    // perform BMC (for the min number of frames)
+    Fra_BmcPerform( p, pPars->nFramesP, pPars->nFramesK+1 ); // +1 is needed to prevent non-refinement
+//Fra_ClassesPrint( p->pCla, 1 );
+//    if ( p->vCex == NULL )
+//        p->vCex = Vec_IntAlloc( 1000 );
+
+    p->nLitsBeg  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesBeg = nNodesBeg; // Aig_ManNodeNum(pManAig);
+    p->nRegsBeg  = nRegsBeg; // Aig_ManRegNum(pManAig);
+
+    // dump AIG of the timeframes
+//    pManAigNew = Fra_ClassesDeriveAig( p->pCla, pPars->nFramesK );
+//    Aig_ManDumpBlif( pManAigNew, "frame_aig.blif" );
+//    Fra_ManPartitionTest2( pManAigNew );
+//    Aig_ManStop( pManAigNew );
+
+    // iterate the inductive case
+    p->pCla->fRefinement = 1;
+    for ( nIter = 0; p->pCla->fRefinement; nIter++ )
+    {
+        int nLitsOld = Fra_ClassesCountLits(p->pCla);
+        int nImpsOld = p->pCla->vImps? Vec_IntSize(p->pCla->vImps) : 0;
+        // mark the classes as non-refined
+        p->pCla->fRefinement = 0;
+        // derive non-init K-timeframes while implementing e-classes
+clk2 = clock();
+        p->pManFraig = Fra_FramesWithClasses( p );
+p->timeTrav += clock() - clk2;
+//Aig_ManDumpBlif( p->pManFraig, "testaig.blif" );
+
+        // perform AIG rewriting
+        if ( p->pPars->fRewrite )
+            Fra_FraigInductionRewrite( p );
+
+        // convert the manager to SAT solver (the last nLatches outputs are inputs)
+        if ( fUseSimpleCnf || pPars->fUseImps )
+            pCnf = Cnf_DeriveSimple( p->pManFraig, Aig_ManRegNum(p->pManFraig) );
+        else
+            pCnf = Cnf_Derive( p->pManFraig, Aig_ManRegNum(p->pManFraig) );
+//Cnf_DataWriteIntoFile( pCnf, "temp.cnf", 1 );
+
+        p->pSat = Cnf_DataWriteIntoSolver( pCnf );
+        p->nSatVars = pCnf->nVars;
+        assert( p->pSat != NULL );
+        if ( p->pSat == NULL )
+            printf( "Fra_FraigInduction(): Computed CNF is not valid.\n" );
+        if ( pPars->fUseImps )
+        {
+            Fra_ImpAddToSolver( p, p->pCla->vImps, pCnf->pVarNums );
+            if ( p->pSat == NULL )
+                printf( "Fra_FraigInduction(): Adding implicationsn to CNF led to a conflict.\n" );
+        }
+ 
+        // set the pointers to the manager
+        Aig_ManForEachObj( p->pManFraig, pObj, i )
+            pObj->pData = p;
+
+        // prepare solver for fraiging the last timeframe
+        Fra_ManClean( p, Aig_ManObjNumMax(p->pManFraig) + Aig_ManNodeNum(p->pManAig) );
+
+        // transfer PI/LO variable numbers
+        Aig_ManForEachObj( p->pManFraig, pObj, i )
+        {
+            if ( pCnf->pVarNums[pObj->Id] == -1 )
+                continue;
+            Fra_ObjSetSatNum( pObj, pCnf->pVarNums[pObj->Id] );
+            Fra_ObjSetFaninVec( pObj, (void *)1 );
+        }
+        Cnf_DataFree( pCnf );
+
+        // report the intermediate results
+        if ( fVerbose )
+        {
+            printf( "%3d : Const = %6d. Class = %6d.  L = %6d. LR = %6d.  ", 
+                nIter, Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), 
+                Fra_ClassesCountLits(p->pCla), p->pManFraig->nAsserts );
+            if ( p->pCla->vImps )
+                printf( "I = %6d. ", Vec_IntSize(p->pCla->vImps) );
+            printf( "NR = %6d.\n", Aig_ManNodeNum(p->pManFraig) );
+        } 
+
+        // perform sweeping
+        p->nSatCallsRecent = 0;
+        p->nSatCallsSkipped = 0;
+        Fra_FraigSweep( p );
+
+//        Sat_SolverPrintStats( stdout, p->pSat );
+
+        // remove FRAIG and SAT solver
+        Aig_ManStop( p->pManFraig );   p->pManFraig = NULL;
+        sat_solver_delete( p->pSat );  p->pSat = NULL; 
+        memset( p->pMemFraig, 0, sizeof(Aig_Obj_t *) * p->nSizeAlloc * p->nFramesAll );
+//        printf( "Recent SAT called = %d. Skipped = %d.\n", p->nSatCallsRecent, p->nSatCallsSkipped );
+        assert( p->vTimeouts == NULL );
+        if ( p->vTimeouts )
+           printf( "Fra_FraigInduction(): SAT solver timed out!\n" );
+        // check if refinement has happened
+//        p->pCla->fRefinement = (int)(nLitsOld != Fra_ClassesCountLits(p->pCla));
+        if ( p->pCla->fRefinement && 
+            nLitsOld == Fra_ClassesCountLits(p->pCla) && 
+            nImpsOld == (p->pCla->vImps? Vec_IntSize(p->pCla->vImps) : 0) )
+        {
+            printf( "Fra_FraigInduction(): Internal error. The result may not verify.\n" );
+            break;
+        }
+    }
+/*
+    // verify implications using simulation
+    if ( p->pCla->vImps && Vec_IntSize(p->pCla->vImps) )
+    {
+        int Temp, clk = clock();
+        if ( Temp = Fra_ImpVerifyUsingSimulation( p ) )
+            printf( "Implications failing the simulation test = %d (out of %d).  ", Temp, Vec_IntSize(p->pCla->vImps) );
+        else
+            printf( "All %d implications have passed the simulation test.  ", Vec_IntSize(p->pCla->vImps) );
+        PRT( "Time", clock() - clk );
+    }
+*/
+
+    // move the classes into representatives and reduce AIG
+clk2 = clock();
+//    Fra_ClassesPrint( p->pCla, 1 );
+    Fra_ClassesSelectRepr( p->pCla );
+    Fra_ClassesCopyReprs( p->pCla, p->vTimeouts );
+    pManAigNew = Aig_ManDupRepr( pManAig, 0 );
+    // add implications to the manager
+    if ( fWriteImps && p->pCla->vImps && Vec_IntSize(p->pCla->vImps) )
+        Fra_ImpRecordInManager( p, pManAigNew );
+    // cleanup the new manager
+    Aig_ManSeqCleanup( pManAigNew );
+//    Aig_ManCountMergeRegs( pManAigNew );
+p->timeTrav += clock() - clk2;
+p->timeTotal = clock() - clk;
+    // get the final stats
+    p->nLitsEnd  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesEnd = Aig_ManNodeNum(pManAigNew);
+    p->nRegsEnd  = Aig_ManRegNum(pManAigNew);
+    // free the manager
+    Fra_ManStop( p );
+    // check the output
+//    if ( Aig_ManPoNum(pManAigNew) - Aig_ManRegNum(pManAigNew) == 1 )
+//        if ( Aig_ObjChild0( Aig_ManPo(pManAigNew,0) ) == Aig_ManConst0(pManAigNew) )
+//            printf( "Proved output constant 0.\n" );
+    if ( pnIter ) *pnIter = nIter;
+    return pManAigNew;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraLcr.c b/abc70930/src/aig/fra/fraLcr.c
new file mode 100644
index 00000000..50fd6687
--- /dev/null
+++ b/abc70930/src/aig/fra/fraLcr.c
@@ -0,0 +1,655 @@
+/**CFile****************************************************************
+
+  FileName    [fraLcorr.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Latch correspondence computation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraLcorr.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Fra_Lcr_t_    Fra_Lcr_t;
+struct Fra_Lcr_t_
+{
+    // original AIG
+    Aig_Man_t *      pAig;
+    // equivalence class representation
+    Fra_Cla_t *      pCla;       
+    // partitioning information
+    Vec_Ptr_t *      vParts;        // output partitions
+    int *            pInToOutPart;  // mapping of PI num into PO partition num
+    int *            pInToOutNum;   // mapping of PI num into the num of this PO in the partition
+    // AIGs for the partitions
+    Vec_Ptr_t *      vFraigs;
+    // other variables
+    int              fRefining; 
+    // parameters
+    int              nFramesP;
+    int              fVerbose;
+    // statistics
+    int              nIters;
+    int              nLitsBeg;
+    int              nLitsEnd;
+    int              nNodesBeg;
+    int              nNodesEnd;
+    int              nRegsBeg;
+    int              nRegsEnd;
+    // runtime
+    int              timeSim;
+    int              timePart;
+    int              timeTrav;
+    int              timeFraig;
+    int              timeUpdate;
+    int              timeTotal;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the retiming manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Lcr_t * Lcr_ManAlloc( Aig_Man_t * pAig )
+{
+    Fra_Lcr_t * p;
+    p = ALLOC( Fra_Lcr_t, 1 );
+    memset( p, 0, sizeof(Fra_Lcr_t) );
+    p->pAig = pAig;
+    p->pInToOutPart = ALLOC( int, Aig_ManPiNum(pAig) );
+    memset( p->pInToOutPart, 0, sizeof(int) * Aig_ManPiNum(pAig) );
+    p->pInToOutNum = ALLOC( int, Aig_ManPiNum(pAig) );
+    memset( p->pInToOutNum, 0, sizeof(int) * Aig_ManPiNum(pAig) );
+    p->vFraigs = Vec_PtrAlloc( 1000 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints stats for the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Lcr_ManPrint( Fra_Lcr_t * p )
+{
+    printf( "Iterations = %d.  LitBeg = %d.  LitEnd = %d. (%6.2f %%).\n", 
+        p->nIters, p->nLitsBeg, p->nLitsEnd, 100.0*p->nLitsEnd/p->nLitsBeg );
+    printf( "NBeg = %d. NEnd = %d. (Gain = %6.2f %%).  RBeg = %d. REnd = %d. (Gain = %6.2f %%).\n", 
+        p->nNodesBeg, p->nNodesEnd, 100.0*(p->nNodesBeg-p->nNodesEnd)/p->nNodesBeg, 
+        p->nRegsBeg, p->nRegsEnd, 100.0*(p->nRegsBeg-p->nRegsEnd)/p->nRegsBeg );
+    PRT( "AIG simulation  ", p->timeSim  );
+    PRT( "AIG partitioning", p->timePart );
+    PRT( "AIG rebuiding   ", p->timeTrav );
+    PRT( "FRAIGing        ", p->timeFraig );
+    PRT( "AIG updating    ", p->timeUpdate );
+    PRT( "TOTAL RUNTIME   ", p->timeTotal );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates the retiming manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Lcr_ManFree( Fra_Lcr_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    if ( p->fVerbose )
+        Lcr_ManPrint( p );
+    Aig_ManForEachPi( p->pAig, pObj, i )
+        pObj->pNext = NULL;
+    Vec_PtrFree( p->vFraigs );
+    if ( p->pCla  )     Fra_ClassesStop( p->pCla );
+    if ( p->vParts  )   Vec_VecFree( (Vec_Vec_t *)p->vParts );
+    free( p->pInToOutPart );
+    free( p->pInToOutNum );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepare the AIG for class computation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Man_t * Fra_LcrAigPrepare( Aig_Man_t * pAig )
+{
+    Fra_Man_t * p;
+    Aig_Obj_t * pObj;
+    int i;
+    p = ALLOC( Fra_Man_t, 1 );
+    memset( p, 0, sizeof(Fra_Man_t) );
+    Aig_ManForEachPi( pAig, pObj, i )
+        pObj->pData = p;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepare the AIG for class computation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_LcrAigPrepareTwo( Aig_Man_t * pAig, Fra_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachPi( pAig, pObj, i )
+        pObj->pData = p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compares two nodes for equivalence after partitioned fraiging.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_LcrNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 )
+{
+    Fra_Man_t * pTemp = pObj0->pData;
+    Fra_Lcr_t * pLcr = (Fra_Lcr_t *)pTemp->pBmc;
+    Aig_Man_t * pFraig;
+    Aig_Obj_t * pOut0, * pOut1;
+    int nPart0, nPart1;
+    assert( Aig_ObjIsPi(pObj0) );
+    assert( Aig_ObjIsPi(pObj1) );
+    // find the partition to which these nodes belong
+    nPart0 = pLcr->pInToOutPart[(int)pObj0->pNext];
+    nPart1 = pLcr->pInToOutPart[(int)pObj1->pNext];
+    // if this is the result of refinement of the class created const-1 nodes
+    // the nodes may end up in different partions - we assume them equivalent
+    if ( nPart0 != nPart1 )
+    {
+        assert( 0 );
+        return 1;
+    }
+    assert( nPart0 == nPart1 );
+    pFraig = Vec_PtrEntry( pLcr->vFraigs, nPart0 );
+    // get the fraig outputs
+    pOut0 = Aig_ManPo( pFraig, pLcr->pInToOutNum[(int)pObj0->pNext] );
+    pOut1 = Aig_ManPo( pFraig, pLcr->pInToOutNum[(int)pObj1->pNext] );
+    return Aig_ObjFanin0(pOut0) == Aig_ObjFanin0(pOut1);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compares the node with a constant after partioned fraiging.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_LcrNodeIsConst( Aig_Obj_t * pObj )
+{
+    Fra_Man_t * pTemp = pObj->pData;
+    Fra_Lcr_t * pLcr = (Fra_Lcr_t *)pTemp->pBmc;
+    Aig_Man_t * pFraig;
+    Aig_Obj_t * pOut;
+    int nPart;
+    assert( Aig_ObjIsPi(pObj) );
+    // find the partition to which these nodes belong
+    nPart = pLcr->pInToOutPart[(int)pObj->pNext];
+    pFraig = Vec_PtrEntry( pLcr->vFraigs, nPart );
+    // get the fraig outputs
+    pOut = Aig_ManPo( pFraig, pLcr->pInToOutNum[(int)pObj->pNext] );
+    return Aig_ObjFanin0(pOut) == Aig_ManConst1(pFraig);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Give the AIG and classes, reduces AIG for partitioning.]
+
+  Description [Ignores registers that are not in the classes. 
+  Places candidate equivalent classes of registers into single outputs 
+  (for ease of partitioning). The resulting combinational AIG contains 
+  outputs in the same order as equivalence classes of registers, 
+  followed by constant-1 registers. Preserves the set of all inputs.
+  Complemented attributes of the outputs do not matter because we need 
+  then only for collecting the structural info.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_LcrDeriveAigForPartitioning( Fra_Lcr_t * pLcr )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj, * pObjPo, * pObjNew, ** ppClass, * pMiter;
+    int i, c, Offset;
+    // remember the numbers of the inputs of the original AIG
+    Aig_ManForEachPi( pLcr->pAig, pObj, i )
+    {
+        pObj->pData = pLcr;
+        pObj->pNext = (Aig_Obj_t *)i;
+    }
+    // compute the LO/LI offset
+    Offset = Aig_ManPoNum(pLcr->pAig) - Aig_ManPiNum(pLcr->pAig);
+    // create the PIs
+    Aig_ManCleanData( pLcr->pAig );
+    pNew = Aig_ManStartFrom( pLcr->pAig );
+    // go over the equivalence classes
+    Vec_PtrForEachEntry( pLcr->pCla->vClasses, ppClass, i )
+    {
+        pMiter = Aig_ManConst0(pNew);
+        for ( c = 0; ppClass[c]; c++ )
+        {
+            assert( Aig_ObjIsPi(ppClass[c]) );
+            pObjPo  = Aig_ManPo( pLcr->pAig, Offset+(int)ppClass[c]->pNext );
+            pObjNew = Aig_ManDup_rec( pNew, pLcr->pAig, Aig_ObjFanin0(pObjPo) );
+            pMiter  = Aig_Exor( pNew, pMiter, pObjNew );
+        }
+        Aig_ObjCreatePo( pNew, pMiter );
+    }
+    // go over the constant candidates
+    Vec_PtrForEachEntry( pLcr->pCla->vClasses1, pObj, i )
+    {
+        assert( Aig_ObjIsPi(pObj) );
+        pObjPo = Aig_ManPo( pLcr->pAig, Offset+(int)pObj->pNext );
+        pMiter = Aig_ManDup_rec( pNew, pLcr->pAig, Aig_ObjFanin0(pObjPo) );
+        Aig_ObjCreatePo( pNew, pMiter );
+    }
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Remaps partitions into the inputs of original AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_LcrRemapPartitions( Vec_Ptr_t * vParts, Fra_Cla_t * pCla, int * pInToOutPart, int * pInToOutNum )
+{
+    Vec_Int_t * vOne, * vOneNew;
+    Aig_Obj_t ** ppClass, * pObjPi;
+    int Out, Offset, i, k, c;
+    // compute the LO/LI offset
+    Offset = Aig_ManPoNum(pCla->pAig) - Aig_ManPiNum(pCla->pAig);
+    Vec_PtrForEachEntry( vParts, vOne, i )
+    {
+        vOneNew = Vec_IntAlloc( Vec_IntSize(vOne) );
+        Vec_IntForEachEntry( vOne, Out, k )
+        {
+            if ( Out < Vec_PtrSize(pCla->vClasses) )
+            {
+                ppClass = Vec_PtrEntry( pCla->vClasses, Out );
+                for ( c = 0; ppClass[c]; c++ )
+                {
+                    pInToOutPart[(int)ppClass[c]->pNext] = i;
+                    pInToOutNum[(int)ppClass[c]->pNext] = Vec_IntSize(vOneNew);
+                    Vec_IntPush( vOneNew, Offset+(int)ppClass[c]->pNext );
+                }
+            }
+            else
+            {
+                pObjPi = Vec_PtrEntry( pCla->vClasses1, Out - Vec_PtrSize(pCla->vClasses) );
+                pInToOutPart[(int)pObjPi->pNext] = i;
+                pInToOutNum[(int)pObjPi->pNext] = Vec_IntSize(vOneNew);
+                Vec_IntPush( vOneNew, Offset+(int)pObjPi->pNext );
+            }
+        }
+        // replace the class
+        Vec_PtrWriteEntry( vParts, i, vOneNew );
+        Vec_IntFree( vOne );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AIG of one partition with speculative reduction.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Fra_LcrCreatePart_rec( Fra_Cla_t * pCla, Aig_Man_t * pNew, Aig_Man_t * p, Aig_Obj_t * pObj )
+{
+    assert( !Aig_IsComplement(pObj) );
+    if ( Aig_ObjIsTravIdCurrent(p, pObj) )
+        return pObj->pData;
+    Aig_ObjSetTravIdCurrent(p, pObj);
+    if ( Aig_ObjIsPi(pObj) )
+    {
+//        Aig_Obj_t * pRepr = Fra_ClassObjRepr(pObj);
+        Aig_Obj_t * pRepr = pCla->pMemRepr[pObj->Id];
+        if ( pRepr == NULL )
+            pObj->pData = Aig_ObjCreatePi( pNew );
+        else
+        {
+            pObj->pData = Fra_LcrCreatePart_rec( pCla, pNew, p, pRepr );
+            pObj->pData = Aig_NotCond( pObj->pData, pRepr->fPhase ^ pObj->fPhase );
+        }
+        return pObj->pData;
+    }
+    Fra_LcrCreatePart_rec( pCla, pNew, p, Aig_ObjFanin0(pObj) );
+    Fra_LcrCreatePart_rec( pCla, pNew, p, Aig_ObjFanin1(pObj) );
+    return pObj->pData = Aig_And( pNew, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AIG of one partition with speculative reduction.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_LcrCreatePart( Fra_Lcr_t * p, Vec_Int_t * vPart )
+{
+    Aig_Man_t * pNew;
+    Aig_Obj_t * pObj, * pObjNew;
+    int Out, i;
+    // create new AIG for this partition
+    pNew = Aig_ManStartFrom( p->pAig );
+    Aig_ManIncrementTravId( p->pAig );
+    Aig_ObjSetTravIdCurrent( p->pAig, Aig_ManConst1(p->pAig) );
+    Aig_ManConst1(p->pAig)->pData = Aig_ManConst1(pNew);
+    Vec_IntForEachEntry( vPart, Out, i )
+    {
+        pObj = Aig_ManPo( p->pAig, Out );
+        if ( pObj->fMarkA )
+        {
+            pObjNew = Fra_LcrCreatePart_rec( p->pCla, pNew, p->pAig, Aig_ObjFanin0(pObj) );
+            pObjNew = Aig_NotCond( pObjNew, Aig_ObjFaninC0(pObj) );
+        }
+        else
+            pObjNew = Aig_ManConst1( pNew );
+        Aig_ObjCreatePo( pNew, pObjNew ); 
+    }
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Marks the nodes belonging to the equivalence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassNodesMark( Fra_Lcr_t * p )
+{
+    Aig_Obj_t * pObj, ** ppClass;
+    int i, c, Offset;
+    // compute the LO/LI offset
+    Offset = Aig_ManPoNum(p->pCla->pAig) - Aig_ManPiNum(p->pCla->pAig);
+    // mark the nodes remaining in the classes
+    Vec_PtrForEachEntry( p->pCla->vClasses1, pObj, i )
+    {
+        pObj = Aig_ManPo( p->pCla->pAig, Offset+(int)pObj->pNext );
+        pObj->fMarkA = 1;
+    }
+    Vec_PtrForEachEntry( p->pCla->vClasses, ppClass, i )
+    {
+        for ( c = 0; ppClass[c]; c++ )
+        {
+            pObj = Aig_ManPo( p->pCla->pAig, Offset+(int)ppClass[c]->pNext );
+            pObj->fMarkA = 1;
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Unmarks the nodes belonging to the equivalence classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ClassNodesUnmark( Fra_Lcr_t * p )
+{
+    Aig_Obj_t * pObj, ** ppClass;
+    int i, c, Offset;
+    // compute the LO/LI offset
+    Offset = Aig_ManPoNum(p->pCla->pAig) - Aig_ManPiNum(p->pCla->pAig);
+    // mark the nodes remaining in the classes
+    Vec_PtrForEachEntry( p->pCla->vClasses1, pObj, i )
+    {
+        pObj = Aig_ManPo( p->pCla->pAig, Offset+(int)pObj->pNext );
+        pObj->fMarkA = 0;
+    }
+    Vec_PtrForEachEntry( p->pCla->vClasses, ppClass, i )
+    {
+        for ( c = 0; ppClass[c]; c++ )
+        {
+            pObj = Aig_ManPo( p->pCla->pAig, Offset+(int)ppClass[c]->pNext );
+            pObj->fMarkA = 0;
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs choicing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_FraigLatchCorrespondence( Aig_Man_t * pAig, int nFramesP, int nConfMax, int fProve, int fVerbose, int * pnIter )
+{
+    int nPartSize    = 200;
+    int fReprSelect  = 0;
+
+    Fra_Lcr_t * p;
+    Fra_Sml_t * pSml;
+    Fra_Man_t * pTemp;
+    Aig_Man_t * pAigPart, * pAigNew = NULL;
+    Vec_Int_t * vPart;
+//    Aig_Obj_t * pObj = Aig_ManObj(pAig, 2078);
+    int i, nIter, timeSim, clk = clock(), clk2, clk3;
+    if ( Aig_ManNodeNum(pAig) == 0 )
+    {
+        if ( pnIter ) *pnIter = 0;
+        return Aig_ManDup(pAig, 1);
+    }
+    assert( Aig_ManLatchNum(pAig) == 0 );
+    assert( Aig_ManRegNum(pAig) > 0 );
+
+    // simulate the AIG 
+clk2 = clock();
+if ( fVerbose )
+printf( "Simulating AIG with %d nodes for %d cycles ...  ", Aig_ManNodeNum(pAig), nFramesP + 32 );
+    pSml = Fra_SmlSimulateSeq( pAig, nFramesP, 32, 1 ); 
+if ( fVerbose ) 
+{
+PRT( "Time", clock() - clk2 );
+timeSim = clock() - clk2;
+}
+    // check if simulation discovered non-constant-0 POs
+    if ( fProve && pSml->fNonConstOut )
+    {
+        Fra_SmlStop( pSml );
+        return NULL;
+    }
+
+    // start the manager
+    p = Lcr_ManAlloc( pAig );
+    p->nFramesP = nFramesP;
+    p->fVerbose = fVerbose;
+    p->timeSim += timeSim;
+
+    pTemp = Fra_LcrAigPrepare( pAig );
+    pTemp->pBmc = (Fra_Bmc_t *)p;
+    pTemp->pSml = pSml;
+
+    // get preliminary info about equivalence classes
+    pTemp->pCla = p->pCla = Fra_ClassesStart( p->pAig );
+    Fra_ClassesPrepare( p->pCla, 1 );
+    p->pCla->pFuncNodeIsConst   = Fra_LcrNodeIsConst;
+    p->pCla->pFuncNodesAreEqual = Fra_LcrNodesAreEqual;
+    Fra_SmlStop( pTemp->pSml );
+
+    // partition the AIG for latch correspondence computation
+clk2 = clock();
+if ( fVerbose )
+printf( "Partitioning AIG ...  " );
+    pAigPart = Fra_LcrDeriveAigForPartitioning( p );
+    p->vParts = (Vec_Ptr_t *)Aig_ManPartitionSmart( pAigPart, nPartSize, 0, NULL );
+    Fra_LcrRemapPartitions( p->vParts, p->pCla, p->pInToOutPart, p->pInToOutNum );
+    Aig_ManStop( pAigPart );
+if ( fVerbose ) 
+{
+PRT( "Time", clock() - clk2 );
+p->timePart += clock() - clk2;
+}
+
+    // get the initial stats
+    p->nLitsBeg  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesBeg = Aig_ManNodeNum(p->pAig);
+    p->nRegsBeg  = Aig_ManRegNum(p->pAig);
+
+    // perforn interative reduction of the partitions
+    p->fRefining = 1;
+    for ( nIter = 0; p->fRefining; nIter++ )
+    {
+        p->fRefining = 0;
+        clk3 = clock();
+        // derive AIGs for each partition
+        Fra_ClassNodesMark( p );
+        Vec_PtrClear( p->vFraigs );
+        Vec_PtrForEachEntry( p->vParts, vPart, i )
+        {
+clk2 = clock();
+            pAigPart = Fra_LcrCreatePart( p, vPart );
+p->timeTrav += clock() - clk2;
+clk2 = clock();
+            pAigNew  = Fra_FraigEquivence( pAigPart, nConfMax );
+p->timeFraig += clock() - clk2;
+            Vec_PtrPush( p->vFraigs, pAigNew );
+            Aig_ManStop( pAigPart );
+        }
+        Fra_ClassNodesUnmark( p );
+        // report the intermediate results
+        if ( fVerbose )
+        {
+            printf( "%3d : Const = %6d. Class = %6d.  L = %6d. Part = %3d.  ", 
+                nIter, Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), 
+                Fra_ClassesCountLits(p->pCla), Vec_PtrSize(p->vParts) );
+            PRT( "T", clock() - clk3 );
+        }
+        // refine the classes
+        Fra_LcrAigPrepareTwo( p->pAig, pTemp );
+        if ( Fra_ClassesRefine( p->pCla ) )
+            p->fRefining = 1;
+        if ( Fra_ClassesRefine1( p->pCla, 0, NULL ) )
+            p->fRefining = 1;
+        // clean the fraigs
+        Vec_PtrForEachEntry( p->vFraigs, pAigPart, i )
+            Aig_ManStop( pAigPart );
+
+        // repartition if needed
+        if ( 1 )
+        {
+clk2 = clock();
+            Vec_VecFree( (Vec_Vec_t *)p->vParts );
+            pAigPart = Fra_LcrDeriveAigForPartitioning( p );
+            p->vParts = (Vec_Ptr_t *)Aig_ManPartitionSmart( pAigPart, nPartSize, 0, NULL );
+            Fra_LcrRemapPartitions( p->vParts, p->pCla, p->pInToOutPart, p->pInToOutNum );
+            Aig_ManStop( pAigPart );
+p->timePart += clock() - clk2;
+        }
+    }
+    free( pTemp );
+    p->nIters = nIter;
+
+    // move the classes into representatives and reduce AIG
+clk2 = clock();
+//    Fra_ClassesPrint( p->pCla, 1 );
+    if ( fReprSelect )
+        Fra_ClassesSelectRepr( p->pCla );
+    Fra_ClassesCopyReprs( p->pCla, NULL );
+    pAigNew = Aig_ManDupRepr( p->pAig, 0 );
+    Aig_ManSeqCleanup( pAigNew );
+//    Aig_ManCountMergeRegs( pAigNew );
+p->timeUpdate += clock() - clk2;
+p->timeTotal = clock() - clk;
+    // get the final stats
+    p->nLitsEnd  = Fra_ClassesCountLits( p->pCla );
+    p->nNodesEnd = Aig_ManNodeNum(pAigNew);
+    p->nRegsEnd  = Aig_ManRegNum(pAigNew);
+    Lcr_ManFree( p );
+    if ( pnIter ) *pnIter = nIter;
+    return pAigNew;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraMan.c b/abc70930/src/aig/fra/fraMan.c
new file mode 100644
index 00000000..f505b0c2
--- /dev/null
+++ b/abc70930/src/aig/fra/fraMan.c
@@ -0,0 +1,304 @@
+/**CFile****************************************************************
+
+  FileName    [fraMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Starts the FRAIG manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraMan.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the default solving parameters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ParamsDefault( Fra_Par_t * pPars )
+{
+    memset( pPars, 0, sizeof(Fra_Par_t) );
+    pPars->nSimWords        =       32;  // the number of words in the simulation info
+    pPars->dSimSatur        =    0.005;  // the ratio of refined classes when saturation is reached
+    pPars->fPatScores       =        0;  // enables simulation pattern scoring
+    pPars->MaxScore         =       25;  // max score after which resimulation is used
+    pPars->fDoSparse        =        1;  // skips sparse functions
+//    pPars->dActConeRatio    =     0.05;  // the ratio of cone to be bumped
+//    pPars->dActConeBumpMax  =      5.0;  // the largest bump of activity
+    pPars->dActConeRatio    =      0.3;  // the ratio of cone to be bumped
+    pPars->dActConeBumpMax  =     10.0;  // the largest bump of activity
+    pPars->nBTLimitNode     =      100;  // conflict limit at a node
+    pPars->nBTLimitMiter    =   500000;  // conflict limit at an output
+    pPars->nFramesK         =        0;  // the number of timeframes to unroll
+    pPars->fConeBias        =        1;
+    pPars->fRewrite         =        0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the default solving parameters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ParamsDefaultSeq( Fra_Par_t * pPars )
+{
+    memset( pPars, 0, sizeof(Fra_Par_t) );
+    pPars->nSimWords        =        1;  // the number of words in the simulation info
+    pPars->dSimSatur        =    0.005;  // the ratio of refined classes when saturation is reached
+    pPars->fPatScores       =        0;  // enables simulation pattern scoring
+    pPars->MaxScore         =       25;  // max score after which resimulation is used
+    pPars->fDoSparse        =        1;  // skips sparse functions
+    pPars->dActConeRatio    =      0.3;  // the ratio of cone to be bumped
+    pPars->dActConeBumpMax  =     10.0;  // the largest bump of activity
+    pPars->nBTLimitNode     = 10000000;  // conflict limit at a node
+    pPars->nBTLimitMiter    =   500000;  // conflict limit at an output
+    pPars->nFramesK         =        1;  // the number of timeframes to unroll
+    pPars->fConeBias        =        0;
+    pPars->fRewrite         =        0;
+    pPars->fLatchCorr       =        0;
+} 
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Man_t * Fra_ManStart( Aig_Man_t * pManAig, Fra_Par_t * pPars )
+{
+    Fra_Man_t * p;
+    Aig_Obj_t * pObj;
+    int i;
+    // allocate the fraiging manager
+    p = ALLOC( Fra_Man_t, 1 );
+    memset( p, 0, sizeof(Fra_Man_t) );
+    p->pPars      = pPars;
+    p->pManAig    = pManAig;
+    p->nSizeAlloc = Aig_ManObjNumMax( pManAig );
+    p->nFramesAll = pPars->nFramesK + 1;
+    // allocate storage for sim pattern
+    p->nPatWords  = Aig_BitWordNum( (Aig_ManPiNum(pManAig) - Aig_ManRegNum(pManAig)) * p->nFramesAll + Aig_ManRegNum(pManAig) );
+    p->pPatWords  = ALLOC( unsigned, p->nPatWords ); 
+    p->vPiVars    = Vec_PtrAlloc( 100 );
+    // equivalence classes
+    p->pCla       = Fra_ClassesStart( pManAig );
+    // allocate other members
+    p->pMemFraig  = ALLOC( Aig_Obj_t *, p->nSizeAlloc * p->nFramesAll );
+    memset( p->pMemFraig, 0, sizeof(Aig_Obj_t *) * p->nSizeAlloc * p->nFramesAll );
+    // set random number generator
+    srand( 0xABCABC );
+    // set the pointer to the manager
+    Aig_ManForEachObj( p->pManAig, pObj, i )
+        pObj->pData = p;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManClean( Fra_Man_t * p, int nNodesMax )
+{
+    int i;
+    // remove old arrays
+    for ( i = 0; i < p->nMemAlloc; i++ )
+        if ( p->pMemFanins[i] && p->pMemFanins[i] != (void *)1 )
+            Vec_PtrFree( p->pMemFanins[i] );
+    // realloc for the new size
+    if ( p->nMemAlloc < nNodesMax )
+    {
+        int nMemAllocNew = nNodesMax + 5000;
+        p->pMemFanins = REALLOC( Vec_Ptr_t *, p->pMemFanins, nMemAllocNew );
+        p->pMemSatNums = REALLOC( int, p->pMemSatNums, nMemAllocNew );
+        p->nMemAlloc = nMemAllocNew;
+    }
+    // prepare for the new run
+    memset( p->pMemFanins, 0, sizeof(Vec_Ptr_t *) * p->nMemAlloc );
+    memset( p->pMemSatNums, 0, sizeof(int) * p->nMemAlloc );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares the new manager to begin fraiging.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Fra_ManPrepareComb( Fra_Man_t * p )
+{
+    Aig_Man_t * pManFraig;
+    Aig_Obj_t * pObj;
+    int i;
+    assert( p->pManFraig == NULL );
+    // start the fraig package
+    pManFraig = Aig_ManStart( Aig_ManObjNumMax(p->pManAig) );
+    pManFraig->pName = Aig_UtilStrsav( p->pManAig->pName );
+    pManFraig->nRegs    = p->pManAig->nRegs;
+    pManFraig->nAsserts = p->pManAig->nAsserts;
+    // set the pointers to the available fraig nodes
+    Fra_ObjSetFraig( Aig_ManConst1(p->pManAig), 0, Aig_ManConst1(pManFraig) );
+    Aig_ManForEachPi( p->pManAig, pObj, i )
+        Fra_ObjSetFraig( pObj, 0, Aig_ObjCreatePi(pManFraig) );
+    // set the pointers to the manager
+    Aig_ManForEachObj( pManFraig, pObj, i )
+        pObj->pData = p;
+    // allocate memory for mapping FRAIG nodes into SAT numbers and fanins
+    p->nMemAlloc = p->nSizeAlloc;
+    p->pMemFanins = ALLOC( Vec_Ptr_t *, p->nMemAlloc );
+    memset( p->pMemFanins, 0, sizeof(Vec_Ptr_t *) * p->nMemAlloc );
+    p->pMemSatNums = ALLOC( int, p->nMemAlloc );
+    memset( p->pMemSatNums, 0, sizeof(int) * p->nMemAlloc );
+    // make sure the satisfying assignment is node assigned
+    assert( pManFraig->pData == NULL );
+    return pManFraig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finalizes the combinational miter after fraiging.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManFinalizeComb( Fra_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    // add the POs
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+        Aig_ObjCreatePo( p->pManFraig, Fra_ObjChild0Fra(pObj,0) );
+    // postprocess
+    Aig_ManCleanMarkB( p->pManFraig );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManStop( Fra_Man_t * p )
+{
+    if ( p->pPars->fVerbose )
+        Fra_ManPrint( p );
+    // save mapping from original nodes into FRAIG nodes
+    if ( p->pManAig )
+    {
+        if ( p->pManAig->pObjCopies )
+            free( p->pManAig->pObjCopies );
+        p->pManAig->pObjCopies = p->pMemFraig;
+        p->pMemFraig = NULL;
+    }
+    Fra_ManClean( p, 0 );
+    if ( p->vTimeouts ) Vec_PtrFree( p->vTimeouts );
+    if ( p->vPiVars )   Vec_PtrFree( p->vPiVars );
+    if ( p->pSat )      sat_solver_delete( p->pSat );
+    if ( p->pCla  )     Fra_ClassesStop( p->pCla );
+    if ( p->pSml )      Fra_SmlStop( p->pSml );
+    if ( p->vCex )      Vec_IntFree( p->vCex );
+    FREE( p->pMemFraig );
+    FREE( p->pMemFanins );
+    FREE( p->pMemSatNums );
+    FREE( p->pPatWords );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints stats for the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManPrint( Fra_Man_t * p )
+{
+    double nMemory = 1.0*Aig_ManObjNumMax(p->pManAig)*(p->pSml->nWordsTotal*sizeof(unsigned)+6*sizeof(void*))/(1<<20);
+    printf( "SimWord = %d. Round = %d.  Mem = %0.2f Mb.  LitBeg = %d.  LitEnd = %d. (%6.2f %%).\n", 
+        p->pPars->nSimWords, p->pSml->nSimRounds, nMemory, p->nLitsBeg, p->nLitsEnd, 100.0*p->nLitsEnd/(p->nLitsBeg?p->nLitsBeg:1) );
+    printf( "Proof = %d. Cex = %d. Fail = %d. FailReal = %d. C-lim = %d. ImpRatio = %6.2f %%\n", 
+        p->nSatProof, p->nSatCallsSat, p->nSatFails, p->nSatFailsReal, p->pPars->nBTLimitNode, Fra_ImpComputeStateSpaceRatio(p) );
+    printf( "NBeg = %d. NEnd = %d. (Gain = %6.2f %%).  RBeg = %d. REnd = %d. (Gain = %6.2f %%).\n", 
+        p->nNodesBeg, p->nNodesEnd, 100.0*(p->nNodesBeg-p->nNodesEnd)/(p->nNodesBeg?p->nNodesBeg:1), 
+        p->nRegsBeg, p->nRegsEnd, 100.0*(p->nRegsBeg-p->nRegsEnd)/(p->nRegsBeg?p->nRegsBeg:1) );
+    if ( p->pSat ) Sat_SolverPrintStats( stdout, p->pSat );
+    PRT( "AIG simulation  ", p->pSml->timeSim  );
+    PRT( "AIG traversal   ", p->timeTrav );
+    if ( p->timeRwr )
+    {
+    PRT( "AIG rewriting   ", p->timeRwr  );
+    }
+    PRT( "SAT solving     ", p->timeSat  );
+    PRT( "    Unsat       ", p->timeSatUnsat );
+    PRT( "    Sat         ", p->timeSatSat   );
+    PRT( "    Fail        ", p->timeSatFail  );
+    PRT( "Class refining  ", p->timeRef   );
+    PRT( "TOTAL RUNTIME   ", p->timeTotal );
+    if ( p->time1 ) { PRT( "time1           ", p->time1 ); }
+    if ( p->nSpeculs )
+    printf( "Speculations = %d.\n", p->nSpeculs );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraPart.c b/abc70930/src/aig/fra/fraPart.c
new file mode 100644
index 00000000..691b2b3d
--- /dev/null
+++ b/abc70930/src/aig/fra/fraPart.c
@@ -0,0 +1,263 @@
+/**CFile****************************************************************
+
+  FileName    [fraPart.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Partitioning for induction.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraPart.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManPartitionTest( Aig_Man_t * p, int nComLim )
+{
+    Bar_Progress_t * pProgress;
+    Vec_Vec_t * vSupps, * vSuppsIn;
+    Vec_Ptr_t * vSuppsNew;
+    Vec_Int_t * vSupNew, * vSup, * vSup2, * vTemp;//, * vSupIn;
+    Vec_Int_t * vOverNew, * vQuantNew;
+    Aig_Obj_t * pObj;
+    int i, k, nCommon, CountOver, CountQuant;
+    int nTotalSupp, nTotalSupp2, Entry, Largest;//, iVar;
+    double Ratio, R;
+    int clk;
+
+    nTotalSupp = 0;
+    nTotalSupp2 = 0;
+    Ratio = 0.0;
+ 
+    // compute supports
+clk = clock();
+    vSupps = (Vec_Vec_t *)Aig_ManSupports( p );
+PRT( "Supports", clock() - clk );
+    // remove last entry
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        vSup = Vec_VecEntry( vSupps, i );
+        Vec_IntPop( vSup );
+        // remember support
+//        pObj->pNext = (Aig_Obj_t *)vSup;
+    }
+
+    // create reverse supports
+clk = clock();
+    vSuppsIn = Vec_VecStart( Aig_ManPiNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        vSup = Vec_VecEntry( vSupps, i );
+        Vec_IntForEachEntry( vSup, Entry, k )
+            Vec_VecPush( vSuppsIn, Entry, (void *)i );
+    }
+PRT( "Inverse ", clock() - clk );
+
+clk = clock();
+    // compute extended supports
+    Largest = 0;
+    vSuppsNew = Vec_PtrAlloc( Aig_ManPoNum(p) );
+    vOverNew  = Vec_IntAlloc( Aig_ManPoNum(p) );
+    vQuantNew = Vec_IntAlloc( Aig_ManPoNum(p) );
+    pProgress = Bar_ProgressStart( stdout, Aig_ManPoNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        Bar_ProgressUpdate( pProgress, i, NULL );
+        // get old supports
+        vSup = Vec_VecEntry( vSupps, i );
+        if ( Vec_IntSize(vSup) < 2 )
+            continue;
+        // compute new supports
+        CountOver = CountQuant = 0;
+        vSupNew = Vec_IntDup( vSup );
+        // go through the nodes where the first var appears
+        Aig_ManForEachPo( p, pObj, k )
+//        iVar = Vec_IntEntry( vSup, 0 );
+//        vSupIn = Vec_VecEntry( vSuppsIn, iVar );
+//        Vec_IntForEachEntry( vSupIn, Entry, k )
+        {
+//            pObj = Aig_ManObj( p, Entry );
+            // get support of this output
+//            vSup2 = (Vec_Int_t *)pObj->pNext;
+            vSup2 = Vec_VecEntry( vSupps, k );
+            // count the number of common vars
+            nCommon = Vec_IntTwoCountCommon(vSup, vSup2);
+            if ( nCommon < 2 )
+                continue;
+            if ( nCommon > nComLim )
+            {
+                vSupNew = Vec_IntTwoMerge( vTemp = vSupNew, vSup2 );
+                Vec_IntFree( vTemp );
+                CountOver++;
+            }
+            else
+                CountQuant++;
+        }
+        // save the results
+        Vec_PtrPush( vSuppsNew, vSupNew );
+        Vec_IntPush( vOverNew, CountOver );
+        Vec_IntPush( vQuantNew, CountQuant );
+
+        if ( Largest < Vec_IntSize(vSupNew) )
+            Largest = Vec_IntSize(vSupNew);
+
+        nTotalSupp  += Vec_IntSize(vSup);
+        nTotalSupp2 += Vec_IntSize(vSupNew);
+        if ( Vec_IntSize(vSup) )
+            R = Vec_IntSize(vSupNew) / Vec_IntSize(vSup);
+        else
+            R = 0;
+        Ratio += R;
+
+        if ( R < 5.0 )
+            continue;
+
+        printf( "%6d : ", i );
+        printf( "S = %5d. ", Vec_IntSize(vSup) );
+        printf( "SNew = %5d. ", Vec_IntSize(vSupNew) );
+        printf( "R = %7.2f. ", R );
+        printf( "Over = %5d. ", CountOver );
+        printf( "Quant = %5d. ", CountQuant );
+        printf( "\n" );
+/*
+        Vec_IntForEachEntry( vSupNew, Entry, k )
+            printf( "%d ", Entry );
+        printf( "\n" );
+*/
+    }
+    Bar_ProgressStop( pProgress );
+PRT( "Scanning", clock() - clk );
+
+    // print cumulative statistics
+    printf( "PIs = %6d. POs = %6d. Lim = %3d.   AveS = %3d. SN = %3d. R = %4.2f Max = %5d.\n",
+        Aig_ManPiNum(p), Aig_ManPoNum(p), nComLim,
+        nTotalSupp/Aig_ManPoNum(p), nTotalSupp2/Aig_ManPoNum(p),
+        Ratio/Aig_ManPoNum(p), Largest );
+
+    Vec_VecFree( vSupps );
+    Vec_VecFree( vSuppsIn );
+    Vec_VecFree( (Vec_Vec_t *)vSuppsNew );
+    Vec_IntFree( vOverNew );
+    Vec_IntFree( vQuantNew );
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_ManPartitionTest2( Aig_Man_t * p )
+{
+    Vec_Vec_t * vSupps, * vSuppsIn;
+    Vec_Int_t * vSup, * vSup2, * vSup3;
+    Aig_Obj_t * pObj;
+    int Entry, Entry2, Entry3, Counter;
+    int i, k, m, n, clk;
+    char * pSupp;
+ 
+    // compute supports
+clk = clock();
+    vSupps = (Vec_Vec_t *)Aig_ManSupports( p );
+PRT( "Supports", clock() - clk );
+    // remove last entry
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        vSup = Vec_VecEntry( vSupps, i );
+        Vec_IntPop( vSup );
+        // remember support
+//        pObj->pNext = (Aig_Obj_t *)vSup;
+    }
+
+    // create reverse supports
+clk = clock();
+    vSuppsIn = Vec_VecStart( Aig_ManPiNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        if ( i == p->nAsserts )
+            break;
+        vSup = Vec_VecEntry( vSupps, i );
+        Vec_IntForEachEntry( vSup, Entry, k )
+            Vec_VecPush( vSuppsIn, Entry, (void *)i );
+    }
+PRT( "Inverse ", clock() - clk );
+
+    // create affective supports
+clk = clock();
+    pSupp = ALLOC( char, Aig_ManPiNum(p) );
+    Aig_ManForEachPo( p, pObj, i )
+    {
+        if ( i % 50 != 0 )
+            continue;
+        vSup = Vec_VecEntry( vSupps, i );
+        memset( pSupp, 0, sizeof(char) * Aig_ManPiNum(p) );
+        // go through each input of this output
+        Vec_IntForEachEntry( vSup, Entry, k )
+        {
+            pSupp[Entry] = 1;
+            vSup2 = Vec_VecEntry( vSuppsIn, Entry );
+            // go though each assert of this input
+            Vec_IntForEachEntry( vSup2, Entry2, m )
+            {
+                vSup3 = Vec_VecEntry( vSupps, Entry2 );
+                // go through each input of this assert
+                Vec_IntForEachEntry( vSup3, Entry3, n )
+                {
+                    pSupp[Entry3] = 1;
+                }
+            }
+        }
+        // count the entries
+        Counter = 0;
+        for ( m = 0; m < Aig_ManPiNum(p); m++ )
+            Counter += pSupp[m];
+        printf( "%d(%d) ", Vec_IntSize(vSup), Counter );
+    }
+    printf( "\n" );
+PRT( "Extension ", clock() - clk );
+
+    free( pSupp );
+    Vec_VecFree( vSupps );
+    Vec_VecFree( vSuppsIn );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraSat.c b/abc70930/src/aig/fra/fraSat.c
new file mode 100644
index 00000000..11029b69
--- /dev/null
+++ b/abc70930/src/aig/fra/fraSat.c
@@ -0,0 +1,452 @@
+/**CFile****************************************************************
+
+  FileName    [fraSat.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraSat.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <math.h>
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static int Fra_SetActivityFactors( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Runs equivalence test for the two nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_NodesAreEquiv( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew )
+{
+    int pLits[4], RetValue, RetValue1, nBTLimit, clk, clk2 = clock();
+    int status;
+
+    // make sure the nodes are not complemented
+    assert( !Aig_IsComplement(pNew) );
+    assert( !Aig_IsComplement(pOld) );
+    assert( pNew != pOld );
+
+    // if at least one of the nodes is a failed node, perform adjustments:
+    // if the backtrack limit is small, simply skip this node
+    // if the backtrack limit is > 10, take the quare root of the limit
+    nBTLimit = p->pPars->nBTLimitNode;
+    if ( !p->pPars->fSpeculate && p->pPars->nFramesK == 0 && (nBTLimit > 0 && (pOld->fMarkB || pNew->fMarkB)) )
+    {
+        p->nSatFails++;
+        // fail immediately
+//        return -1;
+        if ( nBTLimit <= 10 )
+            return -1;
+        nBTLimit = (int)pow(nBTLimit, 0.7);
+    }
+
+    p->nSatCalls++;
+    p->nSatCallsRecent++;
+
+    // make sure the solver is allocated and has enough variables
+    if ( p->pSat == NULL )
+    {
+        p->pSat = sat_solver_new();
+        p->nSatVars = 1;
+        sat_solver_setnvars( p->pSat, 1000 );
+        // var 0 is reserved for const1 node - add the clause
+        pLits[0] = toLit( 0 );
+        sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+    }
+
+    // if the nodes do not have SAT variables, allocate them
+    Fra_CnfNodeAddToSolver( p, pOld, pNew );
+
+    if ( p->pSat->qtail != p->pSat->qhead )
+    {
+        status = sat_solver_simplify(p->pSat);
+        assert( status != 0 );
+        assert( p->pSat->qtail == p->pSat->qhead );
+    }
+
+    // prepare variable activity
+    if ( p->pPars->fConeBias )
+        Fra_SetActivityFactors( p, pOld, pNew ); 
+
+    // solve under assumptions
+    // A = 1; B = 0     OR     A = 1; B = 1 
+clk = clock();
+    pLits[0] = toLitCond( Fra_ObjSatNum(pOld), 0 );
+    pLits[1] = toLitCond( Fra_ObjSatNum(pNew), pOld->fPhase == pNew->fPhase );
+//Sat_SolverWriteDimacs( p->pSat, "temp.cnf", pLits, pLits + 2, 1 );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 2, 
+        (sint64)nBTLimit, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        pLits[1] = lit_neg( pLits[1] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+        // continue solving the other implication
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        Fra_SmlSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        if ( pOld != p->pManFraig->pConst1 ) 
+            pOld->fMarkB = 1;
+        pNew->fMarkB = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+
+    // if the old node was constant 0, we already know the answer
+    if ( pOld == p->pManFraig->pConst1 )
+    {
+        p->nSatProof++;
+        return 1;
+    }
+
+    // solve under assumptions
+    // A = 0; B = 1     OR     A = 0; B = 0 
+clk = clock();
+    pLits[0] = toLitCond( Fra_ObjSatNum(pOld), 1 );
+    pLits[1] = toLitCond( Fra_ObjSatNum(pNew), pOld->fPhase ^ pNew->fPhase );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 2, 
+        (sint64)nBTLimit, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        pLits[1] = lit_neg( pLits[1] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        Fra_SmlSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        pOld->fMarkB = 1;
+        pNew->fMarkB = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+/*
+    // check BDD proof
+    {
+        int RetVal;
+        PRT( "Sat", clock() - clk2 );
+        clk2 = clock();
+        RetVal = Fra_NodesAreEquivBdd( pOld, pNew );
+//        printf( "%d ", RetVal );
+        assert( RetVal );
+        PRT( "Bdd", clock() - clk2 );
+        printf( "\n" );
+    }
+*/
+    // return SAT proof
+    p->nSatProof++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Runs the result of test for pObj => pNew.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_NodesAreImp( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew, int fComplL, int fComplR )
+{
+    int pLits[4], RetValue, RetValue1, nBTLimit, clk, clk2 = clock();
+    int status;
+
+    // make sure the nodes are not complemented
+    assert( !Aig_IsComplement(pNew) );
+    assert( !Aig_IsComplement(pOld) );
+    assert( pNew != pOld );
+
+    // if at least one of the nodes is a failed node, perform adjustments:
+    // if the backtrack limit is small, simply skip this node
+    // if the backtrack limit is > 10, take the quare root of the limit
+    nBTLimit = p->pPars->nBTLimitNode;
+/*
+    if ( !p->pPars->fSpeculate && p->pPars->nFramesK == 0 && (nBTLimit > 0 && (pOld->fMarkB || pNew->fMarkB)) )
+    {
+        p->nSatFails++;
+        // fail immediately
+//        return -1;
+        if ( nBTLimit <= 10 )
+            return -1;
+        nBTLimit = (int)pow(nBTLimit, 0.7);
+    }
+*/
+    p->nSatCalls++;
+
+    // make sure the solver is allocated and has enough variables
+    if ( p->pSat == NULL )
+    {
+        p->pSat = sat_solver_new();
+        p->nSatVars = 1;
+        sat_solver_setnvars( p->pSat, 1000 );
+        // var 0 is reserved for const1 node - add the clause
+        pLits[0] = toLit( 0 );
+        sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+    }
+
+    // if the nodes do not have SAT variables, allocate them
+    Fra_CnfNodeAddToSolver( p, pOld, pNew );
+
+    if ( p->pSat->qtail != p->pSat->qhead )
+    {
+        status = sat_solver_simplify(p->pSat);
+        assert( status != 0 );
+        assert( p->pSat->qtail == p->pSat->qhead );
+    }
+
+    // prepare variable activity
+    if ( p->pPars->fConeBias )
+        Fra_SetActivityFactors( p, pOld, pNew ); 
+
+    // solve under assumptions
+    // A = 1; B = 0     OR     A = 1; B = 1 
+clk = clock();
+//    pLits[0] = toLitCond( Fra_ObjSatNum(pOld), 0 );
+//    pLits[1] = toLitCond( Fra_ObjSatNum(pNew), pOld->fPhase == pNew->fPhase );
+    pLits[0] = toLitCond( Fra_ObjSatNum(pOld),  fComplL );
+    pLits[1] = toLitCond( Fra_ObjSatNum(pNew), !fComplR );
+//Sat_SolverWriteDimacs( p->pSat, "temp.cnf", pLits, pLits + 2, 1 );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 2, 
+        (sint64)nBTLimit, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        pLits[1] = lit_neg( pLits[1] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+        // continue solving the other implication
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        Fra_SmlSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        if ( pOld != p->pManFraig->pConst1 ) 
+            pOld->fMarkB = 1;
+        pNew->fMarkB = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+    // return SAT proof
+    p->nSatProof++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Runs equivalence test for one node.]
+
+  Description [Returns the fraiged node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_NodeIsConst( Fra_Man_t * p, Aig_Obj_t * pNew )
+{
+    int pLits[2], RetValue1, RetValue, clk;
+
+    // make sure the nodes are not complemented
+    assert( !Aig_IsComplement(pNew) );
+    assert( pNew != p->pManFraig->pConst1 );
+    p->nSatCalls++;
+
+    // make sure the solver is allocated and has enough variables
+    if ( p->pSat == NULL )
+    {
+        p->pSat = sat_solver_new();
+        p->nSatVars = 1;
+        sat_solver_setnvars( p->pSat, 1000 );
+        // var 0 is reserved for const1 node - add the clause
+        pLits[0] = toLit( 0 );
+        sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+    }
+
+    // if the nodes do not have SAT variables, allocate them
+    Fra_CnfNodeAddToSolver( p, NULL, pNew );
+
+    // prepare variable activity
+    if ( p->pPars->fConeBias )
+        Fra_SetActivityFactors( p, NULL, pNew ); 
+
+    // solve under assumptions
+clk = clock();
+    pLits[0] = toLitCond( Fra_ObjSatNum(pNew), pNew->fPhase );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 1, 
+        (sint64)p->pPars->nBTLimitMiter, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+        assert( RetValue );
+        // continue solving the other implication
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        if ( p->pPatWords )
+            Fra_SmlSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        pNew->fMarkB = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+
+    // return SAT proof
+    p->nSatProof++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets variable activities in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SetActivityFactors_rec( Fra_Man_t * p, Aig_Obj_t * pObj, int LevelMin, int LevelMax )
+{
+    Vec_Ptr_t * vFanins;
+    Aig_Obj_t * pFanin;
+    int i, Counter = 0;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Fra_ObjSatNum(pObj) );
+    // skip visited variables
+    if ( Aig_ObjIsTravIdCurrent(p->pManFraig, pObj) )
+        return 0;
+    Aig_ObjSetTravIdCurrent(p->pManFraig, pObj);
+    // add the PI to the list
+    if ( pObj->Level <= (unsigned)LevelMin || Aig_ObjIsPi(pObj) )
+        return 0;
+    // set the factor of this variable
+    // (LevelMax-LevelMin) / (pObj->Level-LevelMin) = p->pPars->dActConeBumpMax / ThisBump
+    p->pSat->factors[Fra_ObjSatNum(pObj)] = p->pPars->dActConeBumpMax * (pObj->Level - LevelMin)/(LevelMax - LevelMin);
+    veci_push(&p->pSat->act_vars, Fra_ObjSatNum(pObj));
+    // explore the fanins
+    vFanins = Fra_ObjFaninVec( pObj );
+    Vec_PtrForEachEntry( vFanins, pFanin, i )
+        Counter += Fra_SetActivityFactors_rec( p, Aig_Regular(pFanin), LevelMin, LevelMax );
+    return 1 + Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets variable activities in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SetActivityFactors( Fra_Man_t * p, Aig_Obj_t * pOld, Aig_Obj_t * pNew )
+{
+    int clk, LevelMin, LevelMax;
+    assert( pOld || pNew );
+clk = clock(); 
+    // reset the active variables
+    veci_resize(&p->pSat->act_vars, 0);
+    // prepare for traversal
+    Aig_ManIncrementTravId( p->pManFraig );
+    // determine the min and max level to visit
+    assert( p->pPars->dActConeRatio > 0 && p->pPars->dActConeRatio < 1 );
+    LevelMax = AIG_MAX( (pNew ? pNew->Level : 0), (pOld ? pOld->Level : 0) );
+    LevelMin = (int)(LevelMax * (1.0 - p->pPars->dActConeRatio));
+    // traverse
+    if ( pOld && !Aig_ObjIsConst1(pOld) )
+        Fra_SetActivityFactors_rec( p, pOld, LevelMin, LevelMax );
+    if ( pNew && !Aig_ObjIsConst1(pNew) )
+        Fra_SetActivityFactors_rec( p, pNew, LevelMin, LevelMax );
+//Fra_PrintActivity( p );
+p->timeTrav += clock() - clk;
+    return 1;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraSec.c b/abc70930/src/aig/fra/fraSec.c
new file mode 100644
index 00000000..eaa97709
--- /dev/null
+++ b/abc70930/src/aig/fra/fraSec.c
@@ -0,0 +1,283 @@
+/**CFile****************************************************************
+
+  FileName    [fraSec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    [Performs SEC based on seq sweeping.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraSec.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+#include "ioa.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_FraigSec2( Aig_Man_t * p, int nFramesFix, int fVerbose, int fVeryVerbose )
+{
+    Aig_Man_t * pNew;
+    int nFrames, RetValue, nIter, clk, clkTotal = clock();
+    int fLatchCorr = 0;
+    if ( nFramesFix )
+    {
+        nFrames = nFramesFix;
+        // perform seq sweeping for one frame number
+        pNew = Fra_FraigInduction( p, 0, nFrames, 0, 0, 0, fLatchCorr, 0, fVeryVerbose, &nIter );
+    }
+    else
+    {
+        // perform seq sweeping while increasing the number of frames
+        for ( nFrames = 1; ; nFrames++ )
+        {
+clk = clock();
+            pNew = Fra_FraigInduction( p, 0, nFrames, 0, 0, 0, fLatchCorr, 0, fVeryVerbose, &nIter );
+            RetValue = Fra_FraigMiterStatus( pNew );
+            if ( fVerbose )
+            {
+                printf( "FRAMES %3d : Iters = %3d. ", nFrames, nIter );
+                if ( RetValue == 1 )
+                    printf( "UNSAT     " );
+                else
+                    printf( "UNDECIDED " );
+PRT( "Time", clock() - clk );
+            }
+            if ( RetValue != -1 )
+                break;
+            Aig_ManStop( pNew );
+        }
+    }
+
+    // get the miter status
+    RetValue = Fra_FraigMiterStatus( pNew );
+    Aig_ManStop( pNew );
+
+    // report the miter
+    if ( RetValue == 1 )
+        printf( "Networks are equivalent after seq sweeping with K=%d frames (%d iters). ", nFrames, nIter );
+    else if ( RetValue == 0 )
+        printf( "Networks are NOT EQUIVALENT. " );
+    else
+        printf( "Networks are UNDECIDED after seq sweeping with K=%d frames (%d iters). ", nFrames, nIter );
+PRT( "Time", clock() - clkTotal );
+    return RetValue;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_FraigSec( Aig_Man_t * p, int nFramesMax, int fRetimeFirst, int fVerbose, int fVeryVerbose )
+{
+    Fra_Sml_t * pSml;
+    Aig_Man_t * pNew, * pTemp;
+    int nFrames, RetValue, nIter, clk, clkTotal = clock();
+    int fLatchCorr = 0;
+
+    pNew = Aig_ManDup( p, 1 );
+    if ( fVerbose )
+    {
+        printf( "Original miter:       Latches = %5d. Nodes = %6d.\n", 
+            Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+    }
+//Aig_ManDumpBlif( pNew, "after.blif" );
+
+    // perform sequential cleanup
+clk = clock();
+    if ( pNew->nRegs )
+    pNew = Aig_ManReduceLaches( pNew, 0 );
+    if ( pNew->nRegs )
+    pNew = Aig_ManConstReduce( pNew, 0 );
+    if ( fVerbose )
+    {
+        printf( "Sequential cleanup:   Latches = %5d. Nodes = %6d. ", 
+            Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+    }
+
+    // perform forward retiming
+    if ( fRetimeFirst && pNew->nRegs )
+    {
+clk = clock();
+    pNew = Rtm_ManRetime( pTemp = pNew, 1, 1000, 0 );
+    Aig_ManStop( pTemp );
+    if ( fVerbose )
+    {
+        printf( "Forward retiming:     Latches = %5d. Nodes = %6d. ", 
+            Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+    }
+    }
+    
+    // run latch correspondence
+clk = clock();
+    if ( pNew->nRegs )
+    {
+    pNew = Aig_ManDup( pTemp = pNew, 1 );
+    Aig_ManStop( pTemp );
+    pNew = Fra_FraigLatchCorrespondence( pTemp = pNew, 0, 100000, 1, fVeryVerbose, &nIter );
+    Aig_ManStop( pTemp );
+    if ( pNew == NULL )
+    {
+        RetValue = 0;
+        printf( "Networks are NOT EQUIVALENT after simulation.   " );
+PRT( "Time", clock() - clkTotal );
+        return RetValue;
+    }
+
+    if ( fVerbose )
+    {
+        printf( "Latch-corr (I=%3d):   Latches = %5d. Nodes = %6d. ", 
+            nIter, Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+    }
+    }
+
+    // perform fraiging
+clk = clock();
+    pNew = Fra_FraigEquivence( pTemp = pNew, 100 );
+    Aig_ManStop( pTemp );
+    if ( fVerbose )
+    {
+        printf( "Fraiging:             Latches = %5d. Nodes = %6d. ", 
+            Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+    }
+
+    // perform seq sweeping while increasing the number of frames
+    RetValue = Fra_FraigMiterStatus( pNew );
+    if ( RetValue == -1 )
+    for ( nFrames = 1; nFrames <= nFramesMax; nFrames *= 2 )
+    {
+clk = clock();
+        pNew = Fra_FraigInduction( pTemp = pNew, 0, nFrames, 0, 0, 0, fLatchCorr, 0, fVeryVerbose, &nIter );
+        Aig_ManStop( pTemp );
+        RetValue = Fra_FraigMiterStatus( pNew );
+        if ( fVerbose )
+        { 
+            printf( "K-step (K=%2d,I=%3d):  Latches = %5d. Nodes = %6d. ", 
+                nFrames, nIter, Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+        }
+        if ( RetValue != -1 )
+            break;
+
+        // perform rewriting
+clk = clock();
+        pNew = Aig_ManDup( pTemp = pNew, 1 );
+        Aig_ManStop( pTemp );
+        pNew = Dar_ManRewriteDefault( pNew );
+        if ( fVerbose )
+        {
+            printf( "Rewriting:            Latches = %5d. Nodes = %6d. ", 
+                Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+        } 
+
+        // perform retiming
+        if ( pNew->nRegs )
+        {
+clk = clock();
+        pNew = Rtm_ManRetime( pTemp = pNew, 1, 1000, 0 );
+        Aig_ManStop( pTemp );
+        pNew = Aig_ManDup( pTemp = pNew, 1 );
+        Aig_ManStop( pTemp );
+        if ( fVerbose )
+        {
+            printf( "Forward retiming:     Latches = %5d. Nodes = %6d. ", 
+                Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+        }
+        }
+
+        if ( pNew->nRegs )
+        pNew = Aig_ManConstReduce( pNew, 0 );
+
+        // perform sequential simulation
+clk = clock();
+        pSml = Fra_SmlSimulateSeq( pNew, 0, 128 * nFrames, 1 + 16/(1+Aig_ManNodeNum(pNew)/1000) ); 
+        if ( fVerbose )
+        {
+            printf( "Seq simulation  :     Latches = %5d. Nodes = %6d. ", 
+                Aig_ManRegNum(pNew), Aig_ManNodeNum(pNew) );
+PRT( "Time", clock() - clk );
+        }
+        if ( pSml->fNonConstOut )
+        {
+            Fra_SmlStop( pSml );
+            Aig_ManStop( pNew );
+            RetValue = 0;
+            printf( "Networks are NOT EQUIVALENT after simulation.   " );
+PRT( "Time", clock() - clkTotal );
+            return RetValue;
+        }
+        Fra_SmlStop( pSml );
+    }
+
+    // get the miter status
+    RetValue = Fra_FraigMiterStatus( pNew );
+
+    // report the miter
+    if ( RetValue == 1 )
+    {
+        printf( "Networks are equivalent.   " );
+PRT( "Time", clock() - clkTotal );
+    }
+    else if ( RetValue == 0 )
+    {
+        printf( "Networks are NOT EQUIVALENT.   " );
+PRT( "Time", clock() - clkTotal );
+    }
+    else
+    {
+        static int Counter = 1;
+        char pFileName[1000];
+        printf( "Networks are UNDECIDED.   " );
+PRT( "Time", clock() - clkTotal );
+        sprintf( pFileName, "sm%03d.aig", Counter++ );
+        Ioa_WriteAiger( pNew, pFileName, 0 );
+        printf( "The unsolved reduced miter is written into file \"%s\".\n", pFileName );
+    }
+    Aig_ManStop( pNew );
+    return RetValue;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fraSim.c b/abc70930/src/aig/fra/fraSim.c
new file mode 100644
index 00000000..b77c775a
--- /dev/null
+++ b/abc70930/src/aig/fra/fraSim.c
@@ -0,0 +1,823 @@
+/**CFile****************************************************************
+
+  FileName    [fraSim.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fraSim.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes hash value of the node using its simulation info.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlNodeHash( Aig_Obj_t * pObj, int nTableSize )
+{
+    Fra_Man_t * p = pObj->pData;
+    static int s_FPrimes[128] = { 
+        1009, 1049, 1093, 1151, 1201, 1249, 1297, 1361, 1427, 1459, 
+        1499, 1559, 1607, 1657, 1709, 1759, 1823, 1877, 1933, 1997, 
+        2039, 2089, 2141, 2213, 2269, 2311, 2371, 2411, 2467, 2543, 
+        2609, 2663, 2699, 2741, 2797, 2851, 2909, 2969, 3037, 3089, 
+        3169, 3221, 3299, 3331, 3389, 3461, 3517, 3557, 3613, 3671, 
+        3719, 3779, 3847, 3907, 3943, 4013, 4073, 4129, 4201, 4243, 
+        4289, 4363, 4441, 4493, 4549, 4621, 4663, 4729, 4793, 4871, 
+        4933, 4973, 5021, 5087, 5153, 5227, 5281, 5351, 5417, 5471, 
+        5519, 5573, 5651, 5693, 5749, 5821, 5861, 5923, 6011, 6073, 
+        6131, 6199, 6257, 6301, 6353, 6397, 6481, 6563, 6619, 6689, 
+        6737, 6803, 6863, 6917, 6977, 7027, 7109, 7187, 7237, 7309, 
+        7393, 7477, 7523, 7561, 7607, 7681, 7727, 7817, 7877, 7933, 
+        8011, 8039, 8059, 8081, 8093, 8111, 8123, 8147
+    };
+    unsigned * pSims;
+    unsigned uHash;
+    int i;
+//    assert( p->pSml->nWordsTotal <= 128 );
+    uHash = 0;
+    pSims = Fra_ObjSim(p->pSml, pObj->Id);
+    for ( i = p->pSml->nWordsPref; i < p->pSml->nWordsTotal; i++ )
+        uHash ^= pSims[i] * s_FPrimes[i & 0x7F];
+    return uHash % nTableSize;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation info is composed of all zeros.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlNodeIsConst( Aig_Obj_t * pObj )
+{
+    Fra_Man_t * p = pObj->pData;
+    unsigned * pSims;
+    int i;
+    pSims = Fra_ObjSim(p->pSml, pObj->Id);
+    for ( i = p->pSml->nWordsPref; i < p->pSml->nWordsTotal; i++ )
+        if ( pSims[i] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation infos are equal.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 )
+{
+    Fra_Man_t * p = pObj0->pData;
+    unsigned * pSims0, * pSims1;
+    int i;
+    pSims0 = Fra_ObjSim(p->pSml, pObj0->Id);
+    pSims1 = Fra_ObjSim(p->pSml, pObj1->Id);
+    for ( i = p->pSml->nWordsPref; i < p->pSml->nWordsTotal; i++ )
+        if ( pSims0[i] != pSims1[i] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1s in the XOR of simulation data.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlNodeNotEquWeight( Fra_Sml_t * p, int Left, int Right )
+{
+    unsigned * pSimL, * pSimR;
+    int k, Counter = 0;
+    pSimL = Fra_ObjSim( p, Left );
+    pSimR = Fra_ObjSim( p, Right );
+    for ( k = p->nWordsPref; k < p->nWordsTotal; k++ )
+        Counter += Aig_WordCountOnes( pSimL[k] ^ pSimR[k] );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation info is composed of all zeros.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlNodeIsZero( Fra_Sml_t * p, Aig_Obj_t * pObj )
+{
+    unsigned * pSims;
+    int i;
+    pSims = Fra_ObjSim(p, pObj->Id);
+    for ( i = p->nWordsPref; i < p->nWordsTotal; i++ )
+        if ( pSims[i] )
+            return 0;
+    return 1;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Generated const 0 pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlSavePattern0( Fra_Man_t * p, int fInit )
+{
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [[Generated const 1 pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlSavePattern1( Fra_Man_t * p, int fInit )
+{
+    Aig_Obj_t * pObj;
+    int i, k, nTruePis;
+    memset( p->pPatWords, 0xff, sizeof(unsigned) * p->nPatWords );
+    if ( !fInit )
+        return;
+    // clear the state bits to correspond to all-0 initial state
+    nTruePis = Aig_ManPiNum(p->pManAig) - Aig_ManRegNum(p->pManAig);
+    k = 0;
+    Aig_ManForEachLoSeq( p->pManAig, pObj, i )
+        Aig_InfoXorBit( p->pPatWords, nTruePis * p->nFramesAll + k++ );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Copy pattern from the solver into the internal storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlSavePattern( Fra_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+    Aig_ManForEachPi( p->pManFraig, pObj, i )
+        if ( p->pSat->model.ptr[Fra_ObjSatNum(pObj)] == l_True )
+            Aig_InfoSetBit( p->pPatWords, i );
+
+    if ( p->vCex )
+    {
+        Vec_IntClear( p->vCex );
+        for ( i = 0; i < Aig_ManPiNum(p->pManAig) - Aig_ManRegNum(p->pManAig); i++ )
+            Vec_IntPush( p->vCex, Aig_InfoHasBit( p->pPatWords, i ) );
+        for ( i = Aig_ManPiNum(p->pManFraig) - Aig_ManRegNum(p->pManFraig); i < Aig_ManPiNum(p->pManFraig); i++ )
+            Vec_IntPush( p->vCex, Aig_InfoHasBit( p->pPatWords, i ) );
+    }
+
+/*
+    printf( "Pattern: " );
+    Aig_ManForEachPi( p->pManFraig, pObj, i )
+        printf( "%d", Aig_InfoHasBit( p->pPatWords, i ) );
+    printf( "\n" );
+*/
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the counter-example from the successful pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlCheckOutputSavePattern( Fra_Man_t * p, Aig_Obj_t * pObj )
+{ 
+    unsigned * pSims;
+    int i, k, BestPat, * pModel;
+    // find the word of the pattern
+    pSims = Fra_ObjSim(p->pSml, pObj->Id);
+    for ( i = 0; i < p->pSml->nWordsTotal; i++ )
+        if ( pSims[i] )
+            break;
+    assert( i < p->pSml->nWordsTotal );
+    // find the bit of the pattern
+    for ( k = 0; k < 32; k++ )
+        if ( pSims[i] & (1 << k) )
+            break;
+    assert( k < 32 );
+    // determine the best pattern
+    BestPat = i * 32 + k;
+    // fill in the counter-example data
+    pModel = ALLOC( int, Aig_ManPiNum(p->pManFraig) );
+    Aig_ManForEachPi( p->pManAig, pObj, i )
+    {
+        pModel[i] = Aig_InfoHasBit(Fra_ObjSim(p->pSml, pObj->Id), BestPat);
+//        printf( "%d", pModel[i] );
+    }
+//    printf( "\n" );
+    // set the model
+    assert( p->pManFraig->pData == NULL );
+    p->pManFraig->pData = pModel;
+    return;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the one of the output is already non-constant 0.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlCheckOutput( Fra_Man_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    // make sure the reference simulation pattern does not detect the bug
+    pObj = Aig_ManPo( p->pManAig, 0 );
+    assert( Aig_ObjFanin0(pObj)->fPhase == (unsigned)Aig_ObjFaninC0(pObj) ); 
+    Aig_ManForEachPo( p->pManAig, pObj, i )
+    {
+        if ( !Fra_SmlNodeIsConst( Aig_ObjFanin0(pObj) ) )
+        {
+            // create the counter-example from this pattern
+            Fra_SmlCheckOutputSavePattern( p, Aig_ObjFanin0(pObj) );
+            return 1;
+        }
+    }
+    return 0;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Assigns random patterns to the PI node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlAssignRandom( Fra_Sml_t * p, Aig_Obj_t * pObj )
+{
+    unsigned * pSims;
+    int i;
+    assert( Aig_ObjIsPi(pObj) );
+    pSims = Fra_ObjSim( p, pObj->Id );
+    for ( i = 0; i < p->nWordsTotal; i++ )
+        pSims[i] = Fra_ObjRandomSim();
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assigns constant patterns to the PI node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlAssignConst( Fra_Sml_t * p, Aig_Obj_t * pObj, int fConst1, int iFrame )
+{
+    unsigned * pSims;
+    int i;
+    assert( Aig_ObjIsPi(pObj) );
+    pSims = Fra_ObjSim( p, pObj->Id ) + p->nWordsFrame * iFrame;
+    for ( i = 0; i < p->nWordsFrame; i++ )
+        pSims[i] = fConst1? ~(unsigned)0 : 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assings random simulation info for the PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlInitialize( Fra_Sml_t * p, int fInit )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    if ( fInit )
+    {
+        assert( Aig_ManRegNum(p->pAig) > 0 );
+        assert( Aig_ManRegNum(p->pAig) < Aig_ManPiNum(p->pAig) );
+        // assign random info for primary inputs
+        Aig_ManForEachPiSeq( p->pAig, pObj, i )
+            Fra_SmlAssignRandom( p, pObj );
+        // assign the initial state for the latches
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Fra_SmlAssignConst( p, pObj, 0, 0 );
+    }
+    else
+    {
+        Aig_ManForEachPi( p->pAig, pObj, i )
+            Fra_SmlAssignRandom( p, pObj );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assings distance-1 simulation info for the PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlAssignDist1( Fra_Sml_t * p, unsigned * pPat )
+{
+    Aig_Obj_t * pObj;
+    int f, i, k, Limit, nTruePis;
+    assert( p->nFrames > 0 );
+    if ( p->nFrames == 1 )
+    {
+        // copy the PI info 
+        Aig_ManForEachPi( p->pAig, pObj, i )
+            Fra_SmlAssignConst( p, pObj, Aig_InfoHasBit(pPat, i), 0 );
+        // flip one bit
+        Limit = AIG_MIN( Aig_ManPiNum(p->pAig), p->nWordsTotal * 32 - 1 );
+        for ( i = 0; i < Limit; i++ )
+            Aig_InfoXorBit( Fra_ObjSim( p, Aig_ManPi(p->pAig,i)->Id ), i+1 );
+    }
+    else
+    {
+        int fUseDist1 = 0;
+
+        // copy the PI info for each frame
+        nTruePis = Aig_ManPiNum(p->pAig) - Aig_ManRegNum(p->pAig);
+        for ( f = 0; f < p->nFrames; f++ )
+            Aig_ManForEachPiSeq( p->pAig, pObj, i )
+                Fra_SmlAssignConst( p, pObj, Aig_InfoHasBit(pPat, nTruePis * f + i), f );
+        // copy the latch info 
+        k = 0;
+        Aig_ManForEachLoSeq( p->pAig, pObj, i )
+            Fra_SmlAssignConst( p, pObj, Aig_InfoHasBit(pPat, nTruePis * p->nFrames + k++), 0 );
+//        assert( p->pManFraig == NULL || nTruePis * p->nFrames + k == Aig_ManPiNum(p->pManFraig) );
+
+        // flip one bit of the last frame
+        if ( fUseDist1 ) //&& p->nFrames == 2 )
+        {
+            Limit = AIG_MIN( nTruePis, p->nWordsFrame * 32 - 1 );
+            for ( i = 0; i < Limit; i++ )
+                Aig_InfoXorBit( Fra_ObjSim( p, Aig_ManPi(p->pAig, i)->Id ) + p->nWordsFrame*(p->nFrames-1), i+1 );
+        }
+    }
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlNodeSimulate( Fra_Sml_t * p, Aig_Obj_t * pObj, int iFrame )
+{
+    unsigned * pSims, * pSims0, * pSims1;
+    int fCompl, fCompl0, fCompl1, i;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsNode(pObj) );
+    assert( iFrame == 0 || p->nWordsFrame < p->nWordsTotal );
+    // get hold of the simulation information
+    pSims  = Fra_ObjSim(p, pObj->Id) + p->nWordsFrame * iFrame;
+    pSims0 = Fra_ObjSim(p, Aig_ObjFanin0(pObj)->Id) + p->nWordsFrame * iFrame;
+    pSims1 = Fra_ObjSim(p, Aig_ObjFanin1(pObj)->Id) + p->nWordsFrame * iFrame;
+    // get complemented attributes of the children using their random info
+    fCompl  = pObj->fPhase;
+    fCompl0 = Aig_ObjPhaseReal(Aig_ObjChild0(pObj));
+    fCompl1 = Aig_ObjPhaseReal(Aig_ObjChild1(pObj));
+    // simulate
+    if ( fCompl0 && fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (pSims0[i] | pSims1[i]);
+        else
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = ~(pSims0[i] | pSims1[i]);
+    }
+    else if ( fCompl0 && !fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (pSims0[i] | ~pSims1[i]);
+        else
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (~pSims0[i] & pSims1[i]);
+    }
+    else if ( !fCompl0 && fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (~pSims0[i] | pSims1[i]);
+        else
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (pSims0[i] & ~pSims1[i]);
+    }
+    else // if ( !fCompl0 && !fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = ~(pSims0[i] & pSims1[i]);
+        else
+            for ( i = 0; i < p->nWordsFrame; i++ )
+                pSims[i] = (pSims0[i] & pSims1[i]);
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlNodeCopyFanin( Fra_Sml_t * p, Aig_Obj_t * pObj, int iFrame )
+{
+    unsigned * pSims, * pSims0;
+    int fCompl, fCompl0, i;
+    assert( !Aig_IsComplement(pObj) );
+    assert( Aig_ObjIsPo(pObj) );
+    assert( iFrame == 0 || p->nWordsFrame < p->nWordsTotal );
+    // get hold of the simulation information
+    pSims  = Fra_ObjSim(p, pObj->Id) + p->nWordsFrame * iFrame;
+    pSims0 = Fra_ObjSim(p, Aig_ObjFanin0(pObj)->Id) + p->nWordsFrame * iFrame;
+    // get complemented attributes of the children using their random info
+    fCompl  = pObj->fPhase;
+    fCompl0 = Aig_ObjPhaseReal(Aig_ObjChild0(pObj));
+    // copy information as it is
+    if ( fCompl0 )
+        for ( i = 0; i < p->nWordsFrame; i++ )
+            pSims[i] = ~pSims0[i];
+    else
+        for ( i = 0; i < p->nWordsFrame; i++ )
+            pSims[i] = pSims0[i];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlNodeTransferNext( Fra_Sml_t * p, Aig_Obj_t * pOut, Aig_Obj_t * pIn, int iFrame )
+{
+    unsigned * pSims0, * pSims1;
+    int i;
+    assert( !Aig_IsComplement(pOut) );
+    assert( !Aig_IsComplement(pIn) );
+    assert( Aig_ObjIsPo(pOut) );
+    assert( Aig_ObjIsPi(pIn) );
+    assert( iFrame == 0 || p->nWordsFrame < p->nWordsTotal );
+    // get hold of the simulation information
+    pSims0 = Fra_ObjSim(p, pOut->Id) + p->nWordsFrame * iFrame;
+    pSims1 = Fra_ObjSim(p, pIn->Id) + p->nWordsFrame * (iFrame+1);
+    // copy information as it is
+    for ( i = 0; i < p->nWordsFrame; i++ )
+        pSims1[i] = pSims0[i];
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Check if any of the POs becomes non-constant.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fra_SmlCheckNonConstOutputs( Fra_Sml_t * p )
+{
+    Aig_Obj_t * pObj;
+    int i;
+    Aig_ManForEachPoSeq( p->pAig, pObj, i )
+        if ( !Fra_SmlNodeIsZero(p, pObj) )
+            return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates AIG manager.]
+
+  Description [Assumes that the PI simulation info is attached.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlSimulateOne( Fra_Sml_t * p )
+{
+    Aig_Obj_t * pObj, * pObjLi, * pObjLo;
+    int f, i, clk;
+clk = clock();
+    for ( f = 0; f < p->nFrames; f++ )
+    {
+        // simulate the nodes
+        Aig_ManForEachNode( p->pAig, pObj, i )
+            Fra_SmlNodeSimulate( p, pObj, f );
+        // copy simulation info into outputs
+        Aig_ManForEachPoSeq( p->pAig, pObj, i )
+            Fra_SmlNodeCopyFanin( p, pObj, f );
+        // quit if this is the last timeframe
+        if ( f == p->nFrames - 1 )
+            break;
+        // copy simulation info into outputs
+        Aig_ManForEachLiSeq( p->pAig, pObj, i )
+            Fra_SmlNodeCopyFanin( p, pObj, f );
+        // copy simulation info into the inputs
+        Aig_ManForEachLiLoSeq( p->pAig, pObjLi, pObjLo, i )
+            Fra_SmlNodeTransferNext( p, pObjLi, pObjLo, f );
+    }
+p->timeSim += clock() - clk;
+p->nSimRounds++;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Resimulates fraiging manager after finding a counter-example.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlResimulate( Fra_Man_t * p )
+{
+    int nChanges, clk;
+    Fra_SmlAssignDist1( p->pSml, p->pPatWords );
+    Fra_SmlSimulateOne( p->pSml );
+//    if ( p->pPars->fPatScores )
+//        Fra_CleanPatScores( p );
+    if ( p->pPars->fProve && Fra_SmlCheckOutput(p) )
+        return;
+clk = clock();
+    nChanges = Fra_ClassesRefine( p->pCla );
+    nChanges += Fra_ClassesRefine1( p->pCla, 1, NULL );
+    if ( p->pCla->vImps )
+        nChanges += Fra_ImpRefineUsingCex( p, p->pCla->vImps );
+p->timeRef += clock() - clk;
+    if ( !p->pPars->nFramesK && nChanges < 1 )
+        printf( "Error: A counter-example did not refine classes!\n" );
+//    assert( nChanges >= 1 );
+//printf( "Refined classes = %5d.   Changes = %4d.\n", Vec_PtrSize(p->vClasses), nChanges );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs simulation of the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlSimulate( Fra_Man_t * p, int fInit )
+{
+    int fVerbose = 0;
+    int nChanges, nClasses, clk;
+    assert( !fInit || Aig_ManRegNum(p->pManAig) );
+    // start the classes
+    Fra_SmlInitialize( p->pSml, fInit );
+    Fra_SmlSimulateOne( p->pSml );
+    Fra_ClassesPrepare( p->pCla, p->pPars->fLatchCorr );
+//    Fra_ClassesPrint( p->pCla, 0 );
+if ( fVerbose )
+printf( "Starting classes = %5d.   Lits = %6d.\n", Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
+
+//return;
+
+    // refine classes by walking 0/1 patterns
+    Fra_SmlSavePattern0( p, fInit );
+    Fra_SmlAssignDist1( p->pSml, p->pPatWords );
+    Fra_SmlSimulateOne( p->pSml );
+    if ( p->pPars->fProve && Fra_SmlCheckOutput(p) )
+        return;
+clk = clock();
+    nChanges = Fra_ClassesRefine( p->pCla );
+    nChanges += Fra_ClassesRefine1( p->pCla, 1, NULL );
+p->timeRef += clock() - clk;
+if ( fVerbose )
+printf( "Refined classes  = %5d.   Changes = %4d.   Lits = %6d.\n", Vec_PtrSize(p->pCla->vClasses), nChanges, Fra_ClassesCountLits(p->pCla) );
+    Fra_SmlSavePattern1( p, fInit );
+    Fra_SmlAssignDist1( p->pSml, p->pPatWords );
+    Fra_SmlSimulateOne( p->pSml );
+    if ( p->pPars->fProve && Fra_SmlCheckOutput(p) )
+        return;
+clk = clock();
+    nChanges = Fra_ClassesRefine( p->pCla );
+    nChanges += Fra_ClassesRefine1( p->pCla, 1, NULL );
+p->timeRef += clock() - clk;
+
+if ( fVerbose )
+printf( "Refined classes  = %5d.   Changes = %4d.   Lits = %6d.\n", Vec_PtrSize(p->pCla->vClasses), nChanges, Fra_ClassesCountLits(p->pCla) );
+    // refine classes by random simulation
+    do {
+        Fra_SmlInitialize( p->pSml, fInit );
+        Fra_SmlSimulateOne( p->pSml );
+        nClasses = Vec_PtrSize(p->pCla->vClasses);
+        if ( p->pPars->fProve && Fra_SmlCheckOutput(p) )
+            return;
+clk = clock();
+        nChanges = Fra_ClassesRefine( p->pCla );
+        nChanges += Fra_ClassesRefine1( p->pCla, 1, NULL );
+p->timeRef += clock() - clk;
+if ( fVerbose )
+printf( "Refined classes  = %5d.   Changes = %4d.   Lits = %6d.\n", Vec_PtrSize(p->pCla->vClasses), nChanges, Fra_ClassesCountLits(p->pCla) );
+    } while ( (double)nChanges / nClasses > p->pPars->dSimSatur );
+
+//    if ( p->pPars->fVerbose )
+//    printf( "Consts = %6d. Classes = %6d. Literals = %6d.\n", 
+//        Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
+//    Fra_ClassesPrint( p->pCla, 0 );
+}
+ 
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates simulation manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Sml_t * Fra_SmlStart( Aig_Man_t * pAig, int nPref, int nFrames, int nWordsFrame )
+{
+    Fra_Sml_t * p;
+    p = (Fra_Sml_t *)malloc( sizeof(Fra_Sml_t) + sizeof(unsigned) * Aig_ManObjNumMax(pAig) * (nPref + nFrames) * nWordsFrame );
+    memset( p, 0, sizeof(Fra_Sml_t) + sizeof(unsigned) * (nPref + nFrames) * nWordsFrame );
+    p->pAig        = pAig;
+    p->nPref       = nPref;
+    p->nFrames     = nPref + nFrames;
+    p->nWordsFrame = nWordsFrame;
+    p->nWordsTotal = (nPref + nFrames) * nWordsFrame;
+    p->nWordsPref  = nPref * nWordsFrame;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates simulation manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Fra_SmlStop( Fra_Sml_t * p )
+{
+    free( p );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Performs simulation of the uninitialized circuit.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Sml_t * Fra_SmlSimulateComb( Aig_Man_t * pAig, int nWords )
+{
+    Fra_Sml_t * p;
+    p = Fra_SmlStart( pAig, 0, 1, nWords );
+    Fra_SmlInitialize( p, 0 );
+    Fra_SmlSimulateOne( p );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs simulation of the initialized circuit.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Fra_Sml_t * Fra_SmlSimulateSeq( Aig_Man_t * pAig, int nPref, int nFrames, int nWords )
+{
+    Fra_Sml_t * p;
+    p = Fra_SmlStart( pAig, nPref, nFrames, nWords );
+    Fra_SmlInitialize( p, 1 );
+    Fra_SmlSimulateOne( p );
+    p->fNonConstOut = Fra_SmlCheckNonConstOutputs( p );
+    return p;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/fra_.c b/abc70930/src/aig/fra/fra_.c
new file mode 100644
index 00000000..2b601587
--- /dev/null
+++ b/abc70930/src/aig/fra/fra_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [fra_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [New FRAIG package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 30, 2007.]
+
+  Revision    [$Id: fra_.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "fra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/fra/module.make b/abc70930/src/aig/fra/module.make
new file mode 100644
index 00000000..e7264fdc
--- /dev/null
+++ b/abc70930/src/aig/fra/module.make
@@ -0,0 +1,12 @@
+SRC +=    src/aig/fra/fraBmc.c \
+    src/aig/fra/fraCec.c \
+    src/aig/fra/fraClass.c \
+    src/aig/fra/fraCnf.c \
+    src/aig/fra/fraCore.c \
+    src/aig/fra/fraImp.c \
+    src/aig/fra/fraInd.c \
+    src/aig/fra/fraLcr.c \
+    src/aig/fra/fraMan.c \
+    src/aig/fra/fraSat.c \
+    src/aig/fra/fraSec.c \
+    src/aig/fra/fraSim.c
diff --git a/abc70930/src/aig/hop/cudd2.c b/abc70930/src/aig/hop/cudd2.c
new file mode 100644
index 00000000..ac912663
--- /dev/null
+++ b/abc70930/src/aig/hop/cudd2.c
@@ -0,0 +1,356 @@
+/**CFile****************************************************************
+
+  FileName    [cudd2.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [Recording AIGs for the BDD operations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - October 3, 2006.]
+
+  Revision    [$Id: cudd2.c,v 1.00 2006/10/03 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+#include "st.h"
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Aig_CuddMan_t_        Aig_CuddMan_t;
+struct Aig_CuddMan_t_
+{
+    Aig_Man_t *  pAig;   // internal AIG package
+    st_table *   pTable; // hash table mapping BDD nodes into AIG nodes
+};
+
+// static Cudd AIG manager used in this experiment
+static Aig_CuddMan_t * s_pCuddMan = NULL;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Start AIG recording.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_Init( unsigned int numVars, unsigned int numVarsZ, unsigned int numSlots, unsigned int cacheSize, unsigned long maxMemory, void * pCudd )
+{
+    int v;
+    // start the BDD-to-AIG manager when the first BDD manager is allocated
+    if ( s_pCuddMan != NULL )
+        return;
+    s_pCuddMan = ALLOC( Aig_CuddMan_t, 1 );
+    s_pCuddMan->pAig = Aig_ManStart();
+    s_pCuddMan->pTable = st_init_table( st_ptrcmp, st_ptrhash );
+    for ( v = 0; v < (int)numVars; v++ )
+        Aig_ObjCreatePi( s_pCuddMan->pAig );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops AIG recording.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_Quit( void * pCudd )
+{
+    assert( s_pCuddMan != NULL );
+    Aig_ManDumpBlif( s_pCuddMan->pAig, "aig_temp.blif" );
+    Aig_ManStop( s_pCuddMan->pAig );
+    st_free_table( s_pCuddMan->pTable );
+    free( s_pCuddMan );
+    s_pCuddMan = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Fetches AIG node corresponding to the BDD node from the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static Aig_Obj_t * Cudd2_GetArg( void * pArg )
+{
+    Aig_Obj_t * pNode;
+    assert( s_pCuddMan != NULL );
+    if ( !st_lookup( s_pCuddMan->pTable, (char *)Aig_Regular(pArg), (char **)&pNode ) )
+    {
+        printf( "Cudd2_GetArg(): An argument BDD is not in the hash table.\n" );
+        return NULL;
+    }
+    return Aig_NotCond( pNode, Aig_IsComplement(pArg) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts the AIG node corresponding to the BDD node into the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static void Cudd2_SetArg( Aig_Obj_t * pNode, void * pResult )
+{
+    assert( s_pCuddMan != NULL );
+    if ( st_is_member( s_pCuddMan->pTable, (char *)Aig_Regular(pResult) ) )
+        return;
+    pNode = Aig_NotCond( pNode,  Aig_IsComplement(pResult) );
+    st_insert( s_pCuddMan->pTable, (char *)Aig_Regular(pResult), (char *)pNode );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Registers constant 1 node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddOne( void * pCudd, void * pResult )
+{
+    Cudd2_SetArg( Aig_ManConst1(s_pCuddMan->pAig), pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddIthVar( void * pCudd, int iVar, void * pResult )
+{
+    int v;
+    assert( s_pCuddMan != NULL );
+    for ( v = Aig_ManPiNum(s_pCuddMan->pAig); v <= iVar; v++ )
+        Aig_ObjCreatePi( s_pCuddMan->pAig );
+    Cudd2_SetArg( Aig_ManPi(s_pCuddMan->pAig, iVar), pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddAnd( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode  = Aig_And( s_pCuddMan->pAig, pNode0, pNode1 );
+    Cudd2_SetArg( pNode, pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddOr( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Cudd2_bddAnd( pCudd, Aig_Not(pArg0), Aig_Not(pArg1), Aig_Not(pResult) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddNand( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Cudd2_bddAnd( pCudd, pArg0, pArg1, Aig_Not(pResult) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddNor( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Cudd2_bddAnd( pCudd, Aig_Not(pArg0), Aig_Not(pArg1), pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddXor( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode  = Aig_Exor( s_pCuddMan->pAig, pNode0, pNode1 );
+    Cudd2_SetArg( pNode, pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddXnor( void * pCudd, void * pArg0, void * pArg1, void * pResult )
+{
+    Cudd2_bddXor( pCudd, pArg0, pArg1, Aig_Not(pResult) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddIte( void * pCudd, void * pArg0, void * pArg1, void * pArg2, void * pResult )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode2, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode2 = Cudd2_GetArg( pArg2 );
+    pNode  = Aig_Mux( s_pCuddMan->pAig, pNode0, pNode1, pNode2 );
+    Cudd2_SetArg( pNode, pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs BDD operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddCompose( void * pCudd, void * pArg0, void * pArg1, int v, void * pResult )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode  = Aig_Compose( s_pCuddMan->pAig, pNode0, pNode1, v );
+    Cudd2_SetArg( pNode, pResult );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Should be called after each containment check.]
+
+  Description [Result should be 1 if Cudd2_bddLeq returned 1.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddLeq( void * pCudd, void * pArg0, void * pArg1, int Result )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode  = Aig_And( s_pCuddMan->pAig, pNode0, Aig_Not(pNode1) );
+    Aig_ObjCreatePo( s_pCuddMan->pAig, pNode );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Should be called after each equality check.]
+
+  Description [Result should be 1 if they are equal.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Cudd2_bddEqual( void * pCudd, void * pArg0, void * pArg1, int Result )
+{
+    Aig_Obj_t * pNode0, * pNode1, * pNode;
+    pNode0 = Cudd2_GetArg( pArg0 );
+    pNode1 = Cudd2_GetArg( pArg1 );
+    pNode  = Aig_Exor( s_pCuddMan->pAig, pNode0, pNode1 );
+    Aig_ObjCreatePo( s_pCuddMan->pAig, pNode );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/cudd2.h b/abc70930/src/aig/hop/cudd2.h
new file mode 100644
index 00000000..69711c11
--- /dev/null
+++ b/abc70930/src/aig/hop/cudd2.h
@@ -0,0 +1,82 @@
+/**CFile****************************************************************
+
+  FileName    [cudd2.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - October 3, 2006.]
+
+  Revision    [$Id: cudd2.h,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __CUDD2_H__
+#define __CUDD2_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+// HA: Added for printing messages
+#ifndef MSG 
+#define MSG(msg) (printf("%s = \n",(msg)));
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+extern void Cudd2_Init      ( unsigned int numVars, unsigned int numVarsZ, unsigned int numSlots, unsigned int cacheSize, unsigned long maxMemory, void * pCudd );
+extern void Cudd2_Quit      ( void * pCudd );
+extern void Cudd2_bddOne    ( void * pCudd, void * pResult );
+extern void Cudd2_bddIthVar ( void * pCudd, int iVar, void * pResult );
+extern void Cudd2_bddAnd    ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddOr     ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddNand   ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddNor    ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddXor    ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddXnor   ( void * pCudd, void * pArg0, void * pArg1, void * pResult );
+extern void Cudd2_bddIte    ( void * pCudd, void * pArg0, void * pArg1, void * pArg2, void * pResult );
+extern void Cudd2_bddCompose( void * pCudd, void * pArg0, void * pArg1, int v, void * pResult );
+extern void Cudd2_bddLeq    ( void * pCudd, void * pArg0, void * pArg1, int Result );
+extern void Cudd2_bddEqual  ( void * pCudd, void * pArg0, void * pArg1, int Result );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/hop/hop.h b/abc70930/src/aig/hop/hop.h
new file mode 100644
index 00000000..e8e916cc
--- /dev/null
+++ b/abc70930/src/aig/hop/hop.h
@@ -0,0 +1,347 @@
+/**CFile****************************************************************
+
+  FileName    [hop.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hop.h,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __HOP_H__
+#define __HOP_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "vec.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Hop_Man_t_            Hop_Man_t;
+typedef struct Hop_Obj_t_            Hop_Obj_t;
+typedef int                          Hop_Edge_t;
+
+// object types
+typedef enum { 
+    AIG_NONE,                        // 0: non-existent object
+    AIG_CONST1,                      // 1: constant 1 
+    AIG_PI,                          // 2: primary input
+    AIG_PO,                          // 3: primary output
+    AIG_AND,                         // 4: AND node
+    AIG_EXOR,                        // 5: EXOR node
+    AIG_VOID                         // 6: unused object
+} Hop_Type_t;
+
+// the AIG node
+struct Hop_Obj_t_  // 6 words
+{
+    void *           pData;          // misc
+    Hop_Obj_t *      pNext;          // strashing table
+    Hop_Obj_t *      pFanin0;        // fanin
+    Hop_Obj_t *      pFanin1;        // fanin
+    unsigned int     Type    :  3;   // object type
+    unsigned int     fPhase  :  1;   // value under 000...0 pattern
+    unsigned int     fMarkA  :  1;   // multipurpose mask
+    unsigned int     fMarkB  :  1;   // multipurpose mask
+    unsigned int     nRefs   : 26;   // reference count (level)
+    int              Id;             // unique ID of the node
+};
+
+// the AIG manager
+struct Hop_Man_t_
+{
+    // AIG nodes
+    Vec_Ptr_t *      vPis;           // the array of PIs
+    Vec_Ptr_t *      vPos;           // the array of POs
+    Vec_Ptr_t *      vObjs;          // the array of all nodes (optional)
+    Hop_Obj_t *      pConst1;        // the constant 1 node
+    Hop_Obj_t        Ghost;          // the ghost node
+    // AIG node counters
+    int              nObjs[AIG_VOID];// the number of objects by type
+    int              nCreated;       // the number of created objects
+    int              nDeleted;       // the number of deleted objects
+    // stuctural hash table
+    Hop_Obj_t **     pTable;         // structural hash table
+    int              nTableSize;     // structural hash table size
+    // various data members
+    void *           pData;          // the temporary data
+    int              nTravIds;       // the current traversal ID
+    int              fRefCount;      // enables reference counting
+    int              fCatchExor;     // enables EXOR nodes
+    // memory management
+    Vec_Ptr_t *      vChunks;        // allocated memory pieces
+    Vec_Ptr_t *      vPages;         // memory pages used by nodes
+    Hop_Obj_t *      pListFree;      // the list of free nodes 
+    // timing statistics
+    int              time1;
+    int              time2;
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+#define AIG_MIN(a,b)       (((a) < (b))? (a) : (b))
+#define AIG_MAX(a,b)       (((a) > (b))? (a) : (b))
+
+#ifndef PRT
+#define PRT(a,t)  printf("%s = ", (a)); printf("%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC))
+#endif
+
+static inline int          Hop_BitWordNum( int nBits )            { return (nBits>>5) + ((nBits&31) > 0);           }
+static inline int          Hop_TruthWordNum( int nVars )          { return nVars <= 5 ? 1 : (1 << (nVars - 5));     }
+static inline int          Hop_InfoHasBit( unsigned * p, int i )  { return (p[(i)>>5] & (1<<((i) & 31))) > 0;       }
+static inline void         Hop_InfoSetBit( unsigned * p, int i )  { p[(i)>>5] |= (1<<((i) & 31));                   }
+static inline void         Hop_InfoXorBit( unsigned * p, int i )  { p[(i)>>5] ^= (1<<((i) & 31));                   }
+static inline int          Hop_Base2Log( unsigned n )             { int r; assert( n >= 0 ); if ( n < 2 ) return n; for ( r = 0, n--; n; n >>= 1, r++ ); return r; }
+static inline int          Hop_Base10Log( unsigned n )            { int r; assert( n >= 0 ); if ( n < 2 ) return n; for ( r = 0, n--; n; n /= 10, r++ ); return r; }
+
+static inline Hop_Obj_t *  Hop_Regular( Hop_Obj_t * p )           { return (Hop_Obj_t *)((unsigned long)(p) & ~01);      }
+static inline Hop_Obj_t *  Hop_Not( Hop_Obj_t * p )               { return (Hop_Obj_t *)((unsigned long)(p) ^  01);      }
+static inline Hop_Obj_t *  Hop_NotCond( Hop_Obj_t * p, int c )    { return (Hop_Obj_t *)((unsigned long)(p) ^ (c));      }
+static inline int          Hop_IsComplement( Hop_Obj_t * p )      { return (int )(((unsigned long)p) & 01);              }
+
+static inline Hop_Obj_t *  Hop_ManConst0( Hop_Man_t * p )         { return Hop_Not(p->pConst1);                     }
+static inline Hop_Obj_t *  Hop_ManConst1( Hop_Man_t * p )         { return p->pConst1;                              }
+static inline Hop_Obj_t *  Hop_ManGhost( Hop_Man_t * p )          { return &p->Ghost;                               }
+static inline Hop_Obj_t *  Hop_ManPi( Hop_Man_t * p, int i )      { return (Hop_Obj_t *)Vec_PtrEntry(p->vPis, i);   }
+static inline Hop_Obj_t *  Hop_ManPo( Hop_Man_t * p, int i )      { return (Hop_Obj_t *)Vec_PtrEntry(p->vPos, i);   }
+static inline Hop_Obj_t *  Hop_ManObj( Hop_Man_t * p, int i )     { return p->vObjs ? (Hop_Obj_t *)Vec_PtrEntry(p->vObjs, i) : NULL;  }
+
+static inline Hop_Edge_t   Hop_EdgeCreate( int Id, int fCompl )            { return (Id << 1) | fCompl;             }
+static inline int          Hop_EdgeId( Hop_Edge_t Edge )                   { return Edge >> 1;                      }
+static inline int          Hop_EdgeIsComplement( Hop_Edge_t Edge )         { return Edge & 1;                       }
+static inline Hop_Edge_t   Hop_EdgeRegular( Hop_Edge_t Edge )              { return (Edge >> 1) << 1;               }
+static inline Hop_Edge_t   Hop_EdgeNot( Hop_Edge_t Edge )                  { return Edge ^ 1;                       }
+static inline Hop_Edge_t   Hop_EdgeNotCond( Hop_Edge_t Edge, int fCond )   { return Edge ^ fCond;                   }
+
+static inline int          Hop_ManPiNum( Hop_Man_t * p )          { return p->nObjs[AIG_PI];                    }
+static inline int          Hop_ManPoNum( Hop_Man_t * p )          { return p->nObjs[AIG_PO];                    }
+static inline int          Hop_ManAndNum( Hop_Man_t * p )         { return p->nObjs[AIG_AND];                   }
+static inline int          Hop_ManExorNum( Hop_Man_t * p )        { return p->nObjs[AIG_EXOR];                  }
+static inline int          Hop_ManNodeNum( Hop_Man_t * p )        { return p->nObjs[AIG_AND]+p->nObjs[AIG_EXOR];}
+static inline int          Hop_ManGetCost( Hop_Man_t * p )        { return p->nObjs[AIG_AND]+3*p->nObjs[AIG_EXOR]; }
+static inline int          Hop_ManObjNum( Hop_Man_t * p )         { return p->nCreated - p->nDeleted;           }
+
+static inline Hop_Type_t   Hop_ObjType( Hop_Obj_t * pObj )        { return (Hop_Type_t)pObj->Type;               }
+static inline int          Hop_ObjIsNone( Hop_Obj_t * pObj )      { return pObj->Type == AIG_NONE;   }
+static inline int          Hop_ObjIsConst1( Hop_Obj_t * pObj )    { assert(!Hop_IsComplement(pObj)); return pObj->Type == AIG_CONST1; }
+static inline int          Hop_ObjIsPi( Hop_Obj_t * pObj )        { return pObj->Type == AIG_PI;     }
+static inline int          Hop_ObjIsPo( Hop_Obj_t * pObj )        { return pObj->Type == AIG_PO;     }
+static inline int          Hop_ObjIsAnd( Hop_Obj_t * pObj )       { return pObj->Type == AIG_AND;    }
+static inline int          Hop_ObjIsExor( Hop_Obj_t * pObj )      { return pObj->Type == AIG_EXOR;   }
+static inline int          Hop_ObjIsNode( Hop_Obj_t * pObj )      { return pObj->Type == AIG_AND || pObj->Type == AIG_EXOR;   }
+static inline int          Hop_ObjIsTerm( Hop_Obj_t * pObj )      { return pObj->Type == AIG_PI  || pObj->Type == AIG_PO || pObj->Type == AIG_CONST1; }
+static inline int          Hop_ObjIsHash( Hop_Obj_t * pObj )      { return pObj->Type == AIG_AND || pObj->Type == AIG_EXOR;   }
+
+static inline int          Hop_ObjIsMarkA( Hop_Obj_t * pObj )     { return pObj->fMarkA;  }
+static inline void         Hop_ObjSetMarkA( Hop_Obj_t * pObj )    { pObj->fMarkA = 1;     }
+static inline void         Hop_ObjClearMarkA( Hop_Obj_t * pObj )  { pObj->fMarkA = 0;     }
+ 
+static inline void         Hop_ObjSetTravId( Hop_Obj_t * pObj, int TravId )                { pObj->pData = (void *)TravId;                       }
+static inline void         Hop_ObjSetTravIdCurrent( Hop_Man_t * p, Hop_Obj_t * pObj )      { pObj->pData = (void *)p->nTravIds;                  }
+static inline void         Hop_ObjSetTravIdPrevious( Hop_Man_t * p, Hop_Obj_t * pObj )     { pObj->pData = (void *)(p->nTravIds - 1);            }
+static inline int          Hop_ObjIsTravIdCurrent( Hop_Man_t * p, Hop_Obj_t * pObj )       { return (int )((int)pObj->pData == p->nTravIds);     }
+static inline int          Hop_ObjIsTravIdPrevious( Hop_Man_t * p, Hop_Obj_t * pObj )      { return (int )((int)pObj->pData == p->nTravIds - 1); }
+
+static inline int          Hop_ObjTravId( Hop_Obj_t * pObj )      { return (int)pObj->pData;                       }
+static inline int          Hop_ObjPhase( Hop_Obj_t * pObj )       { return pObj->fPhase;                           }
+static inline int          Hop_ObjRefs( Hop_Obj_t * pObj )        { return pObj->nRefs;                            }
+static inline void         Hop_ObjRef( Hop_Obj_t * pObj )         { pObj->nRefs++;                                 }
+static inline void         Hop_ObjDeref( Hop_Obj_t * pObj )       { assert( pObj->nRefs > 0 ); pObj->nRefs--;      }
+static inline void         Hop_ObjClearRef( Hop_Obj_t * pObj )    { pObj->nRefs = 0;                               }
+static inline int          Hop_ObjFaninC0( Hop_Obj_t * pObj )     { return Hop_IsComplement(pObj->pFanin0);        }
+static inline int          Hop_ObjFaninC1( Hop_Obj_t * pObj )     { return Hop_IsComplement(pObj->pFanin1);        }
+static inline Hop_Obj_t *  Hop_ObjFanin0( Hop_Obj_t * pObj )      { return Hop_Regular(pObj->pFanin0);             }
+static inline Hop_Obj_t *  Hop_ObjFanin1( Hop_Obj_t * pObj )      { return Hop_Regular(pObj->pFanin1);             }
+static inline Hop_Obj_t *  Hop_ObjChild0( Hop_Obj_t * pObj )      { return pObj->pFanin0;                          }
+static inline Hop_Obj_t *  Hop_ObjChild1( Hop_Obj_t * pObj )      { return pObj->pFanin1;                          }
+static inline Hop_Obj_t *  Hop_ObjChild0Copy( Hop_Obj_t * pObj ) { assert( !Hop_IsComplement(pObj) ); return Hop_ObjFanin0(pObj)? Hop_NotCond((Hop_Obj_t *)Hop_ObjFanin0(pObj)->pData, Hop_ObjFaninC0(pObj)) : NULL;  }
+static inline Hop_Obj_t *  Hop_ObjChild1Copy( Hop_Obj_t * pObj ) { assert( !Hop_IsComplement(pObj) ); return Hop_ObjFanin1(pObj)? Hop_NotCond((Hop_Obj_t *)Hop_ObjFanin1(pObj)->pData, Hop_ObjFaninC1(pObj)) : NULL;  }
+static inline int          Hop_ObjLevel( Hop_Obj_t * pObj )       { return pObj->nRefs;                            }
+static inline int          Hop_ObjLevelNew( Hop_Obj_t * pObj )    { return 1 + Hop_ObjIsExor(pObj) + AIG_MAX(Hop_ObjFanin0(pObj)->nRefs, Hop_ObjFanin1(pObj)->nRefs);       }
+static inline int          Hop_ObjFaninPhase( Hop_Obj_t * pObj )  { return Hop_IsComplement(pObj)? !Hop_Regular(pObj)->fPhase : pObj->fPhase; }
+static inline void         Hop_ObjClean( Hop_Obj_t * pObj )       { memset( pObj, 0, sizeof(Hop_Obj_t) ); }
+static inline int          Hop_ObjWhatFanin( Hop_Obj_t * pObj, Hop_Obj_t * pFanin )    
+{ 
+    if ( Hop_ObjFanin0(pObj) == pFanin ) return 0; 
+    if ( Hop_ObjFanin1(pObj) == pFanin ) return 1; 
+    assert(0); return -1; 
+}
+static inline int          Hop_ObjFanoutC( Hop_Obj_t * pObj, Hop_Obj_t * pFanout )    
+{ 
+    if ( Hop_ObjFanin0(pFanout) == pObj ) return Hop_ObjFaninC0(pObj); 
+    if ( Hop_ObjFanin1(pFanout) == pObj ) return Hop_ObjFaninC1(pObj); 
+    assert(0); return -1; 
+}
+
+// create the ghost of the new node
+static inline Hop_Obj_t *  Hop_ObjCreateGhost( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1, Hop_Type_t Type )    
+{
+    Hop_Obj_t * pGhost;
+    assert( Type != AIG_AND || !Hop_ObjIsConst1(Hop_Regular(p0)) );
+    assert( p1 == NULL || !Hop_ObjIsConst1(Hop_Regular(p1)) );
+    assert( Type == AIG_PI || Hop_Regular(p0) != Hop_Regular(p1) );
+    pGhost = Hop_ManGhost(p);
+    pGhost->Type = Type;
+    if ( Hop_Regular(p0)->Id < Hop_Regular(p1)->Id )
+    {
+        pGhost->pFanin0 = p0;
+        pGhost->pFanin1 = p1;
+    }
+    else
+    {
+        pGhost->pFanin0 = p1;
+        pGhost->pFanin1 = p0;
+    }
+    return pGhost;
+}
+
+// internal memory manager
+static inline Hop_Obj_t * Hop_ManFetchMemory( Hop_Man_t * p )  
+{ 
+    extern void Hop_ManAddMemory( Hop_Man_t * p );
+    Hop_Obj_t * pTemp;
+    if ( p->pListFree == NULL )
+        Hop_ManAddMemory( p );
+    pTemp = p->pListFree;
+    p->pListFree = *((Hop_Obj_t **)pTemp);
+    memset( pTemp, 0, sizeof(Hop_Obj_t) ); 
+    if ( p->vObjs )
+    {
+        assert( p->nCreated == Vec_PtrSize(p->vObjs) );
+        Vec_PtrPush( p->vObjs, pTemp );
+    }
+    pTemp->Id = p->nCreated++;
+    return pTemp;
+}
+static inline void Hop_ManRecycleMemory( Hop_Man_t * p, Hop_Obj_t * pEntry )
+{
+    pEntry->Type = AIG_NONE; // distinquishes dead node from live node
+    *((Hop_Obj_t **)pEntry) = p->pListFree;
+    p->pListFree = pEntry;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over the primary inputs
+#define Hop_ManForEachPi( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPis, pObj, i )
+// iterator over the primary outputs
+#define Hop_ManForEachPo( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPos, pObj, i )
+// iterator over all objects, including those currently not used
+#define Hop_ManForEachNode( p, pObj, i )                                        \
+    for ( i = 0; i < p->nTableSize; i++ )                                       \
+        if ( ((pObj) = p->pTable[i]) == NULL ) {} else
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== hopBalance.c ========================================================*/
+extern Hop_Man_t *     Hop_ManBalance( Hop_Man_t * p, int fUpdateLevel );
+extern Hop_Obj_t *     Hop_NodeBalanceBuildSuper( Hop_Man_t * p, Vec_Ptr_t * vSuper, Hop_Type_t Type, int fUpdateLevel );
+/*=== hopCheck.c ========================================================*/
+extern int             Hop_ManCheck( Hop_Man_t * p );
+/*=== hopDfs.c ==========================================================*/
+extern Vec_Ptr_t *     Hop_ManDfs( Hop_Man_t * p );
+extern Vec_Ptr_t *     Hop_ManDfsNode( Hop_Man_t * p, Hop_Obj_t * pNode );
+extern int             Hop_ManCountLevels( Hop_Man_t * p );
+extern void            Hop_ManCreateRefs( Hop_Man_t * p );
+extern int             Hop_DagSize( Hop_Obj_t * pObj );
+extern void            Hop_ConeUnmark_rec( Hop_Obj_t * pObj );
+extern Hop_Obj_t *     Hop_Transfer( Hop_Man_t * pSour, Hop_Man_t * pDest, Hop_Obj_t * pObj, int nVars );
+extern Hop_Obj_t *     Hop_Compose( Hop_Man_t * p, Hop_Obj_t * pRoot, Hop_Obj_t * pFunc, int iVar );
+/*=== hopMan.c ==========================================================*/
+extern Hop_Man_t *     Hop_ManStart();
+extern Hop_Man_t *     Hop_ManDup( Hop_Man_t * p );
+extern void            Hop_ManStop( Hop_Man_t * p );
+extern int             Hop_ManCleanup( Hop_Man_t * p );
+extern void            Hop_ManPrintStats( Hop_Man_t * p );
+/*=== hopMem.c ==========================================================*/
+extern void            Hop_ManStartMemory( Hop_Man_t * p );
+extern void            Hop_ManStopMemory( Hop_Man_t * p );
+/*=== hopObj.c ==========================================================*/
+extern Hop_Obj_t *     Hop_ObjCreatePi( Hop_Man_t * p );
+extern Hop_Obj_t *     Hop_ObjCreatePo( Hop_Man_t * p, Hop_Obj_t * pDriver );
+extern Hop_Obj_t *     Hop_ObjCreate( Hop_Man_t * p, Hop_Obj_t * pGhost );
+extern void            Hop_ObjConnect( Hop_Man_t * p, Hop_Obj_t * pObj, Hop_Obj_t * pFan0, Hop_Obj_t * pFan1 );
+extern void            Hop_ObjDisconnect( Hop_Man_t * p, Hop_Obj_t * pObj );
+extern void            Hop_ObjDelete( Hop_Man_t * p, Hop_Obj_t * pObj );
+extern void            Hop_ObjDelete_rec( Hop_Man_t * p, Hop_Obj_t * pObj );
+extern Hop_Obj_t *     Hop_ObjRepr( Hop_Obj_t * pObj );
+extern void            Hop_ObjCreateChoice( Hop_Obj_t * pOld, Hop_Obj_t * pNew );
+/*=== hopOper.c =========================================================*/
+extern Hop_Obj_t *     Hop_IthVar( Hop_Man_t * p, int i );
+extern Hop_Obj_t *     Hop_Oper( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1, Hop_Type_t Type );
+extern Hop_Obj_t *     Hop_And( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 );
+extern Hop_Obj_t *     Hop_Or( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 );
+extern Hop_Obj_t *     Hop_Exor( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 );
+extern Hop_Obj_t *     Hop_Mux( Hop_Man_t * p, Hop_Obj_t * pC, Hop_Obj_t * p1, Hop_Obj_t * p0 );
+extern Hop_Obj_t *     Hop_Maj( Hop_Man_t * p, Hop_Obj_t * pA, Hop_Obj_t * pB, Hop_Obj_t * pC );
+extern Hop_Obj_t *     Hop_Miter( Hop_Man_t * p, Vec_Ptr_t * vPairs );
+extern Hop_Obj_t *     Hop_CreateAnd( Hop_Man_t * p, int nVars );
+extern Hop_Obj_t *     Hop_CreateOr( Hop_Man_t * p, int nVars );
+extern Hop_Obj_t *     Hop_CreateExor( Hop_Man_t * p, int nVars );
+/*=== hopTable.c ========================================================*/
+extern Hop_Obj_t *     Hop_TableLookup( Hop_Man_t * p, Hop_Obj_t * pGhost );
+extern void            Hop_TableInsert( Hop_Man_t * p, Hop_Obj_t * pObj );
+extern void            Hop_TableDelete( Hop_Man_t * p, Hop_Obj_t * pObj );
+extern int             Hop_TableCountEntries( Hop_Man_t * p );
+extern void            Hop_TableProfile( Hop_Man_t * p );
+/*=== hopUtil.c =========================================================*/
+extern void            Hop_ManIncrementTravId( Hop_Man_t * p );
+extern void            Hop_ManCleanData( Hop_Man_t * p );
+extern void            Hop_ObjCleanData_rec( Hop_Obj_t * pObj );
+extern void            Hop_ObjCollectMulti( Hop_Obj_t * pFunc, Vec_Ptr_t * vSuper );
+extern int             Hop_ObjIsMuxType( Hop_Obj_t * pObj );
+extern int             Hop_ObjRecognizeExor( Hop_Obj_t * pObj, Hop_Obj_t ** ppFan0, Hop_Obj_t ** ppFan1 );
+extern Hop_Obj_t *     Hop_ObjRecognizeMux( Hop_Obj_t * pObj, Hop_Obj_t ** ppObjT, Hop_Obj_t ** ppObjE );
+extern void            Hop_ObjPrintEqn( FILE * pFile, Hop_Obj_t * pObj, Vec_Vec_t * vLevels, int Level );
+extern void            Hop_ObjPrintVerilog( FILE * pFile, Hop_Obj_t * pObj, Vec_Vec_t * vLevels, int Level );
+extern void            Hop_ObjPrintVerbose( Hop_Obj_t * pObj, int fHaig );
+extern void            Hop_ManPrintVerbose( Hop_Man_t * p, int fHaig );
+extern void            Hop_ManDumpBlif( Hop_Man_t * p, char * pFileName );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/hop/hopBalance.c b/abc70930/src/aig/hop/hopBalance.c
new file mode 100644
index 00000000..73c90685
--- /dev/null
+++ b/abc70930/src/aig/hop/hopBalance.c
@@ -0,0 +1,391 @@
+/**CFile****************************************************************
+
+  FileName    [hopBalance.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [Algebraic AIG balancing.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopBalance.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Hop_Obj_t * Hop_NodeBalance_rec( Hop_Man_t * pNew, Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level, int fUpdateLevel );
+static Vec_Ptr_t * Hop_NodeBalanceCone( Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level );
+static int         Hop_NodeBalanceFindLeft( Vec_Ptr_t * vSuper );
+static void        Hop_NodeBalancePermute( Hop_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor );
+static void        Hop_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Hop_Obj_t * pObj );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs algebraic balancing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Man_t * Hop_ManBalance( Hop_Man_t * p, int fUpdateLevel )
+{
+    Hop_Man_t * pNew;
+    Hop_Obj_t * pObj, * pObjNew;
+    Vec_Vec_t * vStore;
+    int i;
+    // create the new manager 
+    pNew = Hop_ManStart();
+    pNew->fRefCount = 0;
+    // map the PI nodes
+    Hop_ManCleanData( p );
+    Hop_ManConst1(p)->pData = Hop_ManConst1(pNew);
+    Hop_ManForEachPi( p, pObj, i )
+        pObj->pData = Hop_ObjCreatePi(pNew);
+    // balance the AIG
+    vStore = Vec_VecAlloc( 50 );
+    Hop_ManForEachPo( p, pObj, i )
+    {
+        pObjNew = Hop_NodeBalance_rec( pNew, Hop_ObjFanin0(pObj), vStore, 0, fUpdateLevel );
+        Hop_ObjCreatePo( pNew, Hop_NotCond( pObjNew, Hop_ObjFaninC0(pObj) ) );
+    }
+    Vec_VecFree( vStore );
+    // remove dangling nodes
+//    Hop_ManCreateRefs( pNew );
+//    if ( i = Hop_ManCleanup( pNew ) )
+//        printf( "Cleanup after balancing removed %d dangling nodes.\n", i );
+    // check the resulting AIG
+    if ( !Hop_ManCheck(pNew) )
+        printf( "Hop_ManBalance(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the new node constructed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_NodeBalance_rec( Hop_Man_t * pNew, Hop_Obj_t * pObjOld, Vec_Vec_t * vStore, int Level, int fUpdateLevel )
+{
+    Hop_Obj_t * pObjNew;
+    Vec_Ptr_t * vSuper;
+    int i;
+    assert( !Hop_IsComplement(pObjOld) );
+    // return if the result is known
+    if ( pObjOld->pData )
+        return pObjOld->pData;
+    assert( Hop_ObjIsNode(pObjOld) );
+    // get the implication supergate
+    vSuper = Hop_NodeBalanceCone( pObjOld, vStore, Level );
+    // check if supergate contains two nodes in the opposite polarity
+    if ( vSuper->nSize == 0 )
+        return pObjOld->pData = Hop_ManConst0(pNew);
+    if ( Vec_PtrSize(vSuper) < 2 )
+        printf( "BUG!\n" );
+    // for each old node, derive the new well-balanced node
+    for ( i = 0; i < Vec_PtrSize(vSuper); i++ )
+    {
+        pObjNew = Hop_NodeBalance_rec( pNew, Hop_Regular(vSuper->pArray[i]), vStore, Level + 1, fUpdateLevel );
+        vSuper->pArray[i] = Hop_NotCond( pObjNew, Hop_IsComplement(vSuper->pArray[i]) );
+    }
+    // build the supergate
+    pObjNew = Hop_NodeBalanceBuildSuper( pNew, vSuper, Hop_ObjType(pObjOld), fUpdateLevel );
+    // make sure the balanced node is not assigned
+//    assert( pObjOld->Level >= Hop_Regular(pObjNew)->Level );
+    assert( pObjOld->pData == NULL );
+    return pObjOld->pData = pObjNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_NodeBalanceCone_rec( Hop_Obj_t * pRoot, Hop_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    int RetValue1, RetValue2, i;
+    // check if the node is visited
+    if ( Hop_Regular(pObj)->fMarkB )
+    {
+        // check if the node occurs in the same polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == pObj )
+                return 1;
+        // check if the node is present in the opposite polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == Hop_Not(pObj) )
+                return -1;
+        assert( 0 );
+        return 0;
+    }
+    // if the new node is complemented or a PI, another gate begins
+    if ( pObj != pRoot && (Hop_IsComplement(pObj) || Hop_ObjType(pObj) != Hop_ObjType(pRoot) || Hop_ObjRefs(pObj) > 1) )
+    {
+        Vec_PtrPush( vSuper, pObj );
+        Hop_Regular(pObj)->fMarkB = 1;
+        return 0;
+    }
+    assert( !Hop_IsComplement(pObj) );
+    assert( Hop_ObjIsNode(pObj) );
+    // go through the branches
+    RetValue1 = Hop_NodeBalanceCone_rec( pRoot, Hop_ObjChild0(pObj), vSuper );
+    RetValue2 = Hop_NodeBalanceCone_rec( pRoot, Hop_ObjChild1(pObj), vSuper );
+    if ( RetValue1 == -1 || RetValue2 == -1 )
+        return -1;
+    // return 1 if at least one branch has a duplicate
+    return RetValue1 || RetValue2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Hop_NodeBalanceCone( Hop_Obj_t * pObj, Vec_Vec_t * vStore, int Level )
+{
+    Vec_Ptr_t * vNodes;
+    int RetValue, i;
+    assert( !Hop_IsComplement(pObj) );
+    // extend the storage
+    if ( Vec_VecSize( vStore ) <= Level )
+        Vec_VecPush( vStore, Level, 0 );
+    // get the temporary array of nodes
+    vNodes = Vec_VecEntry( vStore, Level );
+    Vec_PtrClear( vNodes );
+    // collect the nodes in the implication supergate
+    RetValue = Hop_NodeBalanceCone_rec( pObj, pObj, vNodes );
+    assert( vNodes->nSize > 1 );
+    // unmark the visited nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Hop_Regular(pObj)->fMarkB = 0;
+    // if we found the node and its complement in the same implication supergate, 
+    // return empty set of nodes (meaning that we should use constant-0 node)
+    if ( RetValue == -1 )
+        vNodes->nSize = 0;
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Procedure used for sorting the nodes in decreasing order of levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_NodeCompareLevelsDecrease( Hop_Obj_t ** pp1, Hop_Obj_t ** pp2 )
+{
+    int Diff = Hop_ObjLevel(Hop_Regular(*pp1)) - Hop_ObjLevel(Hop_Regular(*pp2));
+    if ( Diff > 0 )
+        return -1;
+    if ( Diff < 0 ) 
+        return 1;
+    return 0; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Builds implication supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_NodeBalanceBuildSuper( Hop_Man_t * p, Vec_Ptr_t * vSuper, Hop_Type_t Type, int fUpdateLevel )
+{
+    Hop_Obj_t * pObj1, * pObj2;
+    int LeftBound;
+    assert( vSuper->nSize > 1 );
+    // sort the new nodes by level in the decreasing order
+    Vec_PtrSort( vSuper, Hop_NodeCompareLevelsDecrease );
+    // balance the nodes
+    while ( vSuper->nSize > 1 )
+    {
+        // find the left bound on the node to be paired
+        LeftBound = (!fUpdateLevel)? 0 : Hop_NodeBalanceFindLeft( vSuper );
+        // find the node that can be shared (if no such node, randomize choice)
+        Hop_NodeBalancePermute( p, vSuper, LeftBound, Type == AIG_EXOR );
+        // pull out the last two nodes
+        pObj1 = Vec_PtrPop(vSuper);
+        pObj2 = Vec_PtrPop(vSuper);
+        Hop_NodeBalancePushUniqueOrderByLevel( vSuper, Hop_Oper(p, pObj1, pObj2, Type) );
+    }
+    return Vec_PtrEntry(vSuper, 0);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finds the left bound on the next candidate to be paired.]
+
+  Description [The nodes in the array are in the decreasing order of levels. 
+  The last node in the array has the smallest level. By default it would be paired 
+  with the next node on the left. However, it may be possible to pair it with some
+  other node on the left, in such a way that the new node is shared. This procedure
+  finds the index of the left-most node, which can be paired with the last node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_NodeBalanceFindLeft( Vec_Ptr_t * vSuper )
+{
+    Hop_Obj_t * pObjRight, * pObjLeft;
+    int Current;
+    // if two or less nodes, pair with the first
+    if ( Vec_PtrSize(vSuper) < 3 )
+        return 0;
+    // set the pointer to the one before the last
+    Current = Vec_PtrSize(vSuper) - 2;
+    pObjRight = Vec_PtrEntry( vSuper, Current );
+    // go through the nodes to the left of this one
+    for ( Current--; Current >= 0; Current-- )
+    {
+        // get the next node on the left
+        pObjLeft = Vec_PtrEntry( vSuper, Current );
+        // if the level of this node is different, quit the loop
+        if ( Hop_ObjLevel(Hop_Regular(pObjLeft)) != Hop_ObjLevel(Hop_Regular(pObjRight)) )
+            break;
+    }
+    Current++;    
+    // get the node, for which the equality holds
+    pObjLeft = Vec_PtrEntry( vSuper, Current );
+    assert( Hop_ObjLevel(Hop_Regular(pObjLeft)) == Hop_ObjLevel(Hop_Regular(pObjRight)) );
+    return Current;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Moves closer to the end the node that is best for sharing.]
+
+  Description [If there is no node with sharing, randomly chooses one of 
+  the legal nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_NodeBalancePermute( Hop_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor )
+{
+    Hop_Obj_t * pObj1, * pObj2, * pObj3, * pGhost;
+    int RightBound, i;
+    // get the right bound
+    RightBound = Vec_PtrSize(vSuper) - 2;
+    assert( LeftBound <= RightBound );
+    if ( LeftBound == RightBound )
+        return;
+    // get the two last nodes
+    pObj1 = Vec_PtrEntry( vSuper, RightBound + 1 );
+    pObj2 = Vec_PtrEntry( vSuper, RightBound     );
+    if ( Hop_Regular(pObj1) == p->pConst1 || Hop_Regular(pObj2) == p->pConst1 )
+        return;
+    // find the first node that can be shared
+    for ( i = RightBound; i >= LeftBound; i-- )
+    {
+        pObj3 = Vec_PtrEntry( vSuper, i );
+        if ( Hop_Regular(pObj3) == p->pConst1 )
+        {
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+        pGhost = Hop_ObjCreateGhost( p, pObj1, pObj3, fExor? AIG_EXOR : AIG_AND );
+        if ( Hop_TableLookup( p, pGhost ) )
+        {
+            if ( pObj3 == pObj2 )
+                return;
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+    }
+/*
+    // we did not find the node to share, randomize choice
+    {
+        int Choice = rand() % (RightBound - LeftBound + 1);
+        pObj3 = Vec_PtrEntry( vSuper, LeftBound + Choice );
+        if ( pObj3 == pObj2 )
+            return;
+        Vec_PtrWriteEntry( vSuper, LeftBound + Choice, pObj2 );
+        Vec_PtrWriteEntry( vSuper, RightBound,         pObj3 );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts a new node in the order by levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Hop_Obj_t * pObj )
+{
+    Hop_Obj_t * pObj1, * pObj2;
+    int i;
+    if ( Vec_PtrPushUnique(vStore, pObj) )
+        return;
+    // find the p of the node
+    for ( i = vStore->nSize-1; i > 0; i-- )
+    {
+        pObj1 = vStore->pArray[i  ];
+        pObj2 = vStore->pArray[i-1];
+        if ( Hop_ObjLevel(Hop_Regular(pObj1)) <= Hop_ObjLevel(Hop_Regular(pObj2)) )
+            break;
+        vStore->pArray[i  ] = pObj2;
+        vStore->pArray[i-1] = pObj1;
+    }
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopCheck.c b/abc70930/src/aig/hop/hopCheck.c
new file mode 100644
index 00000000..9120906f
--- /dev/null
+++ b/abc70930/src/aig/hop/hopCheck.c
@@ -0,0 +1,110 @@
+/**CFile****************************************************************
+
+  FileName    [hopCheck.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [AIG checking procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopCheck.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Checks the consistency of the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ManCheck( Hop_Man_t * p )
+{
+    Hop_Obj_t * pObj, * pObj2;
+    int i;
+    // check primary inputs
+    Hop_ManForEachPi( p, pObj, i )
+    {
+        if ( Hop_ObjFanin0(pObj) || Hop_ObjFanin1(pObj) )
+        {
+            printf( "Hop_ManCheck: The PI node \"%p\" has fanins.\n", pObj );
+            return 0;
+        }
+    }
+    // check primary outputs
+    Hop_ManForEachPo( p, pObj, i )
+    {
+        if ( !Hop_ObjFanin0(pObj) )
+        {
+            printf( "Hop_ManCheck: The PO node \"%p\" has NULL fanin.\n", pObj );
+            return 0;
+        }
+        if ( Hop_ObjFanin1(pObj) )
+        {
+            printf( "Hop_ManCheck: The PO node \"%p\" has second fanin.\n", pObj );
+            return 0;
+        }
+    }
+    // check internal nodes
+    Hop_ManForEachNode( p, pObj, i )
+    {
+        if ( !Hop_ObjFanin0(pObj) || !Hop_ObjFanin1(pObj) )
+        {
+            printf( "Hop_ManCheck: The AIG has internal node \"%p\" with a NULL fanin.\n", pObj );
+            return 0;
+        }
+        if ( Hop_ObjFanin0(pObj)->Id >= Hop_ObjFanin1(pObj)->Id )
+        {
+            printf( "Hop_ManCheck: The AIG has node \"%p\" with a wrong ordering of fanins.\n", pObj );
+            return 0;
+        }
+        pObj2 = Hop_TableLookup( p, pObj );
+        if ( pObj2 != pObj )
+        {
+            printf( "Hop_ManCheck: Node \"%p\" is not in the structural hashing table.\n", pObj );
+            return 0;
+        }
+    }
+    // count the total number of nodes
+    if ( Hop_ManObjNum(p) != 1 + Hop_ManPiNum(p) + Hop_ManPoNum(p) + Hop_ManAndNum(p) + Hop_ManExorNum(p) )
+    {
+        printf( "Hop_ManCheck: The number of created nodes is wrong.\n" );
+        return 0;
+    }
+    // count the number of nodes in the table
+    if ( Hop_TableCountEntries(p) != Hop_ManAndNum(p) + Hop_ManExorNum(p) )
+    {
+        printf( "Hop_ManCheck: The number of nodes in the structural hashing table is wrong.\n" );
+        return 0;
+    }
+//    if ( !Hop_ManIsAcyclic(p) )
+//        return 0;
+    return 1; 
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopDfs.c b/abc70930/src/aig/hop/hopDfs.c
new file mode 100644
index 00000000..49e5f221
--- /dev/null
+++ b/abc70930/src/aig/hop/hopDfs.c
@@ -0,0 +1,399 @@
+/**CFile****************************************************************
+
+  FileName    [hopDfs.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [DFS traversal procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopDfs.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManDfs_rec( Hop_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
+        return;
+    Hop_ManDfs_rec( Hop_ObjFanin0(pObj), vNodes );
+    Hop_ManDfs_rec( Hop_ObjFanin1(pObj), vNodes );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA(pObj);
+    Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Hop_ManDfs( Hop_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Hop_Obj_t * pObj;
+    int i;
+    vNodes = Vec_PtrAlloc( Hop_ManNodeNum(p) );
+    Hop_ManForEachNode( p, pObj, i )
+        Hop_ManDfs_rec( pObj, vNodes );
+    Hop_ManForEachNode( p, pObj, i )
+        Hop_ObjClearMarkA(pObj);
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects internal nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Hop_ManDfsNode( Hop_Man_t * p, Hop_Obj_t * pNode )
+{
+    Vec_Ptr_t * vNodes;
+    Hop_Obj_t * pObj;
+    int i;
+    assert( !Hop_IsComplement(pNode) );
+    vNodes = Vec_PtrAlloc( 16 );
+    Hop_ManDfs_rec( pNode, vNodes );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Hop_ObjClearMarkA(pObj);
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the max number of levels in the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ManCountLevels( Hop_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Hop_Obj_t * pObj;
+    int i, LevelsMax, Level0, Level1;
+    // initialize the levels
+    Hop_ManConst1(p)->pData = NULL;
+    Hop_ManForEachPi( p, pObj, i )
+        pObj->pData = NULL;
+    // compute levels in a DFS order
+    vNodes = Hop_ManDfs( p );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        Level0 = (int)Hop_ObjFanin0(pObj)->pData;
+        Level1 = (int)Hop_ObjFanin1(pObj)->pData;
+        pObj->pData = (void *)(1 + Hop_ObjIsExor(pObj) + AIG_MAX(Level0, Level1));
+    }
+    Vec_PtrFree( vNodes );
+    // get levels of the POs
+    LevelsMax = 0;
+    Hop_ManForEachPo( p, pObj, i )
+        LevelsMax = AIG_MAX( LevelsMax, (int)Hop_ObjFanin0(pObj)->pData );
+    return LevelsMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates correct reference counters at each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManCreateRefs( Hop_Man_t * p )
+{
+    Hop_Obj_t * pObj;
+    int i;
+    if ( p->fRefCount )
+        return;
+    p->fRefCount = 1;
+    // clear refs
+    Hop_ObjClearRef( Hop_ManConst1(p) );
+    Hop_ManForEachPi( p, pObj, i )
+        Hop_ObjClearRef( pObj );
+    Hop_ManForEachNode( p, pObj, i )
+        Hop_ObjClearRef( pObj );
+    Hop_ManForEachPo( p, pObj, i )
+        Hop_ObjClearRef( pObj );
+    // set refs
+    Hop_ManForEachNode( p, pObj, i )
+    {
+        Hop_ObjRef( Hop_ObjFanin0(pObj) );
+        Hop_ObjRef( Hop_ObjFanin1(pObj) );
+    }
+    Hop_ManForEachPo( p, pObj, i )
+        Hop_ObjRef( Hop_ObjFanin0(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ConeMark_rec( Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
+        return;
+    Hop_ConeMark_rec( Hop_ObjFanin0(pObj) );
+    Hop_ConeMark_rec( Hop_ObjFanin1(pObj) );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ConeCleanAndMark_rec( Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
+        return;
+    Hop_ConeCleanAndMark_rec( Hop_ObjFanin0(pObj) );
+    Hop_ConeCleanAndMark_rec( Hop_ObjFanin1(pObj) );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA( pObj );
+    pObj->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ConeCountAndMark_rec( Hop_Obj_t * pObj )
+{
+    int Counter;
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
+        return 0;
+    Counter = 1 + Hop_ConeCountAndMark_rec( Hop_ObjFanin0(pObj) ) + 
+        Hop_ConeCountAndMark_rec( Hop_ObjFanin1(pObj) );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA( pObj );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ConeUnmark_rec( Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || !Hop_ObjIsMarkA(pObj) )
+        return;
+    Hop_ConeUnmark_rec( Hop_ObjFanin0(pObj) ); 
+    Hop_ConeUnmark_rec( Hop_ObjFanin1(pObj) );
+    assert( Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjClearMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of AIG nodes rooted at this cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_DagSize( Hop_Obj_t * pObj )
+{
+    int Counter;
+    Counter = Hop_ConeCountAndMark_rec( Hop_Regular(pObj) );
+    Hop_ConeUnmark_rec( Hop_Regular(pObj) );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers the AIG from one manager into another.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_Transfer_rec( Hop_Man_t * pDest, Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) || Hop_ObjIsMarkA(pObj) )
+        return;
+    Hop_Transfer_rec( pDest, Hop_ObjFanin0(pObj) ); 
+    Hop_Transfer_rec( pDest, Hop_ObjFanin1(pObj) );
+    pObj->pData = Hop_And( pDest, Hop_ObjChild0Copy(pObj), Hop_ObjChild1Copy(pObj) );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers the AIG from one manager into another.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Transfer( Hop_Man_t * pSour, Hop_Man_t * pDest, Hop_Obj_t * pRoot, int nVars )
+{
+    Hop_Obj_t * pObj;
+    int i;
+    // solve simple cases
+    if ( pSour == pDest )
+        return pRoot;
+    if ( Hop_ObjIsConst1( Hop_Regular(pRoot) ) )
+        return Hop_NotCond( Hop_ManConst1(pDest), Hop_IsComplement(pRoot) );
+    // set the PI mapping
+    Hop_ManForEachPi( pSour, pObj, i )
+    {
+        if ( i == nVars )
+           break;
+        pObj->pData = Hop_IthVar(pDest, i);
+    }
+    // transfer and set markings
+    Hop_Transfer_rec( pDest, Hop_Regular(pRoot) );
+    // clear the markings
+    Hop_ConeUnmark_rec( Hop_Regular(pRoot) );
+    return Hop_NotCond( Hop_Regular(pRoot)->pData, Hop_IsComplement(pRoot) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_Compose_rec( Hop_Man_t * p, Hop_Obj_t * pObj, Hop_Obj_t * pFunc, Hop_Obj_t * pVar )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( Hop_ObjIsMarkA(pObj) )
+        return;
+    if ( Hop_ObjIsConst1(pObj) || Hop_ObjIsPi(pObj) )
+    {
+        pObj->pData = pObj == pVar ? pFunc : pObj;
+        return;
+    }
+    Hop_Compose_rec( p, Hop_ObjFanin0(pObj), pFunc, pVar ); 
+    Hop_Compose_rec( p, Hop_ObjFanin1(pObj), pFunc, pVar );
+    pObj->pData = Hop_And( p, Hop_ObjChild0Copy(pObj), Hop_ObjChild1Copy(pObj) );
+    assert( !Hop_ObjIsMarkA(pObj) ); // loop detection
+    Hop_ObjSetMarkA( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Compose( Hop_Man_t * p, Hop_Obj_t * pRoot, Hop_Obj_t * pFunc, int iVar )
+{
+    // quit if the PI variable is not defined
+    if ( iVar >= Hop_ManPiNum(p) )
+    {
+        printf( "Hop_Compose(): The PI variable %d is not defined.\n", iVar );
+        return NULL;
+    }
+    // recursively perform composition
+    Hop_Compose_rec( p, Hop_Regular(pRoot), pFunc, Hop_ManPi(p, iVar) );
+    // clear the markings
+    Hop_ConeUnmark_rec( Hop_Regular(pRoot) );
+    return Hop_NotCond( Hop_Regular(pRoot)->pData, Hop_IsComplement(pRoot) );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopMan.c b/abc70930/src/aig/hop/hopMan.c
new file mode 100644
index 00000000..99f5d316
--- /dev/null
+++ b/abc70930/src/aig/hop/hopMan.c
@@ -0,0 +1,164 @@
+/**CFile****************************************************************
+
+  FileName    [hopMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [AIG manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopMan.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Man_t * Hop_ManStart()
+{
+    Hop_Man_t * p;
+    // start the manager
+    p = ALLOC( Hop_Man_t, 1 );
+    memset( p, 0, sizeof(Hop_Man_t) );
+    // perform initializations
+    p->nTravIds = 1;
+    p->fRefCount = 1;
+    p->fCatchExor = 0;
+    // allocate arrays for nodes
+    p->vPis = Vec_PtrAlloc( 100 );
+    p->vPos = Vec_PtrAlloc( 100 );
+    // prepare the internal memory manager
+    Hop_ManStartMemory( p );
+    // create the constant node
+    p->pConst1 = Hop_ManFetchMemory( p );
+    p->pConst1->Type = AIG_CONST1;
+    p->pConst1->fPhase = 1;
+    p->nCreated = 1;
+    // start the table
+//    p->nTableSize = 107;
+    p->nTableSize = 10007;
+    p->pTable = ALLOC( Hop_Obj_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Hop_Obj_t *) * p->nTableSize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManStop( Hop_Man_t * p )
+{
+    Hop_Obj_t * pObj;
+    int i;
+    // make sure the nodes have clean marks
+    pObj = Hop_ManConst1(p);
+    assert( !pObj->fMarkA && !pObj->fMarkB );
+    Hop_ManForEachPi( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    Hop_ManForEachPo( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    Hop_ManForEachNode( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    // print time
+    if ( p->time1 ) { PRT( "time1", p->time1 ); }
+    if ( p->time2 ) { PRT( "time2", p->time2 ); }
+//    Hop_TableProfile( p );
+    if ( p->vChunks )  Hop_ManStopMemory( p );
+    if ( p->vPis )     Vec_PtrFree( p->vPis );
+    if ( p->vPos )     Vec_PtrFree( p->vPos );
+    if ( p->vObjs )    Vec_PtrFree( p->vObjs );
+    free( p->pTable );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ManCleanup( Hop_Man_t * p )
+{
+    Vec_Ptr_t * vObjs;
+    Hop_Obj_t * pNode;
+    int i, nNodesOld;
+    assert( p->fRefCount );
+    nNodesOld = Hop_ManNodeNum(p);
+    // collect roots of dangling nodes
+    vObjs = Vec_PtrAlloc( 100 );
+    Hop_ManForEachNode( p, pNode, i )
+        if ( Hop_ObjRefs(pNode) == 0 )
+            Vec_PtrPush( vObjs, pNode );
+    // recursively remove dangling nodes
+    Vec_PtrForEachEntry( vObjs, pNode, i )
+        Hop_ObjDelete_rec( p, pNode );
+    Vec_PtrFree( vObjs );
+    return nNodesOld - Hop_ManNodeNum(p);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManPrintStats( Hop_Man_t * p )
+{
+    printf( "PI/PO = %d/%d. ", Hop_ManPiNum(p), Hop_ManPoNum(p) );
+    printf( "A = %7d. ",       Hop_ManAndNum(p) );
+    printf( "X = %5d. ",       Hop_ManExorNum(p) );
+    printf( "Cre = %7d. ",     p->nCreated );
+    printf( "Del = %7d. ",     p->nDeleted );
+    printf( "Lev = %3d. ",     Hop_ManCountLevels(p) );
+    printf( "\n" );
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopMem.c b/abc70930/src/aig/hop/hopMem.c
new file mode 100644
index 00000000..0665470a
--- /dev/null
+++ b/abc70930/src/aig/hop/hopMem.c
@@ -0,0 +1,115 @@
+/**CFile****************************************************************
+
+  FileName    [hopMem.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [Memory management for the AIG nodes.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopMem.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// memory management
+#define IVY_PAGE_SIZE      12        // page size containing 2^IVY_PAGE_SIZE nodes
+#define IVY_PAGE_MASK    4095        // page bitmask (2^IVY_PAGE_SIZE)-1
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the internal memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManStartMemory( Hop_Man_t * p )
+{
+    p->vChunks = Vec_PtrAlloc( 128 );
+    p->vPages = Vec_PtrAlloc( 128 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the internal memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManStopMemory( Hop_Man_t * p )
+{
+    void * pMemory;
+    int i;
+    Vec_PtrForEachEntry( p->vChunks, pMemory, i )
+        free( pMemory );
+    Vec_PtrFree( p->vChunks );
+    Vec_PtrFree( p->vPages );
+    p->pListFree = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates additional memory for the nodes.]
+
+  Description [Allocates IVY_PAGE_SIZE nodes. Aligns memory by 32 bytes. 
+  Records the pointer to the AIG manager in the -1 entry.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManAddMemory( Hop_Man_t * p )
+{
+    char * pMemory;
+    int i, nBytes;
+    assert( sizeof(Hop_Obj_t) <= 64 );
+    assert( p->pListFree == NULL );
+//    assert( (Hop_ManObjNum(p) & IVY_PAGE_MASK) == 0 );
+    // allocate new memory page
+    nBytes = sizeof(Hop_Obj_t) * (1<<IVY_PAGE_SIZE) + 64;
+    pMemory = ALLOC( char, nBytes );
+    Vec_PtrPush( p->vChunks, pMemory );
+    // align memory at the 32-byte boundary
+    pMemory = pMemory + 64 - (((int)pMemory) & 63);
+    // remember the manager in the first entry
+    Vec_PtrPush( p->vPages, pMemory );
+    // break the memory down into nodes
+    p->pListFree = (Hop_Obj_t *)pMemory;
+    for ( i = 1; i <= IVY_PAGE_MASK; i++ )
+    {
+        *((char **)pMemory) = pMemory + sizeof(Hop_Obj_t);
+        pMemory += sizeof(Hop_Obj_t);
+    }
+    *((char **)pMemory) = NULL;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopObj.c b/abc70930/src/aig/hop/hopObj.c
new file mode 100644
index 00000000..c8e70dd3
--- /dev/null
+++ b/abc70930/src/aig/hop/hopObj.c
@@ -0,0 +1,271 @@
+/**CFile****************************************************************
+
+  FileName    [hopObj.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [Adding/removing objects.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopObj.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates primary input.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_ObjCreatePi( Hop_Man_t * p )
+{
+    Hop_Obj_t * pObj;
+    pObj = Hop_ManFetchMemory( p );
+    pObj->Type = AIG_PI;
+    Vec_PtrPush( p->vPis, pObj );
+    p->nObjs[AIG_PI]++;
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates primary output with the given driver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_ObjCreatePo( Hop_Man_t * p, Hop_Obj_t * pDriver )
+{
+    Hop_Obj_t * pObj;
+    pObj = Hop_ManFetchMemory( p );
+    pObj->Type = AIG_PO;
+    Vec_PtrPush( p->vPos, pObj );
+    // add connections
+    pObj->pFanin0 = pDriver;
+    if ( p->fRefCount )
+        Hop_ObjRef( Hop_Regular(pDriver) );
+    else
+        pObj->nRefs = Hop_ObjLevel( Hop_Regular(pDriver) );
+    // set the phase
+    pObj->fPhase = Hop_ObjFaninPhase(pDriver);
+    // update node counters of the manager
+    p->nObjs[AIG_PO]++;
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Create the new node assuming it does not exist.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_ObjCreate( Hop_Man_t * p, Hop_Obj_t * pGhost )
+{
+    Hop_Obj_t * pObj;
+    assert( !Hop_IsComplement(pGhost) );
+    assert( Hop_ObjIsNode(pGhost) );
+    assert( pGhost == &p->Ghost );
+    // get memory for the new object
+    pObj = Hop_ManFetchMemory( p );
+    pObj->Type = pGhost->Type;
+    // add connections
+    Hop_ObjConnect( p, pObj, pGhost->pFanin0, pGhost->pFanin1 );
+    // update node counters of the manager
+    p->nObjs[Hop_ObjType(pObj)]++;
+    assert( pObj->pData == NULL );
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Connect the object to the fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjConnect( Hop_Man_t * p, Hop_Obj_t * pObj, Hop_Obj_t * pFan0, Hop_Obj_t * pFan1 )
+{
+    assert( !Hop_IsComplement(pObj) );
+    assert( Hop_ObjIsNode(pObj) );
+    // add the first fanin
+    pObj->pFanin0 = pFan0;
+    pObj->pFanin1 = pFan1;
+    // increment references of the fanins and add their fanouts
+    if ( p->fRefCount )
+    {
+        if ( pFan0 != NULL )
+            Hop_ObjRef( Hop_ObjFanin0(pObj) );
+        if ( pFan1 != NULL )
+            Hop_ObjRef( Hop_ObjFanin1(pObj) );
+    }
+    else
+        pObj->nRefs = Hop_ObjLevelNew( pObj );
+    // set the phase
+    pObj->fPhase = Hop_ObjFaninPhase(pFan0) & Hop_ObjFaninPhase(pFan1);
+    // add the node to the structural hash table
+    Hop_TableInsert( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Connect the object to the fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjDisconnect( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    assert( Hop_ObjIsNode(pObj) );
+    // remove connections
+    if ( pObj->pFanin0 != NULL )
+        Hop_ObjDeref(Hop_ObjFanin0(pObj));
+    if ( pObj->pFanin1 != NULL )
+        Hop_ObjDeref(Hop_ObjFanin1(pObj));
+    // remove the node from the structural hash table
+    Hop_TableDelete( p, pObj );
+    // add the first fanin
+    pObj->pFanin0 = NULL;
+    pObj->pFanin1 = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjDelete( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    assert( !Hop_ObjIsTerm(pObj) );
+    assert( Hop_ObjRefs(pObj) == 0 );
+    // update node counters of the manager
+    p->nObjs[pObj->Type]--;
+    p->nDeleted++;
+    // remove connections
+    Hop_ObjDisconnect( p, pObj );
+    // remove PIs/POs from the arrays
+    if ( Hop_ObjIsPi(pObj) )
+        Vec_PtrRemove( p->vPis, pObj );
+    // free the node
+    Hop_ManRecycleMemory( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the MFFC of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjDelete_rec( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    Hop_Obj_t * pFanin0, * pFanin1;
+    assert( !Hop_IsComplement(pObj) );
+    if ( Hop_ObjIsConst1(pObj) || Hop_ObjIsPi(pObj) )
+        return;
+    assert( Hop_ObjIsNode(pObj) );
+    pFanin0 = Hop_ObjFanin0(pObj);
+    pFanin1 = Hop_ObjFanin1(pObj);
+    Hop_ObjDelete( p, pObj );
+    if ( pFanin0 && !Hop_ObjIsNone(pFanin0) && Hop_ObjRefs(pFanin0) == 0 )
+        Hop_ObjDelete_rec( p, pFanin0 );
+    if ( pFanin1 && !Hop_ObjIsNone(pFanin1) && Hop_ObjRefs(pFanin1) == 0 )
+        Hop_ObjDelete_rec( p, pFanin1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the representative of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_ObjRepr( Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    if ( pObj->pData == NULL || pObj->pData == pObj )
+        return pObj;
+    return Hop_ObjRepr( pObj->pData );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets an equivalence relation between the nodes.]
+
+  Description [Makes the representative of pNew point to the representaive of pOld.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjCreateChoice( Hop_Obj_t * pOld, Hop_Obj_t * pNew )
+{
+    Hop_Obj_t * pOldRepr;
+    Hop_Obj_t * pNewRepr;
+    assert( pOld != NULL && pNew != NULL );
+    pOldRepr = Hop_ObjRepr(pOld);
+    pNewRepr = Hop_ObjRepr(pNew);
+    if ( pNewRepr != pOldRepr )
+        pNewRepr->pData = pOldRepr;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopOper.c b/abc70930/src/aig/hop/hopOper.c
new file mode 100644
index 00000000..a31ca0f2
--- /dev/null
+++ b/abc70930/src/aig/hop/hopOper.c
@@ -0,0 +1,373 @@
+/**CFile****************************************************************
+
+  FileName    [hopOper.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [AIG operations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopOper.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// procedure to detect an EXOR gate
+static inline int Hop_ObjIsExorType( Hop_Obj_t * p0, Hop_Obj_t * p1, Hop_Obj_t ** ppFan0, Hop_Obj_t ** ppFan1 )
+{
+    if ( !Hop_IsComplement(p0) || !Hop_IsComplement(p1) )
+        return 0;
+    p0 = Hop_Regular(p0);
+    p1 = Hop_Regular(p1);
+    if ( !Hop_ObjIsAnd(p0) || !Hop_ObjIsAnd(p1) )
+        return 0;
+    if ( Hop_ObjFanin0(p0) != Hop_ObjFanin0(p1) || Hop_ObjFanin1(p0) != Hop_ObjFanin1(p1) )
+        return 0;
+    if ( Hop_ObjFaninC0(p0) == Hop_ObjFaninC0(p1) || Hop_ObjFaninC1(p0) == Hop_ObjFaninC1(p1) )
+        return 0;
+    *ppFan0 = Hop_ObjChild0(p0);
+    *ppFan1 = Hop_ObjChild1(p0);
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns i-th elementary variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_IthVar( Hop_Man_t * p, int i )
+{
+    int v;
+    for ( v = Hop_ManPiNum(p); v <= i; v++ )
+        Hop_ObjCreatePi( p );
+    assert( i < Vec_PtrSize(p->vPis) );
+    return Hop_ManPi( p, i );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Perform one operation.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Oper( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1, Hop_Type_t Type )
+{
+    if ( Type == AIG_AND )
+        return Hop_And( p, p0, p1 );
+    if ( Type == AIG_EXOR )
+        return Hop_Exor( p, p0, p1 );
+    assert( 0 );
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_And( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 )
+{
+    Hop_Obj_t * pGhost, * pResult;
+//    Hop_Obj_t * pFan0, * pFan1;
+    // check trivial cases
+    if ( p0 == p1 )
+        return p0;
+    if ( p0 == Hop_Not(p1) )
+        return Hop_Not(p->pConst1);
+    if ( Hop_Regular(p0) == p->pConst1 )
+        return p0 == p->pConst1 ? p1 : Hop_Not(p->pConst1);
+    if ( Hop_Regular(p1) == p->pConst1 )
+        return p1 == p->pConst1 ? p0 : Hop_Not(p->pConst1);
+    // check if it can be an EXOR gate
+//    if ( Hop_ObjIsExorType( p0, p1, &pFan0, &pFan1 ) )
+//        return Hop_Exor( p, pFan0, pFan1 );
+    // check the table
+    pGhost = Hop_ObjCreateGhost( p, p0, p1, AIG_AND );
+    if ( pResult = Hop_TableLookup( p, pGhost ) )
+        return pResult;
+    return Hop_ObjCreate( p, pGhost );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Exor( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 )
+{
+/*
+    Hop_Obj_t * pGhost, * pResult;
+    // check trivial cases
+    if ( p0 == p1 )
+        return Hop_Not(p->pConst1);
+    if ( p0 == Hop_Not(p1) )
+        return p->pConst1;
+    if ( Hop_Regular(p0) == p->pConst1 )
+        return Hop_NotCond( p1, p0 == p->pConst1 );
+    if ( Hop_Regular(p1) == p->pConst1 )
+        return Hop_NotCond( p0, p1 == p->pConst1 );
+    // check the table
+    pGhost = Hop_ObjCreateGhost( p, p0, p1, AIG_EXOR );
+    if ( pResult = Hop_TableLookup( p, pGhost ) )
+        return pResult;
+    return Hop_ObjCreate( p, pGhost );
+*/
+    return Hop_Or( p, Hop_And(p, p0, Hop_Not(p1)), Hop_And(p, Hop_Not(p0), p1) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements Boolean OR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Or( Hop_Man_t * p, Hop_Obj_t * p0, Hop_Obj_t * p1 )
+{
+    return Hop_Not( Hop_And( p, Hop_Not(p0), Hop_Not(p1) ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Mux( Hop_Man_t * p, Hop_Obj_t * pC, Hop_Obj_t * p1, Hop_Obj_t * p0 )
+{
+/*    
+    Hop_Obj_t * pTempA1, * pTempA2, * pTempB1, * pTempB2, * pTemp;
+    int Count0, Count1;
+    // consider trivial cases
+    if ( p0 == Hop_Not(p1) )
+        return Hop_Exor( p, pC, p0 );
+    // other cases can be added
+    // implement the first MUX (F = C * x1 + C' * x0)
+
+    // check for constants here!!!
+
+    pTempA1 = Hop_TableLookup( p, Hop_ObjCreateGhost(p, pC,          p1, AIG_AND) );
+    pTempA2 = Hop_TableLookup( p, Hop_ObjCreateGhost(p, Hop_Not(pC), p0, AIG_AND) );
+    if ( pTempA1 && pTempA2 )
+    {
+        pTemp = Hop_TableLookup( p, Hop_ObjCreateGhost(p, Hop_Not(pTempA1), Hop_Not(pTempA2), AIG_AND) );
+        if ( pTemp ) return Hop_Not(pTemp);
+    }
+    Count0 = (pTempA1 != NULL) + (pTempA2 != NULL);
+    // implement the second MUX (F' = C * x1' + C' * x0')
+    pTempB1 = Hop_TableLookup( p, Hop_ObjCreateGhost(p, pC,          Hop_Not(p1), AIG_AND) );
+    pTempB2 = Hop_TableLookup( p, Hop_ObjCreateGhost(p, Hop_Not(pC), Hop_Not(p0), AIG_AND) );
+    if ( pTempB1 && pTempB2 )
+    {
+        pTemp = Hop_TableLookup( p, Hop_ObjCreateGhost(p, Hop_Not(pTempB1), Hop_Not(pTempB2), AIG_AND) );
+        if ( pTemp ) return pTemp;
+    }
+    Count1 = (pTempB1 != NULL) + (pTempB2 != NULL);
+    // compare and decide which one to implement
+    if ( Count0 >= Count1 )
+    {
+        pTempA1 = pTempA1? pTempA1 : Hop_And(p, pC,          p1);
+        pTempA2 = pTempA2? pTempA2 : Hop_And(p, Hop_Not(pC), p0);
+        return Hop_Or( p, pTempA1, pTempA2 );
+    }
+    pTempB1 = pTempB1? pTempB1 : Hop_And(p, pC,          Hop_Not(p1));
+    pTempB2 = pTempB2? pTempB2 : Hop_And(p, Hop_Not(pC), Hop_Not(p0));
+    return Hop_Not( Hop_Or( p, pTempB1, pTempB2 ) );
+*/
+    return Hop_Or( p, Hop_And(p, pC, p1), Hop_And(p, Hop_Not(pC), p0) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Maj( Hop_Man_t * p, Hop_Obj_t * pA, Hop_Obj_t * pB, Hop_Obj_t * pC )
+{
+    return Hop_Or( p, Hop_Or(p, Hop_And(p, pA, pB), Hop_And(p, pA, pC)), Hop_And(p, pB, pC) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs the well-balanced tree of gates.]
+
+  Description [Disregards levels and possible logic sharing.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Multi_rec( Hop_Man_t * p, Hop_Obj_t ** ppObjs, int nObjs, Hop_Type_t Type )
+{
+    Hop_Obj_t * pObj1, * pObj2;
+    if ( nObjs == 1 )
+        return ppObjs[0];
+    pObj1 = Hop_Multi_rec( p, ppObjs,           nObjs/2,         Type );
+    pObj2 = Hop_Multi_rec( p, ppObjs + nObjs/2, nObjs - nObjs/2, Type );
+    return Hop_Oper( p, pObj1, pObj2, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Old code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Multi( Hop_Man_t * p, Hop_Obj_t ** pArgs, int nArgs, Hop_Type_t Type )
+{
+    assert( Type == AIG_AND || Type == AIG_EXOR );
+    assert( nArgs > 0 );
+    return Hop_Multi_rec( p, pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_Miter( Hop_Man_t * p, Vec_Ptr_t * vPairs )
+{
+    int i;
+    assert( vPairs->nSize > 0 );
+    assert( vPairs->nSize % 2 == 0 );
+    // go through the cubes of the node's SOP
+    for ( i = 0; i < vPairs->nSize; i += 2 )
+        vPairs->pArray[i/2] = Hop_Not( Hop_Exor( p, vPairs->pArray[i], vPairs->pArray[i+1] ) );
+    vPairs->nSize = vPairs->nSize/2;
+    return Hop_Not( Hop_Multi_rec( p, (Hop_Obj_t **)vPairs->pArray, vPairs->nSize, AIG_AND ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_CreateAnd( Hop_Man_t * p, int nVars )
+{
+    Hop_Obj_t * pFunc;
+    int i;
+    pFunc = Hop_ManConst1( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Hop_And( p, pFunc, Hop_IthVar(p, i) );
+    return pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_CreateOr( Hop_Man_t * p, int nVars )
+{
+    Hop_Obj_t * pFunc;
+    int i;
+    pFunc = Hop_ManConst0( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Hop_Or( p, pFunc, Hop_IthVar(p, i) );
+    return pFunc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates AND function with nVars inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_CreateExor( Hop_Man_t * p, int nVars )
+{
+    Hop_Obj_t * pFunc;
+    int i;
+    pFunc = Hop_ManConst0( p );
+    for ( i = 0; i < nVars; i++ )
+        pFunc = Hop_Exor( p, pFunc, Hop_IthVar(p, i) );
+    return pFunc;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopTable.c b/abc70930/src/aig/hop/hopTable.c
new file mode 100644
index 00000000..76390054
--- /dev/null
+++ b/abc70930/src/aig/hop/hopTable.c
@@ -0,0 +1,262 @@
+/**CFile****************************************************************
+
+  FileName    [hopTable.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    [Structural hashing table.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006. ]
+
+  Revision    [$Id: hopTable.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// hashing the node
+static unsigned long Hop_Hash( Hop_Obj_t * pObj, int TableSize ) 
+{
+    unsigned long Key = Hop_ObjIsExor(pObj) * 1699;
+    Key ^= Hop_ObjFanin0(pObj)->Id * 7937;
+    Key ^= Hop_ObjFanin1(pObj)->Id * 2971;
+    Key ^= Hop_ObjFaninC0(pObj) * 911;
+    Key ^= Hop_ObjFaninC1(pObj) * 353;
+    return Key % TableSize;
+}
+
+// returns the place where this node is stored (or should be stored)
+static Hop_Obj_t ** Hop_TableFind( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    Hop_Obj_t ** ppEntry;
+    assert( Hop_ObjChild0(pObj) && Hop_ObjChild1(pObj) );
+    assert( Hop_ObjFanin0(pObj)->Id < Hop_ObjFanin1(pObj)->Id );
+    for ( ppEntry = p->pTable + Hop_Hash(pObj, p->nTableSize); *ppEntry; ppEntry = &(*ppEntry)->pNext )
+        if ( *ppEntry == pObj )
+            return ppEntry;
+    assert( *ppEntry == NULL );
+    return ppEntry;
+}
+
+static void         Hop_TableResize( Hop_Man_t * p );
+static unsigned int Cudd_PrimeAig( unsigned int  p );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+ 
+/**Function*************************************************************
+
+  Synopsis    [Checks if a node with the given attributes is in the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_TableLookup( Hop_Man_t * p, Hop_Obj_t * pGhost )
+{
+    Hop_Obj_t * pEntry;
+    assert( !Hop_IsComplement(pGhost) );
+    assert( Hop_ObjChild0(pGhost) && Hop_ObjChild1(pGhost) );
+    assert( Hop_ObjFanin0(pGhost)->Id < Hop_ObjFanin1(pGhost)->Id );
+    if ( p->fRefCount && (!Hop_ObjRefs(Hop_ObjFanin0(pGhost)) || !Hop_ObjRefs(Hop_ObjFanin1(pGhost))) )
+        return NULL;
+    for ( pEntry = p->pTable[Hop_Hash(pGhost, p->nTableSize)]; pEntry; pEntry = pEntry->pNext )
+    {
+        if ( Hop_ObjChild0(pEntry) == Hop_ObjChild0(pGhost) && 
+             Hop_ObjChild1(pEntry) == Hop_ObjChild1(pGhost) && 
+             Hop_ObjType(pEntry) == Hop_ObjType(pGhost) )
+            return pEntry;
+    }
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the new node to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_TableInsert( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    Hop_Obj_t ** ppPlace;
+    assert( !Hop_IsComplement(pObj) );
+    assert( Hop_TableLookup(p, pObj) == NULL );
+    if ( (pObj->Id & 0xFF) == 0 && 2 * p->nTableSize < Hop_ManNodeNum(p) )
+        Hop_TableResize( p );
+    ppPlace = Hop_TableFind( p, pObj );
+    assert( *ppPlace == NULL );
+    *ppPlace = pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node from the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_TableDelete( Hop_Man_t * p, Hop_Obj_t * pObj )
+{
+    Hop_Obj_t ** ppPlace;
+    assert( !Hop_IsComplement(pObj) );
+    ppPlace = Hop_TableFind( p, pObj );
+    assert( *ppPlace == pObj ); // node should be in the table
+    // remove the node
+    *ppPlace = pObj->pNext;
+    pObj->pNext = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of nodes in the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_TableCountEntries( Hop_Man_t * p )
+{
+    Hop_Obj_t * pEntry;
+    int i, Counter = 0;
+    for ( i = 0; i < p->nTableSize; i++ )
+        for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
+            Counter++;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Resizes the table.]
+
+  Description [Typically this procedure should not be called.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_TableResize( Hop_Man_t * p )
+{
+    Hop_Obj_t * pEntry, * pNext;
+    Hop_Obj_t ** pTableOld, ** ppPlace;
+    int nTableSizeOld, Counter, nEntries, i, clk;
+clk = clock();
+    // save the old table
+    pTableOld = p->pTable;
+    nTableSizeOld = p->nTableSize;
+    // get the new table
+    p->nTableSize = Cudd_PrimeAig( 2 * Hop_ManNodeNum(p) ); 
+    p->pTable = ALLOC( Hop_Obj_t *, p->nTableSize );
+    memset( p->pTable, 0, sizeof(Hop_Obj_t *) * p->nTableSize );
+    // rehash the entries from the old table
+    Counter = 0;
+    for ( i = 0; i < nTableSizeOld; i++ )
+    for ( pEntry = pTableOld[i], pNext = pEntry? pEntry->pNext : NULL; pEntry; pEntry = pNext, pNext = pEntry? pEntry->pNext : NULL )
+    {
+        // get the place where this entry goes in the table 
+        ppPlace = Hop_TableFind( p, pEntry );
+        assert( *ppPlace == NULL ); // should not be there
+        // add the entry to the list
+        *ppPlace = pEntry;
+        pEntry->pNext = NULL;
+        Counter++;
+    }
+    nEntries = Hop_ManNodeNum(p);
+    assert( Counter == nEntries );
+//    printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize );
+//    PRT( "Time", clock() - clk );
+    // replace the table and the parameters
+    free( pTableOld );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Profiles the hash table.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Hop_TableProfile( Hop_Man_t * p )
+{
+    Hop_Obj_t * pEntry;
+    int i, Counter;
+    for ( i = 0; i < p->nTableSize; i++ )
+    {
+        Counter = 0;
+        for ( pEntry = p->pTable[i]; pEntry; pEntry = pEntry->pNext )
+            Counter++;
+        if ( Counter ) 
+            printf( "%d ", Counter );
+    }
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Returns the next prime &gt;= p.]
+
+  Description [Copied from CUDD, for stand-aloneness.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+unsigned int Cudd_PrimeAig( unsigned int  p)
+{
+    int i,pn;
+    p--;
+    do {
+        p++;
+        if (p&1) {
+        pn = 1;
+        i = 3;
+        while ((unsigned) (i * i) <= p) {
+        if (p % i == 0) {
+            pn = 0;
+            break;
+        }
+        i += 2;
+        }
+    } else {
+        pn = 0;
+    }
+    } while (!pn);
+    return(p);
+
+} /* end of Cudd_Prime */
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hopUtil.c b/abc70930/src/aig/hop/hopUtil.c
new file mode 100644
index 00000000..87fdb15e
--- /dev/null
+++ b/abc70930/src/aig/hop/hopUtil.c
@@ -0,0 +1,572 @@
+/**CFile****************************************************************
+
+  FileName    [hopUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Various procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: hopUtil.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Increments the current traversal ID of the network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManIncrementTravId( Hop_Man_t * p )
+{
+    if ( p->nTravIds >= (1<<30)-1 )
+        Hop_ManCleanData( p );
+    p->nTravIds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans the data pointers for the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManCleanData( Hop_Man_t * p )
+{
+    Hop_Obj_t * pObj;
+    int i;
+    p->nTravIds = 1;
+    Hop_ManConst1(p)->pData = NULL;
+    Hop_ManForEachPi( p, pObj, i )
+        pObj->pData = NULL;
+    Hop_ManForEachPo( p, pObj, i )
+        pObj->pData = NULL;
+    Hop_ManForEachNode( p, pObj, i )
+        pObj->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively cleans the data pointers in the cone of the node.]
+
+  Description [Applicable to small AIGs only because no caching is performed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjCleanData_rec( Hop_Obj_t * pObj )
+{
+    assert( !Hop_IsComplement(pObj) );
+    assert( !Hop_ObjIsPo(pObj) );
+    if ( Hop_ObjIsAnd(pObj) )
+    {
+        Hop_ObjCleanData_rec( Hop_ObjFanin0(pObj) );
+        Hop_ObjCleanData_rec( Hop_ObjFanin1(pObj) );
+    }
+    pObj->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Detects multi-input gate rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjCollectMulti_rec( Hop_Obj_t * pRoot, Hop_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    if ( pRoot != pObj && (Hop_IsComplement(pObj) || Hop_ObjIsPi(pObj) || Hop_ObjType(pRoot) != Hop_ObjType(pObj)) )
+    {
+        Vec_PtrPushUnique(vSuper, pObj);
+        return;
+    }
+    Hop_ObjCollectMulti_rec( pRoot, Hop_ObjChild0(pObj), vSuper );
+    Hop_ObjCollectMulti_rec( pRoot, Hop_ObjChild1(pObj), vSuper );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Detects multi-input gate rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjCollectMulti( Hop_Obj_t * pRoot, Vec_Ptr_t * vSuper )
+{
+    assert( !Hop_IsComplement(pRoot) );
+    Vec_PtrClear( vSuper );
+    Hop_ObjCollectMulti_rec( pRoot, pRoot, vSuper );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the node is the root of MUX or EXOR/NEXOR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ObjIsMuxType( Hop_Obj_t * pNode )
+{
+    Hop_Obj_t * pNode0, * pNode1;
+    // check that the node is regular
+    assert( !Hop_IsComplement(pNode) );
+    // if the node is not AND, this is not MUX
+    if ( !Hop_ObjIsAnd(pNode) )
+        return 0;
+    // if the children are not complemented, this is not MUX
+    if ( !Hop_ObjFaninC0(pNode) || !Hop_ObjFaninC1(pNode) )
+        return 0;
+    // get children
+    pNode0 = Hop_ObjFanin0(pNode);
+    pNode1 = Hop_ObjFanin1(pNode);
+    // if the children are not ANDs, this is not MUX
+    if ( !Hop_ObjIsAnd(pNode0) || !Hop_ObjIsAnd(pNode1) )
+        return 0;
+    // otherwise the node is MUX iff it has a pair of equal grandchildren
+    return (Hop_ObjFanin0(pNode0) == Hop_ObjFanin0(pNode1) && (Hop_ObjFaninC0(pNode0) ^ Hop_ObjFaninC0(pNode1))) || 
+           (Hop_ObjFanin0(pNode0) == Hop_ObjFanin1(pNode1) && (Hop_ObjFaninC0(pNode0) ^ Hop_ObjFaninC1(pNode1))) ||
+           (Hop_ObjFanin1(pNode0) == Hop_ObjFanin0(pNode1) && (Hop_ObjFaninC1(pNode0) ^ Hop_ObjFaninC0(pNode1))) ||
+           (Hop_ObjFanin1(pNode0) == Hop_ObjFanin1(pNode1) && (Hop_ObjFaninC1(pNode0) ^ Hop_ObjFaninC1(pNode1)));
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Recognizes what nodes are inputs of the EXOR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Hop_ObjRecognizeExor( Hop_Obj_t * pObj, Hop_Obj_t ** ppFan0, Hop_Obj_t ** ppFan1 )
+{
+    Hop_Obj_t * p0, * p1;
+    assert( !Hop_IsComplement(pObj) );
+    if ( !Hop_ObjIsNode(pObj) )
+        return 0;
+    if ( Hop_ObjIsExor(pObj) )
+    {
+        *ppFan0 = Hop_ObjChild0(pObj);
+        *ppFan1 = Hop_ObjChild1(pObj);
+        return 1;
+    }
+    assert( Hop_ObjIsAnd(pObj) );
+    p0 = Hop_ObjChild0(pObj);
+    p1 = Hop_ObjChild1(pObj);
+    if ( !Hop_IsComplement(p0) || !Hop_IsComplement(p1) )
+        return 0;
+    p0 = Hop_Regular(p0);
+    p1 = Hop_Regular(p1);
+    if ( !Hop_ObjIsAnd(p0) || !Hop_ObjIsAnd(p1) )
+        return 0;
+    if ( Hop_ObjFanin0(p0) != Hop_ObjFanin0(p1) || Hop_ObjFanin1(p0) != Hop_ObjFanin1(p1) )
+        return 0;
+    if ( Hop_ObjFaninC0(p0) == Hop_ObjFaninC0(p1) || Hop_ObjFaninC1(p0) == Hop_ObjFaninC1(p1) )
+        return 0;
+    *ppFan0 = Hop_ObjChild0(p0);
+    *ppFan1 = Hop_ObjChild1(p0);
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recognizes what nodes are control and data inputs of a MUX.]
+
+  Description [If the node is a MUX, returns the control variable C.
+  Assigns nodes T and E to be the then and else variables of the MUX. 
+  Node C is never complemented. Nodes T and E can be complemented.
+  This function also recognizes EXOR/NEXOR gates as MUXes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Hop_ObjRecognizeMux( Hop_Obj_t * pNode, Hop_Obj_t ** ppNodeT, Hop_Obj_t ** ppNodeE )
+{
+    Hop_Obj_t * pNode0, * pNode1;
+    assert( !Hop_IsComplement(pNode) );
+    assert( Hop_ObjIsMuxType(pNode) );
+    // get children
+    pNode0 = Hop_ObjFanin0(pNode);
+    pNode1 = Hop_ObjFanin1(pNode);
+
+    // find the control variable
+    if ( Hop_ObjFanin1(pNode0) == Hop_ObjFanin1(pNode1) && (Hop_ObjFaninC1(pNode0) ^ Hop_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Hop_ObjFaninC1(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Hop_Not(Hop_ObjChild0(pNode0));//pNode1->p1);
+            return Hop_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Hop_Not(Hop_ObjChild0(pNode1));//pNode2->p1);
+            return Hop_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+    else if ( Hop_ObjFanin0(pNode0) == Hop_ObjFanin0(pNode1) && (Hop_ObjFaninC0(pNode0) ^ Hop_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Hop_ObjFaninC0(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Hop_Not(Hop_ObjChild1(pNode0));//pNode1->p2);
+            return Hop_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Hop_Not(Hop_ObjChild1(pNode1));//pNode2->p2);
+            return Hop_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+    else if ( Hop_ObjFanin0(pNode0) == Hop_ObjFanin1(pNode1) && (Hop_ObjFaninC0(pNode0) ^ Hop_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Hop_ObjFaninC0(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Hop_Not(Hop_ObjChild1(pNode0));//pNode1->p2);
+            return Hop_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Hop_Not(Hop_ObjChild0(pNode1));//pNode2->p1);
+            return Hop_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+    else if ( Hop_ObjFanin1(pNode0) == Hop_ObjFanin0(pNode1) && (Hop_ObjFaninC1(pNode0) ^ Hop_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Hop_ObjFaninC1(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Hop_Not(Hop_ObjChild0(pNode0));//pNode1->p1);
+            return Hop_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Hop_Not(Hop_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Hop_Not(Hop_ObjChild1(pNode1));//pNode2->p2);
+            return Hop_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+    assert( 0 ); // this is not MUX
+    return NULL;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints Eqn formula for the AIG rooted at this node.]
+
+  Description [The formula is in terms of PIs, which should have
+  their names assigned in pObj->pData fields.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjPrintEqn( FILE * pFile, Hop_Obj_t * pObj, Vec_Vec_t * vLevels, int Level )
+{
+    Vec_Ptr_t * vSuper;
+    Hop_Obj_t * pFanin;
+    int fCompl, i;
+    // store the complemented attribute
+    fCompl = Hop_IsComplement(pObj);
+    pObj = Hop_Regular(pObj);
+    // constant case
+    if ( Hop_ObjIsConst1(pObj) )
+    {
+        fprintf( pFile, "%d", !fCompl );
+        return;
+    }
+    // PI case
+    if ( Hop_ObjIsPi(pObj) )
+    {
+        fprintf( pFile, "%s%s", fCompl? "!" : "", pObj->pData );
+        return;
+    }
+    // AND case
+    Vec_VecExpand( vLevels, Level );
+    vSuper = Vec_VecEntry(vLevels, Level);
+    Hop_ObjCollectMulti( pObj, vSuper );
+    fprintf( pFile, "%s", (Level==0? "" : "(") );
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        Hop_ObjPrintEqn( pFile, Hop_NotCond(pFanin, fCompl), vLevels, Level+1 );
+        if ( i < Vec_PtrSize(vSuper) - 1 )
+            fprintf( pFile, " %s ", fCompl? "+" : "*" );
+    }
+    fprintf( pFile, "%s", (Level==0? "" : ")") );
+    return;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints Verilog formula for the AIG rooted at this node.]
+
+  Description [The formula is in terms of PIs, which should have
+  their names assigned in pObj->pData fields.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjPrintVerilog( FILE * pFile, Hop_Obj_t * pObj, Vec_Vec_t * vLevels, int Level )
+{
+    Vec_Ptr_t * vSuper;
+    Hop_Obj_t * pFanin, * pFanin0, * pFanin1, * pFaninC;
+    int fCompl, i;
+    // store the complemented attribute
+    fCompl = Hop_IsComplement(pObj);
+    pObj = Hop_Regular(pObj);
+    // constant case
+    if ( Hop_ObjIsConst1(pObj) )
+    {
+        fprintf( pFile, "1\'b%d", !fCompl );
+        return;
+    }
+    // PI case
+    if ( Hop_ObjIsPi(pObj) )
+    {
+        fprintf( pFile, "%s%s", fCompl? "~" : "", pObj->pData );
+        return;
+    }
+    // EXOR case
+    if ( Hop_ObjIsExor(pObj) )
+    {
+        Vec_VecExpand( vLevels, Level );
+        vSuper = Vec_VecEntry( vLevels, Level );
+        Hop_ObjCollectMulti( pObj, vSuper );
+        fprintf( pFile, "%s", (Level==0? "" : "(") );
+        Vec_PtrForEachEntry( vSuper, pFanin, i )
+        {
+            Hop_ObjPrintVerilog( pFile, Hop_NotCond(pFanin, (fCompl && i==0)), vLevels, Level+1 );
+            if ( i < Vec_PtrSize(vSuper) - 1 )
+                fprintf( pFile, " ^ " );
+        }
+        fprintf( pFile, "%s", (Level==0? "" : ")") );
+        return;
+    }
+    // MUX case
+    if ( Hop_ObjIsMuxType(pObj) )
+    {
+        if ( Hop_ObjRecognizeExor( pObj, &pFanin0, &pFanin1 ) )
+        {
+            fprintf( pFile, "%s", (Level==0? "" : "(") );
+            Hop_ObjPrintVerilog( pFile, Hop_NotCond(pFanin0, fCompl), vLevels, Level+1 );
+            fprintf( pFile, " ^ " );
+            Hop_ObjPrintVerilog( pFile, pFanin1, vLevels, Level+1 );
+            fprintf( pFile, "%s", (Level==0? "" : ")") );
+        }
+        else 
+        {
+            pFaninC = Hop_ObjRecognizeMux( pObj, &pFanin1, &pFanin0 );
+            fprintf( pFile, "%s", (Level==0? "" : "(") );
+            Hop_ObjPrintVerilog( pFile, pFaninC, vLevels, Level+1 );
+            fprintf( pFile, " ? " );
+            Hop_ObjPrintVerilog( pFile, Hop_NotCond(pFanin1, fCompl), vLevels, Level+1 );
+            fprintf( pFile, " : " );
+            Hop_ObjPrintVerilog( pFile, Hop_NotCond(pFanin0, fCompl), vLevels, Level+1 );
+            fprintf( pFile, "%s", (Level==0? "" : ")") );
+        }
+        return;
+    }
+    // AND case
+    Vec_VecExpand( vLevels, Level );
+    vSuper = Vec_VecEntry(vLevels, Level);
+    Hop_ObjCollectMulti( pObj, vSuper );
+    fprintf( pFile, "%s", (Level==0? "" : "(") );
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        Hop_ObjPrintVerilog( pFile, Hop_NotCond(pFanin, fCompl), vLevels, Level+1 );
+        if ( i < Vec_PtrSize(vSuper) - 1 )
+            fprintf( pFile, " %s ", fCompl? "|" : "&" );
+    }
+    fprintf( pFile, "%s", (Level==0? "" : ")") );
+    return;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ObjPrintVerbose( Hop_Obj_t * pObj, int fHaig )
+{
+    assert( !Hop_IsComplement(pObj) );
+    printf( "Node %p : ", pObj );
+    if ( Hop_ObjIsConst1(pObj) )
+        printf( "constant 1" );
+    else if ( Hop_ObjIsPi(pObj) )
+        printf( "PI" );
+    else
+        printf( "AND( %p%s, %p%s )", 
+            Hop_ObjFanin0(pObj), (Hop_ObjFaninC0(pObj)? "\'" : " "), 
+            Hop_ObjFanin1(pObj), (Hop_ObjFaninC1(pObj)? "\'" : " ") );
+    printf( " (refs = %3d)", Hop_ObjRefs(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManPrintVerbose( Hop_Man_t * p, int fHaig )
+{
+    Vec_Ptr_t * vNodes;
+    Hop_Obj_t * pObj;
+    int i;
+    printf( "PIs: " );
+    Hop_ManForEachPi( p, pObj, i )
+        printf( " %p", pObj );
+    printf( "\n" );
+    vNodes = Hop_ManDfs( p );
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Hop_ObjPrintVerbose( pObj, fHaig ), printf( "\n" );
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the AIG into the BLIF file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Hop_ManDumpBlif( Hop_Man_t * p, char * pFileName )
+{
+    FILE * pFile;
+    Vec_Ptr_t * vNodes;
+    Hop_Obj_t * pObj, * pConst1 = NULL;
+    int i, nDigits, Counter = 0;
+    if ( Hop_ManPoNum(p) == 0 )
+    {
+        printf( "Hop_ManDumpBlif(): AIG manager does not have POs.\n" );
+        return;
+    }
+    // collect nodes in the DFS order
+    vNodes = Hop_ManDfs( p );
+    // assign IDs to objects
+    Hop_ManConst1(p)->pData = (void *)Counter++;
+    Hop_ManForEachPi( p, pObj, i )
+        pObj->pData = (void *)Counter++;
+    Hop_ManForEachPo( p, pObj, i )
+        pObj->pData = (void *)Counter++;
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        pObj->pData = (void *)Counter++;
+    nDigits = Hop_Base10Log( Counter );
+    // write the file
+    pFile = fopen( pFileName, "w" );
+    fprintf( pFile, "# BLIF file written by procedure Hop_ManDumpBlif() in ABC\n" );
+    fprintf( pFile, "# http://www.eecs.berkeley.edu/~alanmi/abc/\n" );
+    fprintf( pFile, ".model test\n" );
+    // write PIs
+    fprintf( pFile, ".inputs" );
+    Hop_ManForEachPi( p, pObj, i )
+        fprintf( pFile, " n%0*d", nDigits, (int)pObj->pData );
+    fprintf( pFile, "\n" );
+    // write POs
+    fprintf( pFile, ".outputs" );
+    Hop_ManForEachPo( p, pObj, i )
+        fprintf( pFile, " n%0*d", nDigits, (int)pObj->pData );
+    fprintf( pFile, "\n" );
+    // write nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        fprintf( pFile, ".names n%0*d n%0*d n%0*d\n", 
+            nDigits, (int)Hop_ObjFanin0(pObj)->pData, 
+            nDigits, (int)Hop_ObjFanin1(pObj)->pData, 
+            nDigits, (int)pObj->pData );
+        fprintf( pFile, "%d%d 1\n", !Hop_ObjFaninC0(pObj), !Hop_ObjFaninC1(pObj) );
+    }
+    // write POs
+    Hop_ManForEachPo( p, pObj, i )
+    {
+        fprintf( pFile, ".names n%0*d n%0*d\n", 
+            nDigits, (int)Hop_ObjFanin0(pObj)->pData, 
+            nDigits, (int)pObj->pData );
+        fprintf( pFile, "%d 1\n", !Hop_ObjFaninC0(pObj) );
+        if ( Hop_ObjIsConst1(Hop_ObjFanin0(pObj)) )
+            pConst1 = Hop_ManConst1(p);
+    }
+    if ( pConst1 )
+        fprintf( pFile, ".names n%0*d\n 1\n", nDigits, (int)pConst1->pData );
+    fprintf( pFile, ".end\n\n" );
+    fclose( pFile );
+    Vec_PtrFree( vNodes );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/hop_.c b/abc70930/src/aig/hop/hop_.c
new file mode 100644
index 00000000..468413fa
--- /dev/null
+++ b/abc70930/src/aig/hop/hop_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [ivy_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Minimalistic And-Inverter Graph package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivy_.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/hop/module.make b/abc70930/src/aig/hop/module.make
new file mode 100644
index 00000000..b06d91fd
--- /dev/null
+++ b/abc70930/src/aig/hop/module.make
@@ -0,0 +1,9 @@
+SRC +=    src/aig/hop/hopBalance.c \
+    src/aig/hop/hopCheck.c \
+    src/aig/hop/hopDfs.c \
+    src/aig/hop/hopMan.c \
+    src/aig/hop/hopMem.c \
+    src/aig/hop/hopObj.c \
+    src/aig/hop/hopOper.c \
+    src/aig/hop/hopTable.c \
+    src/aig/hop/hopUtil.c 
diff --git a/abc70930/src/aig/ioa/ioa.h b/abc70930/src/aig/ioa/ioa.h
new file mode 100644
index 00000000..3458d12e
--- /dev/null
+++ b/abc70930/src/aig/ioa/ioa.h
@@ -0,0 +1,80 @@
+/**CFile****************************************************************
+
+  FileName    [ioa.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [AIG package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - April 28, 2007.]
+
+  Revision    [$Id: ioa.h,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __IOA_H__
+#define __IOA_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+
+#include "vec.h"
+#include "bar.h"
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== ioaReadAig.c ========================================================*/
+extern Aig_Man_t *    Ioa_ReadAiger( char * pFileName, int fCheck );
+/*=== ioaWriteAig.c =======================================================*/
+extern void           Ioa_WriteAiger( Aig_Man_t * pMan, char * pFileName, int fWriteSymbols );
+/*=== ioaUtil.c =======================================================*/
+extern int            Ioa_FileSize( char * pFileName );
+extern char *         Ioa_FileNameGeneric( char * FileName );
+extern char *         Ioa_TimeStamp();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/ioa/ioaReadAig.c b/abc70930/src/aig/ioa/ioaReadAig.c
new file mode 100644
index 00000000..937e446f
--- /dev/null
+++ b/abc70930/src/aig/ioa/ioaReadAig.c
@@ -0,0 +1,312 @@
+/**CFile****************************************************************
+
+  FileName    [ioaReadAiger.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Command processing package.]
+
+  Synopsis    [Procedures to read binary AIGER format developed by
+  Armin Biere, Johannes Kepler University (http://fmv.jku.at/)]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - December 16, 2006.]
+
+  Revision    [$Id: ioaReadAiger.c,v 1.00 2006/12/16 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ioa.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+unsigned Ioa_ReadAigerDecode( char ** ppPos );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Reads the AIG in the binary AIGER format.]
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Man_t * Ioa_ReadAiger( char * pFileName, int fCheck )
+{
+    Bar_Progress_t * pProgress;
+    FILE * pFile;
+    Vec_Ptr_t * vNodes, * vDrivers;//, * vTerms;
+    Aig_Obj_t * pObj, * pNode0, * pNode1;
+    Aig_Man_t * pManNew;
+    int nTotal, nInputs, nOutputs, nLatches, nAnds, nFileSize, i;//, iTerm, nDigits;
+    char * pContents, * pDrivers, * pSymbols, * pCur, * pName;//, * pType;
+    unsigned uLit0, uLit1, uLit;
+
+    // read the file into the buffer
+    nFileSize = Ioa_FileSize( pFileName );
+    pFile = fopen( pFileName, "rb" );
+    pContents = ALLOC( char, nFileSize );
+    fread( pContents, nFileSize, 1, pFile );
+    fclose( pFile );
+
+    // check if the input file format is correct
+    if ( strncmp(pContents, "aig", 3) != 0 )
+    {
+        fprintf( stdout, "Wrong input file format.\n" );
+        return NULL;
+    }
+
+    // read the file type
+    pCur = pContents;         while ( *pCur++ != ' ' );
+    // read the number of objects
+    nTotal = atoi( pCur );    while ( *pCur++ != ' ' );
+    // read the number of inputs
+    nInputs = atoi( pCur );   while ( *pCur++ != ' ' );
+    // read the number of latches
+    nLatches = atoi( pCur );  while ( *pCur++ != ' ' );
+    // read the number of outputs
+    nOutputs = atoi( pCur );  while ( *pCur++ != ' ' );
+    // read the number of nodes
+    nAnds = atoi( pCur );     while ( *pCur++ != '\n' );  
+    // check the parameters
+    if ( nTotal != nInputs + nLatches + nAnds )
+    {
+        fprintf( stdout, "The paramters are wrong.\n" );
+        return NULL;
+    }
+
+    // allocate the empty AIG
+    pManNew = Aig_ManStart( nAnds );
+    pName = Ioa_FileNameGeneric( pFileName );
+    pManNew->pName = Aig_UtilStrsav( pName );
+//    pManNew->pSpec = Ioa_UtilStrsav( pFileName );
+    free( pName );
+
+    // prepare the array of nodes
+    vNodes = Vec_PtrAlloc( 1 + nInputs + nLatches + nAnds );
+    Vec_PtrPush( vNodes, Aig_ManConst0(pManNew) );
+
+    // create the PIs
+    for ( i = 0; i < nInputs + nLatches; i++ )
+    {
+        pObj = Aig_ObjCreatePi(pManNew);    
+        Vec_PtrPush( vNodes, pObj );
+    }
+/*
+    // create the POs
+    for ( i = 0; i < nOutputs + nLatches; i++ )
+    {
+        pObj = Aig_ObjCreatePo(pManNew);   
+    }
+*/
+    // create the latches
+    pManNew->nRegs = nLatches;
+/*
+    nDigits = Ioa_Base10Log( nLatches );
+    for ( i = 0; i < nLatches; i++ )
+    {
+        pObj = Aig_ObjCreateLatch(pManNew);
+        Aig_LatchSetInit0( pObj );
+        pNode0 = Aig_ObjCreateBi(pManNew);
+        pNode1 = Aig_ObjCreateBo(pManNew);
+        Aig_ObjAddFanin( pObj, pNode0 );
+        Aig_ObjAddFanin( pNode1, pObj );
+        Vec_PtrPush( vNodes, pNode1 );
+        // assign names to latch and its input
+//        Aig_ObjAssignName( pObj, Aig_ObjNameDummy("_L", i, nDigits), NULL );
+//        printf( "Creating latch %s with input %d and output %d.\n", Aig_ObjName(pObj), pNode0->Id, pNode1->Id );
+    } 
+*/
+    
+    // remember the beginning of latch/PO literals
+    pDrivers = pCur;
+
+    // scroll to the beginning of the binary data
+    for ( i = 0; i < nLatches + nOutputs; )
+        if ( *pCur++ == '\n' )
+            i++;
+
+    // create the AND gates
+    pProgress = Bar_ProgressStart( stdout, nAnds );
+    for ( i = 0; i < nAnds; i++ )
+    {
+        Bar_ProgressUpdate( pProgress, i, NULL );
+        uLit = ((i + 1 + nInputs + nLatches) << 1);
+        uLit1 = uLit  - Ioa_ReadAigerDecode( &pCur );
+        uLit0 = uLit1 - Ioa_ReadAigerDecode( &pCur );
+//        assert( uLit1 > uLit0 );
+        pNode0 = Aig_NotCond( Vec_PtrEntry(vNodes, uLit0 >> 1), uLit0 & 1 );
+        pNode1 = Aig_NotCond( Vec_PtrEntry(vNodes, uLit1 >> 1), uLit1 & 1 );
+        assert( Vec_PtrSize(vNodes) == i + 1 + nInputs + nLatches );
+        Vec_PtrPush( vNodes, Aig_And(pManNew, pNode0, pNode1) );
+    }
+    Bar_ProgressStop( pProgress );
+
+    // remember the place where symbols begin
+    pSymbols = pCur;
+
+    // read the latch driver literals
+    vDrivers = Vec_PtrAlloc( nLatches + nOutputs );
+    pCur = pDrivers;
+//    Aig_ManForEachLatchInput( pManNew, pObj, i )
+    for ( i = 0; i < nLatches; i++ )
+    {
+        uLit0 = atoi( pCur );  while ( *pCur++ != '\n' );
+        pNode0 = Aig_NotCond( Vec_PtrEntry(vNodes, uLit0 >> 1), (uLit0 & 1) );//^ (uLit0 < 2) );
+//        Aig_ObjAddFanin( pObj, pNode0 );
+        Vec_PtrPush( vDrivers, pNode0 );
+    }
+    // read the PO driver literals
+//    Aig_ManForEachPo( pManNew, pObj, i )
+    for ( i = 0; i < nOutputs; i++ )
+    {
+        uLit0 = atoi( pCur );  while ( *pCur++ != '\n' );
+        pNode0 = Aig_NotCond( Vec_PtrEntry(vNodes, uLit0 >> 1), (uLit0 & 1) );//^ (uLit0 < 2) );
+//        Aig_ObjAddFanin( pObj, pNode0 );
+        Vec_PtrPush( vDrivers, pNode0 );
+    }
+
+
+    // create the POs
+    for ( i = 0; i < nOutputs; i++ )
+        Aig_ObjCreatePo( pManNew, Vec_PtrEntry(vDrivers, nLatches + i) );
+    for ( i = 0; i < nLatches; i++ )
+        Aig_ObjCreatePo( pManNew, Vec_PtrEntry(vDrivers, i) );
+    Vec_PtrFree( vDrivers );
+
+/*
+    // read the names if present
+    pCur = pSymbols;
+    if ( *pCur != 'c' )
+    {
+        int Counter = 0;
+        while ( pCur < pContents + nFileSize && *pCur != 'c' )
+        {
+            // get the terminal type
+            pType = pCur;
+            if ( *pCur == 'i' )
+                vTerms = pManNew->vPis;
+            else if ( *pCur == 'l' )
+                vTerms = pManNew->vBoxes;
+            else if ( *pCur == 'o' )
+                vTerms = pManNew->vPos;
+            else
+            {
+                fprintf( stdout, "Wrong terminal type.\n" );
+                return NULL;
+            }
+            // get the terminal number
+            iTerm = atoi( ++pCur );  while ( *pCur++ != ' ' );
+            // get the node
+            if ( iTerm >= Vec_PtrSize(vTerms) )
+            {
+                fprintf( stdout, "The number of terminal is out of bound.\n" );
+                return NULL;
+            }
+            pObj = Vec_PtrEntry( vTerms, iTerm );
+            if ( *pType == 'l' )
+                pObj = Aig_ObjFanout0(pObj);
+            // assign the name
+            pName = pCur;          while ( *pCur++ != '\n' );
+            // assign this name 
+            *(pCur-1) = 0;
+            Aig_ObjAssignName( pObj, pName, NULL );
+            if ( *pType == 'l' )
+            {
+                Aig_ObjAssignName( Aig_ObjFanin0(pObj), Aig_ObjName(pObj), "L" );
+                Aig_ObjAssignName( Aig_ObjFanin0(Aig_ObjFanin0(pObj)), Aig_ObjName(pObj), "_in" );
+            }
+            // mark the node as named
+            pObj->pCopy = (Aig_Obj_t *)Aig_ObjName(pObj);
+        } 
+
+        // assign the remaining names
+        Aig_ManForEachPi( pManNew, pObj, i )
+        {
+            if ( pObj->pCopy ) continue;
+            Aig_ObjAssignName( pObj, Aig_ObjName(pObj), NULL );
+            Counter++;
+        }
+        Aig_ManForEachLatchOutput( pManNew, pObj, i )
+        {
+            if ( pObj->pCopy ) continue;
+            Aig_ObjAssignName( pObj, Aig_ObjName(pObj), NULL );
+            Aig_ObjAssignName( Aig_ObjFanin0(pObj), Aig_ObjName(pObj), "L" );
+            Aig_ObjAssignName( Aig_ObjFanin0(Aig_ObjFanin0(pObj)), Aig_ObjName(pObj), "_in" );
+            Counter++;
+        }
+        Aig_ManForEachPo( pManNew, pObj, i )
+        {
+            if ( pObj->pCopy ) continue;
+            Aig_ObjAssignName( pObj, Aig_ObjName(pObj), NULL );
+            Counter++;
+        }
+        if ( Counter )
+            printf( "Ioa_ReadAiger(): Added %d default names for nameless I/O/register objects.\n", Counter );
+    }
+    else
+    {
+//        printf( "Ioa_ReadAiger(): I/O/register names are not given. Generating short names.\n" );
+        Aig_ManShortNames( pManNew );
+    }
+*/
+
+    // skipping the comments
+    free( pContents );
+    Vec_PtrFree( vNodes );
+
+    // remove the extra nodes
+    Aig_ManCleanup( pManNew );
+
+    // check the result
+    if ( fCheck && !Aig_ManCheck( pManNew ) )
+    {
+        printf( "Ioa_ReadAiger: The network check has failed.\n" );
+        Aig_ManStop( pManNew );
+        return NULL;
+    }
+    return pManNew;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Extracts one unsigned AIG edge from the input buffer.]
+
+  Description [This procedure is a slightly modified version of Armin Biere's
+  procedure "unsigned decode (FILE * file)". ]
+  
+  SideEffects [Updates the current reading position.]
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ioa_ReadAigerDecode( char ** ppPos )
+{
+    unsigned x = 0, i = 0;
+    unsigned char ch;
+
+//    while ((ch = getnoneofch (file)) & 0x80)
+    while ((ch = *(*ppPos)++) & 0x80)
+        x |= (ch & 0x7f) << (7 * i++);
+
+    return x | (ch << (7 * i));
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ioa/ioaUtil.c b/abc70930/src/aig/ioa/ioaUtil.c
new file mode 100644
index 00000000..79dcca1e
--- /dev/null
+++ b/abc70930/src/aig/ioa/ioaUtil.c
@@ -0,0 +1,117 @@
+/**CFile****************************************************************
+
+  FileName    [ioaUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Command processing package.]
+
+  Synopsis    [Procedures to read binary AIGER format developed by
+  Armin Biere, Johannes Kepler University (http://fmv.jku.at/)]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - December 16, 2006.]
+
+  Revision    [$Id: ioaUtil.c,v 1.00 2006/12/16 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ioa.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the file size.]
+
+  Description [The file should be closed.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ioa_FileSize( char * pFileName )
+{
+    FILE * pFile;
+    int nFileSize;
+    pFile = fopen( pFileName, "r" );
+    if ( pFile == NULL )
+    {
+        printf( "Ioa_FileSize(): The file is unavailable (absent or open).\n" );
+        return 0;
+    }
+    fseek( pFile, 0, SEEK_END );  
+    nFileSize = ftell( pFile ); 
+    fclose( pFile );
+    return nFileSize;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Ioa_FileNameGeneric( char * FileName )
+{
+    char * pDot;
+    char * pUnd;
+    char * pRes;
+    
+    // find the generic name of the file
+    pRes = Aig_UtilStrsav( FileName );
+    // find the pointer to the "." symbol in the file name
+//  pUnd = strstr( FileName, "_" );
+    pUnd = NULL;
+    pDot = strstr( FileName, "." );
+    if ( pUnd )
+        pRes[pUnd - FileName] = 0;
+    else if ( pDot )
+        pRes[pDot - FileName] = 0;
+    return pRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the time stamp.]
+
+  Description [The file should be closed.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Ioa_TimeStamp()
+{
+    static char Buffer[100];
+    char * TimeStamp;
+    time_t ltime;
+    // get the current time
+    time( &ltime );
+    TimeStamp = asctime( localtime( &ltime ) );
+    TimeStamp[ strlen(TimeStamp) - 1 ] = 0;
+    strcpy( Buffer, TimeStamp );
+    return Buffer;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ioa/ioaWriteAig.c b/abc70930/src/aig/ioa/ioaWriteAig.c
new file mode 100644
index 00000000..a6c23fd4
--- /dev/null
+++ b/abc70930/src/aig/ioa/ioaWriteAig.c
@@ -0,0 +1,292 @@
+/**CFile****************************************************************
+
+  FileName    [ioaWriteAiger.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Command processing package.]
+
+  Synopsis    [Procedures to write binary AIGER format developed by
+  Armin Biere, Johannes Kepler University (http://fmv.jku.at/)]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - December 16, 2006.]
+
+  Revision    [$Id: ioaWriteAiger.c,v 1.00 2006/12/16 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ioa.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+/*
+    The following is taken from the AIGER format description, 
+    which can be found at http://fmv.jku.at/aiger
+*/
+
+
+/*
+         The AIGER And-Inverter Graph (AIG) Format Version 20061129
+         ----------------------------------------------------------
+              Armin Biere, Johannes Kepler University, 2006
+
+  This report describes the AIG file format as used by the AIGER library.
+  The purpose of this report is not only to motivate and document the
+  format, but also to allow independent implementations of writers and
+  readers by giving precise and unambiguous definitions.
+
+  ...
+
+Introduction
+
+  The name AIGER contains as one part the acronym AIG of And-Inverter
+  Graphs and also if pronounced in German sounds like the name of the
+  'Eiger', a mountain in the Swiss alps.  This choice should emphasize the
+  origin of this format. It was first openly discussed at the Alpine
+  Verification Meeting 2006 in Ascona as a way to provide a simple, compact
+  file format for a model checking competition affiliated to CAV 2007.
+
+  ...
+
+Binary Format Definition
+
+  The binary format is semantically a subset of the ASCII format with a
+  slightly different syntax.  The binary format may need to reencode
+  literals, but translating a file in binary format into ASCII format and
+  then back in to binary format will result in the same file.
+
+  The main differences of the binary format to the ASCII format are as
+  follows.  After the header the list of input literals and all the
+  current state literals of a latch can be omitted.  Furthermore the
+  definitions of the AND gates are binary encoded.  However, the symbol
+  table and the comment section are as in the ASCII format.
+
+  The header of an AIGER file in binary format has 'aig' as format
+  identifier, but otherwise is identical to the ASCII header.  The standard
+  file extension for the binary format is therefore '.aig'. 
+  
+  A header for the binary format is still in ASCII encoding:
+
+    aig M I L O A
+
+  Constants, variables and literals are handled in the same way as in the
+  ASCII format.  The first simplifying restriction is on the variable
+  indices of inputs and latches.  The variable indices of inputs come first,
+  followed by the pseudo-primary inputs of the latches and then the variable
+  indices of all LHS of AND gates:
+
+    input variable indices        1,          2,  ... ,  I
+    latch variable indices      I+1,        I+2,  ... ,  (I+L)
+    AND variable indices      I+L+1,      I+L+2,  ... ,  (I+L+A) == M
+
+  The corresponding unsigned literals are
+
+    input literals                2,          4,  ... ,  2*I
+    latch literals            2*I+2,      2*I+4,  ... ,  2*(I+L)
+    AND literals          2*(I+L)+2,  2*(I+L)+4,  ... ,  2*(I+L+A) == 2*M
+                    
+  All literals have to be defined, and therefore 'M = I + L + A'.  With this
+  restriction it becomes possible that the inputs and the current state
+  literals of the latches do not have to be listed explicitly.  Therefore,
+  after the header only the list of 'L' next state literals follows, one per
+  latch on a single line, and then the 'O' outputs, again one per line.
+
+  In the binary format we assume that the AND gates are ordered and respect
+  the child parent relation.  AND gates with smaller literals on the LHS
+  come first.  Therefore we can assume that the literals on the right-hand
+  side of a definition of an AND gate are smaller than the LHS literal.
+  Furthermore we can sort the literals on the RHS, such that the larger
+  literal comes first.  A definition thus consists of three literals
+    
+      lhs rhs0 rhs1
+
+  with 'lhs' even and 'lhs > rhs0 >= rhs1'.  Also the variable indices are
+  pairwise different to avoid combinational self loops.  Since the LHS
+  indices of the definitions are all consecutive (as even integers),
+  the binary format does not have to keep 'lhs'.  In addition, we can use
+  the order restriction and only write the differences 'delta0' and 'delta1'
+  instead of 'rhs0' and 'rhs1', with
+
+      delta0 = lhs - rhs0,  delta1 = rhs0 - rhs1
+  
+  The differences will all be strictly positive, and in practice often very
+  small.  We can take advantage of this fact by the simple little-endian
+  encoding of unsigned integers of the next section.  After the binary delta
+  encoding of the RHSs of all AND gates, the optional symbol table and
+  optional comment section start in the same format as in the ASCII case.
+
+  ...
+
+*/
+
+static unsigned Ioa_ObjMakeLit( int Var, int fCompl )                 { return (Var << 1) | fCompl;    }
+static unsigned Ioa_ObjAigerNum( Aig_Obj_t * pObj )                   { return (unsigned)pObj->pData;  }
+static void     Ioa_ObjSetAigerNum( Aig_Obj_t * pObj, unsigned Num )  { pObj->pData = (void *)Num;     }
+
+int      Ioa_WriteAigerEncode( char * pBuffer, int Pos, unsigned x );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the AIG in the binary AIGER format.]
+
+  Description []
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ioa_WriteAiger( Aig_Man_t * pMan, char * pFileName, int fWriteSymbols )
+{
+    Bar_Progress_t * pProgress;
+    FILE * pFile;
+    Aig_Obj_t * pObj, * pDriver;
+    int i, nNodes, Pos, nBufferSize;
+    unsigned char * pBuffer;
+    unsigned uLit0, uLit1, uLit;
+
+//    assert( Aig_ManIsStrash(pMan) );
+    // start the output stream
+    pFile = fopen( pFileName, "wb" );
+    if ( pFile == NULL )
+    {
+        fprintf( stdout, "Ioa_WriteAiger(): Cannot open the output file \"%s\".\n", pFileName );
+        return;
+    }
+/*
+    Aig_ManForEachLatch( pMan, pObj, i )
+        if ( !Aig_LatchIsInit0(pObj) )
+        {
+            fprintf( stdout, "Ioa_WriteAiger(): Cannot write AIGER format with non-0 latch init values. Run \"zero\".\n" );
+            return;
+        }
+*/
+    // set the node numbers to be used in the output file
+    nNodes = 0;
+    Ioa_ObjSetAigerNum( Aig_ManConst1(pMan), nNodes++ );
+    Aig_ManForEachPi( pMan, pObj, i )
+        Ioa_ObjSetAigerNum( pObj, nNodes++ );
+    Aig_ManForEachNode( pMan, pObj, i )
+        Ioa_ObjSetAigerNum( pObj, nNodes++ );
+
+    // write the header "M I L O A" where M = I + L + A
+    fprintf( pFile, "aig %u %u %u %u %u\n", 
+        Aig_ManPiNum(pMan) + Aig_ManNodeNum(pMan), 
+        Aig_ManPiNum(pMan) - Aig_ManRegNum(pMan),
+        Aig_ManRegNum(pMan),
+        Aig_ManPoNum(pMan) - Aig_ManRegNum(pMan),
+        Aig_ManNodeNum(pMan) );
+
+    // if the driver node is a constant, we need to complement the literal below
+    // because, in the AIGER format, literal 0/1 is represented as number 0/1
+    // while, in ABC, constant 1 node has number 0 and so literal 0/1 will be 1/0
+
+    // write latch drivers
+    Aig_ManForEachLiSeq( pMan, pObj, i )
+    {
+        pDriver = Aig_ObjFanin0(pObj);
+        fprintf( pFile, "%u\n", Ioa_ObjMakeLit( Ioa_ObjAigerNum(pDriver), Aig_ObjFaninC0(pObj) ^ (Ioa_ObjAigerNum(pDriver) == 0) ) );
+    }
+
+    // write PO drivers
+    Aig_ManForEachPoSeq( pMan, pObj, i )
+    {
+        pDriver = Aig_ObjFanin0(pObj);
+        fprintf( pFile, "%u\n", Ioa_ObjMakeLit( Ioa_ObjAigerNum(pDriver), Aig_ObjFaninC0(pObj) ^ (Ioa_ObjAigerNum(pDriver) == 0) ) );
+    }
+
+    // write the nodes into the buffer
+    Pos = 0;
+    nBufferSize = 6 * Aig_ManNodeNum(pMan) + 100; // skeptically assuming 3 chars per one AIG edge
+    pBuffer = ALLOC( char, nBufferSize );
+    pProgress = Bar_ProgressStart( stdout, Aig_ManObjNumMax(pMan) );
+    Aig_ManForEachNode( pMan, pObj, i )
+    {
+        Bar_ProgressUpdate( pProgress, i, NULL );
+        uLit  = Ioa_ObjMakeLit( Ioa_ObjAigerNum(pObj), 0 );
+        uLit0 = Ioa_ObjMakeLit( Ioa_ObjAigerNum(Aig_ObjFanin0(pObj)), Aig_ObjFaninC0(pObj) );
+        uLit1 = Ioa_ObjMakeLit( Ioa_ObjAigerNum(Aig_ObjFanin1(pObj)), Aig_ObjFaninC1(pObj) );
+        assert( uLit0 < uLit1 );
+        Pos = Ioa_WriteAigerEncode( pBuffer, Pos, uLit  - uLit1 );
+        Pos = Ioa_WriteAigerEncode( pBuffer, Pos, uLit1 - uLit0 );
+        if ( Pos > nBufferSize - 10 )
+        {
+            printf( "Ioa_WriteAiger(): AIGER generation has failed because the allocated buffer is too small.\n" );
+            fclose( pFile );
+            return;
+        }
+    }
+    assert( Pos < nBufferSize );
+    Bar_ProgressStop( pProgress );
+
+    // write the buffer
+    fwrite( pBuffer, 1, Pos, pFile );
+    free( pBuffer );
+/*
+    // write the symbol table
+    if ( fWriteSymbols )
+    {
+        // write PIs
+        Aig_ManForEachPi( pMan, pObj, i )
+            fprintf( pFile, "i%d %s\n", i, Aig_ObjName(pObj) );
+        // write latches
+        Aig_ManForEachLatch( pMan, pObj, i )
+            fprintf( pFile, "l%d %s\n", i, Aig_ObjName(Aig_ObjFanout0(pObj)) );
+        // write POs
+        Aig_ManForEachPo( pMan, pObj, i )
+            fprintf( pFile, "o%d %s\n", i, Aig_ObjName(pObj) );
+    }
+*/
+    // write the comment
+    fprintf( pFile, "c\n" );
+    if ( pMan->pName )
+        fprintf( pFile, ".model %s\n", pMan->pName );
+    fprintf( pFile, "This file was produced by the AIG package in ABC on %s\n", Ioa_TimeStamp() );
+    fprintf( pFile, "For information about AIGER format, refer to %s\n", "http://fmv.jku.at/aiger" );
+    fclose( pFile );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one unsigned AIG edge to the output buffer.]
+
+  Description [This procedure is a slightly modified version of Armin Biere's
+  procedure "void encode (FILE * file, unsigned x)" ]
+  
+  SideEffects [Returns the current writing position.]
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ioa_WriteAigerEncode( char * pBuffer, int Pos, unsigned x )
+{
+    unsigned char ch;
+    while (x & ~0x7f)
+    {
+        ch = (x & 0x7f) | 0x80;
+//        putc (ch, file);
+        pBuffer[Pos++] = ch;
+        x >>= 7;
+    }
+    ch = x;
+//    putc (ch, file);
+    pBuffer[Pos++] = ch;
+    return Pos;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ioa/module.make b/abc70930/src/aig/ioa/module.make
new file mode 100644
index 00000000..66b4a0d5
--- /dev/null
+++ b/abc70930/src/aig/ioa/module.make
@@ -0,0 +1,3 @@
+SRC +=    src/aig/ioa/ioaReadAig.c \
+    src/aig/ioa/ioaWriteAig.c \
+    src/aig/ioa/ioaUtil.c      
diff --git a/abc70930/src/aig/ivy/attr.h b/abc70930/src/aig/ivy/attr.h
new file mode 100644
index 00000000..16cf0b84
--- /dev/null
+++ b/abc70930/src/aig/ivy/attr.h
@@ -0,0 +1,414 @@
+/**CFile****************************************************************
+
+  FileName    [attr.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Network attributes.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: attr.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __ATTR_H__
+#define __ATTR_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include "extra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Attr_ManStruct_t_     Attr_Man_t;
+struct Attr_ManStruct_t_
+{
+    // attribute info
+    int                        nAttrSize;     // the size of each attribute in bytes
+    Extra_MmFixed_t *          pManMem;       // memory manager for attributes
+    int                        nAttrs;        // the number of attributes allocated
+    void **                    pAttrs;        // the array of attributes
+    int                        fUseInt;       // uses integer attributes
+    // attribute specific info
+    void *                     pManAttr;      // the manager for this attribute
+    void (*pFuncFreeMan) (void *);            // the procedure to call to free attribute-specific manager
+    void (*pFuncFreeObj) (void *, void *);    // the procedure to call to free attribute-specific data
+};
+
+// at any time, an attribute of the given ID can be
+// - not available (p->nAttrs < Id)
+// - available but not allocated (p->nAttrs >= Id && p->pAttrs[Id] == NULL)
+// - available and allocated (p->nAttrs >= Id && p->pAttrs[Id] != NULL)
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the attribute manager.]
+
+  Description [The manager is simple if it does not need memory manager.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Attr_Man_t * Attr_ManAlloc( int nAttrSize, int fManMem )
+{
+    Attr_Man_t * p;
+    p = ALLOC( Attr_Man_t, 1 );
+    memset( p, 0, sizeof(Attr_Man_t) );
+    p->nAttrSize = nAttrSize;
+    if ( fManMem )
+        p->pManMem = Extra_MmFixedStart( nAttrSize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Start the attribute manager for integers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Attr_Man_t * Attr_ManStartInt( int nAttrs )
+{
+    Attr_Man_t * p;
+    p = Attr_ManAlloc( sizeof(int), 0 );
+    p->nAttrs  = nAttrs;
+    p->pAttrs  = (void **)ALLOC( int, nAttrs );
+    memset( (int *)p->pAttrs, 0, sizeof(int) * nAttrs );
+    p->fUseInt = 1;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Start the attribute manager for pointers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Attr_Man_t * Attr_ManStartPtr( int nAttrs )
+{
+    Attr_Man_t * p;
+    p = Attr_ManAlloc( sizeof(void *), 0 );
+    p->nAttrs  = nAttrs;
+    p->pAttrs  = ALLOC( void *, nAttrs );
+    memset( p->pAttrs, 0, sizeof(void *) * nAttrs );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Start the attribute manager for the fixed entry size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Attr_Man_t * Attr_ManStartPtrMem( int nAttrs, int nAttrSize )
+{
+    Attr_Man_t * p;
+    int i;
+    p = Attr_ManAlloc( nAttrSize, 1 );
+    p->nAttrs  = nAttrs;
+    p->pAttrs  = ALLOC( void *, nAttrs );
+    for ( i = 0; i < p->nAttrs; i++ )
+    {
+        p->pAttrs[i] = Extra_MmFixedEntryFetch( p->pManMem );
+        memset( p->pAttrs[i], 0, nAttrSize );
+    }
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stop the attribute manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Attr_ManStop( Attr_Man_t * p )
+{
+    // free the attributes of objects
+    if ( p->pFuncFreeObj )
+    {
+        int i;
+        if ( p->fUseInt )
+        {
+            for ( i = 0; i < p->nAttrs; i++ )
+                if ( ((int *)p->pAttrs)[i] )
+                    p->pFuncFreeObj( p->pManAttr, (void *)((int *)p->pAttrs)[i] );
+        }
+        else
+        {
+            for ( i = 0; i < p->nAttrs; i++ )
+                if ( p->pAttrs[i] )
+                    p->pFuncFreeObj( p->pManAttr, p->pAttrs[i] );
+        }
+    }
+    // free the attribute manager
+    if ( p->pManAttr && p->pFuncFreeMan )
+        p->pFuncFreeMan( p->pManAttr );
+    // free the memory manager
+    if ( p->pManMem )  
+        Extra_MmFixedStop( p->pManMem);
+    // free the attribute manager
+    FREE( p->pAttrs );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Attr_ManReadAttrInt( Attr_Man_t * p, int Id )
+{
+    assert( p->fUseInt );
+    if ( Id >= p->nAttrs )
+        return 0;
+    return ((int *)p->pAttrs)[Id]; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void * Attr_ManReadAttrPtr( Attr_Man_t * p, int Id )
+{
+    assert( !p->fUseInt );
+    if ( Id >= p->nAttrs )
+        return NULL;
+    return p->pAttrs[Id]; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Attr_ManWriteAttrInt( Attr_Man_t * p, int Id, int Attr )
+{
+    assert( p->fUseInt );
+    ((int *)p->pAttrs)[Id] = Attr; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Attr_ManWriteAttrPtr( Attr_Man_t * p, int Id, void * pAttr )
+{
+    assert( !p->fUseInt );
+    assert( p->pManMem == NULL );
+    p->pAttrs[Id] = pAttr; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns or creates the pointer to the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int * Attr_ManFetchSpotInt( Attr_Man_t * p, int Id )
+{
+    assert( p->fUseInt );
+    if ( Id >= p->nAttrs )
+    {
+        // save the old size
+        int i, nAttrsOld = p->nAttrs;
+        // get the new size
+        p->nAttrs = p->nAttrs? 2*p->nAttrs : 1024;
+        p->pAttrs = realloc( p->pAttrs, sizeof(int) * p->nAttrs ); 
+        // fill in the empty spots
+        for ( i = nAttrsOld; i < p->nAttrs; i++ )
+            ((int *)p->pAttrs)[Id] = 0;
+    }
+    return ((int *)p->pAttrs) + Id;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns or creates the pointer to the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void ** Attr_ManFetchSpotPtr( Attr_Man_t * p, int Id )
+{
+    assert( !p->fUseInt );
+    if ( Id >= p->nAttrs )
+    {
+        // save the old size
+        int i, nAttrsOld = p->nAttrs;
+        // get the new size
+        p->nAttrs = p->nAttrs? 2*p->nAttrs : 1024;
+        p->pAttrs = realloc( p->pAttrs, sizeof(void *) * p->nAttrs ); 
+        // fill in the empty spots
+        for ( i = nAttrsOld; i < p->nAttrs; i++ )
+            p->pAttrs[Id] = NULL;
+    }
+    // if memory manager is available but entry is not created, create it
+    if ( p->pManMem && p->pAttrs[Id] != NULL ) 
+    {
+        p->pAttrs[Id] = Extra_MmFixedEntryFetch( p->pManMem );
+        memset( p->pAttrs[Id], 0, p->nAttrSize );
+    }
+    return p->pAttrs + Id;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns or creates the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Attr_ManFetchAttrInt( Attr_Man_t * p, int Id )
+{
+    return *Attr_ManFetchSpotInt( p, Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns or creates the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void * Attr_ManFetchAttrPtr( Attr_Man_t * p, int Id )
+{
+    return *Attr_ManFetchSpotPtr( p, Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Attr_ManSetAttrInt( Attr_Man_t * p, int Id, int Attr )
+{
+    *Attr_ManFetchSpotInt( p, Id ) = Attr;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the attribute of the given object.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Attr_ManSetAttrPtr( Attr_Man_t * p, int Id, void * pAttr )
+{
+    assert( p->pManMem == NULL );
+    *Attr_ManFetchSpotPtr( p, Id ) = pAttr;
+}
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/ivy/ivy.h b/abc70930/src/aig/ivy/ivy.h
new file mode 100644
index 00000000..ed19d67c
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivy.h
@@ -0,0 +1,557 @@
+/**CFile****************************************************************
+
+  FileName    [ivy.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivy.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __IVY_H__
+#define __IVY_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif 
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include "extra.h"
+#include "vec.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Ivy_Man_t_            Ivy_Man_t;
+typedef struct Ivy_Obj_t_            Ivy_Obj_t;
+typedef int                          Ivy_Edge_t;
+typedef struct Ivy_FraigParams_t_    Ivy_FraigParams_t;
+
+// object types
+typedef enum { 
+    IVY_NONE,                        // 0: non-existent object
+    IVY_PI,                          // 1: primary input (and constant 1 node)
+    IVY_PO,                          // 2: primary output
+    IVY_ASSERT,                      // 3: assertion
+    IVY_LATCH,                       // 4: sequential element
+    IVY_AND,                         // 5: AND node
+    IVY_EXOR,                        // 6: EXOR node
+    IVY_BUF,                         // 7: buffer (temporary)
+    IVY_VOID                         // 8: unused object
+} Ivy_Type_t;
+
+// latch initial values
+typedef enum { 
+    IVY_INIT_NONE,                   // 0: not a latch
+    IVY_INIT_0,                      // 1: zero
+    IVY_INIT_1,                      // 2: one
+    IVY_INIT_DC                      // 3: don't-care
+} Ivy_Init_t;
+
+// the AIG node
+struct Ivy_Obj_t_  // 24 bytes (32-bit) or 32 bytes (64-bit)   // 10 words - 16 words
+{
+    int              Id;             // integer ID
+    int              TravId;         // traversal ID
+    unsigned         Type     :  4;  // object type
+    unsigned         fMarkA   :  1;  // multipurpose mask
+    unsigned         fMarkB   :  1;  // multipurpose mask
+    unsigned         fExFan   :  1;  // set to 1 if last fanout added is EXOR
+    unsigned         fPhase   :  1;  // value under 000...0 pattern
+    unsigned         fFailTfo :  1;  // the TFO of the failed node
+    unsigned         Init     :  2;  // latch initial value
+    unsigned         Level    : 21;  // logic level
+    int              nRefs;          // reference counter
+    Ivy_Obj_t *      pFanin0;        // fanin
+    Ivy_Obj_t *      pFanin1;        // fanin
+    Ivy_Obj_t *      pFanout;        // fanout
+    Ivy_Obj_t *      pNextFan0;      // next fanout of the first fanin
+    Ivy_Obj_t *      pNextFan1;      // next fanout of the second fanin
+    Ivy_Obj_t *      pPrevFan0;      // prev fanout of the first fanin
+    Ivy_Obj_t *      pPrevFan1;      // prev fanout of the second fanin
+    Ivy_Obj_t *      pEquiv;         // equivalent node
+};
+
+// the AIG manager
+struct Ivy_Man_t_
+{
+    // AIG nodes
+    Vec_Ptr_t *      vPis;           // the array of PIs
+    Vec_Ptr_t *      vPos;           // the array of POs
+    Vec_Ptr_t *      vBufs;          // the array of buffers
+    Vec_Ptr_t *      vObjs;          // the array of objects
+    Ivy_Obj_t *      pConst1;        // the constant 1 node
+    Ivy_Obj_t        Ghost;          // the ghost node
+    // AIG node counters
+    int              nObjs[IVY_VOID];// the number of objects by type
+    int              nCreated;       // the number of created objects
+    int              nDeleted;       // the number of deleted objects
+    // stuctural hash table
+    int *            pTable;         // structural hash table
+    int              nTableSize;     // structural hash table size
+    // various data members
+    int              fCatchExor;     // set to 1 to detect EXORs
+    int              nTravIds;       // the traversal ID
+    int              nLevelMax;      // the maximum level
+    Vec_Int_t *      vRequired;      // required times
+    int              fFanout;        // fanout is allocated
+    void *           pData;          // the temporary data
+    void *           pCopy;          // the temporary data
+    Ivy_Man_t *      pHaig;          // history AIG if present
+    int              nClassesSkip;   // the number of skipped classes
+    // memory management
+    Vec_Ptr_t *      vChunks;        // allocated memory pieces
+    Vec_Ptr_t *      vPages;         // memory pages used by nodes
+    Ivy_Obj_t *      pListFree;      // the list of free nodes 
+    // timing statistics
+    int              time1;
+    int              time2;
+};
+
+struct Ivy_FraigParams_t_
+{
+    int              nSimWords;         // the number of words in the simulation info
+    double           dSimSatur;         // the ratio of refined classes when saturation is reached
+    int              fPatScores;        // enables simulation pattern scoring
+    int              MaxScore;          // max score after which resimulation is used
+    double           dActConeRatio;     // the ratio of cone to be bumped
+    double           dActConeBumpMax;   // the largest bump in activity
+    int              fProve;            // prove the miter outputs
+    int              fVerbose;          // verbose output
+    int              fDoSparse;         // skip sparse functions
+    int              nBTLimitNode;      // conflict limit at a node
+    int              nBTLimitMiter;     // conflict limit at an output
+//    int              nBTLimitGlobal;    // conflict limit global
+//    int              nInsLimitNode;     // inspection limit at a node
+//    int              nInsLimitMiter;    // inspection limit at an output
+//    int              nInsLimitGlobal;   // inspection limit global
+};
+
+
+#define IVY_CUT_LIMIT     256
+#define IVY_CUT_INPUT       6
+
+typedef struct Ivy_Cut_t_ Ivy_Cut_t;
+struct Ivy_Cut_t_
+{
+    int         nLatches;
+    short       nSize;
+    short       nSizeMax;
+    int         pArray[IVY_CUT_INPUT];
+    unsigned    uHash;
+};
+
+typedef struct Ivy_Store_t_ Ivy_Store_t;
+struct Ivy_Store_t_
+{
+    int         nCuts;
+    int         nCutsM;
+    int         nCutsMax;
+    int         fSatur;
+    Ivy_Cut_t   pCuts[IVY_CUT_LIMIT]; // storage for cuts
+};
+
+#define IVY_LEAF_MASK     255
+#define IVY_LEAF_BITS       8
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+#define IVY_MIN(a,b)       (((a) < (b))? (a) : (b))
+#define IVY_MAX(a,b)       (((a) > (b))? (a) : (b))
+
+static inline int          Ivy_BitWordNum( int nBits )            { return (nBits>>5) + ((nBits&31) > 0);           }
+static inline int          Ivy_TruthWordNum( int nVars )          { return nVars <= 5 ? 1 : (1 << (nVars - 5));     }
+static inline int          Ivy_InfoHasBit( unsigned * p, int i )  { return (p[(i)>>5] & (1<<((i) & 31))) > 0;       }
+static inline void         Ivy_InfoSetBit( unsigned * p, int i )  { p[(i)>>5] |= (1<<((i) & 31));                   }
+static inline void         Ivy_InfoXorBit( unsigned * p, int i )  { p[(i)>>5] ^= (1<<((i) & 31));                   }
+
+static inline Ivy_Obj_t *  Ivy_Regular( Ivy_Obj_t * p )           { return (Ivy_Obj_t *)((unsigned long)(p) & ~01);      }
+static inline Ivy_Obj_t *  Ivy_Not( Ivy_Obj_t * p )               { return (Ivy_Obj_t *)((unsigned long)(p) ^  01);      }
+static inline Ivy_Obj_t *  Ivy_NotCond( Ivy_Obj_t * p, int c )    { return (Ivy_Obj_t *)((unsigned long)(p) ^ (c));      }
+static inline int          Ivy_IsComplement( Ivy_Obj_t * p )      { return (int )(((unsigned long)p) & 01);              }
+
+static inline Ivy_Obj_t *  Ivy_ManConst0( Ivy_Man_t * p )         { return Ivy_Not(p->pConst1);                     }
+static inline Ivy_Obj_t *  Ivy_ManConst1( Ivy_Man_t * p )         { return p->pConst1;                              }
+static inline Ivy_Obj_t *  Ivy_ManGhost( Ivy_Man_t * p )          { return &p->Ghost;                               }
+static inline Ivy_Obj_t *  Ivy_ManPi( Ivy_Man_t * p, int i )      { return (Ivy_Obj_t *)Vec_PtrEntry(p->vPis, i);   }
+static inline Ivy_Obj_t *  Ivy_ManPo( Ivy_Man_t * p, int i )      { return (Ivy_Obj_t *)Vec_PtrEntry(p->vPos, i);   }
+static inline Ivy_Obj_t *  Ivy_ManObj( Ivy_Man_t * p, int i )     { return (Ivy_Obj_t *)Vec_PtrEntry(p->vObjs, i);  }
+
+static inline Ivy_Edge_t   Ivy_EdgeCreate( int Id, int fCompl )            { return (Id << 1) | fCompl;             }
+static inline int          Ivy_EdgeId( Ivy_Edge_t Edge )                   { return Edge >> 1;                      }
+static inline int          Ivy_EdgeIsComplement( Ivy_Edge_t Edge )         { return Edge & 1;                       }
+static inline Ivy_Edge_t   Ivy_EdgeRegular( Ivy_Edge_t Edge )              { return (Edge >> 1) << 1;               }
+static inline Ivy_Edge_t   Ivy_EdgeNot( Ivy_Edge_t Edge )                  { return Edge ^ 1;                       }
+static inline Ivy_Edge_t   Ivy_EdgeNotCond( Ivy_Edge_t Edge, int fCond )   { return Edge ^ fCond;                   }
+static inline Ivy_Edge_t   Ivy_EdgeFromNode( Ivy_Obj_t * pNode )           { return Ivy_EdgeCreate( Ivy_Regular(pNode)->Id, Ivy_IsComplement(pNode) );          }
+static inline Ivy_Obj_t *  Ivy_EdgeToNode( Ivy_Man_t * p, Ivy_Edge_t Edge ){ return Ivy_NotCond( Ivy_ManObj(p, Ivy_EdgeId(Edge)), Ivy_EdgeIsComplement(Edge) ); }
+
+static inline int          Ivy_LeafCreate( int Id, int Lat )      { return (Id << IVY_LEAF_BITS) | Lat;         }
+static inline int          Ivy_LeafId( int Leaf )                 { return Leaf >> IVY_LEAF_BITS;               }
+static inline int          Ivy_LeafLat( int Leaf )                { return Leaf & IVY_LEAF_MASK;                }
+
+static inline int          Ivy_ManPiNum( Ivy_Man_t * p )          { return p->nObjs[IVY_PI];                    }
+static inline int          Ivy_ManPoNum( Ivy_Man_t * p )          { return p->nObjs[IVY_PO];                    }
+static inline int          Ivy_ManAssertNum( Ivy_Man_t * p )      { return p->nObjs[IVY_ASSERT];                }
+static inline int          Ivy_ManLatchNum( Ivy_Man_t * p )       { return p->nObjs[IVY_LATCH];                 }
+static inline int          Ivy_ManAndNum( Ivy_Man_t * p )         { return p->nObjs[IVY_AND];                   }
+static inline int          Ivy_ManExorNum( Ivy_Man_t * p )        { return p->nObjs[IVY_EXOR];                  }
+static inline int          Ivy_ManBufNum( Ivy_Man_t * p )         { return p->nObjs[IVY_BUF];                   }
+static inline int          Ivy_ManObjNum( Ivy_Man_t * p )         { return p->nCreated - p->nDeleted;           }
+static inline int          Ivy_ManObjIdMax( Ivy_Man_t * p )       { return Vec_PtrSize(p->vObjs)-1;             }
+static inline int          Ivy_ManNodeNum( Ivy_Man_t * p )        { return p->nObjs[IVY_AND]+p->nObjs[IVY_EXOR];}
+static inline int          Ivy_ManHashObjNum( Ivy_Man_t * p )     { return p->nObjs[IVY_AND]+p->nObjs[IVY_EXOR]+p->nObjs[IVY_LATCH];     }
+static inline int          Ivy_ManGetCost( Ivy_Man_t * p )        { return p->nObjs[IVY_AND]+3*p->nObjs[IVY_EXOR]+8*p->nObjs[IVY_LATCH]; }
+
+static inline Ivy_Type_t   Ivy_ObjType( Ivy_Obj_t * pObj )        { return pObj->Type;               }
+static inline Ivy_Init_t   Ivy_ObjInit( Ivy_Obj_t * pObj )        { return pObj->Init;               }
+static inline int          Ivy_ObjIsConst1( Ivy_Obj_t * pObj )    { return pObj->Id == 0;            }
+static inline int          Ivy_ObjIsGhost( Ivy_Obj_t * pObj )     { return pObj->Id < 0;             }
+static inline int          Ivy_ObjIsNone( Ivy_Obj_t * pObj )      { return pObj->Type == IVY_NONE;   }
+static inline int          Ivy_ObjIsPi( Ivy_Obj_t * pObj )        { return pObj->Type == IVY_PI;     }
+static inline int          Ivy_ObjIsPo( Ivy_Obj_t * pObj )        { return pObj->Type == IVY_PO;     }
+static inline int          Ivy_ObjIsCi( Ivy_Obj_t * pObj )        { return pObj->Type == IVY_PI || pObj->Type == IVY_LATCH; }
+static inline int          Ivy_ObjIsCo( Ivy_Obj_t * pObj )        { return pObj->Type == IVY_PO || pObj->Type == IVY_LATCH; }
+static inline int          Ivy_ObjIsAssert( Ivy_Obj_t * pObj )    { return pObj->Type == IVY_ASSERT; }
+static inline int          Ivy_ObjIsLatch( Ivy_Obj_t * pObj )     { return pObj->Type == IVY_LATCH;  }
+static inline int          Ivy_ObjIsAnd( Ivy_Obj_t * pObj )       { return pObj->Type == IVY_AND;    }
+static inline int          Ivy_ObjIsExor( Ivy_Obj_t * pObj )      { return pObj->Type == IVY_EXOR;   }
+static inline int          Ivy_ObjIsBuf( Ivy_Obj_t * pObj )       { return pObj->Type == IVY_BUF;    }
+static inline int          Ivy_ObjIsNode( Ivy_Obj_t * pObj )      { return pObj->Type == IVY_AND || pObj->Type == IVY_EXOR; }
+static inline int          Ivy_ObjIsTerm( Ivy_Obj_t * pObj )      { return pObj->Type == IVY_PI  || pObj->Type == IVY_PO || pObj->Type == IVY_ASSERT; }
+static inline int          Ivy_ObjIsHash( Ivy_Obj_t * pObj )      { return pObj->Type == IVY_AND || pObj->Type == IVY_EXOR || pObj->Type == IVY_LATCH; }
+static inline int          Ivy_ObjIsOneFanin( Ivy_Obj_t * pObj )  { return pObj->Type == IVY_PO  || pObj->Type == IVY_ASSERT || pObj->Type == IVY_BUF || pObj->Type == IVY_LATCH; }
+
+static inline int          Ivy_ObjIsMarkA( Ivy_Obj_t * pObj )     { return pObj->fMarkA;  }
+static inline void         Ivy_ObjSetMarkA( Ivy_Obj_t * pObj )    { pObj->fMarkA = 1;     }
+static inline void         Ivy_ObjClearMarkA( Ivy_Obj_t * pObj )  { pObj->fMarkA = 0;     }
+ 
+static inline void         Ivy_ObjSetTravId( Ivy_Obj_t * pObj, int TravId )                { pObj->TravId = TravId;                               }
+static inline void         Ivy_ObjSetTravIdCurrent( Ivy_Man_t * p, Ivy_Obj_t * pObj )      { pObj->TravId = p->nTravIds;                          }
+static inline void         Ivy_ObjSetTravIdPrevious( Ivy_Man_t * p, Ivy_Obj_t * pObj )     { pObj->TravId = p->nTravIds - 1;                      }
+static inline int          Ivy_ObjIsTravIdCurrent( Ivy_Man_t * p, Ivy_Obj_t * pObj )       { return (int )((int)pObj->TravId == p->nTravIds);     }
+static inline int          Ivy_ObjIsTravIdPrevious( Ivy_Man_t * p, Ivy_Obj_t * pObj )      { return (int )((int)pObj->TravId == p->nTravIds - 1); }
+
+static inline int          Ivy_ObjId( Ivy_Obj_t * pObj )          { return pObj->Id;                               }
+static inline int          Ivy_ObjTravId( Ivy_Obj_t * pObj )      { return pObj->TravId;                           }
+static inline int          Ivy_ObjPhase( Ivy_Obj_t * pObj )       { return pObj->fPhase;                           }
+static inline int          Ivy_ObjExorFanout( Ivy_Obj_t * pObj )  { return pObj->fExFan;                           }
+static inline int          Ivy_ObjRefs( Ivy_Obj_t * pObj )        { return pObj->nRefs;                            }
+static inline void         Ivy_ObjRefsInc( Ivy_Obj_t * pObj )     { pObj->nRefs++;                                 }
+static inline void         Ivy_ObjRefsDec( Ivy_Obj_t * pObj )     { assert( pObj->nRefs > 0 ); pObj->nRefs--;      }
+static inline int          Ivy_ObjFaninId0( Ivy_Obj_t * pObj )    { return pObj->pFanin0? Ivy_ObjId(Ivy_Regular(pObj->pFanin0)) : 0; }
+static inline int          Ivy_ObjFaninId1( Ivy_Obj_t * pObj )    { return pObj->pFanin1? Ivy_ObjId(Ivy_Regular(pObj->pFanin1)) : 0; }
+static inline int          Ivy_ObjFaninC0( Ivy_Obj_t * pObj )     { return Ivy_IsComplement(pObj->pFanin0);        }
+static inline int          Ivy_ObjFaninC1( Ivy_Obj_t * pObj )     { return Ivy_IsComplement(pObj->pFanin1);        }
+static inline Ivy_Obj_t *  Ivy_ObjFanin0( Ivy_Obj_t * pObj )      { return Ivy_Regular(pObj->pFanin0);             }
+static inline Ivy_Obj_t *  Ivy_ObjFanin1( Ivy_Obj_t * pObj )      { return Ivy_Regular(pObj->pFanin1);             }
+static inline Ivy_Obj_t *  Ivy_ObjChild0( Ivy_Obj_t * pObj )      { return pObj->pFanin0;                          }
+static inline Ivy_Obj_t *  Ivy_ObjChild1( Ivy_Obj_t * pObj )      { return pObj->pFanin1;                          }
+static inline Ivy_Obj_t *  Ivy_ObjChild0Equiv( Ivy_Obj_t * pObj ) { assert( !Ivy_IsComplement(pObj) ); return Ivy_ObjFanin0(pObj)? Ivy_NotCond(Ivy_ObjFanin0(pObj)->pEquiv, Ivy_ObjFaninC0(pObj)) : NULL;  }
+static inline Ivy_Obj_t *  Ivy_ObjChild1Equiv( Ivy_Obj_t * pObj ) { assert( !Ivy_IsComplement(pObj) ); return Ivy_ObjFanin1(pObj)? Ivy_NotCond(Ivy_ObjFanin1(pObj)->pEquiv, Ivy_ObjFaninC1(pObj)) : NULL;  }
+static inline Ivy_Obj_t *  Ivy_ObjEquiv( Ivy_Obj_t * pObj )       { return Ivy_Regular(pObj)->pEquiv? Ivy_NotCond(Ivy_Regular(pObj)->pEquiv, Ivy_IsComplement(pObj)) : NULL; }
+static inline int          Ivy_ObjLevel( Ivy_Obj_t * pObj )       { return pObj->Level;                            }
+static inline int          Ivy_ObjLevelNew( Ivy_Obj_t * pObj )    { return 1 + Ivy_ObjIsExor(pObj) + IVY_MAX(Ivy_ObjFanin0(pObj)->Level, Ivy_ObjFanin1(pObj)->Level);       }
+static inline int          Ivy_ObjFaninPhase( Ivy_Obj_t * pObj )  { return Ivy_IsComplement(pObj)? !Ivy_Regular(pObj)->fPhase : pObj->fPhase; }
+
+static inline void         Ivy_ObjClean( Ivy_Obj_t * pObj )       
+{ 
+    int IdSaved = pObj->Id; 
+    memset( pObj, 0, sizeof(Ivy_Obj_t) ); 
+    pObj->Id = IdSaved; 
+}
+static inline void         Ivy_ObjOverwrite( Ivy_Obj_t * pBase, Ivy_Obj_t * pData )   
+{ 
+    int IdSaved = pBase->Id; 
+    memcpy( pBase, pData, sizeof(Ivy_Obj_t) ); 
+    pBase->Id = IdSaved;         
+}
+static inline int          Ivy_ObjWhatFanin( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanin )    
+{ 
+    if ( Ivy_ObjFanin0(pObj) == pFanin ) return 0; 
+    if ( Ivy_ObjFanin1(pObj) == pFanin ) return 1; 
+    assert(0); return -1; 
+}
+static inline int          Ivy_ObjFanoutC( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )    
+{ 
+    if ( Ivy_ObjFanin0(pFanout) == pObj ) return Ivy_ObjFaninC0(pObj); 
+    if ( Ivy_ObjFanin1(pFanout) == pObj ) return Ivy_ObjFaninC1(pObj); 
+    assert(0); return -1; 
+}
+
+// create the ghost of the new node
+static inline Ivy_Obj_t *  Ivy_ObjCreateGhost( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1, Ivy_Type_t Type, Ivy_Init_t Init )    
+{
+    Ivy_Obj_t * pGhost, * pTemp;
+    assert( Type != IVY_AND || !Ivy_ObjIsConst1(Ivy_Regular(p0)) );
+    assert( p1 == NULL || !Ivy_ObjIsConst1(Ivy_Regular(p1)) );
+    assert( Type == IVY_PI || Ivy_Regular(p0) != Ivy_Regular(p1) );
+    assert( Type != IVY_LATCH || !Ivy_IsComplement(p0) );
+//    assert( p1 == NULL || (!Ivy_ObjIsLatch(Ivy_Regular(p0)) || !Ivy_ObjIsLatch(Ivy_Regular(p1))) );
+    pGhost = Ivy_ManGhost(p);
+    pGhost->Type = Type;
+    pGhost->Init = Init;
+    pGhost->pFanin0 = p0;
+    pGhost->pFanin1 = p1;
+    if ( p1 && Ivy_ObjFaninId0(pGhost) > Ivy_ObjFaninId1(pGhost) )
+        pTemp = pGhost->pFanin0, pGhost->pFanin0 = pGhost->pFanin1, pGhost->pFanin1 = pTemp;
+    return pGhost;
+}
+
+// get the complemented initial state
+static Ivy_Init_t Ivy_InitNotCond( Ivy_Init_t Init, int fCompl )
+{
+    assert( Init != IVY_INIT_NONE );
+    if ( fCompl == 0 )
+        return Init;
+    if ( Init == IVY_INIT_0 )
+        return IVY_INIT_1;
+    if ( Init == IVY_INIT_1 )
+        return IVY_INIT_0;
+    return IVY_INIT_DC;
+}
+
+// get the initial state after forward retiming over AND gate
+static Ivy_Init_t Ivy_InitAnd( Ivy_Init_t InitA, Ivy_Init_t InitB )
+{
+    assert( InitA != IVY_INIT_NONE && InitB != IVY_INIT_NONE );
+    if ( InitA == IVY_INIT_0 || InitB == IVY_INIT_0 )
+        return IVY_INIT_0;
+    if ( InitA == IVY_INIT_DC || InitB == IVY_INIT_DC )
+        return IVY_INIT_DC;
+    return IVY_INIT_1;
+}
+
+// get the initial state after forward retiming over EXOR gate
+static Ivy_Init_t Ivy_InitExor( Ivy_Init_t InitA, Ivy_Init_t InitB )
+{
+    assert( InitA != IVY_INIT_NONE && InitB != IVY_INIT_NONE );
+    if ( InitA == IVY_INIT_DC || InitB == IVY_INIT_DC )
+        return IVY_INIT_DC;
+    if ( InitA == IVY_INIT_0 && InitB == IVY_INIT_1 )
+        return IVY_INIT_1;
+    if ( InitA == IVY_INIT_1 && InitB == IVY_INIT_0 )
+        return IVY_INIT_1;
+    return IVY_INIT_0;
+}
+
+// internal memory manager
+static inline Ivy_Obj_t * Ivy_ManFetchMemory( Ivy_Man_t * p )  
+{ 
+    extern void Ivy_ManAddMemory( Ivy_Man_t * p );
+    Ivy_Obj_t * pTemp;
+    if ( p->pListFree == NULL )
+        Ivy_ManAddMemory( p );
+    pTemp = p->pListFree;
+    p->pListFree = *((Ivy_Obj_t **)pTemp);
+    memset( pTemp, 0, sizeof(Ivy_Obj_t) ); 
+    return pTemp;
+}
+static inline void Ivy_ManRecycleMemory( Ivy_Man_t * p, Ivy_Obj_t * pEntry )
+{
+    pEntry->Type = IVY_NONE; // distinquishes dead node from live node
+    *((Ivy_Obj_t **)pEntry) = p->pListFree;
+    p->pListFree = pEntry;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                             ITERATORS                            ///
+////////////////////////////////////////////////////////////////////////
+
+// iterator over the primary inputs
+#define Ivy_ManForEachPi( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPis, pObj, i )
+// iterator over the primary outputs
+#define Ivy_ManForEachPo( p, pObj, i )                                          \
+    Vec_PtrForEachEntry( p->vPos, pObj, i )
+// iterator over all objects, including those currently not used
+#define Ivy_ManForEachObj( p, pObj, i )                                         \
+    Vec_PtrForEachEntry( p->vObjs, pObj, i ) if ( (pObj) == NULL ) {} else
+// iterator over the combinational inputs
+#define Ivy_ManForEachCi( p, pObj, i )                                          \
+    Ivy_ManForEachObj( p, pObj, i ) if ( !Ivy_ObjIsCi(pObj) ) {} else
+// iterator over the combinational outputs
+#define Ivy_ManForEachCo( p, pObj, i )                                          \
+    Ivy_ManForEachObj( p, pObj, i ) if ( !Ivy_ObjIsCo(pObj) ) {} else
+// iterator over logic nodes (AND and EXOR gates)
+#define Ivy_ManForEachNode( p, pObj, i )                                        \
+    Ivy_ManForEachObj( p, pObj, i ) if ( !Ivy_ObjIsNode(pObj) ) {} else
+// iterator over logic latches
+#define Ivy_ManForEachLatch( p, pObj, i )                                       \
+    Ivy_ManForEachObj( p, pObj, i ) if ( !Ivy_ObjIsLatch(pObj) ) {} else
+// iterator over the nodes whose IDs are stored in the array
+#define Ivy_ManForEachNodeVec( p, vIds, pObj, i )                               \
+    for ( i = 0; i < Vec_IntSize(vIds) && ((pObj) = Ivy_ManObj(p, Vec_IntEntry(vIds,i))); i++ )
+// iterator over the fanouts of an object
+#define Ivy_ObjForEachFanout( p, pObj, vArray, pFanout, i )                     \
+    for ( i = 0, Ivy_ObjCollectFanouts(p, pObj, vArray);                        \
+          i < Vec_PtrSize(vArray) && ((pFanout) = Vec_PtrEntry(vArray,i)); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== ivyBalance.c ========================================================*/
+extern Ivy_Man_t *     Ivy_ManBalance( Ivy_Man_t * p, int fUpdateLevel );
+extern Ivy_Obj_t *     Ivy_NodeBalanceBuildSuper( Ivy_Man_t * p, Vec_Ptr_t * vSuper, Ivy_Type_t Type, int fUpdateLevel );
+/*=== ivyCanon.c ========================================================*/
+extern Ivy_Obj_t *     Ivy_CanonAnd( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 );
+extern Ivy_Obj_t *     Ivy_CanonExor( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 );
+extern Ivy_Obj_t *     Ivy_CanonLatch( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Init_t Init );
+/*=== ivyCheck.c ========================================================*/
+extern int             Ivy_ManCheck( Ivy_Man_t * p );
+extern int             Ivy_ManCheckFanoutNums( Ivy_Man_t * p );
+extern int             Ivy_ManCheckFanouts( Ivy_Man_t * p );
+extern int             Ivy_ManCheckChoices( Ivy_Man_t * p );
+/*=== ivyCut.c ==========================================================*/
+extern void            Ivy_ManSeqFindCut( Ivy_Man_t * p, Ivy_Obj_t * pNode, Vec_Int_t * vFront, Vec_Int_t * vInside, int nSize );
+extern Ivy_Store_t *   Ivy_NodeFindCutsAll( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves );
+/*=== ivyDfs.c ==========================================================*/
+extern Vec_Int_t *     Ivy_ManDfs( Ivy_Man_t * p );
+extern Vec_Int_t *     Ivy_ManDfsSeq( Ivy_Man_t * p, Vec_Int_t ** pvLatches );
+extern void            Ivy_ManCollectCone( Ivy_Obj_t * pObj, Vec_Ptr_t * vFront, Vec_Ptr_t * vCone );
+extern Vec_Vec_t *     Ivy_ManLevelize( Ivy_Man_t * p );
+extern Vec_Int_t *     Ivy_ManRequiredLevels( Ivy_Man_t * p );
+extern int             Ivy_ManIsAcyclic( Ivy_Man_t * p );
+extern int             Ivy_ManSetLevels( Ivy_Man_t * p, int fHaig );
+/*=== ivyDsd.c ==========================================================*/
+extern int             Ivy_TruthDsd( unsigned uTruth, Vec_Int_t * vTree );
+extern void            Ivy_TruthDsdPrint( FILE * pFile, Vec_Int_t * vTree );
+extern unsigned        Ivy_TruthDsdCompute( Vec_Int_t * vTree );
+extern void            Ivy_TruthDsdComputePrint( unsigned uTruth );
+extern Ivy_Obj_t *     Ivy_ManDsdConstruct( Ivy_Man_t * p, Vec_Int_t * vFront, Vec_Int_t * vTree );
+/*=== ivyFanout.c ==========================================================*/
+extern void            Ivy_ManStartFanout( Ivy_Man_t * p );
+extern void            Ivy_ManStopFanout( Ivy_Man_t * p );
+extern void            Ivy_ObjAddFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout );
+extern void            Ivy_ObjDeleteFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout );
+extern void            Ivy_ObjPatchFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanoutOld, Ivy_Obj_t * pFanoutNew );
+extern void            Ivy_ObjCollectFanouts( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Ptr_t * vArray );
+extern Ivy_Obj_t *     Ivy_ObjReadFirstFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern int             Ivy_ObjFanoutNum( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+/*=== ivyFastMap.c =============================================================*/
+extern void            Ivy_FastMapPerform( Ivy_Man_t * pAig, int nLimit, int fRecovery, int fVerbose );
+extern void            Ivy_FastMapStop( Ivy_Man_t * pAig );
+extern void            Ivy_FastMapReadSupp( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Int_t * vLeaves );
+extern void            Ivy_FastMapReverseLevel( Ivy_Man_t * pAig );
+/*=== ivyFraig.c ==========================================================*/
+extern int             Ivy_FraigProve( Ivy_Man_t ** ppManAig, void * pPars );
+extern Ivy_Man_t *     Ivy_FraigPerform( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams );
+extern Ivy_Man_t *     Ivy_FraigMiter( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams );
+extern void            Ivy_FraigParamsDefault( Ivy_FraigParams_t * pParams );
+/*=== ivyHaig.c ==========================================================*/
+extern void            Ivy_ManHaigStart( Ivy_Man_t * p, int fVerbose );
+extern void            Ivy_ManHaigTrasfer( Ivy_Man_t * p, Ivy_Man_t * pNew );
+extern void            Ivy_ManHaigStop( Ivy_Man_t * p );
+extern void            Ivy_ManHaigPostprocess( Ivy_Man_t * p, int fVerbose );
+extern void            Ivy_ManHaigCreateObj( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_ManHaigCreateChoice( Ivy_Man_t * p, Ivy_Obj_t * pObjOld, Ivy_Obj_t * pObjNew );
+extern void            Ivy_ManHaigSimulate( Ivy_Man_t * p );
+/*=== ivyMan.c ==========================================================*/
+extern Ivy_Man_t *     Ivy_ManStart();
+extern Ivy_Man_t *     Ivy_ManStartFrom( Ivy_Man_t * p );
+extern Ivy_Man_t *     Ivy_ManDup( Ivy_Man_t * p );
+extern Ivy_Man_t *     Ivy_ManFrames( Ivy_Man_t * pMan, int nLatches, int nFrames, int fInit, Vec_Ptr_t ** pvMapping );
+extern void            Ivy_ManStop( Ivy_Man_t * p );
+extern int             Ivy_ManCleanup( Ivy_Man_t * p );
+extern int             Ivy_ManPropagateBuffers( Ivy_Man_t * p, int fUpdateLevel );
+extern void            Ivy_ManPrintStats( Ivy_Man_t * p );
+extern void            Ivy_ManMakeSeq( Ivy_Man_t * p, int nLatches, int * pInits );
+/*=== ivyMem.c ==========================================================*/
+extern void            Ivy_ManStartMemory( Ivy_Man_t * p );
+extern void            Ivy_ManStopMemory( Ivy_Man_t * p );
+/*=== ivyMulti.c ==========================================================*/
+extern Ivy_Obj_t *     Ivy_Multi( Ivy_Man_t * p, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type );
+extern Ivy_Obj_t *     Ivy_Multi1( Ivy_Man_t * p, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type );
+extern Ivy_Obj_t *     Ivy_Multi_rec( Ivy_Man_t * p, Ivy_Obj_t ** ppObjs, int nObjs, Ivy_Type_t Type );
+extern Ivy_Obj_t *     Ivy_MultiBalance_rec( Ivy_Man_t * p, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type );
+extern int             Ivy_MultiPlus( Ivy_Man_t * p, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone, Ivy_Type_t Type, int nLimit, Vec_Ptr_t * vSol );
+/*=== ivyObj.c ==========================================================*/
+extern Ivy_Obj_t *     Ivy_ObjCreatePi( Ivy_Man_t * p );
+extern Ivy_Obj_t *     Ivy_ObjCreatePo( Ivy_Man_t * p, Ivy_Obj_t * pDriver );
+extern Ivy_Obj_t *     Ivy_ObjCreate( Ivy_Man_t * p, Ivy_Obj_t * pGhost );
+extern void            Ivy_ObjConnect( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFan0, Ivy_Obj_t * pFan1 );
+extern void            Ivy_ObjDisconnect( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_ObjPatchFanin0( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFaninNew );
+extern void            Ivy_ObjDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop );
+extern void            Ivy_ObjDelete_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop );
+extern void            Ivy_ObjReplace( Ivy_Man_t * p, Ivy_Obj_t * pObjOld, Ivy_Obj_t * pObjNew, int fDeleteOld, int fFreeTop, int fUpdateLevel );
+extern void            Ivy_NodeFixBufferFanins( Ivy_Man_t * p, Ivy_Obj_t * pNode, int fUpdateLevel );
+/*=== ivyOper.c =========================================================*/
+extern Ivy_Obj_t *     Ivy_Oper( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1, Ivy_Type_t Type );
+extern Ivy_Obj_t *     Ivy_And( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 );
+extern Ivy_Obj_t *     Ivy_Or( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 );
+extern Ivy_Obj_t *     Ivy_Exor( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 );
+extern Ivy_Obj_t *     Ivy_Mux( Ivy_Man_t * p, Ivy_Obj_t * pC, Ivy_Obj_t * p1, Ivy_Obj_t * p0 );
+extern Ivy_Obj_t *     Ivy_Maj( Ivy_Man_t * p, Ivy_Obj_t * pA, Ivy_Obj_t * pB, Ivy_Obj_t * pC );
+extern Ivy_Obj_t *     Ivy_Miter( Ivy_Man_t * p, Vec_Ptr_t * vPairs );
+extern Ivy_Obj_t *     Ivy_Latch( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Init_t Init );
+/*=== ivyResyn.c =========================================================*/
+extern Ivy_Man_t *     Ivy_ManResyn0( Ivy_Man_t * p, int fUpdateLevel, int fVerbose );
+extern Ivy_Man_t *     Ivy_ManResyn( Ivy_Man_t * p, int fUpdateLevel, int fVerbose );
+extern Ivy_Man_t *     Ivy_ManRwsat( Ivy_Man_t * pMan, int fVerbose );
+/*=== ivyRewrite.c =========================================================*/
+extern int             Ivy_ManSeqRewrite( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost );
+extern int             Ivy_ManRewriteAlg( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost );
+extern int             Ivy_ManRewritePre( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost, int fVerbose );
+/*=== ivySeq.c =========================================================*/
+extern int             Ivy_ManRewriteSeq( Ivy_Man_t * p, int fUseZeroCost, int fVerbose );
+/*=== ivyShow.c =========================================================*/
+extern void            Ivy_ManShow( Ivy_Man_t * pMan, int fHaig, Vec_Ptr_t * vBold );
+/*=== ivyTable.c ========================================================*/
+extern Ivy_Obj_t *     Ivy_TableLookup( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_TableInsert( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_TableDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_TableUpdate( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ObjIdNew );
+extern int             Ivy_TableCountEntries( Ivy_Man_t * p );
+extern void            Ivy_TableProfile( Ivy_Man_t * p );
+/*=== ivyUtil.c =========================================================*/
+extern void            Ivy_ManIncrementTravId( Ivy_Man_t * p );
+extern void            Ivy_ManCleanTravId( Ivy_Man_t * p );
+extern unsigned *      Ivy_ManCutTruth( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Int_t * vLeaves, Vec_Int_t * vNodes, Vec_Int_t * vTruth );
+extern void            Ivy_ManCollectCut( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Int_t * vLeaves, Vec_Int_t * vNodes );
+extern Vec_Int_t *     Ivy_ManLatches( Ivy_Man_t * p );
+extern int             Ivy_ManLevels( Ivy_Man_t * p );
+extern void            Ivy_ManResetLevels( Ivy_Man_t * p );
+extern int             Ivy_ObjMffcLabel( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_ObjUpdateLevel_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj );
+extern void            Ivy_ObjUpdateLevelR_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ReqNew );
+extern int             Ivy_ObjIsMuxType( Ivy_Obj_t * pObj );
+extern Ivy_Obj_t *     Ivy_ObjRecognizeMux( Ivy_Obj_t * pObj, Ivy_Obj_t ** ppObjT, Ivy_Obj_t ** ppObjE );
+extern Ivy_Obj_t *     Ivy_ObjReal( Ivy_Obj_t * pObj );
+extern void            Ivy_ObjPrintVerbose( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fHaig );
+extern void            Ivy_ManPrintVerbose( Ivy_Man_t * p, int fHaig );
+extern int             Ivy_CutTruthPrint( Ivy_Man_t * p, Ivy_Cut_t * pCut, unsigned uTruth );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/ivy/ivyBalance.c b/abc70930/src/aig/ivy/ivyBalance.c
new file mode 100644
index 00000000..5627039a
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyBalance.c
@@ -0,0 +1,404 @@
+/**CFile****************************************************************
+
+  FileName    [ivyBalance.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Algebraic AIG balancing.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyBalance.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static int         Ivy_NodeBalance_rec( Ivy_Man_t * pNew, Ivy_Obj_t * pObj, Vec_Vec_t * vStore, int Level, int fUpdateLevel );
+static Vec_Ptr_t * Ivy_NodeBalanceCone( Ivy_Obj_t * pObj, Vec_Vec_t * vStore, int Level );
+static int         Ivy_NodeBalanceFindLeft( Vec_Ptr_t * vSuper );
+static void        Ivy_NodeBalancePermute( Ivy_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor );
+static void        Ivy_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Ivy_Obj_t * pObj );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs algebraic balancing of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManBalance( Ivy_Man_t * p, int fUpdateLevel )
+{
+    Ivy_Man_t * pNew;
+    Ivy_Obj_t * pObj, * pDriver;
+    Vec_Vec_t * vStore;
+    int i, NewNodeId;
+    // clean the old manager
+    Ivy_ManCleanTravId( p );
+    // create the new manager 
+    pNew = Ivy_ManStart();
+    // map the nodes
+    Ivy_ManConst1(p)->TravId = Ivy_EdgeFromNode( Ivy_ManConst1(pNew) );
+    Ivy_ManForEachPi( p, pObj, i )
+        pObj->TravId = Ivy_EdgeFromNode( Ivy_ObjCreatePi(pNew) );
+    // if HAIG is defined, trasfer the pointers to the PIs/latches
+//    if ( p->pHaig )
+//        Ivy_ManHaigTrasfer( p, pNew );
+    // balance the AIG
+    vStore = Vec_VecAlloc( 50 );
+    Ivy_ManForEachPo( p, pObj, i )
+    {
+        pDriver   = Ivy_ObjReal( Ivy_ObjChild0(pObj) );
+        NewNodeId = Ivy_NodeBalance_rec( pNew, Ivy_Regular(pDriver), vStore, 0, fUpdateLevel );
+        NewNodeId = Ivy_EdgeNotCond( NewNodeId, Ivy_IsComplement(pDriver) );
+        Ivy_ObjCreatePo( pNew, Ivy_EdgeToNode(pNew, NewNodeId) );
+    }
+    Vec_VecFree( vStore );
+    if ( i = Ivy_ManCleanup( pNew ) )
+    {
+//        printf( "Cleanup after balancing removed %d dangling nodes.\n", i );
+    }
+    // check the resulting AIG
+    if ( !Ivy_ManCheck(pNew) )
+        printf( "Ivy_ManBalance(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Procedure used for sorting the nodes in decreasing order of levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCompareLevelsDecrease( Ivy_Obj_t ** pp1, Ivy_Obj_t ** pp2 )
+{
+    int Diff = Ivy_Regular(*pp1)->Level - Ivy_Regular(*pp2)->Level;
+    if ( Diff > 0 )
+        return -1;
+    if ( Diff < 0 ) 
+        return 1;
+    return 0; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the ID of new node constructed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeBalance_rec( Ivy_Man_t * pNew, Ivy_Obj_t * pObjOld, Vec_Vec_t * vStore, int Level, int fUpdateLevel )
+{
+    Ivy_Obj_t * pObjNew;
+    Vec_Ptr_t * vSuper;
+    int i, NewNodeId;
+    assert( !Ivy_IsComplement(pObjOld) );
+    assert( !Ivy_ObjIsBuf(pObjOld) );
+    // return if the result is known
+    if ( Ivy_ObjIsConst1(pObjOld) )
+        return pObjOld->TravId;
+    if ( pObjOld->TravId )
+        return pObjOld->TravId;
+    assert( Ivy_ObjIsNode(pObjOld) );
+    // get the implication supergate
+    vSuper = Ivy_NodeBalanceCone( pObjOld, vStore, Level );
+    if ( vSuper->nSize == 0 )
+    { // it means that the supergate contains two nodes in the opposite polarity
+        pObjOld->TravId = Ivy_EdgeFromNode( Ivy_ManConst0(pNew) );
+        return pObjOld->TravId;
+    }
+    if ( vSuper->nSize < 2 )
+        printf( "BUG!\n" );
+    // for each old node, derive the new well-balanced node
+    for ( i = 0; i < vSuper->nSize; i++ )
+    {
+        NewNodeId = Ivy_NodeBalance_rec( pNew, Ivy_Regular(vSuper->pArray[i]), vStore, Level + 1, fUpdateLevel );
+        NewNodeId = Ivy_EdgeNotCond( NewNodeId, Ivy_IsComplement(vSuper->pArray[i]) );
+        vSuper->pArray[i] = Ivy_EdgeToNode( pNew, NewNodeId );
+    }
+    // build the supergate
+    pObjNew = Ivy_NodeBalanceBuildSuper( pNew, vSuper, Ivy_ObjType(pObjOld), fUpdateLevel );
+    vSuper->nSize = 0;
+    // make sure the balanced node is not assigned
+    assert( pObjOld->TravId == 0 );
+    pObjOld->TravId = Ivy_EdgeFromNode( pObjNew );
+//    assert( pObjOld->Level >= Ivy_Regular(pObjNew)->Level );
+    return pObjOld->TravId;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Builds implication supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_NodeBalanceBuildSuper( Ivy_Man_t * p, Vec_Ptr_t * vSuper, Ivy_Type_t Type, int fUpdateLevel )
+{
+    Ivy_Obj_t * pObj1, * pObj2;
+    int LeftBound;
+    assert( vSuper->nSize > 1 );
+    // sort the new nodes by level in the decreasing order
+    Vec_PtrSort( vSuper, Ivy_NodeCompareLevelsDecrease );
+    // balance the nodes
+    while ( vSuper->nSize > 1 )
+    {
+        // find the left bound on the node to be paired
+        LeftBound = (!fUpdateLevel)? 0 : Ivy_NodeBalanceFindLeft( vSuper );
+        // find the node that can be shared (if no such node, randomize choice)
+        Ivy_NodeBalancePermute( p, vSuper, LeftBound, Type == IVY_EXOR );
+        // pull out the last two nodes
+        pObj1 = Vec_PtrPop(vSuper);
+        pObj2 = Vec_PtrPop(vSuper);
+        Ivy_NodeBalancePushUniqueOrderByLevel( vSuper, Ivy_Oper(p, pObj1, pObj2, Type) );
+    }
+    return Vec_PtrEntry(vSuper, 0);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeBalanceCone_rec( Ivy_Obj_t * pRoot, Ivy_Obj_t * pObj, Vec_Ptr_t * vSuper )
+{
+    int RetValue1, RetValue2, i;
+    // check if the node is visited
+    if ( Ivy_Regular(pObj)->fMarkB )
+    {
+        // check if the node occurs in the same polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == pObj )
+                return 1;
+        // check if the node is present in the opposite polarity
+        for ( i = 0; i < vSuper->nSize; i++ )
+            if ( vSuper->pArray[i] == Ivy_Not(pObj) )
+                return -1;
+        assert( 0 );
+        return 0;
+    }
+    // if the new node is complemented or a PI, another gate begins
+    if ( pObj != pRoot && (Ivy_IsComplement(pObj) || Ivy_ObjType(pObj) != Ivy_ObjType(pRoot) || Ivy_ObjRefs(pObj) > 1) )
+    {
+        Vec_PtrPush( vSuper, pObj );
+        Ivy_Regular(pObj)->fMarkB = 1;
+        return 0;
+    }
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjIsNode(pObj) );
+    // go through the branches
+    RetValue1 = Ivy_NodeBalanceCone_rec( pRoot, Ivy_ObjReal( Ivy_ObjChild0(pObj) ), vSuper );
+    RetValue2 = Ivy_NodeBalanceCone_rec( pRoot, Ivy_ObjReal( Ivy_ObjChild1(pObj) ), vSuper );
+    if ( RetValue1 == -1 || RetValue2 == -1 )
+        return -1;
+    // return 1 if at least one branch has a duplicate
+    return RetValue1 || RetValue2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the nodes of the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Ivy_NodeBalanceCone( Ivy_Obj_t * pObj, Vec_Vec_t * vStore, int Level )
+{
+    Vec_Ptr_t * vNodes;
+    int RetValue, i;
+    assert( !Ivy_IsComplement(pObj) );
+    // extend the storage
+    if ( Vec_VecSize( vStore ) <= Level )
+        Vec_VecPush( vStore, Level, 0 );
+    // get the temporary array of nodes
+    vNodes = Vec_VecEntry( vStore, Level );
+    Vec_PtrClear( vNodes );
+    // collect the nodes in the implication supergate
+    RetValue = Ivy_NodeBalanceCone_rec( pObj, pObj, vNodes );
+    assert( vNodes->nSize > 1 );
+    // unmark the visited nodes
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Ivy_Regular(pObj)->fMarkB = 0;
+    // if we found the node and its complement in the same implication supergate, 
+    // return empty set of nodes (meaning that we should use constant-0 node)
+    if ( RetValue == -1 )
+        vNodes->nSize = 0;
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finds the left bound on the next candidate to be paired.]
+
+  Description [The nodes in the array are in the decreasing order of levels. 
+  The last node in the array has the smallest level. By default it would be paired 
+  with the next node on the left. However, it may be possible to pair it with some
+  other node on the left, in such a way that the new node is shared. This procedure
+  finds the index of the left-most node, which can be paired with the last node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeBalanceFindLeft( Vec_Ptr_t * vSuper )
+{
+    Ivy_Obj_t * pObjRight, * pObjLeft;
+    int Current;
+    // if two or less nodes, pair with the first
+    if ( Vec_PtrSize(vSuper) < 3 )
+        return 0;
+    // set the pointer to the one before the last
+    Current = Vec_PtrSize(vSuper) - 2;
+    pObjRight = Vec_PtrEntry( vSuper, Current );
+    // go through the nodes to the left of this one
+    for ( Current--; Current >= 0; Current-- )
+    {
+        // get the next node on the left
+        pObjLeft = Vec_PtrEntry( vSuper, Current );
+        // if the level of this node is different, quit the loop
+        if ( Ivy_Regular(pObjLeft)->Level != Ivy_Regular(pObjRight)->Level )
+            break;
+    }
+    Current++;    
+    // get the node, for which the equality holds
+    pObjLeft = Vec_PtrEntry( vSuper, Current );
+    assert( Ivy_Regular(pObjLeft)->Level == Ivy_Regular(pObjRight)->Level );
+    return Current;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Moves closer to the end the node that is best for sharing.]
+
+  Description [If there is no node with sharing, randomly chooses one of 
+  the legal nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeBalancePermute( Ivy_Man_t * p, Vec_Ptr_t * vSuper, int LeftBound, int fExor )
+{
+    Ivy_Obj_t * pObj1, * pObj2, * pObj3, * pGhost;
+    int RightBound, i;
+    // get the right bound
+    RightBound = Vec_PtrSize(vSuper) - 2;
+    assert( LeftBound <= RightBound );
+    if ( LeftBound == RightBound )
+        return;
+    // get the two last nodes
+    pObj1 = Vec_PtrEntry( vSuper, RightBound + 1 );
+    pObj2 = Vec_PtrEntry( vSuper, RightBound     );
+    if ( Ivy_Regular(pObj1) == p->pConst1 || Ivy_Regular(pObj2) == p->pConst1 )
+        return;
+    // find the first node that can be shared
+    for ( i = RightBound; i >= LeftBound; i-- )
+    {
+        pObj3 = Vec_PtrEntry( vSuper, i );
+        if ( Ivy_Regular(pObj3) == p->pConst1 )
+        {
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+        pGhost = Ivy_ObjCreateGhost( p, pObj1, pObj3, fExor? IVY_EXOR : IVY_AND, IVY_INIT_NONE );
+        if ( Ivy_TableLookup( p, pGhost ) )
+        {
+            if ( pObj3 == pObj2 )
+                return;
+            Vec_PtrWriteEntry( vSuper, i,          pObj2 );
+            Vec_PtrWriteEntry( vSuper, RightBound, pObj3 );
+            return;
+        }
+    }
+/*
+    // we did not find the node to share, randomize choice
+    {
+        int Choice = rand() % (RightBound - LeftBound + 1);
+        pObj3 = Vec_PtrEntry( vSuper, LeftBound + Choice );
+        if ( pObj3 == pObj2 )
+            return;
+        Vec_PtrWriteEntry( vSuper, LeftBound + Choice, pObj2 );
+        Vec_PtrWriteEntry( vSuper, RightBound,         pObj3 );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts a new node in the order by levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeBalancePushUniqueOrderByLevel( Vec_Ptr_t * vStore, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pObj1, * pObj2;
+    int i;
+    if ( Vec_PtrPushUnique(vStore, pObj) )
+        return;
+    // find the p of the node
+    for ( i = vStore->nSize-1; i > 0; i-- )
+    {
+        pObj1 = vStore->pArray[i  ];
+        pObj2 = vStore->pArray[i-1];
+        if ( Ivy_Regular(pObj1)->Level <= Ivy_Regular(pObj2)->Level )
+            break;
+        vStore->pArray[i  ] = pObj2;
+        vStore->pArray[i-1] = pObj1;
+    }
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyCanon.c b/abc70930/src/aig/ivy/ivyCanon.c
new file mode 100644
index 00000000..5768b87e
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyCanon.c
@@ -0,0 +1,144 @@
+/**CFile****************************************************************
+
+  FileName    [ivyCanon.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Finding canonical form of objects.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyCanon.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Ivy_Obj_t * Ivy_TableLookupPair_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1, int fCompl0, int fCompl1, Ivy_Type_t Type );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_CanonPair_rec( Ivy_Man_t * p, Ivy_Obj_t * pGhost )
+{
+    Ivy_Obj_t * pResult, * pLat0, * pLat1;
+    Ivy_Init_t Init, Init0, Init1;
+    int fCompl0, fCompl1;
+    Ivy_Type_t Type;
+    assert( Ivy_ObjIsNode(pGhost) );
+    assert( Ivy_ObjIsAnd(pGhost) || (!Ivy_ObjFaninC0(pGhost) && !Ivy_ObjFaninC1(pGhost)) );
+    assert( Ivy_ObjFaninId0(pGhost) != 0 && Ivy_ObjFaninId1(pGhost) != 0 );
+    // consider the case when the pair is canonical
+    if ( !Ivy_ObjIsLatch(Ivy_ObjFanin0(pGhost)) || !Ivy_ObjIsLatch(Ivy_ObjFanin1(pGhost)) )
+    {
+        if ( pResult = Ivy_TableLookup( p, pGhost ) )
+            return pResult;
+        return Ivy_ObjCreate( p, pGhost );
+    }
+    /// remember the latches
+    pLat0 = Ivy_ObjFanin0(pGhost);
+    pLat1 = Ivy_ObjFanin1(pGhost);
+    // remember type and compls
+    Type = Ivy_ObjType(pGhost);
+    fCompl0 = Ivy_ObjFaninC0(pGhost);
+    fCompl1 = Ivy_ObjFaninC1(pGhost);
+    // call recursively
+    pResult = Ivy_Oper( p, Ivy_NotCond(Ivy_ObjFanin0(pLat0), fCompl0), Ivy_NotCond(Ivy_ObjFanin0(pLat1), fCompl1), Type );
+    // build latch on top of this
+    Init0 = Ivy_InitNotCond( Ivy_ObjInit(pLat0), fCompl0 );
+    Init1 = Ivy_InitNotCond( Ivy_ObjInit(pLat1), fCompl1 );
+    Init  = (Type == IVY_AND)? Ivy_InitAnd(Init0, Init1) : Ivy_InitExor(Init0, Init1);
+    return Ivy_Latch( p, pResult, Init );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_CanonAnd( Ivy_Man_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1 )
+{
+    Ivy_Obj_t * pGhost, * pResult;
+    pGhost = Ivy_ObjCreateGhost( p, pObj0, pObj1, IVY_AND, IVY_INIT_NONE );
+    pResult = Ivy_CanonPair_rec( p, pGhost );
+    return pResult;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_CanonExor( Ivy_Man_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1 )
+{
+    Ivy_Obj_t * pGhost, * pResult;
+    int fCompl = Ivy_IsComplement(pObj0) ^ Ivy_IsComplement(pObj1);
+    pObj0 = Ivy_Regular(pObj0);
+    pObj1 = Ivy_Regular(pObj1);
+    pGhost = Ivy_ObjCreateGhost( p, pObj0, pObj1, IVY_EXOR, IVY_INIT_NONE );
+    pResult = Ivy_CanonPair_rec( p, pGhost );
+    return Ivy_NotCond( pResult, fCompl );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the canonical form of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_CanonLatch( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Init_t Init )
+{
+    Ivy_Obj_t * pGhost, * pResult;
+    int fCompl = Ivy_IsComplement(pObj);
+    pObj = Ivy_Regular(pObj);
+    pGhost = Ivy_ObjCreateGhost( p, pObj, NULL, IVY_LATCH, Ivy_InitNotCond(Init, fCompl) );
+    pResult = Ivy_TableLookup( p, pGhost );
+    if ( pResult == NULL )
+        pResult = Ivy_ObjCreate( p, pGhost );
+    return Ivy_NotCond( pResult, fCompl );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyCheck.c b/abc70930/src/aig/ivy/ivyCheck.c
new file mode 100644
index 00000000..55448f19
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyCheck.c
@@ -0,0 +1,273 @@
+/**CFile****************************************************************
+
+  FileName    [ivyCheck.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [AIG checking procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyCheck.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Checks the consistency of the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCheck( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj, * pObj2;
+    int i;
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        // skip deleted nodes
+        if ( Ivy_ObjId(pObj) != i )
+        {
+            printf( "Ivy_ManCheck: Node with ID %d is listed as number %d in the array of objects.\n", pObj->Id, i );
+            return 0;
+        }
+        // consider the constant node and PIs
+        if ( i == 0 || Ivy_ObjIsPi(pObj) )
+        {
+            if ( Ivy_ObjFaninId0(pObj) || Ivy_ObjFaninId1(pObj) || Ivy_ObjLevel(pObj) )
+            {
+                printf( "Ivy_ManCheck: The AIG has non-standard constant or PI node with ID \"%d\".\n", pObj->Id );
+                return 0;
+            }
+            continue;
+        }
+        if ( Ivy_ObjIsPo(pObj) )
+        {
+            if ( Ivy_ObjFaninId1(pObj) )
+            {
+                printf( "Ivy_ManCheck: The AIG has non-standard PO node with ID \"%d\".\n", pObj->Id );
+                return 0;
+            }
+            continue;
+        }
+        if ( Ivy_ObjIsBuf(pObj) )
+        {
+            if ( Ivy_ObjFanin1(pObj) )
+            {
+                printf( "Ivy_ManCheck: The buffer with ID \"%d\" contains second fanin.\n", pObj->Id );
+                return 0;
+            }
+            continue;
+        }
+        if ( Ivy_ObjIsLatch(pObj) )
+        {
+            if ( Ivy_ObjFanin1(pObj) )
+            {
+                printf( "Ivy_ManCheck: The latch with ID \"%d\" contains second fanin.\n", pObj->Id );
+                return 0;
+            }
+            if ( Ivy_ObjInit(pObj) == IVY_INIT_NONE )
+            {
+                printf( "Ivy_ManCheck: The latch with ID \"%d\" does not have initial state.\n", pObj->Id );
+                return 0;
+            }
+            pObj2 = Ivy_TableLookup( p, pObj );
+            if ( pObj2 != pObj )
+                printf( "Ivy_ManCheck: Latch with ID \"%d\" is not in the structural hashing table.\n", pObj->Id );
+                continue;
+        }
+        // consider the AND node
+        if ( !Ivy_ObjFanin0(pObj) || !Ivy_ObjFanin1(pObj) )
+        {
+            printf( "Ivy_ManCheck: The AIG has internal node \"%d\" with a NULL fanin.\n", pObj->Id );
+            return 0;
+        }
+        if ( Ivy_ObjFaninId0(pObj) >= Ivy_ObjFaninId1(pObj) )
+        {
+            printf( "Ivy_ManCheck: The AIG has node \"%d\" with a wrong ordering of fanins.\n", pObj->Id );
+            return 0;
+        }
+        if ( Ivy_ObjLevel(pObj) != Ivy_ObjLevelNew(pObj) )
+            printf( "Ivy_ManCheck: Node with ID \"%d\" has level %d but should have level %d.\n", pObj->Id, Ivy_ObjLevel(pObj), Ivy_ObjLevelNew(pObj) );
+        pObj2 = Ivy_TableLookup( p, pObj );
+        if ( pObj2 != pObj )
+            printf( "Ivy_ManCheck: Node with ID \"%d\" is not in the structural hashing table.\n", pObj->Id );
+        if ( Ivy_ObjRefs(pObj) == 0 )
+            printf( "Ivy_ManCheck: Node with ID \"%d\" has no fanouts.\n", pObj->Id );
+        // check fanouts
+        if ( p->fFanout && Ivy_ObjRefs(pObj) != Ivy_ObjFanoutNum(p, pObj) )
+            printf( "Ivy_ManCheck: Node with ID \"%d\" has mismatch between the number of fanouts and refs.\n", pObj->Id );
+    }
+    // count the number of nodes in the table
+    if ( Ivy_TableCountEntries(p) != Ivy_ManAndNum(p) + Ivy_ManExorNum(p) + Ivy_ManLatchNum(p) )
+    {
+        printf( "Ivy_ManCheck: The number of nodes in the structural hashing table is wrong.\n" );
+        return 0;
+    }
+//    if ( !Ivy_ManCheckFanouts(p) )
+//        return 0;
+    if ( !Ivy_ManIsAcyclic(p) )
+        return 0;
+    return 1; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies the fanouts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCheckFanoutNums( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i, Counter = 0;
+    Ivy_ManForEachObj( p, pObj, i )
+        if ( Ivy_ObjIsNode(pObj) )
+            Counter += (Ivy_ObjRefs(pObj) == 0);
+    if ( Counter )
+        printf( "Sequential AIG has %d dangling nodes.\n", Counter );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies the fanouts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCheckFanouts( Ivy_Man_t * p )
+{
+    Vec_Ptr_t * vFanouts;
+    Ivy_Obj_t * pObj, * pFanout, * pFanin;
+    int i, k, RetValue = 1;
+    if ( !p->fFanout )
+        return 1;
+    vFanouts = Vec_PtrAlloc( 100 );
+    // make sure every fanin is a fanout
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        pFanin = Ivy_ObjFanin0(pObj);
+        if ( pFanin == NULL )
+            continue;
+        Ivy_ObjForEachFanout( p, pFanin, vFanouts, pFanout, k )
+            if ( pFanout == pObj )
+                break;
+        if ( k == Vec_PtrSize(vFanouts) )
+        {
+            printf( "Node %d is a fanin of node %d but the fanout is not there.\n", pFanin->Id, pObj->Id );
+            RetValue = 0;
+        }
+
+        pFanin = Ivy_ObjFanin1(pObj);
+        if ( pFanin == NULL )
+            continue;
+        Ivy_ObjForEachFanout( p, pFanin, vFanouts, pFanout, k )
+            if ( pFanout == pObj )
+                break;
+        if ( k == Vec_PtrSize(vFanouts) )
+        {
+            printf( "Node %d is a fanin of node %d but the fanout is not there.\n", pFanin->Id, pObj->Id );
+            RetValue = 0;
+        }
+        // check that the previous fanout has the same fanin
+        if ( pObj->pPrevFan0 )
+        {
+            if ( Ivy_ObjFanin0(pObj->pPrevFan0) != Ivy_ObjFanin0(pObj) && 
+                 Ivy_ObjFanin0(pObj->pPrevFan0) != Ivy_ObjFanin1(pObj) && 
+                 Ivy_ObjFanin1(pObj->pPrevFan0) != Ivy_ObjFanin0(pObj) && 
+                 Ivy_ObjFanin1(pObj->pPrevFan0) != Ivy_ObjFanin1(pObj) )
+            {
+                printf( "Node %d has prev %d without common fanin.\n", pObj->Id, pObj->pPrevFan0->Id );
+                RetValue = 0;
+            }
+        }
+        // check that the previous fanout has the same fanin
+        if ( pObj->pPrevFan1 )
+        {
+            if ( Ivy_ObjFanin0(pObj->pPrevFan1) != Ivy_ObjFanin0(pObj) && 
+                 Ivy_ObjFanin0(pObj->pPrevFan1) != Ivy_ObjFanin1(pObj) && 
+                 Ivy_ObjFanin1(pObj->pPrevFan1) != Ivy_ObjFanin0(pObj) && 
+                 Ivy_ObjFanin1(pObj->pPrevFan1) != Ivy_ObjFanin1(pObj) )
+            {
+                printf( "Node %d has prev %d without common fanin.\n", pObj->Id, pObj->pPrevFan1->Id );
+                RetValue = 0;
+            }
+        }
+    }
+    // make sure every fanout is a fanin
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        Ivy_ObjForEachFanout( p, pObj, vFanouts, pFanout, k )
+            if ( Ivy_ObjFanin0(pFanout) != pObj && Ivy_ObjFanin1(pFanout) != pObj )
+            {
+                printf( "Node %d is a fanout of node %d but the fanin is not there.\n", pFanout->Id, pObj->Id );
+                RetValue = 0;
+            }
+    }
+    Vec_PtrFree( vFanouts );
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks that each choice node has exactly one node with fanouts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCheckChoices( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj, * pTemp;
+    int i;
+    Ivy_ManForEachObj( p->pHaig, pObj, i )
+    {
+        if ( Ivy_ObjRefs(pObj) == 0 )
+            continue;
+        // count the number of nodes in the loop
+        assert( !Ivy_IsComplement(pObj->pEquiv) );
+        for ( pTemp = pObj->pEquiv; pTemp && pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+            if ( Ivy_ObjRefs(pTemp) > 1 )
+                printf( "Node %d has member %d in its equiv class with %d fanouts.\n", pObj->Id, pTemp->Id, Ivy_ObjRefs(pTemp) );
+    }
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyCut.c b/abc70930/src/aig/ivy/ivyCut.c
new file mode 100644
index 00000000..e257d8a6
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyCut.c
@@ -0,0 +1,989 @@
+/**CFile****************************************************************
+
+  FileName    [ivyCut.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Computes reconvergence driven sequential cut.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyCut.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static inline int Ivy_NodeCutHashValue( int NodeId )  { return 1 << (NodeId % 31); }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluate the cost of removing the node from the set of leaves.]
+
+  Description [Returns the number of new leaves that will be brought in.
+  Returns large number if the node cannot be removed from the set of leaves.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_NodeGetLeafCostOne( Ivy_Man_t * p, int Leaf, Vec_Int_t * vInside )
+{
+    Ivy_Obj_t * pNode;
+    int nLatches, FaninLeaf, Cost;
+    // make sure leaf is not a contant node
+    assert( Leaf > 0 ); 
+    // get the node
+    pNode = Ivy_ManObj( p, Ivy_LeafId(Leaf) );
+    // cannot expand over the PI node
+    if ( Ivy_ObjIsPi(pNode) || Ivy_ObjIsConst1(pNode) )
+        return 999;
+    // get the number of latches
+    nLatches = Ivy_LeafLat(Leaf) + Ivy_ObjIsLatch(pNode);
+    if ( nLatches > 15 )
+        return 999;
+    // get the first fanin
+    FaninLeaf = Ivy_LeafCreate( Ivy_ObjFaninId0(pNode), nLatches );
+    Cost = FaninLeaf && (Vec_IntFind(vInside, FaninLeaf) == -1);
+    // quit if this is the one fanin node
+    if ( Ivy_ObjIsLatch(pNode) || Ivy_ObjIsBuf(pNode) )
+        return Cost;
+    assert( Ivy_ObjIsNode(pNode) );
+    // get the second fanin
+    FaninLeaf = Ivy_LeafCreate( Ivy_ObjFaninId1(pNode), nLatches );
+    Cost += FaninLeaf && (Vec_IntFind(vInside, FaninLeaf) == -1);
+    return Cost;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Builds reconvergence-driven cut by changing one leaf at a time.]
+
+  Description [This procedure looks at the current leaves and tries to change 
+  one leaf at a time in such a way that the cut grows as little as possible.
+  In evaluating the fanins, this procedure looks only at their immediate 
+  predecessors (this is why it is called a one-level construction procedure).]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManSeqFindCut_int( Ivy_Man_t * p, Vec_Int_t * vFront, Vec_Int_t * vInside, int nSizeLimit )
+{
+    Ivy_Obj_t * pNode;
+    int CostBest, CostCur, Leaf, LeafBest, Next, nLatches, i;
+    int LeavesBest[10];
+    int Counter;
+
+    // add random selection of the best fanin!!!
+
+    // find the best fanin
+    CostBest = 99;
+    LeafBest = -1;
+    Counter = -1;
+//printf( "Evaluating fanins of the cut:\n" );
+    Vec_IntForEachEntry( vFront, Leaf, i )
+    {
+        CostCur = Ivy_NodeGetLeafCostOne( p, Leaf, vInside );
+//printf( "    Fanin %s has cost %d.\n", Ivy_ObjName(pNode), CostCur );
+        if ( CostBest > CostCur )
+        {
+            CostBest = CostCur;
+            LeafBest = Leaf;
+            LeavesBest[0] = Leaf;
+            Counter = 1;
+        }
+        else if ( CostBest == CostCur )
+            LeavesBest[Counter++] = Leaf;
+
+        if ( CostBest <= 1 ) // can be if ( CostBest <= 1 )
+            break;
+    }
+    if ( CostBest == 99 )
+        return 0;
+//        return Ivy_NodeBuildCutLevelTwo_int( vInside, vFront, nFaninLimit );
+
+    assert( CostBest < 3 );
+    if ( Vec_IntSize(vFront) - 1 + CostBest > nSizeLimit )
+        return 0;
+//        return Ivy_NodeBuildCutLevelTwo_int( vInside, vFront, nFaninLimit );
+
+    assert( Counter > 0 );
+printf( "%d", Counter );
+
+    LeafBest = LeavesBest[rand() % Counter];
+
+    // remove the node from the array
+    assert( LeafBest >= 0 );
+    Vec_IntRemove( vFront, LeafBest );
+//printf( "Removing fanin %s.\n", Ivy_ObjName(pNode) );
+
+    // get the node and its latches
+    pNode = Ivy_ManObj( p, Ivy_LeafId(LeafBest) );
+    nLatches = Ivy_LeafLat(LeafBest) + Ivy_ObjIsLatch(pNode);
+    assert( Ivy_ObjIsNode(pNode) || Ivy_ObjIsLatch(pNode) || Ivy_ObjIsBuf(pNode) );
+
+    // add the left child to the fanins
+    Next = Ivy_LeafCreate( Ivy_ObjFaninId0(pNode), nLatches );
+    if ( Next && Vec_IntFind(vInside, Next) == -1 )
+    {
+//printf( "Adding fanin %s.\n", Ivy_ObjName(pNext) );
+        Vec_IntPush( vFront, Next );
+        Vec_IntPush( vInside, Next );
+    }
+
+    // quit if this is the one fanin node
+    if ( Ivy_ObjIsLatch(pNode) || Ivy_ObjIsBuf(pNode) )
+        return 1;
+    assert( Ivy_ObjIsNode(pNode) );
+
+    // add the right child to the fanins
+    Next = Ivy_LeafCreate( Ivy_ObjFaninId1(pNode), nLatches );
+    if ( Next && Vec_IntFind(vInside, Next) == -1 )
+    {
+//printf( "Adding fanin %s.\n", Ivy_ObjName(pNext) );
+        Vec_IntPush( vFront, Next );
+        Vec_IntPush( vInside, Next );
+    }
+    assert( Vec_IntSize(vFront) <= nSizeLimit );
+    // keep doing this
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes one sequential cut of the given size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManSeqFindCut( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Int_t * vFront, Vec_Int_t * vInside, int nSize )
+{
+    assert( !Ivy_IsComplement(pRoot) );
+    assert( Ivy_ObjIsNode(pRoot) );
+    assert( Ivy_ObjFaninId0(pRoot) );
+    assert( Ivy_ObjFaninId1(pRoot) );
+
+    // start the cut 
+    Vec_IntClear( vFront );
+    Vec_IntPush( vFront, Ivy_LeafCreate(Ivy_ObjFaninId0(pRoot), 0) );
+    Vec_IntPush( vFront, Ivy_LeafCreate(Ivy_ObjFaninId1(pRoot), 0) );
+
+    // start the visited nodes
+    Vec_IntClear( vInside );
+    Vec_IntPush( vInside, Ivy_LeafCreate(pRoot->Id, 0) );
+    Vec_IntPush( vInside, Ivy_LeafCreate(Ivy_ObjFaninId0(pRoot), 0) );
+    Vec_IntPush( vInside, Ivy_LeafCreate(Ivy_ObjFaninId1(pRoot), 0) );
+
+    // compute the cut
+    while ( Ivy_ManSeqFindCut_int( p, vFront, vInside, nSize ) );
+    assert( Vec_IntSize(vFront) <= nSize );
+}
+
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computing Boolean cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindBoolCut_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vVolume, Ivy_Obj_t * pPivot )
+{
+    int RetValue0, RetValue1;
+    if ( pObj == pPivot )
+    {
+        Vec_PtrPushUnique( vLeaves, pObj );
+        Vec_PtrPushUnique( vVolume, pObj );
+        return 1;        
+    }
+    if ( pObj->fMarkA )
+        return 0;
+
+//    assert( !Ivy_ObjIsCi(pObj) );
+    if ( Ivy_ObjIsCi(pObj) )
+        return 0;
+
+    if ( Ivy_ObjIsBuf(pObj) )
+    {
+        RetValue0 = Ivy_ManFindBoolCut_rec( p, Ivy_ObjFanin0(pObj), vLeaves, vVolume, pPivot );
+        if ( !RetValue0 )
+            return 0;
+        Vec_PtrPushUnique( vVolume, pObj );
+        return 1;
+    }
+    assert( Ivy_ObjIsNode(pObj) );
+    RetValue0 = Ivy_ManFindBoolCut_rec( p, Ivy_ObjFanin0(pObj), vLeaves, vVolume, pPivot );
+    RetValue1 = Ivy_ManFindBoolCut_rec( p, Ivy_ObjFanin1(pObj), vLeaves, vVolume, pPivot );
+    if ( !RetValue0 && !RetValue1 )
+        return 0;
+    // add new leaves
+    if ( !RetValue0 )
+    {
+        Vec_PtrPushUnique( vLeaves, Ivy_ObjFanin0(pObj) );
+        Vec_PtrPushUnique( vVolume, Ivy_ObjFanin0(pObj) );
+    }
+    if ( !RetValue1 )
+    {
+        Vec_PtrPushUnique( vLeaves, Ivy_ObjFanin1(pObj) );
+        Vec_PtrPushUnique( vVolume, Ivy_ObjFanin1(pObj) );
+    }
+    Vec_PtrPushUnique( vVolume, pObj );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the cost of one node (how many new nodes are added.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindBoolCutCost( Ivy_Obj_t * pObj )
+{
+    int Cost;
+    // make sure the node is in the construction zone
+    assert( pObj->fMarkA == 1 );  
+    // cannot expand over the PI node
+    if ( Ivy_ObjIsCi(pObj) )
+        return 999;
+    // always expand over the buffer
+    if ( Ivy_ObjIsBuf(pObj) )
+        return !Ivy_ObjFanin0(pObj)->fMarkA;
+    // get the cost of the cone
+    Cost = (!Ivy_ObjFanin0(pObj)->fMarkA) + (!Ivy_ObjFanin1(pObj)->fMarkA);
+    // return the number of nodes to be added to the leaves if this node is removed
+    return Cost;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computing Boolean cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindBoolCut( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Ptr_t * vFront, Vec_Ptr_t * vVolume, Vec_Ptr_t * vLeaves )
+{
+    Ivy_Obj_t * pObj, * pFaninC, * pFanin0, * pFanin1, * pPivot;
+    int RetValue, LevelLimit, Lev, k;
+    assert( !Ivy_IsComplement(pRoot) );
+    // clear the frontier and collect the nodes
+    Vec_PtrClear( vFront );
+    Vec_PtrClear( vVolume );
+    if ( Ivy_ObjIsMuxType(pRoot) )
+        pFaninC = Ivy_ObjRecognizeMux( pRoot, &pFanin0, &pFanin1 );
+    else
+    {
+        pFaninC = NULL;
+        pFanin0 = Ivy_ObjFanin0(pRoot);
+        pFanin1 = Ivy_ObjFanin1(pRoot); 
+    }
+    // start cone A
+    pFanin0->fMarkA = 1;
+    Vec_PtrPush( vFront, pFanin0 );
+    Vec_PtrPush( vVolume, pFanin0 );
+    // start cone B
+    pFanin1->fMarkB = 1;
+    Vec_PtrPush( vFront, pFanin1 );
+    Vec_PtrPush( vVolume, pFanin1 );
+    // iteratively expand until the common node (pPivot) is found or limit is reached
+    assert( Ivy_ObjLevel(pRoot) == Ivy_ObjLevelNew(pRoot) );
+    pPivot = NULL;
+    LevelLimit = IVY_MAX( Ivy_ObjLevel(pRoot) - 10, 1 );
+    for ( Lev = Ivy_ObjLevel(pRoot) - 1; Lev >= LevelLimit; Lev-- )
+    {
+        while ( 1 )
+        {
+            // find the next node to expand on this level
+            Vec_PtrForEachEntry( vFront, pObj, k )
+                if ( (int)pObj->Level == Lev )
+                    break;
+            if ( k == Vec_PtrSize(vFront) )
+                break;
+            assert( (int)pObj->Level <= Lev );
+            assert( pObj->fMarkA ^ pObj->fMarkB );
+            // remove the old node
+            Vec_PtrRemove( vFront, pObj );
+
+            // expand this node
+            pFanin0 = Ivy_ObjFanin0(pObj);
+            if ( !pFanin0->fMarkA && !pFanin0->fMarkB )
+            {
+                Vec_PtrPush( vFront, pFanin0 );
+                Vec_PtrPush( vVolume, pFanin0 );
+            }
+            // mark the new nodes
+            if ( pObj->fMarkA )
+                pFanin0->fMarkA = 1; 
+            if ( pObj->fMarkB )
+                pFanin0->fMarkB = 1; 
+
+            if ( Ivy_ObjIsBuf(pObj) )
+            {
+                if ( pFanin0->fMarkA && pFanin0->fMarkB )
+                {
+                    pPivot = pFanin0;
+                    break;
+                }
+                continue;
+            }
+
+            // expand this node
+            pFanin1 = Ivy_ObjFanin1(pObj); 
+            if ( !pFanin1->fMarkA && !pFanin1->fMarkB )
+            {
+                Vec_PtrPush( vFront, pFanin1 );
+                Vec_PtrPush( vVolume, pFanin1 );
+            }
+            // mark the new nodes
+            if ( pObj->fMarkA )
+                pFanin1->fMarkA = 1; 
+            if ( pObj->fMarkB )
+                pFanin1->fMarkB = 1; 
+
+            // consider if it is time to quit
+            if ( pFanin0->fMarkA && pFanin0->fMarkB )
+            {
+                pPivot = pFanin0;
+                break;
+            }
+            if ( pFanin1->fMarkA && pFanin1->fMarkB )
+            {
+                pPivot = pFanin1;
+                break;
+            }
+        }
+        if ( pPivot != NULL )
+            break;
+    }
+    if ( pPivot == NULL )
+        return 0;
+    // if the MUX control is defined, it should not be
+    if ( pFaninC && !pFaninC->fMarkA && !pFaninC->fMarkB )
+        Vec_PtrPush( vFront, pFaninC );
+    // clean the markings
+    Vec_PtrForEachEntry( vVolume, pObj, k )
+        pObj->fMarkA = pObj->fMarkB = 0;
+
+    // mark the nodes on the frontier (including the pivot)
+    Vec_PtrForEachEntry( vFront, pObj, k )
+        pObj->fMarkA = 1;
+    // cut exists, collect all the nodes on the shortest path to the pivot
+    Vec_PtrClear( vLeaves );
+    Vec_PtrClear( vVolume );
+    RetValue = Ivy_ManFindBoolCut_rec( p, pRoot, vLeaves, vVolume, pPivot );
+    assert( RetValue == 1 );
+    // unmark the nodes on the frontier (including the pivot)
+    Vec_PtrForEachEntry( vFront, pObj, k )
+        pObj->fMarkA = 0;
+
+    // mark the nodes in the volume
+    Vec_PtrForEachEntry( vVolume, pObj, k )
+        pObj->fMarkA = 1;
+    // expand the cut without increasing its size
+    while ( 1 )
+    {
+        Vec_PtrForEachEntry( vLeaves, pObj, k )
+            if ( Ivy_ManFindBoolCutCost(pObj) < 2 )
+                break;
+        if ( k == Vec_PtrSize(vLeaves) )
+            break;
+        // the node can be expanded
+        // remove the old node
+        Vec_PtrRemove( vLeaves, pObj );
+        // expand this node
+        pFanin0 = Ivy_ObjFanin0(pObj);
+        if ( !pFanin0->fMarkA )
+        {
+            pFanin0->fMarkA = 1;
+            Vec_PtrPush( vVolume, pFanin0 );
+            Vec_PtrPush( vLeaves, pFanin0 );
+        }
+        if ( Ivy_ObjIsBuf(pObj) )
+            continue;
+        // expand this node
+        pFanin1 = Ivy_ObjFanin1(pObj);
+        if ( !pFanin1->fMarkA )
+        {
+            pFanin1->fMarkA = 1;
+            Vec_PtrPush( vVolume, pFanin1 );
+            Vec_PtrPush( vLeaves, pFanin1 );
+        }        
+    }
+    // unmark the nodes in the volume
+    Vec_PtrForEachEntry( vVolume, pObj, k )
+        pObj->fMarkA = 0;
+    return 1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManTestCutsBool( Ivy_Man_t * p )
+{
+    Vec_Ptr_t * vFront, * vVolume, * vLeaves;
+    Ivy_Obj_t * pObj;//, * pTemp;
+    int i, RetValue;//, k;
+    vFront = Vec_PtrAlloc( 100 );
+    vVolume = Vec_PtrAlloc( 100 );
+    vLeaves = Vec_PtrAlloc( 100 );
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( !Ivy_ObjIsNode(pObj) )
+            continue;
+        if ( Ivy_ObjIsMuxType(pObj) )
+        {
+            printf( "m" );
+            continue;
+        }
+        if ( Ivy_ObjIsExor(pObj) )
+            printf( "x" );
+        RetValue = Ivy_ManFindBoolCut( p, pObj, vFront, vVolume, vLeaves );
+        if ( RetValue == 0 )
+            printf( "- " );
+        else
+            printf( "%d ", Vec_PtrSize(vLeaves) );
+/*        
+        printf( "( " );
+        Vec_PtrForEachEntry( vFront, pTemp, k )
+            printf( "%d ", Ivy_ObjRefs(Ivy_Regular(pTemp)) );
+        printf( ")\n" );
+*/
+    }
+    printf( "\n" );
+    Vec_PtrFree( vFront );
+    Vec_PtrFree( vVolume );
+    Vec_PtrFree( vLeaves );
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Find the hash value of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Ivy_NodeCutHash( Ivy_Cut_t * pCut )
+{
+    int i;
+//    for ( i = 1; i < pCut->nSize; i++ )
+//        assert( pCut->pArray[i-1] < pCut->pArray[i] );
+    pCut->uHash = 0;
+    for ( i = 0; i < pCut->nSize; i++ )
+        pCut->uHash |= (1 << (pCut->pArray[i] % 31));
+    return pCut->uHash;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes one node to the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Ivy_NodeCutShrink( Ivy_Cut_t * pCut, int iOld )
+{
+    int i, k;
+    for ( i = k = 0; i < pCut->nSize; i++ )
+        if ( pCut->pArray[i] != iOld )
+            pCut->pArray[k++] = pCut->pArray[i];
+    assert( k == pCut->nSize - 1 );
+    pCut->nSize--;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node to the cut.]
+
+  Description [Returns 1 if the cuts is still okay.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_NodeCutExtend( Ivy_Cut_t * pCut, int iNew )
+{
+    int i;
+    for ( i = 0; i < pCut->nSize; i++ )
+        if ( pCut->pArray[i] == iNew )
+            return 1;
+    // check if there is room
+    if ( pCut->nSize == pCut->nSizeMax )
+        return 0;
+    // add the new one
+    for ( i = pCut->nSize - 1; i >= 0; i-- )
+        if ( pCut->pArray[i] > iNew )
+            pCut->pArray[i+1] = pCut->pArray[i];
+        else
+        {
+            assert( pCut->pArray[i] < iNew );
+            break;
+        }
+    pCut->pArray[i+1] = iNew;
+    pCut->nSize++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the cut can be constructed; 0 otherwise.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_NodeCutPrescreen( Ivy_Cut_t * pCut, int Id0, int Id1 )
+{
+    int i;
+    if ( pCut->nSize < pCut->nSizeMax )
+        return 1;
+    for ( i = 0; i < pCut->nSize; i++ )
+        if ( pCut->pArray[i] == Id0 || pCut->pArray[i] == Id1 )
+            return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives new cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_NodeCutDeriveNew( Ivy_Cut_t * pCut, Ivy_Cut_t * pCutNew, int IdOld, int IdNew0, int IdNew1 )
+{
+    unsigned uHash = 0;
+    int i, k; 
+    assert( pCut->nSize > 0 );
+    assert( IdNew0 < IdNew1 );
+    for ( i = k = 0; i < pCut->nSize; i++ )
+    {
+        if ( pCut->pArray[i] == IdOld )
+            continue;
+        if ( IdNew0 <= pCut->pArray[i] )
+        {
+            if ( IdNew0 < pCut->pArray[i] )
+            {
+                pCutNew->pArray[ k++ ] = IdNew0;
+                uHash |= Ivy_NodeCutHashValue( IdNew0 );
+            }
+            IdNew0 = 0x7FFFFFFF;
+        }
+        if ( IdNew1 <= pCut->pArray[i] )
+        {
+            if ( IdNew1 < pCut->pArray[i] )
+            {
+                pCutNew->pArray[ k++ ] = IdNew1;
+                uHash |= Ivy_NodeCutHashValue( IdNew1 );
+            }
+            IdNew1 = 0x7FFFFFFF;
+        }
+        pCutNew->pArray[ k++ ] = pCut->pArray[i];
+        uHash |= Ivy_NodeCutHashValue( pCut->pArray[i] );
+    }
+    if ( IdNew0 < 0x7FFFFFFF )
+    {
+        pCutNew->pArray[ k++ ] = IdNew0;
+        uHash |= Ivy_NodeCutHashValue( IdNew0 );
+    }
+    if ( IdNew1 < 0x7FFFFFFF )
+    {
+        pCutNew->pArray[ k++ ] = IdNew1;
+        uHash |= Ivy_NodeCutHashValue( IdNew1 );
+    }
+    pCutNew->nSize = k;
+    pCutNew->uHash = uHash;
+    assert( pCutNew->nSize <= pCut->nSizeMax );
+//    for ( i = 1; i < pCutNew->nSize; i++ )
+//        assert( pCutNew->pArray[i-1] < pCutNew->pArray[i] );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check if the cut exists.]
+
+  Description [Returns 1 if the cut exists.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCutFindOrAdd( Ivy_Store_t * pCutStore, Ivy_Cut_t * pCutNew )
+{
+    Ivy_Cut_t * pCut;
+    int i, k;
+    assert( pCutNew->uHash );
+    // try to find the cut
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+    {
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->uHash == pCutNew->uHash && pCut->nSize == pCutNew->nSize )
+        {
+            for ( k = 0; k < pCutNew->nSize; k++ )
+                if ( pCut->pArray[k] != pCutNew->pArray[k] )
+                    break;
+            if ( k == pCutNew->nSize )
+                return 1;
+        }
+    }
+    assert( pCutStore->nCuts < pCutStore->nCutsMax );
+    // add the cut
+    pCut = pCutStore->pCuts + pCutStore->nCuts++;
+    *pCut = *pCutNew;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pDom is contained in pCut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutCheckDominance( Ivy_Cut_t * pDom, Ivy_Cut_t * pCut )
+{
+    int i, k;
+    for ( i = 0; i < pDom->nSize; i++ )
+    {
+        for ( k = 0; k < pCut->nSize; k++ )
+            if ( pDom->pArray[i] == pCut->pArray[k] )
+                break;
+        if ( k == pCut->nSize ) // node i in pDom is not contained in pCut
+            return 0;
+    }
+    // every node in pDom is contained in pCut
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check if the cut exists.]
+
+  Description [Returns 1 if the cut exists.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCutFindOrAddFilter( Ivy_Store_t * pCutStore, Ivy_Cut_t * pCutNew )
+{
+    Ivy_Cut_t * pCut;
+    int i, k;
+    assert( pCutNew->uHash );
+    // try to find the cut
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+    {
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        if ( pCut->nSize == pCutNew->nSize )
+        {
+            if ( pCut->uHash == pCutNew->uHash )
+            {
+                for ( k = 0; k < pCutNew->nSize; k++ )
+                    if ( pCut->pArray[k] != pCutNew->pArray[k] )
+                        break;
+                if ( k == pCutNew->nSize )
+                    return 1;
+            }
+            continue;
+        }
+        if ( pCut->nSize < pCutNew->nSize )
+        {
+            // skip the non-contained cuts
+            if ( (pCut->uHash & pCutNew->uHash) != pCut->uHash )
+                continue;
+            // check containment seriously
+            if ( Ivy_CutCheckDominance( pCut, pCutNew ) )
+                return 1;
+            continue;
+        }
+        // check potential containment of other cut
+
+        // skip the non-contained cuts
+        if ( (pCut->uHash & pCutNew->uHash) != pCutNew->uHash )
+            continue;
+        // check containment seriously
+        if ( Ivy_CutCheckDominance( pCutNew, pCut ) )
+        {
+            // remove the current cut
+//            --pCutStore->nCuts;
+//            for ( k = i; k < pCutStore->nCuts; k++ )
+//                pCutStore->pCuts[k] = pCutStore->pCuts[k+1];
+//            i--;
+            pCut->nSize = 0;
+        }
+    }
+    assert( pCutStore->nCuts < pCutStore->nCutsMax );
+    // add the cut
+    pCut = pCutStore->pCuts + pCutStore->nCuts++;
+    *pCut = *pCutNew;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeCompactCuts( Ivy_Store_t * pCutStore )
+{
+    Ivy_Cut_t * pCut;
+    int i, k;
+    for ( i = k = 0; i < pCutStore->nCuts; i++ )
+    {
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        pCutStore->pCuts[k++] = *pCut;
+    }
+    pCutStore->nCuts = k;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodePrintCut( Ivy_Cut_t * pCut )
+{
+    int i;
+    assert( pCut->nSize > 0 );
+    printf( "%d : {", pCut->nSize );
+    for ( i = 0; i < pCut->nSize; i++ )
+        printf( " %d", pCut->pArray[i] );
+    printf( " }\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodePrintCuts( Ivy_Store_t * pCutStore )
+{
+    int i;
+    printf( "Node %d\n", pCutStore->pCuts[0].pArray[0] );
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+        Ivy_NodePrintCut( pCutStore->pCuts + i );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Ivy_Obj_t * Ivy_ObjRealFanin( Ivy_Obj_t * pObj )
+{
+    if ( !Ivy_ObjIsBuf(pObj) )
+        return pObj;
+    return Ivy_ObjRealFanin( Ivy_ObjFanin0(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Store_t * Ivy_NodeFindCutsAll( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves )
+{
+    static Ivy_Store_t CutStore, * pCutStore = &CutStore;
+    Ivy_Cut_t CutNew, * pCutNew = &CutNew, * pCut;
+    Ivy_Obj_t * pLeaf;
+    int i, k, iLeaf0, iLeaf1;
+
+    assert( nLeaves <= IVY_CUT_INPUT );
+
+    // start the structure
+    pCutStore->nCuts = 0;
+    pCutStore->nCutsMax = IVY_CUT_LIMIT;
+    // start the trivial cut
+    pCutNew->uHash = 0;
+    pCutNew->nSize = 1;
+    pCutNew->nSizeMax = nLeaves;
+    pCutNew->pArray[0] = pObj->Id;
+    Ivy_NodeCutHash( pCutNew );
+    // add the trivial cut
+    Ivy_NodeCutFindOrAdd( pCutStore, pCutNew );
+    assert( pCutStore->nCuts == 1 );
+
+    // explore the cuts
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+    {
+        // expand this cut
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        for ( k = 0; k < pCut->nSize; k++ )
+        {
+            pLeaf = Ivy_ManObj( p, pCut->pArray[k] );
+            if ( Ivy_ObjIsCi(pLeaf) )
+                continue;
+/*
+            *pCutNew = *pCut;
+            Ivy_NodeCutShrink( pCutNew, pLeaf->Id );
+            if ( !Ivy_NodeCutExtend( pCutNew, Ivy_ObjFaninId0(pLeaf) ) )
+                continue;
+            if ( Ivy_ObjIsNode(pLeaf) && !Ivy_NodeCutExtend( pCutNew, Ivy_ObjFaninId1(pLeaf) ) )
+                continue;
+            Ivy_NodeCutHash( pCutNew );
+*/
+            iLeaf0 = Ivy_ObjId( Ivy_ObjRealFanin(Ivy_ObjFanin0(pLeaf)) );
+            iLeaf1 = Ivy_ObjId( Ivy_ObjRealFanin(Ivy_ObjFanin1(pLeaf)) );
+//            if ( iLeaf0 == iLeaf1 ) // strange situation observed on Jan 18, 2007
+//                continue;
+            if ( !Ivy_NodeCutPrescreen( pCut, iLeaf0, iLeaf1 ) )
+                continue;
+            if ( iLeaf0 > iLeaf1 )
+                Ivy_NodeCutDeriveNew( pCut, pCutNew, pCut->pArray[k], iLeaf1, iLeaf0 );
+            else
+                Ivy_NodeCutDeriveNew( pCut, pCutNew, pCut->pArray[k], iLeaf0, iLeaf1 );
+            Ivy_NodeCutFindOrAddFilter( pCutStore, pCutNew );
+            if ( pCutStore->nCuts == IVY_CUT_LIMIT )
+                break;
+        }
+        if ( pCutStore->nCuts == IVY_CUT_LIMIT )
+            break;
+    }
+    Ivy_NodeCompactCuts( pCutStore );
+//    Ivy_NodePrintCuts( pCutStore );
+    return pCutStore;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManTestCutsAll( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i, nCutsCut, nCutsTotal, nNodeTotal, nNodeOver;
+    int clk = clock();
+    nNodeTotal = nNodeOver = 0;
+    nCutsTotal = -Ivy_ManNodeNum(p);
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( !Ivy_ObjIsNode(pObj) )
+            continue;
+        nCutsCut    = Ivy_NodeFindCutsAll( p, pObj, 5 )->nCuts;
+        nCutsTotal += nCutsCut;
+        nNodeOver  += (nCutsCut == IVY_CUT_LIMIT);
+        nNodeTotal++;
+    }
+    printf( "Total cuts = %6d. Trivial = %6d.   Nodes = %6d. Satur = %6d.  ", 
+        nCutsTotal, Ivy_ManPiNum(p) + Ivy_ManNodeNum(p), nNodeTotal, nNodeOver );
+    PRT( "Time", clock() - clk );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyCutTrav.c b/abc70930/src/aig/ivy/ivyCutTrav.c
new file mode 100644
index 00000000..ea57c9f5
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyCutTrav.c
@@ -0,0 +1,473 @@
+/**CFile****************************************************************
+
+  FileName    [ivyCutTrav.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyCutTrav.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static unsigned * Ivy_NodeCutElementary( Vec_Int_t * vStore, int nWords, int NodeId );
+static void Ivy_NodeComputeVolume( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront );
+static void Ivy_NodeFindCutsMerge( Vec_Ptr_t * vCuts0, Vec_Ptr_t * vCuts1, Vec_Ptr_t * vCuts, int nLeaves, int nWords, Vec_Int_t * vStore );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes cuts for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Store_t * Ivy_NodeFindCutsTravAll( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves, int nNodeLimit, 
+                                      Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront, Vec_Int_t * vStore, Vec_Vec_t * vBitCuts )
+{
+    static Ivy_Store_t CutStore, * pCutStore = &CutStore;
+    Vec_Ptr_t * vCuts, * vCuts0, * vCuts1;
+    unsigned * pBitCut;
+    Ivy_Obj_t * pLeaf;
+    Ivy_Cut_t * pCut;
+    int i, k, nWords, nNodes;
+
+    assert( nLeaves <= IVY_CUT_INPUT );
+
+    // find the given number of nodes in the TFI
+    Ivy_NodeComputeVolume( pObj, nNodeLimit - 1, vNodes, vFront );
+    nNodes = Vec_PtrSize(vNodes);
+//    assert( nNodes <= nNodeLimit );
+
+    // make sure vBitCuts has enough room
+    Vec_VecExpand( vBitCuts, nNodes-1 );
+    Vec_VecClear( vBitCuts );
+
+    // prepare the memory manager
+    Vec_IntClear( vStore );
+    Vec_IntGrow( vStore, 64000 );
+
+    // set elementary cuts for the leaves
+    nWords = Extra_BitWordNum( nNodes );
+    Vec_PtrForEachEntry( vFront, pLeaf, i )
+    {
+        assert( Ivy_ObjTravId(pLeaf) < nNodes );
+        // get the new bitcut
+        pBitCut = Ivy_NodeCutElementary( vStore, nWords, Ivy_ObjTravId(pLeaf) );
+        // set it as the cut of this leaf
+        Vec_VecPush( vBitCuts, Ivy_ObjTravId(pLeaf), pBitCut );
+    }
+
+    // compute the cuts for each node
+    Vec_PtrForEachEntry( vNodes, pLeaf, i )
+    {
+        // skip the leaves
+        vCuts = Vec_VecEntry( vBitCuts, Ivy_ObjTravId(pLeaf) );
+        if ( Vec_PtrSize(vCuts) > 0 )
+            continue;
+        // add elementary cut
+        pBitCut = Ivy_NodeCutElementary( vStore, nWords, Ivy_ObjTravId(pLeaf) );
+        // set it as the cut of this leaf
+        Vec_VecPush( vBitCuts, Ivy_ObjTravId(pLeaf), pBitCut );
+        // get the fanin cuts
+        vCuts0 = Vec_VecEntry( vBitCuts, Ivy_ObjTravId( Ivy_ObjFanin0(pLeaf) ) );
+        vCuts1 = Vec_VecEntry( vBitCuts, Ivy_ObjTravId( Ivy_ObjFanin1(pLeaf) ) );
+        assert( Vec_PtrSize(vCuts0) > 0 );
+        assert( Vec_PtrSize(vCuts1) > 0 );
+        // merge the cuts
+        Ivy_NodeFindCutsMerge( vCuts0, vCuts1, vCuts, nLeaves, nWords, vStore );
+    }
+
+    // start the structure
+    pCutStore->nCuts = 0;
+    pCutStore->nCutsMax = IVY_CUT_LIMIT;
+    // collect the cuts of the root node
+    vCuts = Vec_VecEntry( vBitCuts, Ivy_ObjTravId(pObj) );
+    Vec_PtrForEachEntry( vCuts, pBitCut, i )
+    {
+        pCut = pCutStore->pCuts + pCutStore->nCuts++;
+        pCut->nSize = 0;
+        pCut->nSizeMax = nLeaves;
+        pCut->uHash = 0;
+        for ( k = 0; k < nNodes; k++ )
+            if ( Extra_TruthHasBit(pBitCut, k) )
+                pCut->pArray[ pCut->nSize++ ] = Ivy_ObjId( Vec_PtrEntry(vNodes, k) );
+        assert( pCut->nSize <= nLeaves );
+        if ( pCutStore->nCuts == pCutStore->nCutsMax )
+            break;
+    }
+
+    // clean the travIds
+    Vec_PtrForEachEntry( vNodes, pLeaf, i )
+        pLeaf->TravId = 0;
+    return pCutStore;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates elementary bit-cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Ivy_NodeCutElementary( Vec_Int_t * vStore, int nWords, int NodeId )
+{
+    unsigned * pBitCut;
+    pBitCut = Vec_IntFetch( vStore, nWords );
+    memset( pBitCut, 0, 4 * nWords );
+    Extra_TruthSetBit( pBitCut, NodeId );
+    return pBitCut;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compares the node by level.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_CompareNodesByLevel( Ivy_Obj_t ** ppObj1, Ivy_Obj_t ** ppObj2 )
+{
+    Ivy_Obj_t * pObj1 = *ppObj1;
+    Ivy_Obj_t * pObj2 = *ppObj2;
+    if ( pObj1->Level < pObj2->Level )
+        return -1;
+    if ( pObj1->Level > pObj2->Level )
+        return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Mark all nodes up to the given depth.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeComputeVolumeTrav1_rec( Ivy_Obj_t * pObj, int Depth )
+{
+    if ( Ivy_ObjIsCi(pObj) || Depth == 0 )
+        return;
+    Ivy_NodeComputeVolumeTrav1_rec( Ivy_ObjFanin0(pObj), Depth - 1 );
+    Ivy_NodeComputeVolumeTrav1_rec( Ivy_ObjFanin1(pObj), Depth - 1 );
+    pObj->fMarkA = 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the marked nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeComputeVolumeTrav2_rec( Ivy_Obj_t * pObj, Vec_Ptr_t * vNodes )
+{
+    if ( !pObj->fMarkA )
+        return;
+    Ivy_NodeComputeVolumeTrav2_rec( Ivy_ObjFanin0(pObj), vNodes );
+    Ivy_NodeComputeVolumeTrav2_rec( Ivy_ObjFanin1(pObj), vNodes );
+    Vec_PtrPush( vNodes, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeComputeVolume( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pTemp, * pFanin;
+    int i, nNodes;
+    // mark nodes up to the given depth
+    Ivy_NodeComputeVolumeTrav1_rec( pObj, 6 );
+    // collect the marked nodes
+    Vec_PtrClear( vFront );
+    Ivy_NodeComputeVolumeTrav2_rec( pObj, vFront );
+    // find the fanins that are not marked
+    Vec_PtrClear( vNodes );
+    Vec_PtrForEachEntry( vFront, pTemp, i )
+    {
+        pFanin = Ivy_ObjFanin0(pTemp);
+        if ( !pFanin->fMarkA )
+        {
+            pFanin->fMarkA = 1;
+            Vec_PtrPush( vNodes, pFanin );
+        }
+        pFanin = Ivy_ObjFanin1(pTemp);
+        if ( !pFanin->fMarkA )
+        {
+            pFanin->fMarkA = 1;
+            Vec_PtrPush( vNodes, pFanin );
+        }
+    }
+    // remember the number of nodes in the frontier
+    nNodes = Vec_PtrSize( vNodes );
+    // add the remaining nodes
+    Vec_PtrForEachEntry( vFront, pTemp, i )
+        Vec_PtrPush( vNodes, pTemp );
+    // unmark the nodes
+    Vec_PtrForEachEntry( vNodes, pTemp, i )
+    {
+        pTemp->fMarkA = 0;
+        pTemp->TravId = i;
+    }
+    // collect the frontier nodes
+    Vec_PtrClear( vFront );
+    Vec_PtrForEachEntryStop( vNodes, pTemp, i, nNodes )
+        Vec_PtrPush( vFront, pTemp );
+//    printf( "%d ", Vec_PtrSize(vNodes) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeComputeVolume2( Ivy_Obj_t * pObj, int nNodeLimit, Vec_Ptr_t * vNodes, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pLeaf, * pPivot, * pFanin;
+    int LevelMax, i;
+    assert( Ivy_ObjIsNode(pObj) );
+    // clear arrays
+    Vec_PtrClear( vNodes );
+    Vec_PtrClear( vFront );
+    // add the root
+    pObj->fMarkA = 1;
+    Vec_PtrPush( vNodes, pObj );
+    Vec_PtrPush( vFront, pObj );
+    // expand node with maximum level
+    LevelMax = pObj->Level;
+    do {
+        // get the node to expand
+        pPivot = NULL;
+        Vec_PtrForEachEntryReverse( vFront, pLeaf, i )
+        {
+            if ( (int)pLeaf->Level == LevelMax )
+            {
+                pPivot = pLeaf;
+                break;
+            }
+        }
+        // decrease level if we did not find the node
+        if ( pPivot == NULL )
+        {
+            if ( --LevelMax == 0 )
+                break;
+            continue;
+        }
+        // the node to expand is found
+        // remove it from frontier
+        Vec_PtrRemove( vFront, pPivot );
+        // add fanins
+        pFanin = Ivy_ObjFanin0(pPivot); 
+        if ( !pFanin->fMarkA )
+        {
+            pFanin->fMarkA = 1;
+            Vec_PtrPush( vNodes, pFanin );
+            Vec_PtrPush( vFront, pFanin );
+        }
+        pFanin = Ivy_ObjFanin1(pPivot); 
+        if ( pFanin && !pFanin->fMarkA )
+        {
+            pFanin->fMarkA = 1;
+            Vec_PtrPush( vNodes, pFanin );
+            Vec_PtrPush( vFront, pFanin );
+        }
+        // quit if we collected enough nodes
+    } while ( Vec_PtrSize(vNodes) < nNodeLimit );
+
+    // sort nodes by level
+    Vec_PtrSort( vNodes, Ivy_CompareNodesByLevel );
+    // make sure the nodes are ordered in the increasing number of levels
+    pFanin = Vec_PtrEntry( vNodes, 0 );
+    pPivot = Vec_PtrEntryLast( vNodes );
+    assert( pFanin->Level <= pPivot->Level );
+
+    // clean the marks and remember node numbers in the TravId
+    Vec_PtrForEachEntry( vNodes, pFanin, i )
+    {
+        pFanin->fMarkA = 0;
+        pFanin->TravId = i;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Extra_TruthOrWords( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nWords )
+{
+    int w;
+    for ( w = nWords-1; w >= 0; w-- )
+        pOut[w] = pIn0[w] | pIn1[w];
+}
+static inline int Extra_TruthIsImplyWords( unsigned * pIn1, unsigned * pIn2, int nWords )
+{
+    int w;
+    for ( w = nWords-1; w >= 0; w-- )
+        if ( pIn1[w] & ~pIn2[w] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two sets of bit-cuts at a node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeFindCutsMerge( Vec_Ptr_t * vCuts0, Vec_Ptr_t * vCuts1, Vec_Ptr_t * vCuts, 
+                           int nLeaves, int nWords, Vec_Int_t * vStore )
+{
+    unsigned * pBitCut, * pBitCut0, * pBitCut1, * pBitCutTest;
+    int i, k, c, w, Counter;
+    // iterate through the cut pairs
+    Vec_PtrForEachEntry( vCuts0, pBitCut0, i )
+    Vec_PtrForEachEntry( vCuts1, pBitCut1, k )
+    {
+        // skip infeasible cuts
+        Counter = 0;
+        for ( w = 0; w < nWords; w++ )
+        {
+            Counter += Extra_WordCountOnes( pBitCut0[w] | pBitCut1[w] );
+            if ( Counter > nLeaves )
+                break;
+        }
+        if ( Counter > nLeaves )
+            continue;
+        // the new cut is feasible - create it
+        pBitCutTest = Vec_IntFetch( vStore, nWords );
+        Extra_TruthOrWords( pBitCutTest, pBitCut0, pBitCut1, nWords );
+        // filter contained cuts; try to find containing cut
+        w = 0;
+        Vec_PtrForEachEntry( vCuts, pBitCut, c )
+        {
+            if ( Extra_TruthIsImplyWords( pBitCut, pBitCutTest, nWords ) )
+                break;
+            if ( Extra_TruthIsImplyWords( pBitCutTest, pBitCut, nWords ) )
+                continue;
+            Vec_PtrWriteEntry( vCuts, w++, pBitCut );
+        }
+        if ( c != Vec_PtrSize(vCuts) )
+            continue;
+        Vec_PtrShrink( vCuts, w );
+        // add the cut
+        Vec_PtrPush( vCuts, pBitCutTest );
+    }
+}
+ 
+/**Function*************************************************************
+
+  Synopsis    [Compute the set of all cuts.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManTestCutsTravAll( Ivy_Man_t * p )
+{
+    Ivy_Store_t * pStore;
+    Ivy_Obj_t * pObj;
+    Vec_Ptr_t * vNodes, * vFront;
+    Vec_Int_t * vStore;
+    Vec_Vec_t * vBitCuts;
+    int i, nCutsCut, nCutsTotal, nNodeTotal, nNodeOver;
+    int clk = clock();
+
+    vNodes = Vec_PtrAlloc( 100 );
+    vFront = Vec_PtrAlloc( 100 );
+    vStore = Vec_IntAlloc( 100 );
+    vBitCuts = Vec_VecAlloc( 100 );
+
+    nNodeTotal = nNodeOver = 0;
+    nCutsTotal = -Ivy_ManNodeNum(p);
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( !Ivy_ObjIsNode(pObj) )
+            continue;
+        pStore = Ivy_NodeFindCutsTravAll( p, pObj, 4, 60, vNodes, vFront, vStore, vBitCuts );
+        nCutsCut    = pStore->nCuts;
+        nCutsTotal += nCutsCut;
+        nNodeOver  += (nCutsCut == IVY_CUT_LIMIT);
+        nNodeTotal++;
+    }
+    printf( "Total cuts = %6d. Trivial = %6d.   Nodes = %6d. Satur = %6d.  ", 
+        nCutsTotal, Ivy_ManPiNum(p) + Ivy_ManNodeNum(p), nNodeTotal, nNodeOver );
+    PRT( "Time", clock() - clk );
+
+    Vec_PtrFree( vNodes );
+    Vec_PtrFree( vFront );
+    Vec_IntFree( vStore );
+    Vec_VecFree( vBitCuts );
+
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyDfs.c b/abc70930/src/aig/ivy/ivyDfs.c
new file mode 100644
index 00000000..c27cba31
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyDfs.c
@@ -0,0 +1,493 @@
+/**CFile****************************************************************
+
+  FileName    [ivyDfs.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [DFS collection procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyDfs.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Collects nodes in the DFS order.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManDfs_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Int_t * vNodes )
+{
+    if ( Ivy_ObjIsMarkA(pObj) )
+        return;
+    Ivy_ObjSetMarkA(pObj);
+    if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsCi(pObj) )
+    {
+        if ( p->pHaig == NULL && pObj->pEquiv )
+            Ivy_ManDfs_rec( p, Ivy_Regular(pObj->pEquiv), vNodes );
+        return;
+    }
+//printf( "visiting node %d\n", pObj->Id );
+/*
+    if ( pObj->Id == 87 || pObj->Id == 90 )
+    {
+        int y = 0;
+    }
+*/
+    assert( Ivy_ObjIsBuf(pObj) || Ivy_ObjIsAnd(pObj) || Ivy_ObjIsExor(pObj) );
+    Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes );
+    if ( !Ivy_ObjIsBuf(pObj) )
+        Ivy_ManDfs_rec( p, Ivy_ObjFanin1(pObj), vNodes );
+    if ( p->pHaig == NULL && pObj->pEquiv )
+        Ivy_ManDfs_rec( p, Ivy_Regular(pObj->pEquiv), vNodes );
+    Vec_IntPush( vNodes, pObj->Id );
+
+//printf( "adding node %d with fanins %d and %d and equiv %d (refs = %d)\n", 
+//       pObj->Id, Ivy_ObjFanin0(pObj)->Id, Ivy_ObjFanin1(pObj)->Id, 
+//       pObj->pEquiv? Ivy_Regular(pObj->pEquiv)->Id: -1, Ivy_ObjRefs(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects AND/EXOR nodes in the DFS order from CIs to COs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Ivy_ManDfs( Ivy_Man_t * p )
+{
+    Vec_Int_t * vNodes;
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( Ivy_ManLatchNum(p) == 0 );
+    // make sure the nodes are not marked
+    Ivy_ManForEachObj( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    // collect the nodes
+    vNodes = Vec_IntAlloc( Ivy_ManNodeNum(p) );
+    Ivy_ManForEachPo( p, pObj, i )
+        Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes );
+    // unmark the collected nodes
+//    Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+//        Ivy_ObjClearMarkA(pObj);
+    Ivy_ManForEachObj( p, pObj, i )
+        Ivy_ObjClearMarkA(pObj);
+    // make sure network does not have dangling nodes
+    assert( Vec_IntSize(vNodes) == Ivy_ManNodeNum(p) + Ivy_ManBufNum(p) );
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects AND/EXOR nodes in the DFS order from CIs to COs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Ivy_ManDfsSeq( Ivy_Man_t * p, Vec_Int_t ** pvLatches )
+{
+    Vec_Int_t * vNodes, * vLatches;
+    Ivy_Obj_t * pObj;
+    int i;
+//    assert( Ivy_ManLatchNum(p) > 0 );
+    // make sure the nodes are not marked
+    Ivy_ManForEachObj( p, pObj, i )
+        assert( !pObj->fMarkA && !pObj->fMarkB );
+    // collect the latches
+    vLatches = Vec_IntAlloc( Ivy_ManLatchNum(p) );
+    Ivy_ManForEachLatch( p, pObj, i )
+        Vec_IntPush( vLatches, pObj->Id );
+    // collect the nodes
+    vNodes = Vec_IntAlloc( Ivy_ManNodeNum(p) );
+    Ivy_ManForEachPo( p, pObj, i )
+        Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes );
+    Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+        Ivy_ManDfs_rec( p, Ivy_ObjFanin0(pObj), vNodes );
+    // unmark the collected nodes
+//    Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+//        Ivy_ObjClearMarkA(pObj);
+    Ivy_ManForEachObj( p, pObj, i )
+        Ivy_ObjClearMarkA(pObj);
+    // make sure network does not have dangling nodes
+//    assert( Vec_IntSize(vNodes) == Ivy_ManNodeNum(p) + Ivy_ManBufNum(p) );
+
+// temporary!!!
+
+    if ( pvLatches == NULL )
+        Vec_IntFree( vLatches );
+    else
+        *pvLatches = vLatches;
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects nodes in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCollectCone_rec( Ivy_Obj_t * pObj, Vec_Ptr_t * vCone )
+{
+    if ( pObj->fMarkA )
+        return;
+    if ( Ivy_ObjIsBuf(pObj) )
+    {
+        Ivy_ManCollectCone_rec( Ivy_ObjFanin0(pObj), vCone );
+        Vec_PtrPush( vCone, pObj );
+        return;
+    }
+    assert( Ivy_ObjIsNode(pObj) );
+    Ivy_ManCollectCone_rec( Ivy_ObjFanin0(pObj), vCone );
+    Ivy_ManCollectCone_rec( Ivy_ObjFanin1(pObj), vCone );
+    Vec_PtrPushUnique( vCone, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects nodes in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCollectCone( Ivy_Obj_t * pObj, Vec_Ptr_t * vFront, Vec_Ptr_t * vCone )
+{
+    Ivy_Obj_t * pTemp;
+    int i;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjIsNode(pObj) );
+    // mark the nodes
+    Vec_PtrForEachEntry( vFront, pTemp, i )
+        Ivy_Regular(pTemp)->fMarkA = 1;
+    assert( pObj->fMarkA == 0 );
+    // collect the cone
+    Vec_PtrClear( vCone );
+    Ivy_ManCollectCone_rec( pObj, vCone );
+    // unmark the nodes
+    Vec_PtrForEachEntry( vFront, pTemp, i )
+        Ivy_Regular(pTemp)->fMarkA = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the nodes by level.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Vec_t * Ivy_ManLevelize( Ivy_Man_t * p )
+{
+    Vec_Vec_t * vNodes;
+    Ivy_Obj_t * pObj;
+    int i;
+    vNodes = Vec_VecAlloc( 100 );
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        assert( !Ivy_ObjIsBuf(pObj) );
+        if ( Ivy_ObjIsNode(pObj) )
+            Vec_VecPush( vNodes, pObj->Level, pObj );
+    }
+    return vNodes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes required levels for each node.]
+
+  Description [Assumes topological ordering of the nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Ivy_ManRequiredLevels( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    Vec_Int_t * vLevelsR;
+    Vec_Vec_t * vNodes;
+    int i, k, Level, LevelMax;
+    assert( p->vRequired == NULL );
+    // start the required times
+    vLevelsR = Vec_IntStart( Ivy_ManObjIdMax(p) + 1 );
+    // iterate through the nodes in the reverse order
+    vNodes = Ivy_ManLevelize( p );
+    Vec_VecForEachEntryReverseReverse( vNodes, pObj, i, k )
+    {
+        Level = Vec_IntEntry( vLevelsR, pObj->Id ) + 1 + Ivy_ObjIsExor(pObj);
+        if ( Vec_IntEntry( vLevelsR, Ivy_ObjFaninId0(pObj) ) < Level )
+            Vec_IntWriteEntry( vLevelsR, Ivy_ObjFaninId0(pObj), Level );
+        if ( Vec_IntEntry( vLevelsR, Ivy_ObjFaninId1(pObj) ) < Level )
+            Vec_IntWriteEntry( vLevelsR, Ivy_ObjFaninId1(pObj), Level );
+    }
+    Vec_VecFree( vNodes );
+    // convert it into the required times
+    LevelMax = Ivy_ManLevels( p );
+//printf( "max %5d\n",LevelMax );
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        Level = Vec_IntEntry( vLevelsR, pObj->Id );
+        Vec_IntWriteEntry( vLevelsR, pObj->Id, LevelMax - Level );
+//printf( "%5d : %5d %5d\n", pObj->Id, Level, LevelMax - Level );
+    }
+    p->vRequired = vLevelsR;
+    return vLevelsR;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively detects combinational loops.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManIsAcyclic_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    // skip the node if it is already visited
+    if ( Ivy_ObjIsTravIdPrevious(p, pObj) )
+        return 1;
+    // check if the node is part of the combinational loop
+    if ( Ivy_ObjIsTravIdCurrent(p, pObj) )
+    {
+        fprintf( stdout, "Manager contains combinational loop!\n" );
+        fprintf( stdout, "Node \"%d\" is encountered twice on the following path:\n",  Ivy_ObjId(pObj) );
+        fprintf( stdout, " %d",  Ivy_ObjId(pObj) );
+        return 0;
+    }
+    // mark this node as a node on the current path
+    Ivy_ObjSetTravIdCurrent( p, pObj );
+    // explore equivalent nodes if pObj is the main node
+    if ( p->pHaig == NULL && pObj->pEquiv && Ivy_ObjRefs(pObj) > 0 )
+    {
+        Ivy_Obj_t * pTemp;
+        assert( !Ivy_IsComplement(pObj->pEquiv) );
+        for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+        {
+            // traverse the fanin's cone searching for the loop
+            if ( !Ivy_ManIsAcyclic_rec(p, pTemp) )
+            {
+                // return as soon as the loop is detected
+                fprintf( stdout, " -> (%d", Ivy_ObjId(pObj) );
+                for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+                    fprintf( stdout, " %d", Ivy_ObjId(pTemp) );
+                fprintf( stdout, ")" );
+                return 0; 
+            }
+        }
+    }
+    // quite if it is a CI node
+    if ( Ivy_ObjIsCi(pObj) || Ivy_ObjIsConst1(pObj) )
+    {
+        // mark this node as a visited node
+        Ivy_ObjSetTravIdPrevious( p, pObj );
+        return 1;
+    }
+    assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj) );
+    // traverse the fanin's cone searching for the loop
+    if ( !Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin0(pObj)) )
+    {
+        // return as soon as the loop is detected
+        fprintf( stdout, " -> %d", Ivy_ObjId(pObj) );
+        return 0;
+    }
+    // traverse the fanin's cone searching for the loop
+    if ( Ivy_ObjIsNode(pObj) && !Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin1(pObj)) )
+    {
+        // return as soon as the loop is detected
+        fprintf( stdout, " -> %d", Ivy_ObjId(pObj) );
+        return 0;
+    }
+    // mark this node as a visited node
+    Ivy_ObjSetTravIdPrevious( p, pObj );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Detects combinational loops.]
+
+  Description [This procedure is based on the idea suggested by Donald Chai. 
+  As we traverse the network and visit the nodes, we need to distinquish 
+  three types of nodes: (1) those that are visited for the first time, 
+  (2) those that have been visited in this traversal but are currently not 
+  on the traversal path, (3) those that have been visited and are currently 
+  on the travesal path. When the node of type (3) is encountered, it means 
+  that there is a combinational loop. To mark the three types of nodes, 
+  two new values of the traversal IDs are used.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManIsAcyclic( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int fAcyclic, i;
+    // set the traversal ID for this DFS ordering
+    Ivy_ManIncrementTravId( p );   
+    Ivy_ManIncrementTravId( p );   
+    // pObj->TravId == pNet->nTravIds      means "pObj is on the path"
+    // pObj->TravId == pNet->nTravIds - 1  means "pObj is visited but is not on the path"
+    // pObj->TravId <  pNet->nTravIds - 1  means "pObj is not visited"
+    // traverse the network to detect cycles
+    fAcyclic = 1;
+    Ivy_ManForEachCo( p, pObj, i )
+    {
+        // traverse the output logic cone
+        if ( fAcyclic = Ivy_ManIsAcyclic_rec(p, Ivy_ObjFanin0(pObj)) )
+            continue;
+        // stop as soon as the first loop is detected
+        fprintf( stdout, " (cone of %s \"%d\")\n", Ivy_ObjIsLatch(pObj)? "latch" : "PO", Ivy_ObjId(pObj) );
+        break;
+    }
+    return fAcyclic;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the levels of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManSetLevels_rec( Ivy_Obj_t * pObj, int fHaig )
+{
+    // quit if the node is visited
+    if ( Ivy_ObjIsMarkA(pObj) )
+        return pObj->Level;
+    Ivy_ObjSetMarkA(pObj);
+    // quit if this is a CI
+    if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsCi(pObj) )
+        return 0;
+    assert( Ivy_ObjIsBuf(pObj) || Ivy_ObjIsAnd(pObj) || Ivy_ObjIsExor(pObj) );
+    // get levels of the fanins
+    Ivy_ManSetLevels_rec( Ivy_ObjFanin0(pObj), fHaig );
+    if ( !Ivy_ObjIsBuf(pObj) )
+        Ivy_ManSetLevels_rec( Ivy_ObjFanin1(pObj), fHaig );
+    // get level of the node
+    if ( Ivy_ObjIsBuf(pObj) )
+        pObj->Level = 1 + Ivy_ObjFanin0(pObj)->Level;
+    else if ( Ivy_ObjIsNode(pObj) )
+        pObj->Level = Ivy_ObjLevelNew( pObj );
+    else assert( 0 );
+    // get level of other choices
+    if ( fHaig && pObj->pEquiv && Ivy_ObjRefs(pObj) > 0 )
+    {
+        Ivy_Obj_t * pTemp;
+        unsigned LevelMax = pObj->Level;
+        for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+        {
+            Ivy_ManSetLevels_rec( pTemp, fHaig );
+            LevelMax = IVY_MAX( LevelMax, pTemp->Level );
+        }
+        // get this level
+        pObj->Level = LevelMax;
+        for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+            pTemp->Level = LevelMax;
+    }
+    return pObj->Level;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the levels of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManSetLevels( Ivy_Man_t * p, int fHaig )
+{
+    Ivy_Obj_t * pObj;
+    int i, LevelMax;
+    // check if CIs have choices
+    if ( fHaig )
+    {
+        Ivy_ManForEachCi( p, pObj, i )
+            if ( pObj->pEquiv )
+                printf( "CI %d has a choice, which will not be visualized.\n", pObj->Id );
+    }
+    // clean the levels
+    Ivy_ManForEachObj( p, pObj, i )
+        pObj->Level = 0;
+    // compute the levels
+    LevelMax = 0;
+    Ivy_ManForEachCo( p, pObj, i )
+    {
+        Ivy_ManSetLevels_rec( Ivy_ObjFanin0(pObj), fHaig );
+        LevelMax = IVY_MAX( LevelMax, (int)Ivy_ObjFanin0(pObj)->Level );
+    }
+    // compute levels of nodes without fanout
+    Ivy_ManForEachObj( p, pObj, i )
+        if ( (Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj)) && Ivy_ObjRefs(pObj) == 0 )
+        {
+            Ivy_ManSetLevels_rec( pObj, fHaig );
+            LevelMax = IVY_MAX( LevelMax, (int)pObj->Level );
+        }
+    // clean the marks
+    Ivy_ManForEachObj( p, pObj, i )
+        Ivy_ObjClearMarkA(pObj);
+    return LevelMax;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyDsd.c b/abc70930/src/aig/ivy/ivyDsd.c
new file mode 100644
index 00000000..3b8a2e68
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyDsd.c
@@ -0,0 +1,819 @@
+/**CFile****************************************************************
+
+  FileName    [ivyDsd.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Disjoint-support decomposition.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyDsd.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// decomposition types
+typedef enum { 
+    IVY_DEC_PI,             // 0: var
+    IVY_DEC_CONST1,         // 1: CONST1
+    IVY_DEC_BUF,            // 2: BUF
+    IVY_DEC_AND,            // 3: AND
+    IVY_DEC_EXOR,           // 4: EXOR
+    IVY_DEC_MUX,            // 5: MUX
+    IVY_DEC_MAJ,            // 6: MAJ
+    IVY_DEC_PRIME           // 7: undecomposable
+} Ivy_DecType_t;
+
+typedef struct Ivy_Dec_t_ Ivy_Dec_t;
+struct Ivy_Dec_t_
+{
+    unsigned  Type   : 4;   // the node type (PI, CONST1, AND, EXOR, MUX, PRIME)
+    unsigned  fCompl : 1;   // shows if node is complemented (root node only)
+    unsigned  nFans  : 3;   // the number of fanins
+    unsigned  Fan0   : 4;   // fanin 0
+    unsigned  Fan1   : 4;   // fanin 1 
+    unsigned  Fan2   : 4;   // fanin 2
+    unsigned  Fan3   : 4;   // fanin 3 
+    unsigned  Fan4   : 4;   // fanin 4 
+    unsigned  Fan5   : 4;   // fanin 5
+};
+
+static inline int        Ivy_DecToInt( Ivy_Dec_t Node )     { return *((int *)&Node);       }
+static inline Ivy_Dec_t  Ivy_IntToDec( int Node )           { return *((Ivy_Dec_t *)&Node); }
+static inline void       Ivy_DecClear( Ivy_Dec_t * pNode )  { *((int *)pNode) = 0;          }
+
+
+static unsigned s_Masks[6][2] = {
+    { 0x55555555, 0xAAAAAAAA },
+    { 0x33333333, 0xCCCCCCCC },
+    { 0x0F0F0F0F, 0xF0F0F0F0 },
+    { 0x00FF00FF, 0xFF00FF00 },
+    { 0x0000FFFF, 0xFFFF0000 },
+    { 0x00000000, 0xFFFFFFFF }
+};
+
+static inline int        Ivy_TruthWordCountOnes( unsigned uWord )
+{
+    uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
+    uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
+    uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
+    uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
+    return  (uWord & 0x0000FFFF) + (uWord>>16);
+}
+
+static inline int        Ivy_TruthCofactorIsConst( unsigned uTruth, int Var, int Cof, int Const )
+{
+    if ( Const == 0 )
+        return (uTruth & s_Masks[Var][Cof]) == 0;
+    else
+        return (uTruth & s_Masks[Var][Cof]) == s_Masks[Var][Cof];
+}
+
+static inline int        Ivy_TruthCofactorIsOne( unsigned uTruth, int Var )
+{
+    return (uTruth & s_Masks[Var][0]) == 0;
+}
+
+static inline unsigned   Ivy_TruthCofactor( unsigned uTruth, int Var )
+{
+    unsigned uCofactor = uTruth & s_Masks[Var >> 1][(Var & 1) == 0];
+    int Shift = (1 << (Var >> 1));
+    if ( Var & 1 )
+        return uCofactor | (uCofactor << Shift);
+    return uCofactor | (uCofactor >> Shift);
+}
+
+static inline unsigned   Ivy_TruthCofactor2( unsigned uTruth, int Var0, int Var1 )
+{
+    return Ivy_TruthCofactor( Ivy_TruthCofactor(uTruth, Var0), Var1 );
+}
+
+// returns 1 if the truth table depends on this var (var is regular interger var)
+static inline int        Ivy_TruthDepends( unsigned uTruth, int Var )
+{
+    return Ivy_TruthCofactor(uTruth, Var << 1) != Ivy_TruthCofactor(uTruth, (Var << 1) | 1);
+}
+
+static inline void       Ivy_DecSetVar( Ivy_Dec_t * pNode, int iNum, unsigned Var )
+{
+    assert( iNum >= 0 && iNum <= 5 );
+    switch( iNum )
+    {
+        case 0: pNode->Fan0 = Var; break;
+        case 1: pNode->Fan1 = Var; break;
+        case 2: pNode->Fan2 = Var; break;
+        case 3: pNode->Fan3 = Var; break;
+        case 4: pNode->Fan4 = Var; break;
+        case 5: pNode->Fan5 = Var; break;
+    }
+}
+
+static inline unsigned   Ivy_DecGetVar( Ivy_Dec_t * pNode, int iNum )
+{
+    assert( iNum >= 0 && iNum <= 5 );
+    switch( iNum )
+    {
+        case 0: return pNode->Fan0;
+        case 1: return pNode->Fan1;
+        case 2: return pNode->Fan2;
+        case 3: return pNode->Fan3;
+        case 4: return pNode->Fan4;
+        case 5: return pNode->Fan5;
+    }
+    return ~0;
+}
+
+static int   Ivy_TruthDecompose_rec( unsigned uTruth, Vec_Int_t * vTree );
+static int   Ivy_TruthRecognizeMuxMaj( unsigned uTruth, int * pSupp, int nSupp, Vec_Int_t * vTree );
+
+//int nTruthDsd;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes DSD of truth table of 5 variables or less.]
+
+  Description [Returns 1 if the function is a constant or is fully 
+  DSD decomposable using AND/EXOR/MUX gates.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_TruthDsd( unsigned uTruth, Vec_Int_t * vTree )
+{
+    Ivy_Dec_t Node;
+    int i, RetValue;
+    // set the PI variables
+    Vec_IntClear( vTree );
+    for ( i = 0; i < 5; i++ )
+        Vec_IntPush( vTree, 0 );
+    // check if it is a constant
+    if ( uTruth == 0 || ~uTruth == 0 )
+    {
+        Ivy_DecClear( &Node );
+        Node.Type = IVY_DEC_CONST1;
+        Node.fCompl = (uTruth == 0);
+        Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+        return 1;
+    }
+    // perform the decomposition
+    RetValue = Ivy_TruthDecompose_rec( uTruth, vTree );
+    if ( RetValue == -1 )
+        return 0;
+    // get the topmost node
+    if ( (RetValue >> 1) < 5 )
+    { // add buffer
+        Ivy_DecClear( &Node );
+        Node.Type = IVY_DEC_BUF;
+        Node.fCompl = (RetValue & 1);
+        Node.Fan0 = ((RetValue >> 1) << 1);
+        Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+    }
+    else if ( RetValue & 1 )
+    { // check if the topmost node has to be complemented
+        Node = Ivy_IntToDec( Vec_IntPop(vTree) );
+        assert( Node.fCompl == 0 );
+        Node.fCompl = (RetValue & 1);
+        Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+    }
+    if ( uTruth != Ivy_TruthDsdCompute(vTree) )
+        printf( "Verification failed.\n" );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes DSD of truth table.]
+
+  Description [Returns the number of topmost decomposition node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_TruthDecompose_rec( unsigned uTruth, Vec_Int_t * vTree )
+{
+    Ivy_Dec_t Node;
+    int Supp[5], Vars0[5], Vars1[5], Vars2[5], * pVars;
+    int nSupp, Count0, Count1, Count2, nVars, RetValue, fCompl, i;
+    unsigned uTruthCof, uCof0, uCof1;
+
+    // get constant confactors
+    Count0 = Count1 = Count2 = nSupp = 0;
+    for ( i = 0; i < 5; i++ )
+    {
+        if ( Ivy_TruthCofactorIsConst(uTruth, i, 0, 0) )
+            Vars0[Count0++] = (i << 1) | 0;
+        else if ( Ivy_TruthCofactorIsConst(uTruth, i, 1, 0) )
+            Vars0[Count0++] = (i << 1) | 1;
+        else if ( Ivy_TruthCofactorIsConst(uTruth, i, 0, 1) )
+            Vars1[Count1++] = (i << 1) | 0;
+        else if ( Ivy_TruthCofactorIsConst(uTruth, i, 1, 1) )
+            Vars1[Count1++] = (i << 1) | 1;
+        else
+        {
+            uCof0 = Ivy_TruthCofactor( uTruth, (i << 1) | 1 );
+            uCof1 = Ivy_TruthCofactor( uTruth, (i << 1) | 0 );
+            if ( uCof0 == ~uCof1 )
+                Vars2[Count2++] = (i << 1) | 0;
+            else if ( uCof0 != uCof1 )
+                Supp[nSupp++] = i;
+        }
+    }
+    assert( Count0 == 0 || Count1 == 0 );
+    assert( Count0 == 0 || Count2 == 0 );
+    assert( Count1 == 0 || Count2 == 0 );
+
+    // consider the case of a single variable
+    if ( Count0 == 1 && nSupp == 0 )
+        return Vars0[0];
+
+    // consider more complex decompositions
+    if ( Count0 == 0 && Count1 == 0 && Count2 == 0 )
+        return Ivy_TruthRecognizeMuxMaj( uTruth, Supp, nSupp, vTree );
+
+    // extract the nodes
+    Ivy_DecClear( &Node );
+    if ( Count0 > 0 )
+        nVars = Count0, pVars = Vars0, Node.Type = IVY_DEC_AND,  fCompl = 0;
+    else if ( Count1 > 0 )
+        nVars = Count1, pVars = Vars1, Node.Type = IVY_DEC_AND,  fCompl = 1, uTruth = ~uTruth;
+    else if ( Count2 > 0 )
+        nVars = Count2, pVars = Vars2, Node.Type = IVY_DEC_EXOR, fCompl = 0;
+    else 
+        assert( 0 );
+    Node.nFans = nVars+(nSupp>0);
+
+    // compute cofactor
+    uTruthCof = uTruth;
+    for ( i = 0; i < nVars; i++ )
+    {
+        uTruthCof = Ivy_TruthCofactor( uTruthCof, pVars[i] );
+        Ivy_DecSetVar( &Node, i, pVars[i] );
+    }
+
+    if ( Node.Type == IVY_DEC_EXOR )
+        fCompl ^= ((Node.nFans & 1) == 0);
+
+    if ( nSupp > 0 )
+    {
+        assert( uTruthCof != 0 && ~uTruthCof != 0 );
+        // call recursively
+        RetValue = Ivy_TruthDecompose_rec( uTruthCof, vTree );
+        // quit if non-decomposable
+        if ( RetValue == -1 )
+            return -1;
+        // remove the complement from the child if the node is EXOR
+        if ( Node.Type == IVY_DEC_EXOR && (RetValue & 1) )
+        {
+            fCompl ^= 1;
+            RetValue ^= 1;
+        }
+        // set the new decomposition
+        Ivy_DecSetVar( &Node, nVars, RetValue );
+    }
+    else if ( Node.Type == IVY_DEC_EXOR )
+        fCompl ^= (uTruthCof == 0);
+
+    Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+    return ((Vec_IntSize(vTree)-1) << 1) | fCompl;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns a non-negative number if the truth table is a MUX.]
+
+  Description [If the truth table is a MUX, returns the variable as follows:
+  first, control variable; second, positive cofactor; third, negative cofactor.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_TruthRecognizeMuxMaj( unsigned uTruth, int * pSupp, int nSupp, Vec_Int_t * vTree )
+{
+    Ivy_Dec_t Node;
+    int i, k, RetValue0, RetValue1;
+    unsigned uCof0, uCof1, Num;
+    char Count[3];
+    assert( nSupp >= 3 );
+    // start the node
+    Ivy_DecClear( &Node );
+    Node.Type = IVY_DEC_MUX;
+    Node.nFans = 3;
+    // try each of the variables
+    for ( i = 0; i < nSupp; i++ )
+    {
+        // get the cofactors with respect to these variables
+        uCof0 = Ivy_TruthCofactor( uTruth, (pSupp[i] << 1) | 1 );
+        uCof1 = Ivy_TruthCofactor( uTruth,  pSupp[i] << 1 );
+        // go through all other variables and make sure 
+        // each of them belongs to the support of one cofactor
+        for ( k = 0; k < nSupp; k++ )
+        {
+            if ( k == i )
+                continue;
+            if ( Ivy_TruthDepends(uCof0, pSupp[k]) && Ivy_TruthDepends(uCof1, pSupp[k]) )
+                break;
+        }
+        if ( k < nSupp )
+            continue;
+        // MUX decomposition exists
+        RetValue0 = Ivy_TruthDecompose_rec( uCof0, vTree );
+        if ( RetValue0 == -1 )
+            break;
+        RetValue1 = Ivy_TruthDecompose_rec( uCof1, vTree );
+        if ( RetValue1 == -1 )
+            break;
+        // both of them exist; create the node
+        Ivy_DecSetVar( &Node, 0, pSupp[i] << 1 );
+        Ivy_DecSetVar( &Node, 1, RetValue1 );
+        Ivy_DecSetVar( &Node, 2, RetValue0 );
+        Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+        return ((Vec_IntSize(vTree)-1) << 1) | 0;
+    }
+    // check majority gate
+    if ( nSupp > 3 )
+        return -1;
+    if ( Ivy_TruthWordCountOnes(uTruth) != 16 )
+        return -1;
+    // this is a majority gate; determine polarity
+    Node.Type = IVY_DEC_MAJ;
+    Count[0] = Count[1] = Count[2] = 0;
+    for ( i = 0; i < 8; i++ )
+    {
+        Num = 0;
+        for ( k = 0; k < 3; k++ )
+            if ( i & (1 << k) )
+                Num |= (1 << pSupp[k]);
+        assert( Num < 32 );
+        if ( (uTruth & (1 << Num)) == 0 )
+            continue;
+        for ( k = 0; k < 3; k++ )
+            if ( i & (1 << k) )
+                Count[k]++;
+    }
+    assert( Count[0] == 1 || Count[0] == 3 );
+    assert( Count[1] == 1 || Count[1] == 3 );
+    assert( Count[2] == 1 || Count[2] == 3 );
+    Ivy_DecSetVar( &Node, 0, (pSupp[0] << 1)|(Count[0] == 1) );
+    Ivy_DecSetVar( &Node, 1, (pSupp[1] << 1)|(Count[1] == 1) );
+    Ivy_DecSetVar( &Node, 2, (pSupp[2] << 1)|(Count[2] == 1) );
+    Vec_IntPush( vTree, Ivy_DecToInt(Node) );
+    return ((Vec_IntSize(vTree)-1) << 1) | 0;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of decomposition tree for verification.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_TruthDsdCompute_rec( int iNode, Vec_Int_t * vTree )
+{
+    unsigned uTruthChild, uTruthTotal;
+    int Var, i;
+    // get the node
+    Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+    // compute the node function
+    if ( Node.Type == IVY_DEC_CONST1 )
+        return s_Masks[5][ !Node.fCompl ];
+    if ( Node.Type == IVY_DEC_PI )
+        return s_Masks[iNode][ !Node.fCompl ];
+    if ( Node.Type == IVY_DEC_BUF )
+    {
+        uTruthTotal = Ivy_TruthDsdCompute_rec( Node.Fan0 >> 1, vTree );
+        return Node.fCompl? ~uTruthTotal : uTruthTotal;
+    }
+    if ( Node.Type == IVY_DEC_AND )
+    {
+        uTruthTotal = s_Masks[5][1];
+        for ( i = 0; i < (int)Node.nFans; i++ )
+        {
+            Var = Ivy_DecGetVar( &Node, i );
+            uTruthChild = Ivy_TruthDsdCompute_rec( Var >> 1, vTree );
+            uTruthTotal = (Var & 1)? uTruthTotal & ~uTruthChild : uTruthTotal & uTruthChild;
+        }
+        return Node.fCompl? ~uTruthTotal : uTruthTotal;
+    }
+    if ( Node.Type == IVY_DEC_EXOR )
+    {
+        uTruthTotal = 0;
+        for ( i = 0; i < (int)Node.nFans; i++ )
+        {
+            Var = Ivy_DecGetVar( &Node, i );
+            uTruthTotal ^= Ivy_TruthDsdCompute_rec( Var >> 1, vTree );
+            assert( (Var & 1) == 0 );
+        }
+        return Node.fCompl? ~uTruthTotal : uTruthTotal;
+    }
+    assert( Node.fCompl == 0 );
+    if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+    {
+        unsigned uTruthChildC, uTruthChild1, uTruthChild0;
+        int VarC, Var1, Var0;
+        VarC = Ivy_DecGetVar( &Node, 0 );
+        Var1 = Ivy_DecGetVar( &Node, 1 );
+        Var0 = Ivy_DecGetVar( &Node, 2 );
+        uTruthChildC = Ivy_TruthDsdCompute_rec( VarC >> 1, vTree );
+        uTruthChild1 = Ivy_TruthDsdCompute_rec( Var1 >> 1, vTree );
+        uTruthChild0 = Ivy_TruthDsdCompute_rec( Var0 >> 1, vTree );
+        assert( Node.Type == IVY_DEC_MAJ || (VarC & 1) == 0 );
+        uTruthChildC = (VarC & 1)? ~uTruthChildC : uTruthChildC;
+        uTruthChild1 = (Var1 & 1)? ~uTruthChild1 : uTruthChild1;
+        uTruthChild0 = (Var0 & 1)? ~uTruthChild0 : uTruthChild0;
+        if ( Node.Type == IVY_DEC_MUX )
+            return (uTruthChildC & uTruthChild1) | (~uTruthChildC & uTruthChild0);
+        else
+            return (uTruthChildC & uTruthChild1) | (uTruthChildC & uTruthChild0) | (uTruthChild1 & uTruthChild0);
+    }
+    assert( 0 );
+    return 0;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of decomposition tree for verification.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_TruthDsdCompute( Vec_Int_t * vTree )
+{
+    return Ivy_TruthDsdCompute_rec( Vec_IntSize(vTree)-1, vTree );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the decomposition tree.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthDsdPrint_rec( FILE * pFile, int iNode, Vec_Int_t * vTree )
+{
+    int Var, i;
+    // get the node
+    Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+    // compute the node function
+    if ( Node.Type == IVY_DEC_CONST1 )
+        fprintf( pFile, "Const1%s", (Node.fCompl? "\'" : "") );
+    else if ( Node.Type == IVY_DEC_PI )
+        fprintf( pFile, "%c%s", 'a' + iNode, (Node.fCompl? "\'" : "") );
+    else if ( Node.Type == IVY_DEC_BUF )
+    {
+        Ivy_TruthDsdPrint_rec( pFile, Node.Fan0 >> 1, vTree );
+        fprintf( pFile, "%s", (Node.fCompl? "\'" : "") );
+    }
+    else if ( Node.Type == IVY_DEC_AND )
+    {
+        fprintf( pFile, "AND(" );
+        for ( i = 0; i < (int)Node.nFans; i++ )
+        {
+            Var = Ivy_DecGetVar( &Node, i );
+            Ivy_TruthDsdPrint_rec( pFile, Var >> 1, vTree );
+            fprintf( pFile, "%s", (Var & 1)? "\'" : "" );
+            if ( i != (int)Node.nFans-1 )
+                fprintf( pFile, "," );
+        }
+        fprintf( pFile, ")%s", (Node.fCompl? "\'" : "") );
+    }
+    else if ( Node.Type == IVY_DEC_EXOR )
+    {
+        fprintf( pFile, "EXOR(" );
+        for ( i = 0; i < (int)Node.nFans; i++ )
+        {
+            Var = Ivy_DecGetVar( &Node, i );
+            Ivy_TruthDsdPrint_rec( pFile, Var >> 1, vTree );
+            if ( i != (int)Node.nFans-1 )
+                fprintf( pFile, "," );
+            assert( (Var & 1) == 0 );
+        }
+        fprintf( pFile, ")%s", (Node.fCompl? "\'" : "") );
+    }
+    else if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+    {
+        int VarC, Var1, Var0;
+        assert( Node.fCompl == 0 );
+        VarC = Ivy_DecGetVar( &Node, 0 );
+        Var1 = Ivy_DecGetVar( &Node, 1 );
+        Var0 = Ivy_DecGetVar( &Node, 2 );
+        fprintf( pFile, "%s", (Node.Type == IVY_DEC_MUX)? "MUX(" : "MAJ(" );
+        Ivy_TruthDsdPrint_rec( pFile, VarC >> 1, vTree );
+        fprintf( pFile, "%s", (VarC & 1)? "\'" : "" );
+        fprintf( pFile, "," );
+        Ivy_TruthDsdPrint_rec( pFile, Var1 >> 1, vTree );
+        fprintf( pFile, "%s", (Var1 & 1)? "\'" : "" );
+        fprintf( pFile, "," );
+        Ivy_TruthDsdPrint_rec( pFile, Var0 >> 1, vTree );
+        fprintf( pFile, "%s", (Var0 & 1)? "\'" : "" );
+        fprintf( pFile, ")" );
+    }
+    else assert( 0 );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the decomposition tree.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthDsdPrint( FILE * pFile, Vec_Int_t * vTree )
+{
+    fprintf( pFile, "F = " );
+    Ivy_TruthDsdPrint_rec( pFile, Vec_IntSize(vTree)-1, vTree );
+    fprintf( pFile, "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implement DSD in the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ManDsdConstruct_rec( Ivy_Man_t * p, Vec_Int_t * vFront, int iNode, Vec_Int_t * vTree )
+{
+    Ivy_Obj_t * pResult, * pChild, * pNodes[16];
+    int Var, i;
+    // get the node
+    Ivy_Dec_t Node = Ivy_IntToDec( Vec_IntEntry(vTree, iNode) );
+    // compute the node function
+    if ( Node.Type == IVY_DEC_CONST1 )
+        return Ivy_NotCond( Ivy_ManConst1(p), Node.fCompl );
+    if ( Node.Type == IVY_DEC_PI )
+    {
+        pResult = Ivy_ManObj( p, Vec_IntEntry(vFront, iNode) );
+        return Ivy_NotCond( pResult, Node.fCompl );
+    }
+    if ( Node.Type == IVY_DEC_BUF )
+    {
+        pResult = Ivy_ManDsdConstruct_rec( p, vFront, Node.Fan0 >> 1, vTree );
+        return Ivy_NotCond( pResult, Node.fCompl );
+    }
+    if ( Node.Type == IVY_DEC_AND || Node.Type == IVY_DEC_EXOR )
+    {
+        for ( i = 0; i < (int)Node.nFans; i++ )
+        {
+            Var = Ivy_DecGetVar( &Node, i );
+            assert( Node.Type == IVY_DEC_AND || (Var & 1) == 0 );
+            pChild = Ivy_ManDsdConstruct_rec( p, vFront, Var >> 1, vTree );
+            pChild = Ivy_NotCond( pChild, (Var & 1) );
+            pNodes[i] = pChild;
+        }
+
+//        Ivy_MultiEval( pNodes, Node.nFans, Node.Type == IVY_DEC_AND ? IVY_AND : IVY_EXOR );
+
+        pResult = Ivy_Multi( p, pNodes, Node.nFans, Node.Type == IVY_DEC_AND ? IVY_AND : IVY_EXOR );
+        return Ivy_NotCond( pResult, Node.fCompl );
+    }
+    assert( Node.fCompl == 0 );
+    if ( Node.Type == IVY_DEC_MUX || Node.Type == IVY_DEC_MAJ )
+    {
+        int VarC, Var1, Var0;
+        VarC = Ivy_DecGetVar( &Node, 0 );
+        Var1 = Ivy_DecGetVar( &Node, 1 );
+        Var0 = Ivy_DecGetVar( &Node, 2 );
+        pNodes[0] = Ivy_ManDsdConstruct_rec( p, vFront, VarC >> 1, vTree );
+        pNodes[1] = Ivy_ManDsdConstruct_rec( p, vFront, Var1 >> 1, vTree );
+        pNodes[2] = Ivy_ManDsdConstruct_rec( p, vFront, Var0 >> 1, vTree );
+        assert( Node.Type == IVY_DEC_MAJ || (VarC & 1) == 0 );
+        pNodes[0] = Ivy_NotCond( pNodes[0], (VarC & 1) );
+        pNodes[1] = Ivy_NotCond( pNodes[1], (Var1 & 1) );
+        pNodes[2] = Ivy_NotCond( pNodes[2], (Var0 & 1) );
+        if ( Node.Type == IVY_DEC_MUX )
+            return Ivy_Mux( p, pNodes[0], pNodes[1], pNodes[2] );
+        else
+            return Ivy_Maj( p, pNodes[0], pNodes[1], pNodes[2] );
+    }
+    assert( 0 );
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implement DSD in the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ManDsdConstruct( Ivy_Man_t * p, Vec_Int_t * vFront, Vec_Int_t * vTree )
+{
+    int Entry, i;
+    // implement latches on the frontier (TEMPORARY!!!)
+    Vec_IntForEachEntry( vFront, Entry, i )
+        Vec_IntWriteEntry( vFront, i, Ivy_LeafId(Entry) );
+    // recursively construct the tree
+    return Ivy_ManDsdConstruct_rec( p, vFront, Vec_IntSize(vTree)-1, vTree );
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthDsdComputePrint( unsigned uTruth )
+{
+    static Vec_Int_t * vTree = NULL;
+    if ( vTree == NULL )
+        vTree = Vec_IntAlloc( 12 );
+    if ( Ivy_TruthDsd( uTruth, vTree ) )
+        Ivy_TruthDsdPrint( stdout, vTree );
+    else
+        printf( "Undecomposable\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthTestOne( unsigned uTruth )
+{
+    static int Counter = 0;
+    static Vec_Int_t * vTree = NULL;
+    // decompose
+    if ( vTree == NULL )
+        vTree = Vec_IntAlloc( 12 );
+
+    if ( !Ivy_TruthDsd( uTruth, vTree ) )
+    {
+//        printf( "Undecomposable\n" );
+    }
+    else
+    {
+//        nTruthDsd++;
+        printf( "%5d : ", Counter++ );
+        Extra_PrintBinary( stdout, &uTruth, 32 );
+        printf( "  " );
+        Ivy_TruthDsdPrint( stdout, vTree );
+        if ( uTruth != Ivy_TruthDsdCompute(vTree) )
+            printf( "Verification failed.\n" );
+    }
+//    Vec_IntFree( vTree );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthTest()
+{
+    FILE * pFile;
+    char Buffer[100];
+    unsigned uTruth;
+    int i;
+
+    pFile = fopen( "npn4.txt", "r" );
+    for ( i = 0; i < 222; i++ )
+//    pFile = fopen( "npn5.txt", "r" );
+//    for ( i = 0; i < 616126; i++ )
+    {
+        fscanf( pFile, "%s", Buffer );
+        Extra_ReadHexadecimal( &uTruth, Buffer+2, 4 );
+//        Extra_ReadHexadecimal( &uTruth, Buffer+2, 5 );
+        uTruth |= (uTruth << 16);
+//        uTruth = ~uTruth;
+        Ivy_TruthTestOne( uTruth );
+    }
+    fclose( pFile );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthTest3()
+{
+    FILE * pFile;
+    char Buffer[100];
+    unsigned uTruth;
+    int i;
+
+    pFile = fopen( "npn3.txt", "r" );
+    for ( i = 0; i < 14; i++ )
+    {
+        fscanf( pFile, "%s", Buffer );
+        Extra_ReadHexadecimal( &uTruth, Buffer+2, 3 );
+        uTruth = uTruth | (uTruth << 8) | (uTruth << 16) | (uTruth << 24);
+        Ivy_TruthTestOne( uTruth );
+    }
+    fclose( pFile );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TruthTest5()
+{
+    FILE * pFile;
+    char Buffer[100];
+    unsigned uTruth;
+    int i;
+
+//    pFile = fopen( "npn4.txt", "r" );
+//    for ( i = 0; i < 222; i++ )
+    pFile = fopen( "npn5.txt", "r" );
+    for ( i = 0; i < 616126; i++ )
+    {
+        fscanf( pFile, "%s", Buffer );
+//        Extra_ReadHexadecimal( &uTruth, Buffer+2, 4 );
+        Extra_ReadHexadecimal( &uTruth, Buffer+2, 5 );
+//        uTruth |= (uTruth << 16);
+//        uTruth = ~uTruth;
+        Ivy_TruthTestOne( uTruth );
+    }
+    fclose( pFile );
+}
+
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyFanout.c b/abc70930/src/aig/ivy/ivyFanout.c
new file mode 100644
index 00000000..3930186a
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyFanout.c
@@ -0,0 +1,309 @@
+/**CFile****************************************************************
+
+  FileName    [ivyFanout.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Representation of the fanouts.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyFanout.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// getting hold of the next fanout of the node
+static inline Ivy_Obj_t * Ivy_ObjNextFanout( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    if ( pFanout == NULL )
+        return NULL;
+    if ( Ivy_ObjFanin0(pFanout) == pObj )
+        return pFanout->pNextFan0;
+    assert( Ivy_ObjFanin1(pFanout) == pObj );
+    return pFanout->pNextFan1;
+}
+
+// getting hold of the previous fanout of the node
+static inline Ivy_Obj_t * Ivy_ObjPrevFanout( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    if ( pFanout == NULL )
+        return NULL;
+    if ( Ivy_ObjFanin0(pFanout) == pObj )
+        return pFanout->pPrevFan0;
+    assert( Ivy_ObjFanin1(pFanout) == pObj );
+    return pFanout->pPrevFan1;
+}
+
+// getting hold of the place where the next fanout will be attached
+static inline Ivy_Obj_t ** Ivy_ObjNextFanoutPlace( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    if ( Ivy_ObjFanin0(pFanout) == pObj )
+        return &pFanout->pNextFan0;
+    assert( Ivy_ObjFanin1(pFanout) == pObj );
+    return &pFanout->pNextFan1;
+}
+
+// getting hold of the place where the next fanout will be attached
+static inline Ivy_Obj_t ** Ivy_ObjPrevFanoutPlace( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    if ( Ivy_ObjFanin0(pFanout) == pObj )
+        return &pFanout->pPrevFan0;
+    assert( Ivy_ObjFanin1(pFanout) == pObj );
+    return &pFanout->pPrevFan1;
+}
+
+// getting hold of the place where the next fanout will be attached
+static inline Ivy_Obj_t ** Ivy_ObjPrevNextFanoutPlace( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    Ivy_Obj_t * pTemp;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    pTemp = Ivy_ObjPrevFanout(pObj, pFanout);
+    if ( pTemp == NULL )
+        return &pObj->pFanout;
+    if ( Ivy_ObjFanin0(pTemp) == pObj )
+        return &pTemp->pNextFan0;
+    assert( Ivy_ObjFanin1(pTemp) == pObj );
+    return &pTemp->pNextFan1;
+}
+
+// getting hold of the place where the next fanout will be attached
+static inline Ivy_Obj_t ** Ivy_ObjNextPrevFanoutPlace( Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
+{
+    Ivy_Obj_t * pTemp;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_IsComplement(pFanout) );
+    pTemp = Ivy_ObjNextFanout(pObj, pFanout);
+    if ( pTemp == NULL )
+        return NULL;
+    if ( Ivy_ObjFanin0(pTemp) == pObj )
+        return &pTemp->pPrevFan0;
+    assert( Ivy_ObjFanin1(pTemp) == pObj );
+    return &pTemp->pPrevFan1;
+}
+
+// iterator through the fanouts of the node
+#define Ivy_ObjForEachFanoutInt( pObj, pFanout )                 \
+    for ( pFanout = (pObj)->pFanout; pFanout;                    \
+          pFanout = Ivy_ObjNextFanout(pObj, pFanout) )
+
+// safe iterator through the fanouts of the node
+#define Ivy_ObjForEachFanoutIntSafe( pObj, pFanout, pFanout2 )   \
+    for ( pFanout  = (pObj)->pFanout,                            \
+          pFanout2 = Ivy_ObjNextFanout(pObj, pFanout);           \
+          pFanout;                                               \
+          pFanout  = pFanout2,                                   \
+          pFanout2 = Ivy_ObjNextFanout(pObj, pFanout) )
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fanout representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManStartFanout( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( !p->fFanout );
+    p->fFanout = 1;
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( Ivy_ObjFanin0(pObj) )
+            Ivy_ObjAddFanout( p, Ivy_ObjFanin0(pObj), pObj );
+        if ( Ivy_ObjFanin1(pObj) )
+            Ivy_ObjAddFanout( p, Ivy_ObjFanin1(pObj), pObj );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the fanout representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManStopFanout( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( p->fFanout );
+    p->fFanout = 0;
+    Ivy_ManForEachObj( p, pObj, i )
+        pObj->pFanout = pObj->pNextFan0 = pObj->pNextFan1 = pObj->pPrevFan0 = pObj->pPrevFan1 = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Add the fanout.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjAddFanout( Ivy_Man_t * p, Ivy_Obj_t * pFanin, Ivy_Obj_t * pFanout )
+{
+    assert( p->fFanout );
+    if ( pFanin->pFanout )
+    {
+        *Ivy_ObjNextFanoutPlace(pFanin, pFanout) = pFanin->pFanout;
+        *Ivy_ObjPrevFanoutPlace(pFanin, pFanin->pFanout) = pFanout;
+    }
+    pFanin->pFanout = pFanout;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes the fanout.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjDeleteFanout( Ivy_Man_t * p, Ivy_Obj_t * pFanin, Ivy_Obj_t * pFanout )
+{
+    Ivy_Obj_t ** ppPlace1, ** ppPlace2, ** ppPlaceN;
+    assert( pFanin->pFanout != NULL );
+
+    ppPlace1 = Ivy_ObjNextFanoutPlace(pFanin, pFanout);
+    ppPlaceN = Ivy_ObjPrevNextFanoutPlace(pFanin, pFanout);
+    assert( *ppPlaceN == pFanout );
+    if ( ppPlaceN )
+        *ppPlaceN = *ppPlace1;
+
+    ppPlace2 = Ivy_ObjPrevFanoutPlace(pFanin, pFanout);
+    ppPlaceN = Ivy_ObjNextPrevFanoutPlace(pFanin, pFanout);
+    assert( ppPlaceN == NULL || *ppPlaceN == pFanout );
+    if ( ppPlaceN )
+        *ppPlaceN = *ppPlace2;
+
+    *ppPlace1 = NULL;
+    *ppPlace2 = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces the fanout of pOld to be pFanoutNew.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjPatchFanout( Ivy_Man_t * p, Ivy_Obj_t * pFanin, Ivy_Obj_t * pFanoutOld, Ivy_Obj_t * pFanoutNew )
+{
+    Ivy_Obj_t ** ppPlace;
+    ppPlace = Ivy_ObjPrevNextFanoutPlace(pFanin, pFanoutOld);
+    assert( *ppPlace == pFanoutOld );
+    if ( ppPlace )
+        *ppPlace = pFanoutNew;
+    ppPlace = Ivy_ObjNextPrevFanoutPlace(pFanin, pFanoutOld);
+    assert( ppPlace == NULL || *ppPlace == pFanoutOld );
+    if ( ppPlace )
+        *ppPlace = pFanoutNew;
+    // assuming that pFanoutNew already points to the next fanout
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts iteration through the fanouts.]
+
+  Description [Copies the currently available fanouts into the array.]
+               
+  SideEffects [Can be used while the fanouts are being removed.]
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjCollectFanouts( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Ptr_t * vArray )
+{
+    Ivy_Obj_t * pFanout;
+    assert( p->fFanout );
+    assert( !Ivy_IsComplement(pObj) );
+    Vec_PtrClear( vArray );
+    Ivy_ObjForEachFanoutInt( pObj, pFanout )
+        Vec_PtrPush( vArray, pFanout );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads one fanout.]
+
+  Description [Returns fanout if there is only one fanout.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjReadFirstFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    return pObj->pFanout;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reads one fanout.]
+
+  Description [Returns fanout if there is only one fanout.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjFanoutNum( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pFanout;
+    int Counter = 0;
+    Ivy_ObjForEachFanoutInt( pObj, pFanout )
+        Counter++;
+    return Counter;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyFastMap.c b/abc70930/src/aig/ivy/ivyFastMap.c
new file mode 100644
index 00000000..c4a043f2
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyFastMap.c
@@ -0,0 +1,1593 @@
+/**CFile****************************************************************
+
+  FileName    [ivyFastMap.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Fast FPGA mapping.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyFastMap.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+#define IVY_INFINITY   10000
+
+typedef struct Ivy_SuppMan_t_ Ivy_SuppMan_t;
+struct Ivy_SuppMan_t_ 
+{
+    int         nLimit;    // the limit on the number of inputs
+    int         nObjs;     // the number of entries
+    int         nSize;     // size of each entry in bytes
+    char *      pMem;      // memory allocated
+    Vec_Vec_t * vLuts;     // the array of nodes used in the mapping
+};
+
+typedef struct Ivy_Supp_t_ Ivy_Supp_t;
+struct Ivy_Supp_t_ 
+{
+    char        nSize;     // the number of support nodes
+    char        fMark;     // multipurpose mask
+    char        fMark2;    // multipurpose mask 
+    char        fMark3;    // multipurpose mask 
+    int         nRefs;     // the number of references
+    short       Delay;     // the delay of the node
+    short       DelayR;    // the reverse delay of the node
+    int         pArray[0]; // the support nodes
+};
+
+static inline Ivy_Supp_t * Ivy_ObjSupp( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )      
+{ 
+    return (Ivy_Supp_t *)(((Ivy_SuppMan_t*)pAig->pData)->pMem + pObj->Id * ((Ivy_SuppMan_t*)pAig->pData)->nSize); 
+}
+static inline Ivy_Supp_t * Ivy_ObjSuppStart( Ivy_Man_t * pAig, Ivy_Obj_t * pObj ) 
+{ 
+    Ivy_Supp_t * pSupp;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    pSupp->fMark = 0;
+    pSupp->Delay = 0;
+    pSupp->nSize = 1;
+    pSupp->pArray[0] = pObj->Id;
+    return pSupp;
+}
+
+static void Ivy_FastMapPrint( Ivy_Man_t * pAig, int Delay, int Area, int Time, char * pStr );
+static int  Ivy_FastMapDelay( Ivy_Man_t * pAig );
+static int  Ivy_FastMapArea( Ivy_Man_t * pAig );
+static void Ivy_FastMapNode( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit );
+static void Ivy_FastMapNodeArea( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit );
+static int  Ivy_FastMapMerge( Ivy_Supp_t * pSupp0, Ivy_Supp_t * pSupp1, Ivy_Supp_t * pSupp, int nLimit );
+static void Ivy_FastMapRequired( Ivy_Man_t * pAig, int Delay, int fSetInter );
+static void Ivy_FastMapRecover( Ivy_Man_t * pAig, int nLimit );
+static int  Ivy_FastMapNodeDelay( Ivy_Man_t * pAig, Ivy_Obj_t * pObj );
+static int  Ivy_FastMapNodeAreaRefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj );
+static int  Ivy_FastMapNodeAreaDerefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj );
+static void Ivy_FastMapNodeRecover( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld );
+static int  Ivy_FastMapNodeRef( Ivy_Man_t * pAig, Ivy_Obj_t * pObj );
+static int  Ivy_FastMapNodeDeref( Ivy_Man_t * pAig, Ivy_Obj_t * pObj );
+
+
+extern int s_MappingTime;
+extern int s_MappingMem;
+
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast K-LUT mapping of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapPerform( Ivy_Man_t * pAig, int nLimit, int fRecovery, int fVerbose )
+{
+    Ivy_SuppMan_t * pMan;
+    Ivy_Obj_t * pObj;
+    int i, Delay, Area, clk, clkTotal = clock();
+    // start the memory for supports
+    pMan = ALLOC( Ivy_SuppMan_t, 1 );
+    memset( pMan, 0, sizeof(Ivy_SuppMan_t) );
+    pMan->nLimit = nLimit;
+    pMan->nObjs  = Ivy_ManObjIdMax(pAig) + 1;
+    pMan->nSize  = sizeof(Ivy_Supp_t) + nLimit * sizeof(int);
+    pMan->pMem   = (char *)malloc( pMan->nObjs * pMan->nSize );
+    memset( pMan->pMem, 0, pMan->nObjs * pMan->nSize );
+    pMan->vLuts  = Vec_VecAlloc( 100 );
+    pAig->pData  = pMan;
+clk = clock();
+    // set the PI mapping
+    Ivy_ObjSuppStart( pAig, Ivy_ManConst1(pAig) );
+    Ivy_ManForEachPi( pAig, pObj, i )
+        Ivy_ObjSuppStart( pAig, pObj );
+    // iterate through all nodes in the topological order
+    Ivy_ManForEachNode( pAig, pObj, i )
+        Ivy_FastMapNode( pAig, pObj, nLimit );
+    // find the best arrival time and area
+    Delay = Ivy_FastMapDelay( pAig );
+    Area = Ivy_FastMapArea(pAig);
+    if ( fVerbose )
+        Ivy_FastMapPrint( pAig, Delay, Area, clock() - clk, "Delay oriented mapping: " );
+
+// 2-1-2 (doing 2-1-2-1-2 improves 0.5%)
+
+    if ( fRecovery )
+    {
+clk = clock();
+    Ivy_FastMapRequired( pAig, Delay, 0 );
+    // remap the nodes
+    Ivy_FastMapRecover( pAig, nLimit );
+    Delay = Ivy_FastMapDelay( pAig );
+    Area = Ivy_FastMapArea(pAig);
+    if ( fVerbose )
+        Ivy_FastMapPrint( pAig, Delay, Area, clock() - clk, "Area recovery 2       : " );
+
+clk = clock();
+    Ivy_FastMapRequired( pAig, Delay, 0 );
+    // iterate through all nodes in the topological order
+    Ivy_ManForEachNode( pAig, pObj, i )
+        Ivy_FastMapNodeArea( pAig, pObj, nLimit );
+    Delay = Ivy_FastMapDelay( pAig );
+    Area = Ivy_FastMapArea(pAig);
+    if ( fVerbose )
+        Ivy_FastMapPrint( pAig, Delay, Area, clock() - clk, "Area recovery 1       : " );
+
+clk = clock();
+    Ivy_FastMapRequired( pAig, Delay, 0 );
+    // remap the nodes
+    Ivy_FastMapRecover( pAig, nLimit );
+    Delay = Ivy_FastMapDelay( pAig );
+    Area = Ivy_FastMapArea(pAig);
+    if ( fVerbose )
+        Ivy_FastMapPrint( pAig, Delay, Area, clock() - clk, "Area recovery 2       : " );
+    }
+
+
+    s_MappingTime = clock() - clkTotal;
+    s_MappingMem = pMan->nObjs * pMan->nSize;
+/*
+    {
+        Vec_Ptr_t * vNodes;
+        vNodes = Vec_PtrAlloc( 100 );
+        Vec_VecForEachEntry( pMan->vLuts, pObj, i, k )
+            Vec_PtrPush( vNodes, pObj );
+        Ivy_ManShow( pAig, 0, vNodes );
+        Vec_PtrFree( vNodes );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans memory used for decomposition.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapStop( Ivy_Man_t * pAig )
+{
+    Ivy_SuppMan_t * p = pAig->pData;
+    Vec_VecFree( p->vLuts );
+    free( p->pMem );
+    free( p );
+    pAig->pData = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints statistics.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapPrint( Ivy_Man_t * pAig, int Delay, int Area, int Time, char * pStr )
+{
+    printf( "%s : Delay = %3d. Area = %6d. ", pStr, Delay, Area );
+    PRT( "Time", Time );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes delay after LUT mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapDelay( Ivy_Man_t * pAig )
+{
+    Ivy_Supp_t * pSupp;
+    Ivy_Obj_t * pObj;
+    int i, DelayMax = 0;
+    Ivy_ManForEachPo( pAig, pObj, i )
+    {
+        pObj = Ivy_ObjFanin0(pObj);
+        if ( !Ivy_ObjIsNode(pObj) )
+            continue;
+        pSupp = Ivy_ObjSupp( pAig, pObj );
+        if ( DelayMax < pSupp->Delay )
+            DelayMax = pSupp->Delay;
+    }
+    return DelayMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area after mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapArea_rec( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Vec_t * vLuts )
+{
+    Ivy_Supp_t * pSupp;
+    int i, Counter;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    // skip visited nodes and PIs
+    if ( pSupp->fMark || pSupp->nSize == 1 )
+        return 0;
+    pSupp->fMark = 1;
+    // compute the area of this node
+    Counter = 0;
+    for ( i = 0; i < pSupp->nSize; i++ )
+        Counter += Ivy_FastMapArea_rec( pAig, Ivy_ManObj(pAig, pSupp->pArray[i]), vLuts );
+    // add the node to the array of LUTs
+    Vec_VecPush( vLuts, pSupp->Delay, pObj );
+    return 1 + Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes area after mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapArea( Ivy_Man_t * pAig )
+{
+    Vec_Vec_t * vLuts;
+    Ivy_Obj_t * pObj;
+    int i, Counter = 0;
+    // get the array to store the nodes
+    vLuts = ((Ivy_SuppMan_t *)pAig->pData)->vLuts;
+    Vec_VecClear( vLuts );
+    // explore starting from each node
+    Ivy_ManForEachPo( pAig, pObj, i )
+        Counter += Ivy_FastMapArea_rec( pAig, Ivy_ObjFanin0(pObj), vLuts );
+    // clean the marks
+    Ivy_ManForEachNode( pAig, pObj, i )
+        Ivy_ObjSupp( pAig, pObj )->fMark = 0;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Ivy_ObjIsNodeInt1( Ivy_Obj_t * pObj )
+{
+    return Ivy_ObjIsNode(pObj) && Ivy_ObjRefs(pObj) == 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Ivy_ObjIsNodeInt2( Ivy_Obj_t * pObj )
+{
+    return Ivy_ObjIsNode(pObj) && Ivy_ObjRefs(pObj) <= 2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline void Vec_IntSelectSort( int * pArray, int nSize )
+{
+    int temp, i, j, best_i;
+    for ( i = 0; i < nSize-1; i++ )
+    {
+        best_i = i;
+        for ( j = i+1; j < nSize; j++ )
+            if ( pArray[j] < pArray[best_i] )
+                best_i = j;
+        temp = pArray[i]; 
+        pArray[i] = pArray[best_i]; 
+        pArray[best_i] = temp;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Vec_IntRemoveDup( int * pArray, int nSize )
+{
+    int i, k;
+    if ( nSize < 2 )
+        return nSize;
+    for ( i = k = 1; i < nSize; i++ )
+        if ( pArray[i] != pArray[i-1] )
+            pArray[k++] = pArray[i];
+    return k;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeArea2( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit )
+{
+    static int Store[32], StoreSize;
+    static char Supp0[16], Supp1[16];
+    static Ivy_Supp_t * pTemp0 = (Ivy_Supp_t *)Supp0;
+    static Ivy_Supp_t * pTemp1 = (Ivy_Supp_t *)Supp1;
+    Ivy_Obj_t * pFanin0, * pFanin1;
+    Ivy_Supp_t * pSupp0, * pSupp1, * pSupp;
+    int RetValue, DelayOld;
+    assert( nLimit <= 32 );
+    assert( Ivy_ObjIsNode(pObj) );
+    // get the fanins
+    pFanin0 = Ivy_ObjFanin0(pObj);
+    pFanin1 = Ivy_ObjFanin1(pObj);
+    // get the supports
+    pSupp0 = Ivy_ObjSupp( pAig, pFanin0 );
+    pSupp1 = Ivy_ObjSupp( pAig, pFanin1 );
+    pSupp  = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->fMark == 0 );
+    // get the old delay of the node
+    DelayOld = Ivy_FastMapNodeDelay(pAig, pObj);
+    assert( DelayOld <= pSupp->DelayR );
+    // copy the current cut
+    memcpy( Store, pSupp->pArray, sizeof(int) * pSupp->nSize );
+    StoreSize = pSupp->nSize;
+    // get the fanin support
+    if ( Ivy_ObjRefs(pFanin0) > 1 && pSupp0->Delay < pSupp->DelayR )
+    {
+        pSupp0 = pTemp0;
+        pSupp0->nSize = 1;
+        pSupp0->pArray[0] = Ivy_ObjFaninId0(pObj);
+    }
+    // get the fanin support
+    if ( Ivy_ObjRefs(pFanin1) > 1 && pSupp1->Delay < pSupp->DelayR )
+    {
+        pSupp1 = pTemp1;
+        pSupp1->nSize = 1;
+        pSupp1->pArray[0] = Ivy_ObjFaninId1(pObj);
+    }
+    // merge the cuts
+    if ( pSupp0->nSize < pSupp1->nSize )
+        RetValue = Ivy_FastMapMerge( pSupp1, pSupp0, pSupp, nLimit );
+    else
+        RetValue = Ivy_FastMapMerge( pSupp0, pSupp1, pSupp, nLimit );
+    if ( !RetValue )
+    {
+        pSupp->nSize = 2;
+        pSupp->pArray[0] = Ivy_ObjFaninId0(pObj);
+        pSupp->pArray[1] = Ivy_ObjFaninId1(pObj);
+    }
+    // check the resulting delay
+    pSupp->Delay = Ivy_FastMapNodeDelay(pAig, pObj);
+    if ( pSupp->Delay > pSupp->DelayR )
+    {
+        pSupp->nSize = StoreSize;
+        memcpy( pSupp->pArray, Store, sizeof(int) * pSupp->nSize );
+        pSupp->Delay = DelayOld;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeArea( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit )
+{
+    static int Store[32], StoreSize;
+    static char Supp0[16], Supp1[16];
+    static Ivy_Supp_t * pTemp0 = (Ivy_Supp_t *)Supp0;
+    static Ivy_Supp_t * pTemp1 = (Ivy_Supp_t *)Supp1;
+    Ivy_Obj_t * pFanin0, * pFanin1;
+    Ivy_Supp_t * pSupp0, * pSupp1, * pSupp;
+    int RetValue, DelayOld, RefsOld;
+    int AreaBef, AreaAft;
+    assert( nLimit <= 32 );
+    assert( Ivy_ObjIsNode(pObj) );
+    // get the fanins
+    pFanin0 = Ivy_ObjFanin0(pObj);
+    pFanin1 = Ivy_ObjFanin1(pObj);
+    // get the supports
+    pSupp0 = Ivy_ObjSupp( pAig, pFanin0 );
+    pSupp1 = Ivy_ObjSupp( pAig, pFanin1 );
+    pSupp  = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->fMark == 0 );
+
+    // get the area
+    if ( pSupp->nRefs == 0 )
+        AreaBef = Ivy_FastMapNodeAreaDerefed( pAig, pObj );
+    else
+        AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+//    if ( AreaBef == 1 )
+//        return;
+
+    // deref the cut if the node is refed
+    if ( pSupp->nRefs != 0 )
+        Ivy_FastMapNodeDeref( pAig, pObj );
+
+    // get the old delay of the node
+    DelayOld = Ivy_FastMapNodeDelay(pAig, pObj);
+    assert( DelayOld <= pSupp->DelayR );
+    // copy the current cut
+    memcpy( Store, pSupp->pArray, sizeof(int) * pSupp->nSize );
+    StoreSize = pSupp->nSize;
+    // get the fanin support
+    if ( Ivy_ObjRefs(pFanin0) > 2 && pSupp0->Delay < pSupp->DelayR )
+//    if ( pSupp0->nRefs > 0 && pSupp0->Delay < pSupp->DelayR ) // this leads to 2% worse results
+    {
+        pSupp0 = pTemp0;
+        pSupp0->nSize = 1;
+        pSupp0->pArray[0] = Ivy_ObjFaninId0(pObj);
+    }
+    // get the fanin support
+    if ( Ivy_ObjRefs(pFanin1) > 2 && pSupp1->Delay < pSupp->DelayR )
+//    if ( pSupp1->nRefs > 0 && pSupp1->Delay < pSupp->DelayR )
+    {
+        pSupp1 = pTemp1;
+        pSupp1->nSize = 1;
+        pSupp1->pArray[0] = Ivy_ObjFaninId1(pObj);
+    }
+    // merge the cuts
+    if ( pSupp0->nSize < pSupp1->nSize )
+        RetValue = Ivy_FastMapMerge( pSupp1, pSupp0, pSupp, nLimit );
+    else
+        RetValue = Ivy_FastMapMerge( pSupp0, pSupp1, pSupp, nLimit );
+    if ( !RetValue )
+    {
+        pSupp->nSize = 2;
+        pSupp->pArray[0] = Ivy_ObjFaninId0(pObj);
+        pSupp->pArray[1] = Ivy_ObjFaninId1(pObj);
+    }
+
+    // check the resulting delay
+    pSupp->Delay = Ivy_FastMapNodeDelay(pAig, pObj);
+
+    RefsOld = pSupp->nRefs; pSupp->nRefs = 0;
+    AreaAft = Ivy_FastMapNodeAreaDerefed( pAig, pObj );
+    pSupp->nRefs = RefsOld;
+
+    if ( AreaAft > AreaBef || pSupp->Delay > pSupp->DelayR )
+//    if ( pSupp->Delay > pSupp->DelayR )
+    {
+        pSupp->nSize = StoreSize;
+        memcpy( pSupp->pArray, Store, sizeof(int) * pSupp->nSize );
+        pSupp->Delay = DelayOld;
+//        printf( "-" );
+    }
+//    else
+//        printf( "+" );
+
+    if ( pSupp->nRefs != 0 )
+        Ivy_FastMapNodeRef( pAig, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fast mapping for one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNode( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit )
+{
+    Ivy_Supp_t * pSupp0, * pSupp1, * pSupp;
+    int fFaninParam = 2;
+    int RetValue;
+    assert( Ivy_ObjIsNode(pObj) );
+    // get the supports
+    pSupp0 = Ivy_ObjSupp( pAig, Ivy_ObjFanin0(pObj) );
+    pSupp1 = Ivy_ObjSupp( pAig, Ivy_ObjFanin1(pObj) );
+    pSupp  = Ivy_ObjSupp( pAig, pObj );
+    pSupp->fMark = 0;
+    // get the delays
+    if ( pSupp0->Delay == pSupp1->Delay )
+        pSupp->Delay = (pSupp0->Delay == 0) ? pSupp0->Delay + 1: pSupp0->Delay;
+    else if ( pSupp0->Delay > pSupp1->Delay )
+    {
+        pSupp->Delay = pSupp0->Delay;
+        pSupp1 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) );
+        pSupp1->pArray[0] = Ivy_ObjFaninId1(pObj);
+    }
+    else // if ( pSupp0->Delay < pSupp1->Delay )
+    {
+        pSupp->Delay = pSupp1->Delay;
+        pSupp0 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) );
+        pSupp0->pArray[0] = Ivy_ObjFaninId0(pObj);
+    }
+    // merge the cuts
+    if ( pSupp0->nSize < pSupp1->nSize )
+        RetValue = Ivy_FastMapMerge( pSupp1, pSupp0, pSupp, nLimit );
+    else
+        RetValue = Ivy_FastMapMerge( pSupp0, pSupp1, pSupp, nLimit );
+    if ( !RetValue )
+    {
+        pSupp->Delay++;
+        if ( fFaninParam == 2 )
+        {
+            pSupp->nSize = 2;
+            pSupp->pArray[0] = Ivy_ObjFaninId0(pObj);
+            pSupp->pArray[1] = Ivy_ObjFaninId1(pObj);
+        }
+        else if ( fFaninParam == 3 )
+        {
+            Ivy_Obj_t * pFanin0, * pFanin1, * pFaninA, * pFaninB;
+            pFanin0 = Ivy_ObjFanin0(pObj);
+            pFanin1 = Ivy_ObjFanin1(pObj);
+            pSupp->nSize = 0;
+            // process the first fanin
+            if ( Ivy_ObjIsNodeInt1(pFanin0) )
+            {
+                pFaninA = Ivy_ObjFanin0(pFanin0);
+                pFaninB = Ivy_ObjFanin1(pFanin0);
+                if ( Ivy_ObjIsNodeInt1(pFaninA) && Ivy_ObjIsNodeInt1(pFaninB) )
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin0);
+                else
+                {
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninA);
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninB);
+                }
+            }
+            else
+                pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin0);
+            // process the second fanin
+            if ( Ivy_ObjIsNodeInt1(pFanin1) )
+            {
+                pFaninA = Ivy_ObjFanin0(pFanin1);
+                pFaninB = Ivy_ObjFanin1(pFanin1);
+                if ( Ivy_ObjIsNodeInt1(pFaninA) && Ivy_ObjIsNodeInt1(pFaninB) )
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin1);
+                else
+                {
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninA);
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninB);
+                }
+            }
+            else
+                pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin1);
+            // sort the fanins
+            Vec_IntSelectSort( pSupp->pArray, pSupp->nSize );
+            pSupp->nSize = Vec_IntRemoveDup( pSupp->pArray, pSupp->nSize );
+            assert( pSupp->pArray[0] < pSupp->pArray[1] );
+        }
+        else if ( fFaninParam == 4 )
+        {
+            Ivy_Obj_t * pFanin0, * pFanin1, * pFaninA, * pFaninB;
+            pFanin0 = Ivy_ObjFanin0(pObj);
+            pFanin1 = Ivy_ObjFanin1(pObj);
+            pSupp->nSize = 0;
+            // consider the case when exactly one of them is internal
+            if ( Ivy_ObjIsNodeInt1(pFanin0) ^ Ivy_ObjIsNodeInt1(pFanin1) )
+            {
+                pSupp0 = Ivy_ObjSupp( pAig, Ivy_ObjFanin0(pObj) );
+                pSupp1 = Ivy_ObjSupp( pAig, Ivy_ObjFanin1(pObj) );
+                if ( Ivy_ObjIsNodeInt1(pFanin0) && pSupp0->nSize < nLimit )
+                {
+                    pSupp->Delay = IVY_MAX( pSupp0->Delay, pSupp1->Delay + 1 );
+                    pSupp1 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) );
+                    pSupp1->pArray[0] = Ivy_ObjId(pFanin1);
+                    // merge the cuts
+                    RetValue = Ivy_FastMapMerge( pSupp0, pSupp1, pSupp, nLimit );
+                    assert( RetValue );
+                    assert( pSupp->nSize > 1 );
+                    return;
+                }
+                if ( Ivy_ObjIsNodeInt1(pFanin1) && pSupp1->nSize < nLimit )
+                {
+                    pSupp->Delay = IVY_MAX( pSupp1->Delay, pSupp0->Delay + 1 );
+                    pSupp0 = Ivy_ObjSupp( pAig, Ivy_ManConst1(pAig) );
+                    pSupp0->pArray[0] = Ivy_ObjId(pFanin0);
+                    // merge the cuts
+                    RetValue = Ivy_FastMapMerge( pSupp1, pSupp0, pSupp, nLimit );
+                    assert( RetValue );
+                    assert( pSupp->nSize > 1 );
+                    return;
+                }
+            }
+            // process the first fanin
+            if ( Ivy_ObjIsNodeInt1(pFanin0) )
+            {
+                pFaninA = Ivy_ObjFanin0(pFanin0);
+                pFaninB = Ivy_ObjFanin1(pFanin0);
+                if ( Ivy_ObjIsNodeInt1(pFaninA) && Ivy_ObjIsNodeInt1(pFaninB) )
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin0);
+                else
+                {
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninA);
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninB);
+                }
+            }
+            else
+                pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin0);
+            // process the second fanin
+            if ( Ivy_ObjIsNodeInt1(pFanin1) )
+            {
+                pFaninA = Ivy_ObjFanin0(pFanin1);
+                pFaninB = Ivy_ObjFanin1(pFanin1);
+                if ( Ivy_ObjIsNodeInt1(pFaninA) && Ivy_ObjIsNodeInt1(pFaninB) )
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin1);
+                else
+                {
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninA);
+                    pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFaninB);
+                }
+            }
+            else
+                pSupp->pArray[pSupp->nSize++] = Ivy_ObjId(pFanin1);
+            // sort the fanins
+            Vec_IntSelectSort( pSupp->pArray, pSupp->nSize );
+            pSupp->nSize = Vec_IntRemoveDup( pSupp->pArray, pSupp->nSize );
+            assert( pSupp->pArray[0] < pSupp->pArray[1] );
+            assert( pSupp->nSize > 1 );
+        }
+    }
+    assert( pSupp->Delay > 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Merges two supports]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapMerge( Ivy_Supp_t * pSupp0, Ivy_Supp_t * pSupp1, Ivy_Supp_t * pSupp, int nLimit )
+{ 
+    int i, k, c;
+    assert( pSupp0->nSize >= pSupp1->nSize );
+    // the case of the largest cut sizes
+    if ( pSupp0->nSize == nLimit && pSupp1->nSize == nLimit )
+    {
+        for ( i = 0; i < pSupp0->nSize; i++ )
+            if ( pSupp0->pArray[i] != pSupp1->pArray[i] )
+                return 0;
+        for ( i = 0; i < pSupp0->nSize; i++ )
+            pSupp->pArray[i] = pSupp0->pArray[i];
+        pSupp->nSize = pSupp0->nSize;
+        return 1;
+    }
+    // the case when one of the cuts is the largest
+    if ( pSupp0->nSize == nLimit )
+    {
+        for ( i = 0; i < pSupp1->nSize; i++ )
+        {
+            for ( k = pSupp0->nSize - 1; k >= 0; k-- )
+                if ( pSupp0->pArray[k] == pSupp1->pArray[i] )
+                    break;
+            if ( k == -1 ) // did not find
+                return 0;
+        }
+        for ( i = 0; i < pSupp0->nSize; i++ )
+            pSupp->pArray[i] = pSupp0->pArray[i];
+        pSupp->nSize = pSupp0->nSize;
+        return 1;
+    }
+
+    // compare two cuts with different numbers
+    i = k = 0;
+    for ( c = 0; c < nLimit; c++ )
+    {
+        if ( k == pSupp1->nSize )
+        {
+            if ( i == pSupp0->nSize )
+            {
+                pSupp->nSize = c;
+                return 1;
+            }
+            pSupp->pArray[c] = pSupp0->pArray[i++];
+            continue;
+        }
+        if ( i == pSupp0->nSize )
+        {
+            if ( k == pSupp1->nSize )
+            {
+                pSupp->nSize = c;
+                return 1;
+            }
+            pSupp->pArray[c] = pSupp1->pArray[k++];
+            continue;
+        }
+        if ( pSupp0->pArray[i] < pSupp1->pArray[k] )
+        {
+            pSupp->pArray[c] = pSupp0->pArray[i++];
+            continue;
+        }
+        if ( pSupp0->pArray[i] > pSupp1->pArray[k] )
+        {
+            pSupp->pArray[c] = pSupp1->pArray[k++];
+            continue;
+        }
+        pSupp->pArray[c] = pSupp0->pArray[i++]; 
+        k++;
+    }
+    if ( i < pSupp0->nSize || k < pSupp1->nSize )
+        return 0;
+    pSupp->nSize = c;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates integer vector with the support of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapReadSupp( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Int_t * vLeaves )
+{
+    Ivy_Supp_t * pSupp;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    vLeaves->nCap   = 8;
+    vLeaves->nSize  = pSupp->nSize;
+    vLeaves->pArray = pSupp->pArray;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the required times of the intermediate nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapRequired_rec( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Ivy_Obj_t * pRoot, int DelayR )
+{
+    Ivy_Supp_t * pSupp;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    if ( pObj != pRoot && (pSupp->nRefs > 0 || Ivy_ObjIsCi(pObj)) )
+        return;
+    Ivy_FastMapRequired_rec( pAig, Ivy_ObjFanin0(pObj), pRoot, DelayR );
+    Ivy_FastMapRequired_rec( pAig, Ivy_ObjFanin1(pObj), pRoot, DelayR );
+//    assert( pObj == pRoot || pSupp->DelayR == IVY_INFINITY );
+    pSupp->DelayR = DelayR;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the required times for each node.]
+
+  Description [Sets reference counters for each node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapRequired( Ivy_Man_t * pAig, int Delay, int fSetInter )
+{
+    Vec_Vec_t * vLuts;
+    Vec_Ptr_t * vNodes;
+    Ivy_Obj_t * pObj;
+    Ivy_Supp_t * pSupp, * pSuppF;
+    int i, k, c;
+    // clean the required times
+    Ivy_ManForEachPi( pAig, pObj, i )
+    {
+        pSupp = Ivy_ObjSupp( pAig, pObj );
+        pSupp->DelayR = IVY_INFINITY;
+        pSupp->nRefs = 0;
+    }
+    Ivy_ManForEachNode( pAig, pObj, i )
+    {
+        pSupp = Ivy_ObjSupp( pAig, pObj );
+        pSupp->DelayR = IVY_INFINITY;
+        pSupp->nRefs = 0;
+    }
+    // set the required times of the POs
+    Ivy_ManForEachPo( pAig, pObj, i )
+    {
+        pSupp = Ivy_ObjSupp( pAig, Ivy_ObjFanin0(pObj) );
+        pSupp->DelayR = Delay;
+        pSupp->nRefs++;
+    }
+    // get the levelized nodes used in the mapping
+    vLuts = ((Ivy_SuppMan_t *)pAig->pData)->vLuts;
+    // propagate the required times
+    Vec_VecForEachLevelReverse( vLuts, vNodes, i )
+    Vec_PtrForEachEntry( vNodes, pObj, k )
+    {
+        pSupp = Ivy_ObjSupp( pAig, pObj );
+        assert( pSupp->nRefs > 0 );
+        for ( c = 0; c < pSupp->nSize; c++ )
+        {
+            pSuppF = Ivy_ObjSupp( pAig, Ivy_ManObj(pAig, pSupp->pArray[c]) );
+            pSuppF->DelayR = IVY_MIN( pSuppF->DelayR, pSupp->DelayR - 1 );
+            pSuppF->nRefs++;
+        }
+    }
+/*
+    // print out some of the required times
+    Ivy_ManForEachPi( pAig, pObj, i )
+    {
+        pSupp = Ivy_ObjSupp( pAig, pObj );
+        printf( "%d ", pSupp->DelayR );
+    }
+    printf( "\n" );    
+*/
+
+    if ( fSetInter )
+    {
+        // set the required times of the intermediate nodes
+        Vec_VecForEachLevelReverse( vLuts, vNodes, i )
+        Vec_PtrForEachEntry( vNodes, pObj, k )
+        {
+            pSupp = Ivy_ObjSupp( pAig, pObj );
+            Ivy_FastMapRequired_rec( pAig, pObj, pObj, pSupp->DelayR ); 
+        }
+        // make sure that all required times are assigned
+        Ivy_ManForEachNode( pAig, pObj, i )
+        {
+            pSupp = Ivy_ObjSupp( pAig, pObj );
+            assert( pSupp->DelayR < IVY_INFINITY );
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs area recovery for each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapRecover( Ivy_Man_t * pAig, int nLimit )
+{
+    Vec_Ptr_t * vFront, * vFrontOld;
+    Ivy_Obj_t * pObj;
+    int i;
+    vFront = Vec_PtrAlloc( nLimit );
+    vFrontOld = Vec_PtrAlloc( nLimit );
+    Ivy_ManCleanTravId( pAig );
+    // iterate through all nodes in the topological order
+    Ivy_ManForEachNode( pAig, pObj, i )
+        Ivy_FastMapNodeRecover( pAig, pObj, nLimit, vFront, vFrontOld );
+    Vec_PtrFree( vFrontOld );
+    Vec_PtrFree( vFront );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the delay of the cut rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeDelay( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSupp, * pSuppF;
+    int c, Delay = 0;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    for ( c = 0; c < pSupp->nSize; c++ )
+    {
+        pSuppF = Ivy_ObjSupp( pAig, Ivy_ManObj(pAig, pSupp->pArray[c]) );
+        Delay = IVY_MAX( Delay, pSuppF->Delay );
+    }
+    return 1 + Delay;
+}
+
+
+/**function*************************************************************
+
+  synopsis    [References the cut.]
+
+  description [This procedure is similar to the procedure NodeReclaim.]
+               
+  sideeffects []
+
+  seealso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeRef( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSupp, * pSuppF;
+    Ivy_Obj_t * pNodeChild;
+    int aArea, i;
+    // start the area of this cut
+    aArea = 1;
+    // go through the children
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->nSize > 1 );
+    for ( i = 0; i < pSupp->nSize; i++ )
+    {
+        pNodeChild = Ivy_ManObj(pAig, pSupp->pArray[i]);
+        pSuppF = Ivy_ObjSupp( pAig, pNodeChild );
+        assert( pSuppF->nRefs >= 0 );
+        if ( pSuppF->nRefs++ > 0 )  
+            continue;
+        if ( pSuppF->nSize == 1 ) 
+            continue;
+        aArea += Ivy_FastMapNodeRef( pAig, pNodeChild );
+    }
+    return aArea;
+}
+
+/**function*************************************************************
+
+  synopsis    [Dereferences the cut.]
+
+  description [This procedure is similar to the procedure NodeRecusiveDeref.]
+               
+  sideeffects []
+
+  seealso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeDeref( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSupp, * pSuppF;
+    Ivy_Obj_t * pNodeChild;
+    int aArea, i;
+    // start the area of this cut
+    aArea = 1;
+    // go through the children
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->nSize > 1 );
+    for ( i = 0; i < pSupp->nSize; i++ )
+    {
+        pNodeChild = Ivy_ManObj(pAig, pSupp->pArray[i]);
+        pSuppF = Ivy_ObjSupp( pAig, pNodeChild );
+        assert( pSuppF->nRefs > 0 );
+        if ( --pSuppF->nRefs > 0 )  
+            continue;
+        if ( pSuppF->nSize == 1 ) 
+            continue;
+        aArea += Ivy_FastMapNodeDeref( pAig, pNodeChild );
+    }
+    return aArea;
+}
+
+/**function*************************************************************
+
+  synopsis    [Computes the exact area associated with the cut.]
+
+  description []
+               
+  sideeffects []
+
+  seealso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeAreaRefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSupp;
+    int aResult, aResult2;
+    if ( Ivy_ObjIsCi(pObj) )
+        return 0;
+    assert( Ivy_ObjIsNode(pObj) );
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->nRefs > 0 );
+    aResult  = Ivy_FastMapNodeDeref( pAig, pObj );
+    aResult2 = Ivy_FastMapNodeRef( pAig, pObj );
+    assert( aResult == aResult2 );
+    return aResult;
+}
+
+/**function*************************************************************
+
+  synopsis    [Computes the exact area associated with the cut.]
+
+  description []
+               
+  sideeffects []
+
+  seealso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeAreaDerefed( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSupp;
+    int aResult, aResult2;
+    if ( Ivy_ObjIsCi(pObj) )
+        return 0;
+    assert( Ivy_ObjIsNode(pObj) );
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    assert( pSupp->nRefs == 0 );
+    aResult2 = Ivy_FastMapNodeRef( pAig, pObj );
+    aResult  = Ivy_FastMapNodeDeref( pAig, pObj );
+    assert( aResult == aResult2 );
+    return aResult;
+}
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of nodes with no external fanout.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapCutCost( Ivy_Man_t * pAig, Vec_Ptr_t * vFront )
+{
+    Ivy_Supp_t * pSuppF;
+    Ivy_Obj_t * pFanin;
+    int i, Counter = 0;
+    Vec_PtrForEachEntry( vFront, pFanin, i )
+    {
+        pSuppF = Ivy_ObjSupp( pAig, pFanin );
+        if ( pSuppF->nRefs == 0 )
+            Counter++;
+    }
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs area recovery for each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapMark_rec( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    if ( Ivy_ObjIsTravIdCurrent(pAig, pObj) )
+        return;
+    assert( Ivy_ObjIsNode(pObj) );
+    Ivy_FastMapMark_rec( pAig, Ivy_ObjFanin0(pObj) );
+    Ivy_FastMapMark_rec( pAig, Ivy_ObjFanin1(pObj) );
+    Ivy_ObjSetTravIdCurrent(pAig, pObj);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the number of fanins will grow.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeWillGrow( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pFanin0, * pFanin1;
+    assert( Ivy_ObjIsNode(pObj) );
+    pFanin0 = Ivy_ObjFanin0(pObj);
+    pFanin1 = Ivy_ObjFanin1(pObj);
+    return !Ivy_ObjIsTravIdCurrent(pAig, pFanin0) && !Ivy_ObjIsTravIdCurrent(pAig, pFanin1);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the increase in the number of fanins with no external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeFaninCost( Ivy_Man_t * pAig, Ivy_Obj_t * pObj )
+{
+    Ivy_Supp_t * pSuppF;
+    Ivy_Obj_t * pFanin;
+    int Counter = 0;
+    assert( Ivy_ObjIsNode(pObj) );
+    // check if the node has external refs
+    pSuppF = Ivy_ObjSupp( pAig, pObj );
+    if ( pSuppF->nRefs == 0 )
+        Counter--;
+    // increment the number of fanins without external refs
+    pFanin = Ivy_ObjFanin0(pObj);
+    pSuppF = Ivy_ObjSupp( pAig, pFanin );
+    if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) && pSuppF->nRefs == 0 )
+        Counter++;
+    // increment the number of fanins without external refs
+    pFanin = Ivy_ObjFanin1(pObj);
+    pSuppF = Ivy_ObjSupp( pAig, pFanin );
+    if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) && pSuppF->nRefs == 0 )
+        Counter++;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the frontier.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeFaninUpdate( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pFanin;
+    assert( Ivy_ObjIsNode(pObj) );
+    Vec_PtrRemove( vFront, pObj );
+    pFanin = Ivy_ObjFanin0(pObj);
+    if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) )
+    {
+        Ivy_ObjSetTravIdCurrent(pAig, pFanin);
+        Vec_PtrPush( vFront, pFanin );
+    }
+    pFanin = Ivy_ObjFanin1(pObj);
+    if ( !Ivy_ObjIsTravIdCurrent(pAig, pFanin) )
+    {
+        Ivy_ObjSetTravIdCurrent(pAig, pFanin);
+        Vec_PtrPush( vFront, pFanin );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compacts the number of external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeFaninCompact0( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pFanin;
+    int i;
+    Vec_PtrForEachEntry( vFront, pFanin, i )
+    {
+        if ( Ivy_ObjIsCi(pFanin) )
+            continue;
+        if ( Ivy_FastMapNodeWillGrow(pAig, pFanin) )
+            continue;
+        if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) <= 0 )
+        {
+            Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront );
+            return 1;
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compacts the number of external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeFaninCompact1( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pFanin;
+    int i;
+    Vec_PtrForEachEntry( vFront, pFanin, i )
+    {
+        if ( Ivy_ObjIsCi(pFanin) )
+            continue;
+        if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) < 0 )
+        {
+            Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront );
+            return 1;
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compacts the number of external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeFaninCompact2( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront )
+{
+    Ivy_Obj_t * pFanin;
+    int i;
+    Vec_PtrForEachEntry( vFront, pFanin, i )
+    {
+        if ( Ivy_ObjIsCi(pFanin) )
+            continue;
+        if ( Ivy_FastMapNodeFaninCost(pAig, pFanin) <= 0 )
+        {
+            Ivy_FastMapNodeFaninUpdate( pAig, pFanin, vFront );
+            return 1;
+        }
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compacts the number of external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FastMapNodeFaninCompact_int( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront )
+{
+    if ( Ivy_FastMapNodeFaninCompact0(pAig, pObj, nLimit, vFront) )
+        return 1;
+    if (  Vec_PtrSize(vFront) < nLimit && Ivy_FastMapNodeFaninCompact1(pAig, pObj, nLimit, vFront) )
+        return 1;
+    if ( Vec_PtrSize(vFront) < nLimit && Ivy_FastMapNodeFaninCompact2(pAig, pObj, nLimit, vFront) )
+        return 1;
+    assert( Vec_PtrSize(vFront) <= nLimit );
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compacts the number of external refs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeFaninCompact( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront )
+{
+    while ( Ivy_FastMapNodeFaninCompact_int( pAig, pObj, nLimit, vFront ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prepares node mapping.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodePrepare( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld )
+{
+    Ivy_Supp_t * pSupp;
+    Ivy_Obj_t * pFanin;
+    int i;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    // expand the cut downwards from the given place
+    Vec_PtrClear( vFront );
+    Vec_PtrClear( vFrontOld );
+    Ivy_ManIncrementTravId( pAig );
+    for ( i = 0; i < pSupp->nSize; i++ )
+    {
+        pFanin = Ivy_ManObj(pAig, pSupp->pArray[i]);
+        Vec_PtrPush( vFront, pFanin );
+        Vec_PtrPush( vFrontOld, pFanin );
+        Ivy_ObjSetTravIdCurrent( pAig, pFanin );
+    }
+    // mark the nodes in the cone
+    Ivy_FastMapMark_rec( pAig, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the frontier.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeUpdate( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, Vec_Ptr_t * vFront )
+{
+    Ivy_Supp_t * pSupp;
+    Ivy_Obj_t * pFanin;
+    int i;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    // deref node's cut
+    Ivy_FastMapNodeDeref( pAig, pObj );
+    // update the node's cut
+    pSupp->nSize = Vec_PtrSize(vFront);
+    Vec_PtrForEachEntry( vFront, pFanin, i )
+        pSupp->pArray[i] = pFanin->Id;
+    // ref the new cut
+    Ivy_FastMapNodeRef( pAig, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs area recovery for each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeRecover2( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld )
+{
+    Ivy_Supp_t * pSupp;
+    int CostBef, CostAft;
+    int AreaBef, AreaAft;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+//    if ( pSupp->nRefs == 0 )
+//        return;
+    if ( pSupp->nRefs == 0 )
+        AreaBef = Ivy_FastMapNodeAreaDerefed( pAig, pObj );
+    else
+        AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    // get the area
+    if ( AreaBef == 1 )
+        return;
+
+    if ( pSupp->nRefs == 0 )
+    {
+        pSupp->nRefs = 1000000;
+        Ivy_FastMapNodeRef( pAig, pObj );
+    }
+    // the cut is non-trivial
+    Ivy_FastMapNodePrepare( pAig, pObj, nLimit, vFront, vFrontOld );
+    // iteratively modify the cut
+    CostBef = Ivy_FastMapCutCost( pAig, vFront );
+    Ivy_FastMapNodeFaninCompact( pAig, pObj, nLimit, vFront );
+    CostAft = Ivy_FastMapCutCost( pAig, vFront );
+    assert( CostBef >= CostAft );
+    // update the node
+    Ivy_FastMapNodeUpdate( pAig, pObj, vFront );
+    // get the new area
+    AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    if ( AreaAft > AreaBef )
+    {
+        Ivy_FastMapNodeUpdate( pAig, pObj, vFrontOld );
+        AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+        assert( AreaAft == AreaBef );
+    }
+    if ( pSupp->nRefs == 1000000 )
+    {
+        pSupp->nRefs = 0;
+        Ivy_FastMapNodeDeref( pAig, pObj );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs area recovery for each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeRecover( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld )
+{
+    Ivy_Supp_t * pSupp;
+    int CostBef, CostAft;
+    int AreaBef, AreaAft;
+    int DelayOld;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    DelayOld = pSupp->Delay = Ivy_FastMapNodeDelay( pAig, pObj );
+    assert( pSupp->Delay <= pSupp->DelayR );
+    if ( pSupp->nRefs == 0 )
+        return;
+    // get the area
+    AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+//    if ( AreaBef == 1 )
+//        return;
+    if ( pObj->Id == 102 )
+    {
+        int x = 0;
+    }
+    // the cut is non-trivial
+    Ivy_FastMapNodePrepare( pAig, pObj, nLimit, vFront, vFrontOld );
+    // iteratively modify the cut
+    Ivy_FastMapNodeDeref( pAig, pObj );
+    CostBef = Ivy_FastMapCutCost( pAig, vFront );
+    Ivy_FastMapNodeFaninCompact( pAig, pObj, nLimit, vFront );
+    CostAft = Ivy_FastMapCutCost( pAig, vFront );
+    Ivy_FastMapNodeRef( pAig, pObj );
+    assert( CostBef >= CostAft );
+    // update the node
+    Ivy_FastMapNodeUpdate( pAig, pObj, vFront );
+    pSupp->Delay = Ivy_FastMapNodeDelay( pAig, pObj );
+    // get the new area
+    AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    if ( AreaAft > AreaBef || pSupp->Delay > pSupp->DelayR )
+    {
+        Ivy_FastMapNodeUpdate( pAig, pObj, vFrontOld );
+        AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+        assert( AreaAft == AreaBef );
+        pSupp->Delay = DelayOld;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs area recovery for each node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FastMapNodeRecover4( Ivy_Man_t * pAig, Ivy_Obj_t * pObj, int nLimit, Vec_Ptr_t * vFront, Vec_Ptr_t * vFrontOld )
+{
+    Ivy_Supp_t * pSupp;
+    int CostBef, CostAft;
+    int AreaBef, AreaAft;
+    int DelayOld;
+    pSupp = Ivy_ObjSupp( pAig, pObj );
+    DelayOld = pSupp->Delay = Ivy_FastMapNodeDelay( pAig, pObj );
+    assert( pSupp->Delay <= pSupp->DelayR );
+//    if ( pSupp->nRefs == 0 )
+//        return;
+//    AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    // get the area
+    if ( pSupp->nRefs == 0 )
+        AreaBef = Ivy_FastMapNodeAreaDerefed( pAig, pObj );
+    else
+        AreaBef = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    if ( AreaBef == 1 )
+        return;
+
+    if ( pSupp->nRefs == 0 )
+    {
+        pSupp->nRefs = 1000000;
+        Ivy_FastMapNodeRef( pAig, pObj );
+    }
+    // the cut is non-trivial
+    Ivy_FastMapNodePrepare( pAig, pObj, nLimit, vFront, vFrontOld );
+    // iteratively modify the cut
+    CostBef = Ivy_FastMapCutCost( pAig, vFront );
+    Ivy_FastMapNodeFaninCompact( pAig, pObj, nLimit, vFront );
+    CostAft = Ivy_FastMapCutCost( pAig, vFront );
+    assert( CostBef >= CostAft );
+    // update the node
+    Ivy_FastMapNodeUpdate( pAig, pObj, vFront );
+    pSupp->Delay = Ivy_FastMapNodeDelay( pAig, pObj );
+    // get the new area
+    AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+    if ( AreaAft > AreaBef || pSupp->Delay > pSupp->DelayR )
+    {
+        Ivy_FastMapNodeUpdate( pAig, pObj, vFrontOld );
+        AreaAft = Ivy_FastMapNodeAreaRefed( pAig, pObj );
+        assert( AreaAft == AreaBef );
+        pSupp->Delay = DelayOld;
+    }
+    if ( pSupp->nRefs == 1000000 )
+    {
+        pSupp->nRefs = 0;
+        Ivy_FastMapNodeDeref( pAig, pObj );
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyFraig.c b/abc70930/src/aig/ivy/ivyFraig.c
new file mode 100644
index 00000000..1ab91dd2
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyFraig.c
@@ -0,0 +1,2762 @@
+/**CFile****************************************************************
+
+  FileName    [ivyFraig.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Functional reduction of AIGs]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyFraig.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "satSolver.h"
+#include "extra.h"
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Ivy_FraigMan_t_        Ivy_FraigMan_t;
+typedef struct Ivy_FraigSim_t_        Ivy_FraigSim_t;
+typedef struct Ivy_FraigList_t_       Ivy_FraigList_t;
+
+struct Ivy_FraigList_t_
+{
+    Ivy_Obj_t *         pHead;
+    Ivy_Obj_t *         pTail;
+    int                 nItems;
+};
+
+struct Ivy_FraigSim_t_
+{
+    int                 Type;
+    Ivy_FraigSim_t *    pNext;
+    Ivy_FraigSim_t *    pFanin0;
+    Ivy_FraigSim_t *    pFanin1;
+    unsigned            pData[0];
+};
+
+struct Ivy_FraigMan_t_
+{
+    // general info 
+    Ivy_FraigParams_t * pParams;        // various parameters
+    // temporary backtrack limits because "sint64" cannot be defined in Ivy_FraigParams_t ...
+    sint64              nBTLimitGlobal; // global limit on the number of backtracks
+    sint64              nInsLimitGlobal;// global limit on the number of clause inspects
+    // AIG manager
+    Ivy_Man_t *         pManAig;        // the starting AIG manager
+    Ivy_Man_t *         pManFraig;      // the final AIG manager
+    // simulation information
+    int                 nSimWords;      // the number of words
+    char *              pSimWords;      // the simulation info
+    Ivy_FraigSim_t *    pSimStart;      // the list of simulation info for internal nodes
+    // counter example storage
+    int                 nPatWords;      // the number of words in the counter example
+    unsigned *          pPatWords;      // the counter example
+    int *               pPatScores;     // the scores of each pattern
+    // equivalence classes 
+    Ivy_FraigList_t     lClasses;       // equivalence classes
+    Ivy_FraigList_t     lCand;          // candidatates
+    int                 nPairs;         // the number of pairs of nodes
+    // equivalence checking
+    sat_solver *        pSat;           // SAT solver
+    int                 nSatVars;       // the number of variables currently used
+    Vec_Ptr_t *         vPiVars;        // the PIs of the cone used 
+    // other 
+    ProgressBar *       pProgress;
+    // statistics
+    int                 nSimRounds;
+    int                 nNodesMiter;
+    int                 nClassesZero;
+    int                 nClassesBeg;
+    int                 nClassesEnd;
+    int                 nPairsBeg;
+    int                 nPairsEnd;
+    int                 nSatCalls;
+    int                 nSatCallsSat;
+    int                 nSatCallsUnsat;
+    int                 nSatProof;
+    int                 nSatFails;
+    int                 nSatFailsReal;
+    // runtime
+    int                 timeSim;
+    int                 timeTrav;
+    int                 timeSat;
+    int                 timeSatUnsat;
+    int                 timeSatSat;
+    int                 timeSatFail;
+    int                 timeRef;
+    int                 timeTotal;
+    int                 time1;
+    int                 time2;
+};
+
+typedef struct Prove_ParamsStruct_t_      Prove_Params_t;
+struct Prove_ParamsStruct_t_
+{
+    // general parameters
+    int     fUseFraiging;          // enables fraiging
+    int     fUseRewriting;         // enables rewriting
+    int     fUseBdds;              // enables BDD construction when other methods fail
+    int     fVerbose;              // prints verbose stats
+    // iterations
+    int     nItersMax;             // the number of iterations
+    // mitering 
+    int     nMiteringLimitStart;   // starting mitering limit
+    float   nMiteringLimitMulti;   // multiplicative coefficient to increase the limit in each iteration
+    // rewriting 
+    int     nRewritingLimitStart;  // the number of rewriting iterations
+    float   nRewritingLimitMulti;  // multiplicative coefficient to increase the limit in each iteration
+    // fraiging 
+    int     nFraigingLimitStart;   // starting backtrack(conflict) limit
+    float   nFraigingLimitMulti;   // multiplicative coefficient to increase the limit in each iteration
+    // last-gasp BDD construction
+    int     nBddSizeLimit;         // the number of BDD nodes when construction is aborted
+    int     fBddReorder;           // enables dynamic BDD variable reordering
+    // last-gasp mitering
+    int     nMiteringLimitLast;    // final mitering limit
+    // global SAT solver limits
+    sint64  nTotalBacktrackLimit;  // global limit on the number of backtracks
+    sint64  nTotalInspectLimit;    // global limit on the number of clause inspects
+    // global resources applied
+    sint64  nTotalBacktracksMade;  // the total number of backtracks made
+    sint64  nTotalInspectsMade;    // the total number of inspects made
+};
+
+static inline Ivy_FraigSim_t * Ivy_ObjSim( Ivy_Obj_t * pObj )                            { return (Ivy_FraigSim_t *)pObj->pFanout;  }
+static inline Ivy_Obj_t * Ivy_ObjClassNodeLast( Ivy_Obj_t * pObj )                       { return pObj->pNextFan0;  }
+static inline Ivy_Obj_t * Ivy_ObjClassNodeRepr( Ivy_Obj_t * pObj )                       { return pObj->pNextFan0;  }
+static inline Ivy_Obj_t * Ivy_ObjClassNodeNext( Ivy_Obj_t * pObj )                       { return pObj->pNextFan1;  }
+static inline Ivy_Obj_t * Ivy_ObjNodeHashNext( Ivy_Obj_t * pObj )                        { return pObj->pPrevFan0;  }
+static inline Ivy_Obj_t * Ivy_ObjEquivListNext( Ivy_Obj_t * pObj )                       { return pObj->pPrevFan0;  }
+static inline Ivy_Obj_t * Ivy_ObjEquivListPrev( Ivy_Obj_t * pObj )                       { return pObj->pPrevFan1;  }
+static inline Ivy_Obj_t * Ivy_ObjFraig( Ivy_Obj_t * pObj )                               { return pObj->pEquiv;     }
+static inline int         Ivy_ObjSatNum( Ivy_Obj_t * pObj )                              { return (int)pObj->pNextFan0;         }
+static inline Vec_Ptr_t * Ivy_ObjFaninVec( Ivy_Obj_t * pObj )                            { return (Vec_Ptr_t *)pObj->pNextFan1; }
+
+static inline void        Ivy_ObjSetSim( Ivy_Obj_t * pObj, Ivy_FraigSim_t * pSim )       { pObj->pFanout = (Ivy_Obj_t *)pSim; }
+static inline void        Ivy_ObjSetClassNodeLast( Ivy_Obj_t * pObj, Ivy_Obj_t * pLast ) { pObj->pNextFan0 = pLast; }
+static inline void        Ivy_ObjSetClassNodeRepr( Ivy_Obj_t * pObj, Ivy_Obj_t * pRepr ) { pObj->pNextFan0 = pRepr; }
+static inline void        Ivy_ObjSetClassNodeNext( Ivy_Obj_t * pObj, Ivy_Obj_t * pNext ) { pObj->pNextFan1 = pNext; }
+static inline void        Ivy_ObjSetNodeHashNext( Ivy_Obj_t * pObj, Ivy_Obj_t * pNext )  { pObj->pPrevFan0 = pNext; }
+static inline void        Ivy_ObjSetEquivListNext( Ivy_Obj_t * pObj, Ivy_Obj_t * pNext ) { pObj->pPrevFan0 = pNext; }
+static inline void        Ivy_ObjSetEquivListPrev( Ivy_Obj_t * pObj, Ivy_Obj_t * pPrev ) { pObj->pPrevFan1 = pPrev; }
+static inline void        Ivy_ObjSetFraig( Ivy_Obj_t * pObj, Ivy_Obj_t * pNode )         { pObj->pEquiv    = pNode; }
+static inline void        Ivy_ObjSetSatNum( Ivy_Obj_t * pObj, int Num )                  { pObj->pNextFan0 = (Ivy_Obj_t *)Num;     }
+static inline void        Ivy_ObjSetFaninVec( Ivy_Obj_t * pObj, Vec_Ptr_t * vFanins )    { pObj->pNextFan1 = (Ivy_Obj_t *)vFanins; }
+
+static inline unsigned    Ivy_ObjRandomSim()                       { return (rand() << 24) ^ (rand() << 12) ^ rand(); }
+
+// iterate through equivalence classes
+#define Ivy_FraigForEachEquivClass( pList, pEnt )                 \
+    for ( pEnt = pList;                                           \
+          pEnt;                                                   \
+          pEnt = Ivy_ObjEquivListNext(pEnt) )
+#define Ivy_FraigForEachEquivClassSafe( pList, pEnt, pEnt2 )      \
+    for ( pEnt = pList,                                           \
+          pEnt2 = pEnt? Ivy_ObjEquivListNext(pEnt): NULL;         \
+          pEnt;                                                   \
+          pEnt = pEnt2,                                           \
+          pEnt2 = pEnt? Ivy_ObjEquivListNext(pEnt): NULL )
+// iterate through nodes in one class
+#define Ivy_FraigForEachClassNode( pClass, pEnt )                 \
+    for ( pEnt = pClass;                                          \
+          pEnt;                                                   \
+          pEnt = Ivy_ObjClassNodeNext(pEnt) )
+// iterate through nodes in the hash table
+#define Ivy_FraigForEachBinNode( pBin, pEnt )                     \
+    for ( pEnt = pBin;                                            \
+          pEnt;                                                   \
+          pEnt = Ivy_ObjNodeHashNext(pEnt) )
+
+static Ivy_FraigMan_t * Ivy_FraigStart( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams );
+static Ivy_FraigMan_t * Ivy_FraigStartSimple( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams );
+static Ivy_Man_t *   Ivy_FraigPerform_int( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams, sint64 nBTLimitGlobal, sint64 nInsLimitGlobal, sint64 * pnSatConfs, sint64 * pnSatInspects );
+static void          Ivy_FraigPrint( Ivy_FraigMan_t * p );
+static void          Ivy_FraigStop( Ivy_FraigMan_t * p );
+static void          Ivy_FraigSimulate( Ivy_FraigMan_t * p );
+static void          Ivy_FraigSweep( Ivy_FraigMan_t * p );
+static Ivy_Obj_t *   Ivy_FraigAnd( Ivy_FraigMan_t * p, Ivy_Obj_t * pObjOld );
+static int           Ivy_FraigNodesAreEquiv( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1 );
+static int           Ivy_FraigNodeIsConst( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj );
+static void          Ivy_FraigNodeAddToSolver( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1 );
+static int           Ivy_FraigSetActivityFactors( Ivy_FraigMan_t * p, Ivy_Obj_t * pOld, Ivy_Obj_t * pNew );
+static void          Ivy_FraigAddToPatScores( Ivy_FraigMan_t * p, Ivy_Obj_t * pClass, Ivy_Obj_t * pClassNew );
+static int           Ivy_FraigMiterStatus( Ivy_Man_t * pMan );
+static void          Ivy_FraigMiterProve( Ivy_FraigMan_t * p );
+static void          Ivy_FraigMiterPrint( Ivy_Man_t * pNtk, char * pString, int clk, int fVerbose );
+static int *         Ivy_FraigCreateModel( Ivy_FraigMan_t * p );
+
+static int Ivy_FraigNodesAreEquivBdd( Ivy_Obj_t * pObj1, Ivy_Obj_t * pObj2 );
+
+static sint64 s_nBTLimitGlobal = 0;
+static sint64 s_nInsLimitGlobal = 0;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the default solving parameters.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigParamsDefault( Ivy_FraigParams_t * pParams )
+{
+    memset( pParams, 0, sizeof(Ivy_FraigParams_t) );
+    pParams->nSimWords        =      32;  // the number of words in the simulation info
+    pParams->dSimSatur        =   0.005;  // the ratio of refined classes when saturation is reached
+    pParams->fPatScores       =       0;  // enables simulation pattern scoring
+    pParams->MaxScore         =      25;  // max score after which resimulation is used
+    pParams->fDoSparse        =       1;  // skips sparse functions
+//    pParams->dActConeRatio    =    0.05;  // the ratio of cone to be bumped
+//    pParams->dActConeBumpMax  =     5.0;  // the largest bump of activity
+    pParams->dActConeRatio    =     0.3;  // the ratio of cone to be bumped
+    pParams->dActConeBumpMax  =    10.0;  // the largest bump of activity
+
+    pParams->nBTLimitNode     =     100;  // conflict limit at a node
+    pParams->nBTLimitMiter    =  500000;  // conflict limit at an output
+//    pParams->nBTLimitGlobal   =       0;  // conflict limit global
+//    pParams->nInsLimitGlobal  =       0;  // inspection limit global
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs combinational equivalence checking for the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigProve( Ivy_Man_t ** ppManAig, void * pPars )
+{
+    Prove_Params_t * pParams = pPars;
+    Ivy_FraigParams_t Params, * pIvyParams = &Params; 
+    Ivy_Man_t * pManAig, * pManTemp;
+    int RetValue, nIter, clk, timeStart = clock();//, Counter;
+    sint64 nSatConfs, nSatInspects;
+
+    // start the network and parameters
+    pManAig = *ppManAig;
+    Ivy_FraigParamsDefault( pIvyParams );
+    pIvyParams->fVerbose = pParams->fVerbose;
+    pIvyParams->fProve = 1;
+
+    if ( pParams->fVerbose )
+    {
+        printf( "RESOURCE LIMITS: Iterations = %d. Rewriting = %s. Fraiging = %s.\n",
+            pParams->nItersMax, pParams->fUseRewriting? "yes":"no", pParams->fUseFraiging? "yes":"no" );
+        printf( "Mitering = %d (%3.1f).  Rewriting = %d (%3.1f).  Fraiging = %d (%3.1f).\n", 
+            pParams->nMiteringLimitStart,  pParams->nMiteringLimitMulti, 
+            pParams->nRewritingLimitStart, pParams->nRewritingLimitMulti,
+            pParams->nFraigingLimitStart,  pParams->nFraigingLimitMulti );
+        printf( "Mitering last = %d.\n", 
+            pParams->nMiteringLimitLast );
+    }
+
+    // if SAT only, solve without iteration
+    if ( !pParams->fUseRewriting && !pParams->fUseFraiging )
+    {
+        clk = clock();
+        pIvyParams->nBTLimitMiter = pParams->nMiteringLimitLast / Ivy_ManPoNum(pManAig);
+        pManAig = Ivy_FraigMiter( pManTemp = pManAig, pIvyParams );  Ivy_ManStop( pManTemp );
+        RetValue = Ivy_FraigMiterStatus( pManAig );
+        Ivy_FraigMiterPrint( pManAig, "SAT solving", clk, pParams->fVerbose );
+        *ppManAig = pManAig;
+        return RetValue;
+    }
+
+    if ( Ivy_ManNodeNum(pManAig) < 500 )
+    {
+        // run the first mitering
+        clk = clock();
+        pIvyParams->nBTLimitMiter = pParams->nMiteringLimitStart / Ivy_ManPoNum(pManAig);
+        pManAig = Ivy_FraigMiter( pManTemp = pManAig, pIvyParams );  Ivy_ManStop( pManTemp );
+        RetValue = Ivy_FraigMiterStatus( pManAig );
+        Ivy_FraigMiterPrint( pManAig, "SAT solving", clk, pParams->fVerbose );
+        if ( RetValue >= 0 )
+        {
+            *ppManAig = pManAig;
+            return RetValue;
+        }
+    }
+
+    // check the current resource limits
+    RetValue = -1;
+    for ( nIter = 0; nIter < pParams->nItersMax; nIter++ )
+    {
+        if ( pParams->fVerbose )
+        {
+            printf( "ITERATION %2d : Confs = %6d. FraigBTL = %3d. \n", nIter+1, 
+                 (int)(pParams->nMiteringLimitStart * pow(pParams->nMiteringLimitMulti,nIter)), 
+                 (int)(pParams->nFraigingLimitStart * pow(pParams->nFraigingLimitMulti,nIter)) );
+            fflush( stdout );
+        }
+
+        // try rewriting
+        if ( pParams->fUseRewriting )
+        { // bug in Ivy_NodeFindCutsAll() when leaves are identical!
+/*
+            clk = clock();
+            Counter = (int)(pParams->nRewritingLimitStart * pow(pParams->nRewritingLimitMulti,nIter));
+            pManAig = Ivy_ManRwsat( pManAig, 0 );  
+            RetValue = Ivy_FraigMiterStatus( pManAig );
+            Ivy_FraigMiterPrint( pManAig, "Rewriting  ", clk, pParams->fVerbose );
+*/
+        }
+        if ( RetValue >= 0 )
+            break;
+
+        // try fraiging followed by mitering
+        if ( pParams->fUseFraiging )
+        {
+            clk = clock();
+            pIvyParams->nBTLimitNode  = (int)(pParams->nFraigingLimitStart * pow(pParams->nFraigingLimitMulti,nIter));
+            pIvyParams->nBTLimitMiter = (int)(pParams->nMiteringLimitStart * pow(pParams->nMiteringLimitMulti,nIter)) / Ivy_ManPoNum(pManAig);
+            pManAig = Ivy_FraigPerform_int( pManTemp = pManAig, pIvyParams, pParams->nTotalBacktrackLimit, pParams->nTotalInspectLimit, &nSatConfs, &nSatInspects );  Ivy_ManStop( pManTemp );
+            RetValue = Ivy_FraigMiterStatus( pManAig );
+            Ivy_FraigMiterPrint( pManAig, "Fraiging   ", clk, pParams->fVerbose );
+        }
+        if ( RetValue >= 0 )
+            break;
+
+        // add to the number of backtracks and inspects
+        pParams->nTotalBacktracksMade += nSatConfs;
+        pParams->nTotalInspectsMade   += nSatInspects;
+        // check if global resource limit is reached
+        if ( (pParams->nTotalBacktrackLimit && pParams->nTotalBacktracksMade >= pParams->nTotalBacktrackLimit) ||
+             (pParams->nTotalInspectLimit   && pParams->nTotalInspectsMade   >= pParams->nTotalInspectLimit) )
+        {
+            printf( "Reached global limit on conflicts/inspects. Quitting.\n" );
+            *ppManAig = pManAig;
+            return -1;
+        }
+    }    
+
+    if ( RetValue < 0 )
+    {
+        if ( pParams->fVerbose )
+        {
+            printf( "Attempting SAT with conflict limit %d ...\n", pParams->nMiteringLimitLast );
+            fflush( stdout );
+        }
+        clk = clock();
+        pIvyParams->nBTLimitMiter = pParams->nMiteringLimitLast / Ivy_ManPoNum(pManAig);
+        if ( pParams->nTotalBacktrackLimit )
+            s_nBTLimitGlobal  = pParams->nTotalBacktrackLimit - pParams->nTotalBacktracksMade;
+        if ( pParams->nTotalInspectLimit )
+            s_nInsLimitGlobal = pParams->nTotalInspectLimit -   pParams->nTotalInspectsMade;        
+        pManAig = Ivy_FraigMiter( pManTemp = pManAig, pIvyParams );  Ivy_ManStop( pManTemp );
+        s_nBTLimitGlobal  = 0;
+        s_nInsLimitGlobal = 0;        
+        RetValue = Ivy_FraigMiterStatus( pManAig );
+        Ivy_FraigMiterPrint( pManAig, "SAT solving", clk, pParams->fVerbose );
+        // make sure that the sover never returns "undecided" when infinite resource limits are set
+        if( RetValue == -1 && pParams->nTotalInspectLimit == 0 &&
+            pParams->nTotalBacktrackLimit == 0 )
+        {
+            extern void Prove_ParamsPrint( Prove_Params_t * pParams );
+            Prove_ParamsPrint( pParams );
+            printf("ERROR: ABC has returned \"undecided\" in spite of no limits...\n");
+            exit(1);
+        }
+    }
+
+    // assign the model if it was proved by rewriting (const 1 miter)
+    if ( RetValue == 0 && pManAig->pData == NULL )
+    {
+        pManAig->pData = ALLOC( int, Ivy_ManPiNum(pManAig) );
+        memset( pManAig->pData, 0, sizeof(int) * Ivy_ManPiNum(pManAig) );
+    }
+    *ppManAig = pManAig;
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_FraigPerform_int( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams, sint64 nBTLimitGlobal, sint64 nInsLimitGlobal, sint64 * pnSatConfs, sint64 * pnSatInspects )
+{ 
+    Ivy_FraigMan_t * p;
+    Ivy_Man_t * pManAigNew;
+    int clk;
+    if ( Ivy_ManNodeNum(pManAig) == 0 )
+        return Ivy_ManDup(pManAig);
+clk = clock();
+    assert( Ivy_ManLatchNum(pManAig) == 0 );
+    p = Ivy_FraigStart( pManAig, pParams );
+    // set global limits
+    p->nBTLimitGlobal  = nBTLimitGlobal;
+    p->nInsLimitGlobal = nInsLimitGlobal; 
+    
+    Ivy_FraigSimulate( p );
+    Ivy_FraigSweep( p );
+    pManAigNew = p->pManFraig;
+p->timeTotal = clock() - clk;
+    if ( pnSatConfs )
+        *pnSatConfs = p->pSat? p->pSat->stats.conflicts : 0;
+    if ( pnSatInspects )
+        *pnSatInspects = p->pSat? p->pSat->stats.inspects : 0;
+    Ivy_FraigStop( p );
+    return pManAigNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_FraigPerform( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams )
+{
+    Ivy_FraigMan_t * p;
+    Ivy_Man_t * pManAigNew;
+    int clk;
+    if ( Ivy_ManNodeNum(pManAig) == 0 )
+        return Ivy_ManDup(pManAig);
+clk = clock();
+    assert( Ivy_ManLatchNum(pManAig) == 0 );
+    p = Ivy_FraigStart( pManAig, pParams );
+    Ivy_FraigSimulate( p );
+    Ivy_FraigSweep( p );
+    pManAigNew = p->pManFraig;
+p->timeTotal = clock() - clk;
+    Ivy_FraigStop( p );
+    return pManAigNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Applies brute-force SAT to the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_FraigMiter( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams )
+{
+    Ivy_FraigMan_t * p;
+    Ivy_Man_t * pManAigNew;
+    Ivy_Obj_t * pObj;
+    int i, clk;
+clk = clock();
+    assert( Ivy_ManLatchNum(pManAig) == 0 );
+    p = Ivy_FraigStartSimple( pManAig, pParams );
+    // set global limits
+    p->nBTLimitGlobal  = s_nBTLimitGlobal;
+    p->nInsLimitGlobal = s_nInsLimitGlobal; 
+    // duplicate internal nodes
+    Ivy_ManForEachNode( p->pManAig, pObj, i )
+        pObj->pEquiv = Ivy_And( p->pManFraig, Ivy_ObjChild0Equiv(pObj), Ivy_ObjChild1Equiv(pObj) );
+    // try to prove each output of the miter
+    Ivy_FraigMiterProve( p );
+    // add the POs
+    Ivy_ManForEachPo( p->pManAig, pObj, i )
+        Ivy_ObjCreatePo( p->pManFraig, Ivy_ObjChild0Equiv(pObj) );
+    // clean the new manager
+    Ivy_ManForEachObj( p->pManFraig, pObj, i )
+    {
+        if ( Ivy_ObjFaninVec(pObj) )
+            Vec_PtrFree( Ivy_ObjFaninVec(pObj) );
+        pObj->pNextFan0 = pObj->pNextFan1 = NULL;
+    }
+    // remove dangling nodes 
+    Ivy_ManCleanup( p->pManFraig );
+    pManAigNew = p->pManFraig;
+p->timeTotal = clock() - clk;
+
+//printf( "Final nodes = %6d. ", Ivy_ManNodeNum(pManAigNew) );
+//PRT( "Time", p->timeTotal );
+    Ivy_FraigStop( p );
+    return pManAigNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fraiging manager without simulation info.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_FraigMan_t * Ivy_FraigStartSimple( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams )
+{
+    Ivy_FraigMan_t * p;
+    // allocat the fraiging manager
+    p = ALLOC( Ivy_FraigMan_t, 1 );
+    memset( p, 0, sizeof(Ivy_FraigMan_t) );
+    p->pParams   = pParams;
+    p->pManAig   = pManAig;
+    p->pManFraig = Ivy_ManStartFrom( pManAig );
+    p->vPiVars   = Vec_PtrAlloc( 100 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_FraigMan_t * Ivy_FraigStart( Ivy_Man_t * pManAig, Ivy_FraigParams_t * pParams )
+{
+    Ivy_FraigMan_t * p;
+    Ivy_FraigSim_t * pSims;
+    Ivy_Obj_t * pObj;
+    int i, k, EntrySize;
+    // clean the fanout representation
+    Ivy_ManForEachObj( pManAig, pObj, i )
+//        pObj->pEquiv = pObj->pFanout = pObj->pNextFan0 = pObj->pNextFan1 = pObj->pPrevFan0 = pObj->pPrevFan1 = NULL;
+        assert( !pObj->pEquiv && !pObj->pFanout );
+    // allocat the fraiging manager
+    p = ALLOC( Ivy_FraigMan_t, 1 );
+    memset( p, 0, sizeof(Ivy_FraigMan_t) );
+    p->pParams   = pParams;
+    p->pManAig   = pManAig;
+    p->pManFraig = Ivy_ManStartFrom( pManAig );
+    // allocate simulation info
+    p->nSimWords    = pParams->nSimWords;
+//    p->pSimWords    = ALLOC( unsigned, Ivy_ManObjNum(pManAig) * p->nSimWords ); 
+    EntrySize    = sizeof(Ivy_FraigSim_t) + sizeof(unsigned) * p->nSimWords;
+    p->pSimWords = (char *)malloc( Ivy_ManObjNum(pManAig) * EntrySize ); 
+    memset( p->pSimWords, 0, EntrySize );
+    k = 0;
+    Ivy_ManForEachObj( pManAig, pObj, i )
+    {
+        pSims = (Ivy_FraigSim_t *)(p->pSimWords + EntrySize * k++);
+        pSims->pNext = NULL;
+        if ( Ivy_ObjIsNode(pObj) )
+        {
+            if ( p->pSimStart == NULL )
+                p->pSimStart = pSims;
+            else
+                ((Ivy_FraigSim_t *)(p->pSimWords + EntrySize * (k-2)))->pNext = pSims;
+            pSims->pFanin0 = Ivy_ObjSim( Ivy_ObjFanin0(pObj) );
+            pSims->pFanin1 = Ivy_ObjSim( Ivy_ObjFanin1(pObj) );
+            pSims->Type = (Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj)) << 2) | (Ivy_ObjFaninPhase(Ivy_ObjChild1(pObj)) << 1) | pObj->fPhase;
+        }
+        else
+        {
+            pSims->pFanin0 = NULL;
+            pSims->pFanin1 = NULL;
+            pSims->Type = 0;
+        }
+        Ivy_ObjSetSim( pObj, pSims );
+    }
+    assert( k == Ivy_ManObjNum(pManAig) );
+    // allocate storage for sim pattern
+    p->nPatWords = Ivy_BitWordNum( Ivy_ManPiNum(pManAig) );
+    p->pPatWords = ALLOC( unsigned, p->nPatWords ); 
+    p->pPatScores = ALLOC( int, 32 * p->nSimWords ); 
+    p->vPiVars   = Vec_PtrAlloc( 100 );
+    // set random number generator
+    srand( 0xABCABC );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigStop( Ivy_FraigMan_t * p )
+{
+    if ( p->pParams->fVerbose )
+        Ivy_FraigPrint( p );
+    if ( p->vPiVars ) Vec_PtrFree( p->vPiVars );
+    if ( p->pSat ) sat_solver_delete( p->pSat );
+    FREE( p->pPatScores );
+    FREE( p->pPatWords );
+    FREE( p->pSimWords );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints stats for the fraiging manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigPrint( Ivy_FraigMan_t * p )
+{
+    double nMemory;
+    nMemory = (double)Ivy_ManObjNum(p->pManAig)*p->nSimWords*sizeof(unsigned)/(1<<20);
+    printf( "SimWords = %d. Rounds = %d. Mem = %0.2f Mb.  ", p->nSimWords, p->nSimRounds, nMemory );
+    printf( "Classes: Beg = %d. End = %d.\n", p->nClassesBeg, p->nClassesEnd );
+    printf( "Limits: BTNode = %d. BTMiter = %d.\n", p->pParams->nBTLimitNode, p->pParams->nBTLimitMiter );
+    printf( "Proof = %d. Counter-example = %d. Fail = %d. FailReal = %d. Zero = %d.\n", 
+        p->nSatProof, p->nSatCallsSat, p->nSatFails, p->nSatFailsReal, p->nClassesZero );
+    printf( "Final = %d. Miter = %d. Total = %d. Mux = %d. (Exor = %d.) SatVars = %d.\n", 
+        Ivy_ManNodeNum(p->pManFraig), p->nNodesMiter, Ivy_ManNodeNum(p->pManAig), 0, 0, p->nSatVars );
+    if ( p->pSat ) Sat_SolverPrintStats( stdout, p->pSat );
+    PRT( "AIG simulation  ", p->timeSim  );
+    PRT( "AIG traversal   ", p->timeTrav  );
+    PRT( "SAT solving     ", p->timeSat   );
+    PRT( "    Unsat       ", p->timeSatUnsat );
+    PRT( "    Sat         ", p->timeSatSat   );
+    PRT( "    Fail        ", p->timeSatFail  );
+    PRT( "Class refining  ", p->timeRef   );
+    PRT( "TOTAL RUNTIME   ", p->timeTotal );
+    if ( p->time1 ) { PRT( "time1           ", p->time1 ); }
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Assigns random patterns to the PI node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeAssignRandom( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_FraigSim_t * pSims;
+    int i;
+    assert( Ivy_ObjIsPi(pObj) );
+    pSims = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        pSims->pData[i] = Ivy_ObjRandomSim();
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assigns constant patterns to the PI node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeAssignConst( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj, int fConst1 )
+{
+    Ivy_FraigSim_t * pSims;
+    int i;
+    assert( Ivy_ObjIsPi(pObj) );
+    pSims = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        pSims->pData[i] = fConst1? ~(unsigned)0 : 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assings random simulation info for the PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAssignRandom( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    Ivy_ManForEachPi( p->pManAig, pObj, i )
+        Ivy_NodeAssignRandom( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Assings distance-1 simulation info for the PIs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAssignDist1( Ivy_FraigMan_t * p, unsigned * pPat )
+{
+    Ivy_Obj_t * pObj;
+    int i, Limit;
+    Ivy_ManForEachPi( p->pManAig, pObj, i )
+    {
+        Ivy_NodeAssignConst( p, pObj, Ivy_InfoHasBit(pPat, i) );
+//        printf( "%d", Ivy_InfoHasBit(pPat, i) );
+    }
+//    printf( "\n" );
+
+    Limit = IVY_MIN( Ivy_ManPiNum(p->pManAig), p->nSimWords * 32 - 1 );
+    for ( i = 0; i < Limit; i++ )
+        Ivy_InfoXorBit( Ivy_ObjSim( Ivy_ManPi(p->pManAig,i) )->pData, i+1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation info is composed of all zeros.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeHasZeroSim( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_FraigSim_t * pSims;
+    int i;
+    pSims = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        if ( pSims->pData[i] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation info is composed of all zeros.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeComplementSim( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_FraigSim_t * pSims;
+    int i;
+    pSims = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        pSims->pData[i] = ~pSims->pData[i];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if simulation infos are equal.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCompareSims( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj0, Ivy_Obj_t * pObj1 )
+{
+    Ivy_FraigSim_t * pSims0, * pSims1;
+    int i;
+    pSims0 = Ivy_ObjSim(pObj0);
+    pSims1 = Ivy_ObjSim(pObj1);
+    for ( i = 0; i < p->nSimWords; i++ )
+        if ( pSims0->pData[i] != pSims1->pData[i] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeSimulateSim( Ivy_FraigMan_t * p, Ivy_FraigSim_t * pSims )
+{
+    unsigned * pData, * pData0, * pData1;
+    int i;
+    pData  = pSims->pData;
+    pData0 = pSims->pFanin0->pData;
+    pData1 = pSims->pFanin1->pData;
+    switch( pSims->Type )
+    {
+    case 0:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (pData0[i] & pData1[i]);
+        break;
+    case 1:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = ~(pData0[i] & pData1[i]);
+        break;
+    case 2:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (pData0[i] & ~pData1[i]);
+        break;
+    case 3:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (~pData0[i] | pData1[i]);
+        break;
+    case 4:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (~pData0[i] & pData1[i]);
+        break;
+    case 5:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (pData0[i] | ~pData1[i]);
+        break;
+    case 6:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = ~(pData0[i] | pData1[i]);
+        break;
+    case 7:
+        for ( i = 0; i < p->nSimWords; i++ )
+            pData[i] = (pData0[i] | pData1[i]);
+        break;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeSimulate( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_FraigSim_t * pSims, * pSims0, * pSims1;
+    int fCompl, fCompl0, fCompl1, i;
+    assert( !Ivy_IsComplement(pObj) );
+    // get hold of the simulation information
+    pSims  = Ivy_ObjSim(pObj);
+    pSims0 = Ivy_ObjSim(Ivy_ObjFanin0(pObj));
+    pSims1 = Ivy_ObjSim(Ivy_ObjFanin1(pObj));
+    // get complemented attributes of the children using their random info
+    fCompl  = pObj->fPhase;
+    fCompl0 = Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj));
+    fCompl1 = Ivy_ObjFaninPhase(Ivy_ObjChild1(pObj));
+    // simulate
+    if ( fCompl0 && fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (pSims0->pData[i] | pSims1->pData[i]);
+        else
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = ~(pSims0->pData[i] | pSims1->pData[i]);
+    }
+    else if ( fCompl0 && !fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (pSims0->pData[i] | ~pSims1->pData[i]);
+        else
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (~pSims0->pData[i] & pSims1->pData[i]);
+    }
+    else if ( !fCompl0 && fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (~pSims0->pData[i] | pSims1->pData[i]);
+        else
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (pSims0->pData[i] & ~pSims1->pData[i]);
+    }
+    else // if ( !fCompl0 && !fCompl1 )
+    {
+        if ( fCompl )
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = ~(pSims0->pData[i] & pSims1->pData[i]);
+        else
+            for ( i = 0; i < p->nSimWords; i++ )
+                pSims->pData[i] = (pSims0->pData[i] & pSims1->pData[i]);
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes hash value using simulation info.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_NodeHash( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{
+    static int s_FPrimes[128] = { 
+        1009, 1049, 1093, 1151, 1201, 1249, 1297, 1361, 1427, 1459, 
+        1499, 1559, 1607, 1657, 1709, 1759, 1823, 1877, 1933, 1997, 
+        2039, 2089, 2141, 2213, 2269, 2311, 2371, 2411, 2467, 2543, 
+        2609, 2663, 2699, 2741, 2797, 2851, 2909, 2969, 3037, 3089, 
+        3169, 3221, 3299, 3331, 3389, 3461, 3517, 3557, 3613, 3671, 
+        3719, 3779, 3847, 3907, 3943, 4013, 4073, 4129, 4201, 4243, 
+        4289, 4363, 4441, 4493, 4549, 4621, 4663, 4729, 4793, 4871, 
+        4933, 4973, 5021, 5087, 5153, 5227, 5281, 5351, 5417, 5471, 
+        5519, 5573, 5651, 5693, 5749, 5821, 5861, 5923, 6011, 6073, 
+        6131, 6199, 6257, 6301, 6353, 6397, 6481, 6563, 6619, 6689, 
+        6737, 6803, 6863, 6917, 6977, 7027, 7109, 7187, 7237, 7309, 
+        7393, 7477, 7523, 7561, 7607, 7681, 7727, 7817, 7877, 7933, 
+        8011, 8039, 8059, 8081, 8093, 8111, 8123, 8147
+    };
+    Ivy_FraigSim_t * pSims;
+    unsigned uHash;
+    int i;
+    assert( p->nSimWords <= 128 );
+    uHash = 0;
+    pSims  = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        uHash ^= pSims->pData[i] * s_FPrimes[i];
+    return uHash;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates AIG manager.]
+
+  Description [Assumes that the PI simulation info is attached.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSimulateOne( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i, clk;
+clk = clock();
+    Ivy_ManForEachNode( p->pManAig, pObj, i )
+    {
+        Ivy_NodeSimulate( p, pObj );
+/*
+        if ( Ivy_ObjFraig(pObj) == NULL )
+            printf( "%3d --- -- %d  :  ", pObj->Id, pObj->fPhase );
+        else
+            printf( "%3d %3d %2d %d  :  ", pObj->Id, Ivy_Regular(Ivy_ObjFraig(pObj))->Id, Ivy_ObjSatNum(Ivy_Regular(Ivy_ObjFraig(pObj))), pObj->fPhase );
+        Extra_PrintBinary( stdout, Ivy_ObjSim(pObj), 30 );
+        printf( "\n" );
+*/
+    }
+p->timeSim += clock() - clk;
+p->nSimRounds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulates AIG manager.]
+
+  Description [Assumes that the PI simulation info is attached.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSimulateOneSim( Ivy_FraigMan_t * p )
+{
+    Ivy_FraigSim_t * pSims;
+    int clk;
+clk = clock();
+    for ( pSims = p->pSimStart; pSims; pSims = pSims->pNext )
+        Ivy_NodeSimulateSim( p, pSims );
+p->timeSim += clock() - clk;
+p->nSimRounds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node to the equivalence class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeAddToClass( Ivy_Obj_t * pClass, Ivy_Obj_t * pObj )
+{
+    if ( Ivy_ObjClassNodeNext(pClass) == NULL )
+        Ivy_ObjSetClassNodeNext( pClass, pObj );
+    else
+        Ivy_ObjSetClassNodeNext( Ivy_ObjClassNodeLast(pClass), pObj );
+    Ivy_ObjSetClassNodeLast( pClass, pObj );
+    Ivy_ObjSetClassNodeRepr( pObj, pClass );
+    Ivy_ObjSetClassNodeNext( pObj, NULL );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds equivalence class to the list of classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAddClass( Ivy_FraigList_t * pList, Ivy_Obj_t * pClass )
+{
+    if ( pList->pHead == NULL )
+    {
+        pList->pHead = pClass;
+        pList->pTail = pClass;
+        Ivy_ObjSetEquivListPrev( pClass, NULL );
+        Ivy_ObjSetEquivListNext( pClass, NULL ); 
+    }
+    else
+    {
+        Ivy_ObjSetEquivListNext( pList->pTail, pClass ); 
+        Ivy_ObjSetEquivListPrev( pClass, pList->pTail );
+        Ivy_ObjSetEquivListNext( pClass, NULL ); 
+        pList->pTail = pClass;
+    }
+    pList->nItems++;
+}
+ 
+/**Function*************************************************************
+
+  Synopsis    [Updates the list of classes after base class has split.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigInsertClass( Ivy_FraigList_t * pList, Ivy_Obj_t * pBase, Ivy_Obj_t * pClass )
+{
+    Ivy_ObjSetEquivListPrev( pClass, pBase );
+    Ivy_ObjSetEquivListNext( pClass, Ivy_ObjEquivListNext(pBase) ); 
+    if ( Ivy_ObjEquivListNext(pBase) )
+        Ivy_ObjSetEquivListPrev( Ivy_ObjEquivListNext(pBase), pClass );
+    Ivy_ObjSetEquivListNext( pBase, pClass ); 
+    if ( pList->pTail == pBase )
+        pList->pTail = pClass;
+    pList->nItems++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes equivalence class from the list of classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigRemoveClass( Ivy_FraigList_t * pList, Ivy_Obj_t * pClass )
+{
+    if ( pList->pHead == pClass )
+        pList->pHead = Ivy_ObjEquivListNext(pClass);
+    if ( pList->pTail == pClass )
+        pList->pTail = Ivy_ObjEquivListPrev(pClass);
+    if ( Ivy_ObjEquivListPrev(pClass) )
+        Ivy_ObjSetEquivListNext( Ivy_ObjEquivListPrev(pClass), Ivy_ObjEquivListNext(pClass) ); 
+    if ( Ivy_ObjEquivListNext(pClass) )
+        Ivy_ObjSetEquivListPrev( Ivy_ObjEquivListNext(pClass), Ivy_ObjEquivListPrev(pClass) );
+    Ivy_ObjSetEquivListNext( pClass, NULL ); 
+    Ivy_ObjSetEquivListPrev( pClass, NULL );
+    pClass->fMarkA = 0;
+    pList->nItems--;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of pairs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigCountPairsClasses( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pClass, * pNode;
+    int nPairs = 0, nNodes;
+    return nPairs;
+
+    Ivy_FraigForEachEquivClass( p->lClasses.pHead, pClass )
+    {
+        nNodes = 0;
+        Ivy_FraigForEachClassNode( pClass, pNode )
+            nNodes++;
+        nPairs += nNodes * (nNodes - 1) / 2;
+    }
+    return nPairs;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates initial simulation classes.]
+
+  Description [Assumes that simulation info is assigned.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigCreateClasses( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t ** pTable;
+    Ivy_Obj_t * pObj, * pConst1, * pBin, * pEntry;
+    int i, nTableSize;
+    unsigned Hash;
+    pConst1 = Ivy_ManConst1(p->pManAig);
+    // allocate the table
+    nTableSize = Ivy_ManObjNum(p->pManAig) / 2 + 13;
+    pTable = ALLOC( Ivy_Obj_t *, nTableSize ); 
+    memset( pTable, 0, sizeof(Ivy_Obj_t *) * nTableSize );
+    // collect nodes into the table
+    Ivy_ManForEachObj( p->pManAig, pObj, i )
+    {
+        if ( !Ivy_ObjIsPi(pObj) && !Ivy_ObjIsNode(pObj) )
+            continue;
+        Hash = Ivy_NodeHash( p, pObj );
+        if ( Hash == 0 && Ivy_NodeHasZeroSim( p, pObj ) )
+        {
+            Ivy_NodeAddToClass( pConst1, pObj );
+            continue;
+        }
+        // add the node to the table
+        pBin = pTable[Hash % nTableSize];
+        Ivy_FraigForEachBinNode( pBin, pEntry )
+            if ( Ivy_NodeCompareSims( p, pEntry, pObj ) )
+            {
+                Ivy_NodeAddToClass( pEntry, pObj );
+                break;
+            }
+        // check if the entry was added
+        if ( pEntry )
+            continue;
+        Ivy_ObjSetNodeHashNext( pObj, pBin );
+        pTable[Hash % nTableSize] = pObj;
+    }
+    // collect non-trivial classes
+    assert( p->lClasses.pHead == NULL );
+    Ivy_ManForEachObj( p->pManAig, pObj, i )
+    {
+        if ( !Ivy_ObjIsConst1(pObj) && !Ivy_ObjIsPi(pObj) && !Ivy_ObjIsNode(pObj) )
+            continue;
+        Ivy_ObjSetNodeHashNext( pObj, NULL );
+        if ( Ivy_ObjClassNodeRepr(pObj) == NULL )
+        {
+            assert( Ivy_ObjClassNodeNext(pObj) == NULL );
+            continue;
+        }
+        // recognize the head of the class
+        if ( Ivy_ObjClassNodeNext( Ivy_ObjClassNodeRepr(pObj) ) != NULL )
+            continue;
+        // clean the class representative and add it to the list
+        Ivy_ObjSetClassNodeRepr( pObj, NULL );
+        Ivy_FraigAddClass( &p->lClasses, pObj );
+    }
+    // free the table
+    free( pTable );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively refines the class after simulation.]
+
+  Description [Returns 1 if the class has changed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigRefineClass_rec( Ivy_FraigMan_t * p, Ivy_Obj_t * pClass )
+{
+    Ivy_Obj_t * pClassNew, * pListOld, * pListNew, * pNode;
+    int RetValue = 0;
+    // check if there is refinement
+    pListOld = pClass;
+    Ivy_FraigForEachClassNode( Ivy_ObjClassNodeNext(pClass), pClassNew )
+    {
+        if ( !Ivy_NodeCompareSims(p, pClass, pClassNew) )
+        {
+            if ( p->pParams->fPatScores )
+                Ivy_FraigAddToPatScores( p, pClass, pClassNew );
+            break;
+        }
+        pListOld = pClassNew;
+    }
+    if ( pClassNew == NULL )
+        return 0;
+    // set representative of the new class
+    Ivy_ObjSetClassNodeRepr( pClassNew, NULL );
+    // start the new list
+    pListNew = pClassNew;
+    // go through the remaining nodes and sort them into two groups:
+    // (1) matches of the old node; (2) non-matches of the old node
+    Ivy_FraigForEachClassNode( Ivy_ObjClassNodeNext(pClassNew), pNode )
+        if ( Ivy_NodeCompareSims( p, pClass, pNode ) )
+        {
+            Ivy_ObjSetClassNodeNext( pListOld, pNode );
+            pListOld = pNode;
+        }
+        else
+        {
+            Ivy_ObjSetClassNodeNext( pListNew, pNode );
+            Ivy_ObjSetClassNodeRepr( pNode, pClassNew );
+            pListNew = pNode;
+        }
+    // finish both lists
+    Ivy_ObjSetClassNodeNext( pListNew, NULL );
+    Ivy_ObjSetClassNodeNext( pListOld, NULL );
+    // update the list of classes
+    Ivy_FraigInsertClass( &p->lClasses, pClass, pClassNew );
+    // if the old class is trivial, remove it
+    if ( Ivy_ObjClassNodeNext(pClass) == NULL )
+        Ivy_FraigRemoveClass( &p->lClasses, pClass );
+    // if the new class is trivial, remove it; otherwise, try to refine it
+    if ( Ivy_ObjClassNodeNext(pClassNew) == NULL )
+        Ivy_FraigRemoveClass( &p->lClasses, pClassNew );
+    else
+        RetValue = Ivy_FraigRefineClass_rec( p, pClassNew );
+    return RetValue + 1;
+}
+ 
+/**Function*************************************************************
+
+  Synopsis    [Creates the counter-example from the successful pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigCheckOutputSimsSavePattern( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj )
+{ 
+    Ivy_FraigSim_t * pSims;
+    int i, k, BestPat, * pModel;
+    // find the word of the pattern
+    pSims = Ivy_ObjSim(pObj);
+    for ( i = 0; i < p->nSimWords; i++ )
+        if ( pSims->pData[i] )
+            break;
+    assert( i < p->nSimWords );
+    // find the bit of the pattern
+    for ( k = 0; k < 32; k++ )
+        if ( pSims->pData[i] & (1 << k) )
+            break;
+    assert( k < 32 );
+    // determine the best pattern
+    BestPat = i * 32 + k;
+    // fill in the counter-example data
+    pModel = ALLOC( int, Ivy_ManPiNum(p->pManFraig) );
+    Ivy_ManForEachPi( p->pManAig, pObj, i )
+    {
+        pModel[i] = Ivy_InfoHasBit(Ivy_ObjSim(pObj)->pData, BestPat);
+//        printf( "%d", pModel[i] );
+    }
+//    printf( "\n" );
+    // set the model
+    assert( p->pManFraig->pData == NULL );
+    p->pManFraig->pData = pModel;
+    return;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the one of the output is already non-constant 0.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigCheckOutputSims( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    // make sure the reference simulation pattern does not detect the bug
+    pObj = Ivy_ManPo( p->pManAig, 0 );
+    assert( Ivy_ObjFanin0(pObj)->fPhase == (unsigned)Ivy_ObjFaninC0(pObj) ); // Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj)) == 0
+    Ivy_ManForEachPo( p->pManAig, pObj, i )
+    {
+        // complement simulation info
+//        if ( Ivy_ObjFanin0(pObj)->fPhase ^ Ivy_ObjFaninC0(pObj) ) // Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj))
+//            Ivy_NodeComplementSim( p, Ivy_ObjFanin0(pObj) );
+        // check 
+        if ( !Ivy_NodeHasZeroSim( p, Ivy_ObjFanin0(pObj) ) )
+        {
+            // create the counter-example from this pattern
+            Ivy_FraigCheckOutputSimsSavePattern( p, Ivy_ObjFanin0(pObj) );
+            return 1;
+        }
+        // complement simulation info
+//        if ( Ivy_ObjFanin0(pObj)->fPhase ^ Ivy_ObjFaninC0(pObj) )
+//            Ivy_NodeComplementSim( p, Ivy_ObjFanin0(pObj) );
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Refines the classes after simulation.]
+
+  Description [Assumes that simulation info is assigned. Returns the
+  number of classes refined.]
+               
+  SideEffects [Large equivalence class of constant 0 may cause problems.]
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigRefineClasses( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pClass, * pClass2;
+    int clk, RetValue, Counter = 0;
+    // check if some outputs already became non-constant
+    // this is a special case when computation can be stopped!!!
+    if ( p->pParams->fProve )
+        Ivy_FraigCheckOutputSims( p );
+    if ( p->pManFraig->pData )
+        return 0;
+    // refine the classed
+clk = clock();
+    Ivy_FraigForEachEquivClassSafe( p->lClasses.pHead, pClass, pClass2 )
+    {
+        if ( pClass->fMarkA )
+            continue;
+        RetValue = Ivy_FraigRefineClass_rec( p, pClass );
+        Counter += ( RetValue > 0 );
+//if ( Ivy_ObjIsConst1(pClass) )
+//printf( "%d ", RetValue );
+//if ( Ivy_ObjIsConst1(pClass) )
+//    p->time1 += clock() - clk;
+    }
+p->timeRef += clock() - clk;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigPrintClass( Ivy_Obj_t * pClass )
+{
+    Ivy_Obj_t * pObj;
+    printf( "Class {" );
+    Ivy_FraigForEachClassNode( pClass, pObj )
+        printf( " %d(%d)%c", pObj->Id, pObj->Level, pObj->fPhase? '+' : '-' );
+    printf( " }\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of elements in the class.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigCountClassNodes( Ivy_Obj_t * pClass )
+{
+    Ivy_Obj_t * pObj;
+    int Counter = 0;
+    Ivy_FraigForEachClassNode( pClass, pObj )
+        Counter++;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints simulation classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigPrintSimClasses( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pClass;
+    Ivy_FraigForEachEquivClass( p->lClasses.pHead, pClass )
+    {
+//        Ivy_FraigPrintClass( pClass );
+        printf( "%d ", Ivy_FraigCountClassNodes( pClass ) );
+    }
+//    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Generated const 0 pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSavePattern0( Ivy_FraigMan_t * p )
+{
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [[Generated const 1 pattern.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSavePattern1( Ivy_FraigMan_t * p )
+{
+    memset( p->pPatWords, 0xff, sizeof(unsigned) * p->nPatWords );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Generates the counter-example satisfying the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int * Ivy_FraigCreateModel( Ivy_FraigMan_t * p )
+{
+    int * pModel;
+    Ivy_Obj_t * pObj;
+    int i;
+    pModel = ALLOC( int, Ivy_ManPiNum(p->pManFraig) );
+    Ivy_ManForEachPi( p->pManFraig, pObj, i )
+        pModel[i] = ( p->pSat->model.ptr[Ivy_ObjSatNum(pObj)] == l_True );
+    return pModel;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Copy pattern from the solver into the internal storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSavePattern( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+    Ivy_ManForEachPi( p->pManFraig, pObj, i )
+//    Vec_PtrForEachEntry( p->vPiVars, pObj, i )
+        if ( p->pSat->model.ptr[Ivy_ObjSatNum(pObj)] == l_True )
+            Ivy_InfoSetBit( p->pPatWords, i );
+//            Ivy_InfoSetBit( p->pPatWords, pObj->Id - 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Copy pattern from the solver into the internal storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSavePattern2( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+//    Ivy_ManForEachPi( p->pManFraig, pObj, i )
+    Vec_PtrForEachEntry( p->vPiVars, pObj, i )
+        if ( p->pSat->model.ptr[Ivy_ObjSatNum(pObj)] == l_True )
+//            Ivy_InfoSetBit( p->pPatWords, i );
+            Ivy_InfoSetBit( p->pPatWords, pObj->Id - 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Copy pattern from the solver into the internal storage.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSavePattern3( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    for ( i = 0; i < p->nPatWords; i++ )
+        p->pPatWords[i] = Ivy_ObjRandomSim();
+    Vec_PtrForEachEntry( p->vPiVars, pObj, i )
+        if ( Ivy_InfoHasBit( p->pPatWords, pObj->Id - 1 ) ^ (p->pSat->model.ptr[Ivy_ObjSatNum(pObj)] == l_True) )
+            Ivy_InfoXorBit( p->pPatWords, pObj->Id - 1 );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Performs simulation of the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSimulate( Ivy_FraigMan_t * p )
+{
+    int nChanges, nClasses;
+    // start the classes
+    Ivy_FraigAssignRandom( p );
+    Ivy_FraigSimulateOne( p );
+    Ivy_FraigCreateClasses( p );
+//printf( "Starting classes = %5d.   Pairs = %6d.\n", p->lClasses.nItems, Ivy_FraigCountPairsClasses(p) );
+    // refine classes by walking 0/1 patterns
+    Ivy_FraigSavePattern0( p );
+    Ivy_FraigAssignDist1( p, p->pPatWords );
+    Ivy_FraigSimulateOne( p );
+    nChanges = Ivy_FraigRefineClasses( p );
+    if ( p->pManFraig->pData )
+        return;
+//printf( "Refined classes  = %5d.   Changes = %4d.   Pairs = %6d.\n", p->lClasses.nItems, nChanges, Ivy_FraigCountPairsClasses(p) );
+    Ivy_FraigSavePattern1( p );
+    Ivy_FraigAssignDist1( p, p->pPatWords );
+    Ivy_FraigSimulateOne( p );
+    nChanges = Ivy_FraigRefineClasses( p );
+    if ( p->pManFraig->pData )
+        return;
+//printf( "Refined classes  = %5d.   Changes = %4d.   Pairs = %6d.\n", p->lClasses.nItems, nChanges, Ivy_FraigCountPairsClasses(p) );
+    // refine classes by random simulation
+    do {
+        Ivy_FraigAssignRandom( p );
+        Ivy_FraigSimulateOne( p );
+        nClasses = p->lClasses.nItems;
+        nChanges = Ivy_FraigRefineClasses( p );
+        if ( p->pManFraig->pData )
+            return;
+//printf( "Refined classes  = %5d.   Changes = %4d.   Pairs = %6d.\n", p->lClasses.nItems, nChanges, Ivy_FraigCountPairsClasses(p) );
+    } while ( (double)nChanges / nClasses > p->pParams->dSimSatur );
+//    Ivy_FraigPrintSimClasses( p );
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Cleans pattern scores.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigCleanPatScores( Ivy_FraigMan_t * p )
+{
+    int i, nLimit = p->nSimWords * 32;
+    for ( i = 0; i < nLimit; i++ )
+        p->pPatScores[i] = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds to pattern scores.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAddToPatScores( Ivy_FraigMan_t * p, Ivy_Obj_t * pClass, Ivy_Obj_t * pClassNew )
+{
+    Ivy_FraigSim_t * pSims0, * pSims1;
+    unsigned uDiff;
+    int i, w;
+    // get hold of the simulation information
+    pSims0 = Ivy_ObjSim(pClass);
+    pSims1 = Ivy_ObjSim(pClassNew);
+    // iterate through the differences and record the score
+    for ( w = 0; w < p->nSimWords; w++ )
+    {
+        uDiff = pSims0->pData[w] ^ pSims1->pData[w];
+        if ( uDiff == 0 )
+            continue;
+        for ( i = 0; i < 32; i++ )
+            if ( uDiff & ( 1 << i ) )
+                p->pPatScores[w*32+i]++;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Selects the best pattern.]
+
+  Description [Returns 1 if such pattern is found.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigSelectBestPat( Ivy_FraigMan_t * p )
+{
+    Ivy_FraigSim_t * pSims;
+    Ivy_Obj_t * pObj;
+    int i, nLimit = p->nSimWords * 32, MaxScore = 0, BestPat = -1;
+    for ( i = 1; i < nLimit; i++ )
+    {
+        if ( MaxScore < p->pPatScores[i] )
+        {
+            MaxScore = p->pPatScores[i];
+            BestPat = i;
+        }
+    }
+    if ( MaxScore == 0 )
+        return 0;
+//    if ( MaxScore > p->pParams->MaxScore )
+//    printf( "Max score is %3d.  ", MaxScore );
+    // copy the best pattern into the selected pattern
+    memset( p->pPatWords, 0, sizeof(unsigned) * p->nPatWords );
+    Ivy_ManForEachPi( p->pManAig, pObj, i )
+    {
+        pSims = Ivy_ObjSim(pObj);
+        if ( Ivy_InfoHasBit(pSims->pData, BestPat) )
+            Ivy_InfoSetBit(p->pPatWords, i);
+    }
+    return MaxScore;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Resimulates fraiging manager after finding a counter-example.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigResimulate( Ivy_FraigMan_t * p )
+{
+    int nChanges;
+    Ivy_FraigAssignDist1( p, p->pPatWords );
+    Ivy_FraigSimulateOne( p );
+    if ( p->pParams->fPatScores )
+        Ivy_FraigCleanPatScores( p );
+    nChanges = Ivy_FraigRefineClasses( p );
+    if ( p->pManFraig->pData )
+        return;
+    if ( nChanges < 1 )
+        printf( "Error: A counter-example did not refine classes!\n" );
+    assert( nChanges >= 1 );
+//printf( "Refined classes! = %5d.   Changes = %4d.\n", p->lClasses.nItems, nChanges );
+    if ( !p->pParams->fPatScores )
+        return;
+
+    // perform additional simulation using dist1 patterns derived from successful patterns
+    while ( Ivy_FraigSelectBestPat(p) > p->pParams->MaxScore )
+    {
+        Ivy_FraigAssignDist1( p, p->pPatWords );
+        Ivy_FraigSimulateOne( p );
+        Ivy_FraigCleanPatScores( p );
+        nChanges = Ivy_FraigRefineClasses( p );
+        if ( p->pManFraig->pData )
+            return;
+//printf( "Refined class!!! = %5d.   Changes = %4d.   Pairs = %6d.\n", p->lClasses.nItems, nChanges, Ivy_FraigCountPairsClasses(p) );
+        if ( nChanges == 0 )
+            break;
+    }
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the status of the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigMiterPrint( Ivy_Man_t * pNtk, char * pString, int clk, int fVerbose )
+{
+    if ( !fVerbose )
+        return;
+    printf( "Nodes = %7d.  Levels = %4d.  ", Ivy_ManNodeNum(pNtk), Ivy_ManLevels(pNtk) );
+    PRT( pString, clock() - clk );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Reports the status of the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigMiterStatus( Ivy_Man_t * pMan )
+{
+    Ivy_Obj_t * pObj, * pObjNew;
+    int i, CountConst0 = 0, CountNonConst0 = 0, CountUndecided = 0;
+    if ( pMan->pData )
+        return 0;
+    Ivy_ManForEachPo( pMan, pObj, i )
+    {
+        pObjNew = Ivy_ObjChild0(pObj);
+        // check if the output is constant 1
+        if ( pObjNew == pMan->pConst1 )
+        {
+            CountNonConst0++;
+            continue;
+        }
+        // check if the output is constant 0
+        if ( pObjNew == Ivy_Not(pMan->pConst1) )
+        {
+            CountConst0++;
+            continue;
+        }
+        // check if the output can be constant 0
+        if ( Ivy_Regular(pObjNew)->fPhase != (unsigned)Ivy_IsComplement(pObjNew) )
+        {
+            CountNonConst0++;
+            continue;
+        }
+        CountUndecided++;
+    }
+/*
+    if ( p->pParams->fVerbose )
+    {
+        printf( "Miter has %d outputs. ", Ivy_ManPoNum(p->pManAig) );
+        printf( "Const0 = %d.  ", CountConst0 );
+        printf( "NonConst0 = %d.  ", CountNonConst0 );
+        printf( "Undecided = %d.  ", CountUndecided );
+        printf( "\n" );
+    }
+*/
+    if ( CountNonConst0 )
+        return 0;
+    if ( CountUndecided )
+        return -1;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Tries to prove each output of the miter until encountering a sat output.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigMiterProve( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj, * pObjNew;
+    int i, RetValue, clk = clock();
+    int fVerbose = 0;
+    Ivy_ManForEachPo( p->pManAig, pObj, i )
+    {
+        if ( i && fVerbose )
+        {
+            PRT( "Time", clock() -clk );
+        }
+        pObjNew = Ivy_ObjChild0Equiv(pObj);
+        // check if the output is constant 1
+        if ( pObjNew == p->pManFraig->pConst1 )
+        {
+            if ( fVerbose )
+                printf( "Output %2d (out of %2d) is constant 1.  ", i, Ivy_ManPoNum(p->pManAig) );
+            // assing constant 0 model
+            p->pManFraig->pData = ALLOC( int, Ivy_ManPiNum(p->pManFraig) );
+            memset( p->pManFraig->pData, 0, sizeof(int) * Ivy_ManPiNum(p->pManFraig) );
+            break;
+        }
+        // check if the output is constant 0
+        if ( pObjNew == Ivy_Not(p->pManFraig->pConst1) )
+        {
+            if ( fVerbose )
+                printf( "Output %2d (out of %2d) is already constant 0.  ", i, Ivy_ManPoNum(p->pManAig) );
+            continue;
+        }
+        // check if the output can be constant 0
+        if ( Ivy_Regular(pObjNew)->fPhase != (unsigned)Ivy_IsComplement(pObjNew) )
+        {
+            if ( fVerbose )
+                printf( "Output %2d (out of %2d) cannot be constant 0.  ", i, Ivy_ManPoNum(p->pManAig) );
+            // assing constant 0 model
+            p->pManFraig->pData = ALLOC( int, Ivy_ManPiNum(p->pManFraig) );
+            memset( p->pManFraig->pData, 0, sizeof(int) * Ivy_ManPiNum(p->pManFraig) );
+            break;
+        }
+/*
+        // check the representative of this node
+        pRepr = Ivy_ObjClassNodeRepr(Ivy_ObjFanin0(pObj));
+        if ( Ivy_Regular(pRepr) != p->pManAig->pConst1 )
+            printf( "Representative is not constant 1.\n" );
+        else
+            printf( "Representative is constant 1.\n" );
+*/
+        // try to prove the output constant 0
+        RetValue = Ivy_FraigNodeIsConst( p, Ivy_Regular(pObjNew) );
+        if ( RetValue == 1 )  // proved equivalent
+        {
+            if ( fVerbose )
+                printf( "Output %2d (out of %2d) was proved constant 0.  ", i, Ivy_ManPoNum(p->pManAig) );
+            // set the constant miter
+            Ivy_ObjFanin0(pObj)->pEquiv = Ivy_NotCond( p->pManFraig->pConst1, !Ivy_ObjFaninC0(pObj) );
+            continue;
+        }
+        if ( RetValue == -1 ) // failed
+        {
+            if ( fVerbose )
+                printf( "Output %2d (out of %2d) has timed out at %d backtracks.  ", i, Ivy_ManPoNum(p->pManAig), p->pParams->nBTLimitMiter );
+            continue;
+        }
+        // proved satisfiable
+        if ( fVerbose )
+            printf( "Output %2d (out of %2d) was proved NOT a constant 0.  ", i, Ivy_ManPoNum(p->pManAig) );
+        // create the model
+        p->pManFraig->pData = Ivy_FraigCreateModel(p);
+        break;
+    }
+    if ( fVerbose )
+    {
+        PRT( "Time", clock() -clk );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging for the internal nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigSweep( Ivy_FraigMan_t * p )
+{
+    Ivy_Obj_t * pObj;//, * pTemp;
+    int i, k = 0;
+p->nClassesZero = p->lClasses.pHead? (Ivy_ObjIsConst1(p->lClasses.pHead) ? Ivy_FraigCountClassNodes(p->lClasses.pHead) : 0) : 0;
+p->nClassesBeg  = p->lClasses.nItems;
+    // duplicate internal nodes
+    p->pProgress = Extra_ProgressBarStart( stdout, Ivy_ManNodeNum(p->pManAig) );
+    Ivy_ManForEachNode( p->pManAig, pObj, i )
+    {
+        Extra_ProgressBarUpdate( p->pProgress, k++, NULL );
+        // default to simple strashing if simulation detected a counter-example for a PO
+        if ( p->pManFraig->pData )
+            pObj->pEquiv = Ivy_And( p->pManFraig, Ivy_ObjChild0Equiv(pObj), Ivy_ObjChild1Equiv(pObj) );
+        else
+            pObj->pEquiv = Ivy_FraigAnd( p, pObj );
+        assert( pObj->pEquiv != NULL );
+//        pTemp = Ivy_Regular(pObj->pEquiv);
+//        assert( Ivy_Regular(pObj->pEquiv)->Type );
+    }
+    Extra_ProgressBarStop( p->pProgress );
+p->nClassesEnd = p->lClasses.nItems;
+    // try to prove the outputs of the miter
+    p->nNodesMiter = Ivy_ManNodeNum(p->pManFraig);
+//    Ivy_FraigMiterStatus( p->pManFraig );
+    if ( p->pParams->fProve && p->pManFraig->pData == NULL )
+        Ivy_FraigMiterProve( p );
+    // add the POs
+    Ivy_ManForEachPo( p->pManAig, pObj, i )
+        Ivy_ObjCreatePo( p->pManFraig, Ivy_ObjChild0Equiv(pObj) );
+    // clean the old manager
+    Ivy_ManForEachObj( p->pManAig, pObj, i )
+        pObj->pFanout = pObj->pNextFan0 = pObj->pNextFan1 = pObj->pPrevFan0 = pObj->pPrevFan1 = NULL;
+    // clean the new manager
+    Ivy_ManForEachObj( p->pManFraig, pObj, i )
+    {
+        if ( Ivy_ObjFaninVec(pObj) )
+            Vec_PtrFree( Ivy_ObjFaninVec(pObj) );
+        pObj->pNextFan0 = pObj->pNextFan1 = NULL;
+    }
+    // remove dangling nodes 
+    Ivy_ManCleanup( p->pManFraig );
+    // clean up the class marks
+    Ivy_FraigForEachEquivClass( p->lClasses.pHead, pObj )
+        pObj->fMarkA = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs fraiging for one node.]
+
+  Description [Returns the fraiged node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_FraigAnd( Ivy_FraigMan_t * p, Ivy_Obj_t * pObjOld )
+{ 
+    Ivy_Obj_t * pObjNew, * pFanin0New, * pFanin1New, * pObjReprNew;
+    int RetValue;
+    // get the fraiged fanins
+    pFanin0New = Ivy_ObjChild0Equiv(pObjOld);
+    pFanin1New = Ivy_ObjChild1Equiv(pObjOld);
+    // get the candidate fraig node
+    pObjNew = Ivy_And( p->pManFraig, pFanin0New, pFanin1New );
+    // get representative of this class
+    if ( Ivy_ObjClassNodeRepr(pObjOld) == NULL || // this is a unique node
+         (!p->pParams->fDoSparse && Ivy_ObjClassNodeRepr(pObjOld) == p->pManAig->pConst1) ) // this is a sparse node
+    {
+        assert( Ivy_Regular(pFanin0New) != Ivy_Regular(pFanin1New) );
+        assert( pObjNew != Ivy_Regular(pFanin0New) );
+        assert( pObjNew != Ivy_Regular(pFanin1New) );
+        return pObjNew;
+    }
+    // get the fraiged representative
+    pObjReprNew = Ivy_ObjFraig(Ivy_ObjClassNodeRepr(pObjOld));
+    // if the fraiged nodes are the same return
+    if ( Ivy_Regular(pObjNew) == Ivy_Regular(pObjReprNew) )
+        return pObjNew;
+    assert( Ivy_Regular(pObjNew) != Ivy_ManConst1(p->pManFraig) );
+//    printf( "Node = %d. Repr = %d.\n", pObjOld->Id, Ivy_ObjClassNodeRepr(pObjOld)->Id );
+
+    // they are different (the counter-example is in p->pPatWords)
+    RetValue = Ivy_FraigNodesAreEquiv( p, Ivy_Regular(pObjReprNew), Ivy_Regular(pObjNew) );
+    if ( RetValue == 1 )  // proved equivalent
+    {
+        // mark the class as proved
+        if ( Ivy_ObjClassNodeNext(pObjOld) == NULL )
+            Ivy_ObjClassNodeRepr(pObjOld)->fMarkA = 1;
+        return Ivy_NotCond( pObjReprNew, pObjOld->fPhase ^ Ivy_ObjClassNodeRepr(pObjOld)->fPhase );
+    }
+    if ( RetValue == -1 ) // failed
+        return pObjNew;
+    // simulate the counter-example and return the new node
+    Ivy_FraigResimulate( p );
+    return pObjNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints variable activity.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigPrintActivity( Ivy_FraigMan_t * p )
+{
+    int i;
+    for ( i = 0; i < p->nSatVars; i++ )
+        printf( "%d %.3f  ", i, p->pSat->activity[i] );
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Runs equivalence test for the two nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigNodesAreEquiv( Ivy_FraigMan_t * p, Ivy_Obj_t * pOld, Ivy_Obj_t * pNew )
+{
+    int pLits[4], RetValue, RetValue1, nBTLimit, clk, clk2 = clock();
+
+    // make sure the nodes are not complemented
+    assert( !Ivy_IsComplement(pNew) );
+    assert( !Ivy_IsComplement(pOld) );
+    assert( pNew != pOld );
+
+    // if at least one of the nodes is a failed node, perform adjustments:
+    // if the backtrack limit is small, simply skip this node
+    // if the backtrack limit is > 10, take the quare root of the limit
+    nBTLimit = p->pParams->nBTLimitNode;
+    if ( nBTLimit > 0 && (pOld->fFailTfo || pNew->fFailTfo) )
+    {
+        p->nSatFails++;
+        // fail immediately
+//        return -1;
+        if ( nBTLimit <= 10 )
+            return -1;
+        nBTLimit = (int)pow(nBTLimit, 0.7);
+    }
+    p->nSatCalls++;
+
+    // make sure the solver is allocated and has enough variables
+    if ( p->pSat == NULL )
+    {
+        p->pSat = sat_solver_new();
+        p->nSatVars = 1;
+        sat_solver_setnvars( p->pSat, 1000 );
+        // var 0 is reserved for const1 node - add the clause
+//        pLits[0] = toLit( 0 );
+//        sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+    }
+
+    // if the nodes do not have SAT variables, allocate them
+    Ivy_FraigNodeAddToSolver( p, pOld, pNew );
+
+    // prepare variable activity
+    Ivy_FraigSetActivityFactors( p, pOld, pNew ); 
+
+    // solve under assumptions
+    // A = 1; B = 0     OR     A = 1; B = 1 
+clk = clock();
+    pLits[0] = toLitCond( Ivy_ObjSatNum(pOld), 0 );
+    pLits[1] = toLitCond( Ivy_ObjSatNum(pNew), pOld->fPhase == pNew->fPhase );
+//Sat_SolverWriteDimacs( p->pSat, "temp.cnf", pLits, pLits + 2, 1 );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 2, 
+        (sint64)nBTLimit, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        pLits[1] = lit_neg( pLits[1] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+        // continue solving the other implication
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        Ivy_FraigSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        if ( pOld != p->pManFraig->pConst1 ) 
+            pOld->fFailTfo = 1;
+        pNew->fFailTfo = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+
+    // if the old node was constant 0, we already know the answer
+    if ( pOld == p->pManFraig->pConst1 )
+    {
+        p->nSatProof++;
+        return 1;
+    }
+
+    // solve under assumptions
+    // A = 0; B = 1     OR     A = 0; B = 0 
+clk = clock();
+    pLits[0] = toLitCond( Ivy_ObjSatNum(pOld), 1 );
+    pLits[1] = toLitCond( Ivy_ObjSatNum(pNew), pOld->fPhase ^ pNew->fPhase );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 2, 
+        (sint64)nBTLimit, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        pLits[1] = lit_neg( pLits[1] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        Ivy_FraigSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        pOld->fFailTfo = 1;
+        pNew->fFailTfo = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+/*
+    // check BDD proof
+    {
+        int RetVal;
+        PRT( "Sat", clock() - clk2 );
+        clk2 = clock();
+        RetVal = Ivy_FraigNodesAreEquivBdd( pOld, pNew );
+//        printf( "%d ", RetVal );
+        assert( RetVal );
+        PRT( "Bdd", clock() - clk2 );
+        printf( "\n" );
+    }
+*/
+    // return SAT proof
+    p->nSatProof++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Runs equivalence test for one node.]
+
+  Description [Returns the fraiged node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigNodeIsConst( Ivy_FraigMan_t * p, Ivy_Obj_t * pNew )
+{
+    int pLits[2], RetValue1, RetValue, clk;
+
+    // make sure the nodes are not complemented
+    assert( !Ivy_IsComplement(pNew) );
+    assert( pNew != p->pManFraig->pConst1 );
+    p->nSatCalls++;
+
+    // make sure the solver is allocated and has enough variables
+    if ( p->pSat == NULL )
+    {
+        p->pSat = sat_solver_new();
+        p->nSatVars = 1;
+        sat_solver_setnvars( p->pSat, 1000 );
+        // var 0 is reserved for const1 node - add the clause
+//        pLits[0] = toLit( 0 );
+//        sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+    }
+
+    // if the nodes do not have SAT variables, allocate them
+    Ivy_FraigNodeAddToSolver( p, NULL, pNew );
+
+    // prepare variable activity
+    Ivy_FraigSetActivityFactors( p, NULL, pNew ); 
+
+    // solve under assumptions
+clk = clock();
+    pLits[0] = toLitCond( Ivy_ObjSatNum(pNew), pNew->fPhase );
+    RetValue1 = sat_solver_solve( p->pSat, pLits, pLits + 1, 
+        (sint64)p->pParams->nBTLimitMiter, (sint64)0, 
+        p->nBTLimitGlobal, p->nInsLimitGlobal );
+p->timeSat += clock() - clk;
+    if ( RetValue1 == l_False )
+    {
+p->timeSatUnsat += clock() - clk;
+        pLits[0] = lit_neg( pLits[0] );
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 1 );
+        assert( RetValue );
+        // continue solving the other implication
+        p->nSatCallsUnsat++;
+    }
+    else if ( RetValue1 == l_True )
+    {
+p->timeSatSat += clock() - clk;
+        if ( p->pPatWords )
+            Ivy_FraigSavePattern( p );
+        p->nSatCallsSat++;
+        return 0;
+    }
+    else // if ( RetValue1 == l_Undef )
+    {
+p->timeSatFail += clock() - clk;
+        // mark the node as the failed node
+        pNew->fFailTfo = 1;
+        p->nSatFailsReal++;
+        return -1;
+    }
+
+    // return SAT proof
+    p->nSatProof++;
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Addes clauses to the solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAddClausesMux( Ivy_FraigMan_t * p, Ivy_Obj_t * pNode )
+{
+    Ivy_Obj_t * pNodeI, * pNodeT, * pNodeE;
+    int pLits[4], RetValue, VarF, VarI, VarT, VarE, fCompT, fCompE;
+
+    assert( !Ivy_IsComplement( pNode ) );
+    assert( Ivy_ObjIsMuxType( pNode ) );
+    // get nodes (I = if, T = then, E = else)
+    pNodeI = Ivy_ObjRecognizeMux( pNode, &pNodeT, &pNodeE );
+    // get the variable numbers
+    VarF = Ivy_ObjSatNum(pNode);
+    VarI = Ivy_ObjSatNum(pNodeI);
+    VarT = Ivy_ObjSatNum(Ivy_Regular(pNodeT));
+    VarE = Ivy_ObjSatNum(Ivy_Regular(pNodeE));
+    // get the complementation flags
+    fCompT = Ivy_IsComplement(pNodeT);
+    fCompE = Ivy_IsComplement(pNodeE);
+
+    // f = ITE(i, t, e)
+
+    // i' + t' + f
+    // i' + t  + f'
+    // i  + e' + f
+    // i  + e  + f'
+
+    // create four clauses
+    pLits[0] = toLitCond(VarI, 1);
+    pLits[1] = toLitCond(VarT, 1^fCompT);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 1);
+    pLits[1] = toLitCond(VarT, 0^fCompT);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 0);
+    pLits[1] = toLitCond(VarE, 1^fCompE);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarI, 0);
+    pLits[1] = toLitCond(VarE, 0^fCompE);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+
+    // two additional clauses
+    // t' & e' -> f'
+    // t  & e  -> f 
+
+    // t  + e   + f'
+    // t' + e'  + f 
+
+    if ( VarT == VarE )
+    {
+//        assert( fCompT == !fCompE );
+        return;
+    }
+
+    pLits[0] = toLitCond(VarT, 0^fCompT);
+    pLits[1] = toLitCond(VarE, 0^fCompE);
+    pLits[2] = toLitCond(VarF, 1);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+    pLits[0] = toLitCond(VarT, 1^fCompT);
+    pLits[1] = toLitCond(VarE, 1^fCompE);
+    pLits[2] = toLitCond(VarF, 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 3 );
+    assert( RetValue );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Addes clauses to the solver.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigAddClausesSuper( Ivy_FraigMan_t * p, Ivy_Obj_t * pNode, Vec_Ptr_t * vSuper )
+{
+    Ivy_Obj_t * pFanin;
+    int * pLits, nLits, RetValue, i;
+    assert( !Ivy_IsComplement(pNode) );
+    assert( Ivy_ObjIsNode( pNode ) );
+    // create storage for literals
+    nLits = Vec_PtrSize(vSuper) + 1;
+    pLits = ALLOC( int, nLits );
+    // suppose AND-gate is A & B = C
+    // add !A => !C   or   A + !C
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+    {
+        pLits[0] = toLitCond(Ivy_ObjSatNum(Ivy_Regular(pFanin)), Ivy_IsComplement(pFanin));
+        pLits[1] = toLitCond(Ivy_ObjSatNum(pNode), 1);
+        RetValue = sat_solver_addclause( p->pSat, pLits, pLits + 2 );
+        assert( RetValue );
+    }
+    // add A & B => C   or   !A + !B + C
+    Vec_PtrForEachEntry( vSuper, pFanin, i )
+        pLits[i] = toLitCond(Ivy_ObjSatNum(Ivy_Regular(pFanin)), !Ivy_IsComplement(pFanin));
+    pLits[nLits-1] = toLitCond(Ivy_ObjSatNum(pNode), 0);
+    RetValue = sat_solver_addclause( p->pSat, pLits, pLits + nLits );
+    assert( RetValue );
+    free( pLits );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigCollectSuper_rec( Ivy_Obj_t * pObj, Vec_Ptr_t * vSuper, int fFirst, int fUseMuxes )
+{
+    // if the new node is complemented or a PI, another gate begins
+    if ( Ivy_IsComplement(pObj) || Ivy_ObjIsPi(pObj) || (!fFirst && Ivy_ObjRefs(pObj) > 1) || 
+         (fUseMuxes && Ivy_ObjIsMuxType(pObj)) )
+    {
+        Vec_PtrPushUnique( vSuper, pObj );
+        return;
+    }
+    // go through the branches
+    Ivy_FraigCollectSuper_rec( Ivy_ObjChild0(pObj), vSuper, 0, fUseMuxes );
+    Ivy_FraigCollectSuper_rec( Ivy_ObjChild1(pObj), vSuper, 0, fUseMuxes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collects the supergate.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Ivy_FraigCollectSuper( Ivy_Obj_t * pObj, int fUseMuxes )
+{
+    Vec_Ptr_t * vSuper;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_ObjIsPi(pObj) );
+    vSuper = Vec_PtrAlloc( 4 );
+    Ivy_FraigCollectSuper_rec( pObj, vSuper, 1, fUseMuxes );
+    return vSuper;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the solver clause database.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigObjAddToFrontier( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj, Vec_Ptr_t * vFrontier )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    if ( Ivy_ObjSatNum(pObj) )
+        return;
+    assert( Ivy_ObjSatNum(pObj) == 0 );
+    assert( Ivy_ObjFaninVec(pObj) == NULL );
+    if ( Ivy_ObjIsConst1(pObj) )
+        return;
+//printf( "Assigning node %d number %d\n", pObj->Id, p->nSatVars );
+    Ivy_ObjSetSatNum( pObj, p->nSatVars++ );
+    if ( Ivy_ObjIsNode(pObj) )
+        Vec_PtrPush( vFrontier, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the solver clause database.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_FraigNodeAddToSolver( Ivy_FraigMan_t * p, Ivy_Obj_t * pOld, Ivy_Obj_t * pNew )
+{ 
+    Vec_Ptr_t * vFrontier, * vFanins;
+    Ivy_Obj_t * pNode, * pFanin;
+    int i, k, fUseMuxes = 1;
+    assert( pOld || pNew );
+    // quit if CNF is ready
+    if ( (!pOld || Ivy_ObjFaninVec(pOld)) && (!pNew || Ivy_ObjFaninVec(pNew)) )
+        return;
+    // start the frontier
+    vFrontier = Vec_PtrAlloc( 100 );
+    if ( pOld ) Ivy_FraigObjAddToFrontier( p, pOld, vFrontier );
+    if ( pNew ) Ivy_FraigObjAddToFrontier( p, pNew, vFrontier );
+    // explore nodes in the frontier
+    Vec_PtrForEachEntry( vFrontier, pNode, i )
+    {
+        // create the supergate
+        assert( Ivy_ObjSatNum(pNode) );
+        assert( Ivy_ObjFaninVec(pNode) == NULL );
+        if ( fUseMuxes && Ivy_ObjIsMuxType(pNode) )
+        {
+            vFanins = Vec_PtrAlloc( 4 );
+            Vec_PtrPushUnique( vFanins, Ivy_ObjFanin0( Ivy_ObjFanin0(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Ivy_ObjFanin0( Ivy_ObjFanin1(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Ivy_ObjFanin1( Ivy_ObjFanin0(pNode) ) );
+            Vec_PtrPushUnique( vFanins, Ivy_ObjFanin1( Ivy_ObjFanin1(pNode) ) );
+            Vec_PtrForEachEntry( vFanins, pFanin, k )
+                Ivy_FraigObjAddToFrontier( p, Ivy_Regular(pFanin), vFrontier );
+            Ivy_FraigAddClausesMux( p, pNode );
+        }
+        else
+        {
+            vFanins = Ivy_FraigCollectSuper( pNode, fUseMuxes );
+            Vec_PtrForEachEntry( vFanins, pFanin, k )
+                Ivy_FraigObjAddToFrontier( p, Ivy_Regular(pFanin), vFrontier );
+            Ivy_FraigAddClausesSuper( p, pNode, vFanins );
+        }
+        assert( Vec_PtrSize(vFanins) > 1 );
+        Ivy_ObjSetFaninVec( pNode, vFanins );
+    }
+    Vec_PtrFree( vFrontier );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets variable activities in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigSetActivityFactors_rec( Ivy_FraigMan_t * p, Ivy_Obj_t * pObj, int LevelMin, int LevelMax )
+{
+    Vec_Ptr_t * vFanins;
+    Ivy_Obj_t * pFanin;
+    int i, Counter = 0;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjSatNum(pObj) );
+    // skip visited variables
+    if ( Ivy_ObjIsTravIdCurrent(p->pManFraig, pObj) )
+        return 0;
+    Ivy_ObjSetTravIdCurrent(p->pManFraig, pObj);
+    // add the PI to the list
+    if ( pObj->Level <= (unsigned)LevelMin || Ivy_ObjIsPi(pObj) )
+        return 0;
+    // set the factor of this variable
+    // (LevelMax-LevelMin) / (pObj->Level-LevelMin) = p->pParams->dActConeBumpMax / ThisBump
+    p->pSat->factors[Ivy_ObjSatNum(pObj)] = p->pParams->dActConeBumpMax * (pObj->Level - LevelMin)/(LevelMax - LevelMin);
+    veci_push(&p->pSat->act_vars, Ivy_ObjSatNum(pObj));
+    // explore the fanins
+    vFanins = Ivy_ObjFaninVec( pObj );
+    Vec_PtrForEachEntry( vFanins, pFanin, i )
+        Counter += Ivy_FraigSetActivityFactors_rec( p, Ivy_Regular(pFanin), LevelMin, LevelMax );
+    return 1 + Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets variable activities in the cone.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigSetActivityFactors( Ivy_FraigMan_t * p, Ivy_Obj_t * pOld, Ivy_Obj_t * pNew )
+{
+    int clk, LevelMin, LevelMax;
+    assert( pOld || pNew );
+clk = clock(); 
+    // reset the active variables
+    veci_resize(&p->pSat->act_vars, 0);
+    // prepare for traversal
+    Ivy_ManIncrementTravId( p->pManFraig );
+    // determine the min and max level to visit
+    assert( p->pParams->dActConeRatio > 0 && p->pParams->dActConeRatio < 1 );
+    LevelMax = IVY_MAX( (pNew ? pNew->Level : 0), (pOld ? pOld->Level : 0) );
+    LevelMin = (int)(LevelMax * (1.0 - p->pParams->dActConeRatio));
+    // traverse
+    if ( pOld && !Ivy_ObjIsConst1(pOld) )
+        Ivy_FraigSetActivityFactors_rec( p, pOld, LevelMin, LevelMax );
+    if ( pNew && !Ivy_ObjIsConst1(pNew) )
+        Ivy_FraigSetActivityFactors_rec( p, pNew, LevelMin, LevelMax );
+//Ivy_FraigPrintActivity( p );
+p->timeTrav += clock() - clk;
+    return 1;
+}
+
+
+
+#include "cuddInt.h"
+
+/**Function*************************************************************
+
+  Synopsis    [Checks equivalence using BDDs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+DdNode * Ivy_FraigNodesAreEquivBdd_int( DdManager * dd, DdNode * bFunc, Vec_Ptr_t * vFront, int Level )
+{
+    DdNode ** pFuncs;
+    DdNode * bFuncNew;
+    Vec_Ptr_t * vTemp;
+    Ivy_Obj_t * pObj, * pFanin;
+    int i, NewSize;
+    // create new frontier
+    vTemp = Vec_PtrAlloc( 100 );
+    Vec_PtrForEachEntry( vFront, pObj, i )
+    {
+        if ( (int)pObj->Level != Level )
+        {
+            pObj->fMarkB = 1;
+            pObj->TravId = Vec_PtrSize(vTemp);
+            Vec_PtrPush( vTemp, pObj );
+            continue;
+        }
+
+        pFanin = Ivy_ObjFanin0(pObj);
+        if ( pFanin->fMarkB == 0 )
+        {
+            pFanin->fMarkB = 1;
+            pFanin->TravId = Vec_PtrSize(vTemp);
+            Vec_PtrPush( vTemp, pFanin );
+        }
+
+        pFanin = Ivy_ObjFanin1(pObj);
+        if ( pFanin->fMarkB == 0 )
+        {
+            pFanin->fMarkB = 1;
+            pFanin->TravId = Vec_PtrSize(vTemp);
+            Vec_PtrPush( vTemp, pFanin );
+        }
+    }
+    // collect the permutation
+    NewSize = IVY_MAX(dd->size, Vec_PtrSize(vTemp));
+    pFuncs = ALLOC( DdNode *, NewSize );
+    Vec_PtrForEachEntry( vFront, pObj, i )
+    {
+        if ( (int)pObj->Level != Level )
+            pFuncs[i] = Cudd_bddIthVar( dd, pObj->TravId );
+        else
+            pFuncs[i] = Cudd_bddAnd( dd, 
+                Cudd_NotCond( Cudd_bddIthVar(dd, Ivy_ObjFanin0(pObj)->TravId), Ivy_ObjFaninC0(pObj) ),
+                Cudd_NotCond( Cudd_bddIthVar(dd, Ivy_ObjFanin1(pObj)->TravId), Ivy_ObjFaninC1(pObj) ) );
+        Cudd_Ref( pFuncs[i] );
+    }
+    // add the remaining vars
+    assert( NewSize == dd->size );
+    for ( i = Vec_PtrSize(vFront); i < dd->size; i++ )
+    {
+        pFuncs[i] = Cudd_bddIthVar( dd, i );
+        Cudd_Ref( pFuncs[i] );
+    }
+
+    // create new
+    bFuncNew = Cudd_bddVectorCompose( dd, bFunc, pFuncs ); Cudd_Ref( bFuncNew );
+    // clean trav Id
+    Vec_PtrForEachEntry( vTemp, pObj, i )
+    {
+        pObj->fMarkB = 0;
+        pObj->TravId = 0;
+    }
+    // deref
+    for ( i = 0; i < dd->size; i++ )
+        Cudd_RecursiveDeref( dd, pFuncs[i] );
+    free( pFuncs );
+
+    free( vFront->pArray );
+    *vFront = *vTemp;
+
+    vTemp->nCap = vTemp->nSize = 0;
+    vTemp->pArray = NULL;
+    Vec_PtrFree( vTemp );
+
+    Cudd_Deref( bFuncNew );
+    return bFuncNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks equivalence using BDDs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_FraigNodesAreEquivBdd( Ivy_Obj_t * pObj1, Ivy_Obj_t * pObj2 )
+{
+    static DdManager * dd = NULL;
+    DdNode * bFunc, * bTemp;
+    Vec_Ptr_t * vFront;
+    Ivy_Obj_t * pObj;
+    int i, RetValue, Iter, Level;
+    // start the manager
+    if ( dd == NULL )
+        dd = Cudd_Init( 50, 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
+    // create front
+    vFront = Vec_PtrAlloc( 100 );
+    Vec_PtrPush( vFront, pObj1 );
+    Vec_PtrPush( vFront, pObj2 );
+    // get the function
+    bFunc = Cudd_bddXor( dd, Cudd_bddIthVar(dd,0), Cudd_bddIthVar(dd,1) );  Cudd_Ref( bFunc );
+    bFunc = Cudd_NotCond( bFunc, pObj1->fPhase != pObj2->fPhase );
+    // try running BDDs
+    for ( Iter = 0; ; Iter++ )
+    {
+        // find max level
+        Level = 0;
+        Vec_PtrForEachEntry( vFront, pObj, i )
+            if ( Level < (int)pObj->Level )
+                Level = (int)pObj->Level;
+        if ( Level == 0 )
+            break;            
+        bFunc = Ivy_FraigNodesAreEquivBdd_int( dd, bTemp = bFunc, vFront, Level ); Cudd_Ref( bFunc );
+        Cudd_RecursiveDeref( dd, bTemp );
+        if ( bFunc == Cudd_ReadLogicZero(dd) ) // proved
+            {printf( "%d", Iter ); break;}
+        if ( Cudd_DagSize(bFunc) > 1000 )
+            {printf( "b" ); break;}
+        if ( dd->size > 120 )
+            {printf( "s" ); break;}
+        if ( Iter > 50 )
+            {printf( "i" ); break;}
+    }
+    if ( bFunc == Cudd_ReadLogicZero(dd) ) // unsat
+        RetValue = 1;
+    else if ( Level == 0 ) // sat
+        RetValue = 0;
+    else 
+        RetValue = -1; // spaceout/timeout
+    Cudd_RecursiveDeref( dd, bFunc );
+    Vec_PtrFree( vFront );
+    return RetValue;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyHaig.c b/abc70930/src/aig/ivy/ivyHaig.c
new file mode 100644
index 00000000..87021600
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyHaig.c
@@ -0,0 +1,530 @@
+/**CFile****************************************************************
+
+  FileName    [ivyHaig.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [HAIG management procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyHaig.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+/* 
+    HAIGing rules in working AIG:
+    - Each node in the working AIG has a pointer to the corresponding node in HAIG 
+      (this node is not necessarily the representative of the equivalence class of HAIG nodes)
+    - This pointer is complemented if the AIG node and its corresponding HAIG node have different phase
+
+    Choice node rules in HAIG:
+    - Equivalent nodes are linked into a ring
+    - Exactly one node in the ring has fanouts (this node is called the representative)
+    - The pointer going from a node to the next node in the ring is complemented 
+      if the first node is complemented, compared to the representative node of the equivalence class
+    - (consequence of the above) The representative node always has non-complemented pointer to the next node
+    - New nodes are inserted into the ring immediately after the representative node
+*/
+
+// returns the representative node of the given HAIG node
+static inline Ivy_Obj_t * Ivy_HaigObjRepr( Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pTemp;
+    assert( !Ivy_IsComplement(pObj) );
+    // if the node has no equivalent node or has fanout, it is representative
+    if ( pObj->pEquiv == NULL || Ivy_ObjRefs(pObj) > 0 )
+        return pObj;
+    // the node belongs to a class and is not a representative
+    // complemented edge (pObj->pEquiv) tells if it is complemented w.r.t. the repr
+    for ( pTemp = Ivy_Regular(pObj->pEquiv); pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+        if ( Ivy_ObjRefs(pTemp) > 0 )
+            break;
+    // return the representative node
+    assert( Ivy_ObjRefs(pTemp) > 0 );
+    return Ivy_NotCond( pTemp, Ivy_IsComplement(pObj->pEquiv) );
+}
+
+// counts the number of nodes in the equivalence class
+static inline int Ivy_HaigObjCountClass( Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pTemp;
+    int Counter;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjRefs(pObj) > 0 );
+    if ( pObj->pEquiv == NULL )
+        return 1;
+    assert( !Ivy_IsComplement(pObj->pEquiv) );
+    Counter = 1;
+    for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+        Counter++;
+    return Counter;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts HAIG for the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigStart( Ivy_Man_t * p, int fVerbose )
+{
+    Vec_Int_t * vLatches;
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( p->pHaig == NULL );
+    p->pHaig = Ivy_ManDup( p );
+
+    if ( fVerbose )
+    {
+        printf( "Starting : " );
+        Ivy_ManPrintStats( p->pHaig );
+    }
+
+    // collect latches of design D and set their values to be DC
+    vLatches = Vec_IntAlloc( 100 );
+    Ivy_ManForEachLatch( p->pHaig, pObj, i )
+    {
+        pObj->Init = IVY_INIT_DC;
+        Vec_IntPush( vLatches, pObj->Id );
+    }
+    p->pHaig->pData = vLatches;
+/*
+    {
+        int x;
+        Ivy_ManShow( p, 0, NULL );
+        Ivy_ManShow( p->pHaig, 1, NULL );
+        x = 0;
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transfers the HAIG to the newly created manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigTrasfer( Ivy_Man_t * p, Ivy_Man_t * pNew )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( p->pHaig != NULL );
+    Ivy_ManConst1(pNew)->pEquiv = Ivy_ManConst1(p)->pEquiv;
+    Ivy_ManForEachPi( pNew, pObj, i )
+        pObj->pEquiv = Ivy_ManPi( p, i )->pEquiv;
+    pNew->pHaig = p->pHaig;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops HAIG for the manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigStop( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    assert( p->pHaig != NULL );
+    Vec_IntFree( p->pHaig->pData );
+    Ivy_ManStop( p->pHaig );
+    p->pHaig = NULL;
+    // remove dangling pointers to the HAIG objects
+    Ivy_ManForEachObj( p, pObj, i )
+        pObj->pEquiv = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates a new node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigCreateObj( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pEquiv0, * pEquiv1;
+    assert( p->pHaig != NULL );
+    assert( !Ivy_IsComplement(pObj) );
+    if ( Ivy_ObjType(pObj) == IVY_BUF )
+        pObj->pEquiv = Ivy_ObjChild0Equiv(pObj);
+    else if ( Ivy_ObjType(pObj) == IVY_LATCH )
+    {
+//        pObj->pEquiv = Ivy_Latch( p->pHaig, Ivy_ObjChild0Equiv(pObj), pObj->Init );
+        pEquiv0 = Ivy_ObjChild0Equiv(pObj);
+        pEquiv0 = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pEquiv0)), Ivy_IsComplement(pEquiv0) );
+        pObj->pEquiv = Ivy_Latch( p->pHaig, pEquiv0, pObj->Init );
+    }
+    else if ( Ivy_ObjType(pObj) == IVY_AND )
+    {
+//        pObj->pEquiv = Ivy_And( p->pHaig, Ivy_ObjChild0Equiv(pObj), Ivy_ObjChild1Equiv(pObj) );
+        pEquiv0 = Ivy_ObjChild0Equiv(pObj);
+        pEquiv0 = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pEquiv0)), Ivy_IsComplement(pEquiv0) );
+        pEquiv1 = Ivy_ObjChild1Equiv(pObj);
+        pEquiv1 = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pEquiv1)), Ivy_IsComplement(pEquiv1) );
+        pObj->pEquiv = Ivy_And( p->pHaig, pEquiv0, pEquiv1 );
+    }
+    else assert( 0 );
+    // make sure the node points to the representative
+//    pObj->pEquiv = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pObj->pEquiv)), Ivy_IsComplement(pObj->pEquiv) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if the old node is in the TFI of the new node.]
+
+  Description [] 
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjIsInTfi_rec( Ivy_Obj_t * pObjNew, Ivy_Obj_t * pObjOld, int Levels )
+{
+    if ( pObjNew == pObjOld )
+        return 1;
+    if ( Levels == 0 || Ivy_ObjIsCi(pObjNew) || Ivy_ObjIsConst1(pObjNew) )
+        return 0;
+    if ( Ivy_ObjIsInTfi_rec( Ivy_ObjFanin0(pObjNew), pObjOld, Levels - 1 ) )
+        return 1;
+    if ( Ivy_ObjIsNode(pObjNew) && Ivy_ObjIsInTfi_rec( Ivy_ObjFanin1(pObjNew), pObjOld, Levels - 1 ) )
+        return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the pair of equivalent nodes in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigCreateChoice( Ivy_Man_t * p, Ivy_Obj_t * pObjOld, Ivy_Obj_t * pObjNew )
+{
+    Ivy_Obj_t * pObjOldHaig, * pObjNewHaig;
+    Ivy_Obj_t * pObjOldHaigR, * pObjNewHaigR;
+    int fCompl;
+//printf( "\nCreating choice for %d and %d in AIG\n", pObjOld->Id, Ivy_Regular(pObjNew)->Id );
+
+    assert( p->pHaig != NULL );
+    assert( !Ivy_IsComplement(pObjOld) );
+    // get pointers to the representatives of pObjOld and pObjNew
+    pObjOldHaig = pObjOld->pEquiv;
+    pObjNewHaig = Ivy_NotCond( Ivy_Regular(pObjNew)->pEquiv, Ivy_IsComplement(pObjNew) );
+    // get the classes
+    pObjOldHaig = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pObjOldHaig)), Ivy_IsComplement(pObjOldHaig) );
+    pObjNewHaig = Ivy_NotCond( Ivy_HaigObjRepr(Ivy_Regular(pObjNewHaig)), Ivy_IsComplement(pObjNewHaig) );
+    // get regular pointers
+    pObjOldHaigR = Ivy_Regular(pObjOldHaig);
+    pObjNewHaigR = Ivy_Regular(pObjNewHaig);
+    // check if there is phase difference between them
+    fCompl = (Ivy_IsComplement(pObjOldHaig) != Ivy_IsComplement(pObjNewHaig));
+    // if the class is the same, nothing to do
+    if ( pObjOldHaigR == pObjNewHaigR )
+        return;
+    // if the second node belongs to a class, do not merge classes (for the time being)
+    if ( Ivy_ObjRefs(pObjOldHaigR) == 0 || pObjNewHaigR->pEquiv != NULL || 
+        Ivy_ObjRefs(pObjNewHaigR) > 0 ) //|| Ivy_ObjIsInTfi_rec(pObjNewHaigR, pObjOldHaigR, 10) )
+    {
+/*
+        if ( pObjNewHaigR->pEquiv != NULL )
+            printf( "c" );
+        if ( Ivy_ObjRefs(pObjNewHaigR) > 0 )
+            printf( "f" );
+        printf( " " );
+*/
+        p->pHaig->nClassesSkip++;
+        return;
+    }
+
+    // add this node to the class of pObjOldHaig
+    assert( Ivy_ObjRefs(pObjOldHaigR) > 0 );
+    assert( !Ivy_IsComplement(pObjOldHaigR->pEquiv) );
+    if ( pObjOldHaigR->pEquiv == NULL )
+        pObjNewHaigR->pEquiv = Ivy_NotCond( pObjOldHaigR, fCompl );
+    else
+        pObjNewHaigR->pEquiv = Ivy_NotCond( pObjOldHaigR->pEquiv, fCompl );
+    pObjOldHaigR->pEquiv = pObjNewHaigR;
+//printf( "Setting choice node %d -> %d.\n", pObjOldHaigR->Id, pObjNewHaigR->Id );
+    // update the class of the new node
+//    Ivy_Regular(pObjNew)->pEquiv = Ivy_NotCond( pObjOldHaigR, fCompl ^ Ivy_IsComplement(pObjNew) );
+//printf( "Creating choice for %d and %d in HAIG\n", pObjOldHaigR->Id, pObjNewHaigR->Id );
+
+//    if ( pObjOldHaigR->Id == 13 )
+//    {
+//        Ivy_ManShow( p, 0 );
+//        Ivy_ManShow( p->pHaig, 1 );
+//    }
+//    if ( !Ivy_ManIsAcyclic( p->pHaig ) )
+//        printf( "HAIG contains a cycle\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of choices and choice nodes in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManHaigCountChoices( Ivy_Man_t * p, int * pnChoices )
+{
+    Ivy_Obj_t * pObj;
+    int nChoices, nChoiceNodes, Counter, i;
+    assert( p->pHaig != NULL );
+    nChoices = nChoiceNodes = 0;
+    Ivy_ManForEachObj( p->pHaig, pObj, i )
+    {
+        if ( Ivy_ObjIsTerm(pObj) || i == 0 )
+            continue;
+        if ( Ivy_ObjRefs(pObj) == 0 )
+            continue;
+        Counter = Ivy_HaigObjCountClass( pObj );
+        nChoiceNodes += (int)(Counter > 1);
+        nChoices += Counter - 1;
+//        if ( Counter > 1 )
+//            printf( "Choice node %d %s\n", pObj->Id, Ivy_ObjIsLatch(pObj)? "(latch)": "" );
+    }
+    *pnChoices = nChoices;
+    return nChoiceNodes;
+} 
+
+/**Function*************************************************************
+
+  Synopsis    [Prints statistics of the HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigPostprocess( Ivy_Man_t * p, int fVerbose )
+{
+    int nChoices, nChoiceNodes;
+
+    assert( p->pHaig != NULL );
+
+    if ( fVerbose )
+    {
+        printf( "Final    : " );
+        Ivy_ManPrintStats( p );
+        printf( "HAIG     : " );
+        Ivy_ManPrintStats( p->pHaig );
+
+        // print choice node stats
+        nChoiceNodes = Ivy_ManHaigCountChoices( p, &nChoices );
+        printf( "Total choice nodes = %d. Total choices = %d. Skipped classes = %d.\n", 
+            nChoiceNodes, nChoices, p->pHaig->nClassesSkip ); 
+    }
+
+    if ( Ivy_ManIsAcyclic( p->pHaig ) )
+    {
+        if ( fVerbose )
+            printf( "HAIG is acyclic\n" );
+    }
+    else
+        printf( "HAIG contains a cycle\n" );
+
+//    if ( fVerbose )
+//        Ivy_ManHaigSimulate( p );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Applies the simulation rules.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Ivy_Init_t Ivy_ManHaigSimulateAnd( Ivy_Init_t In0, Ivy_Init_t In1 )
+{
+    assert( In0 != IVY_INIT_NONE && In1 != IVY_INIT_NONE );
+    if ( In0 == IVY_INIT_DC || In1 == IVY_INIT_DC )
+        return IVY_INIT_DC;
+    if ( In0 == IVY_INIT_1 && In1 == IVY_INIT_1 )
+        return IVY_INIT_1;
+    return IVY_INIT_0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Applies the simulation rules.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline Ivy_Init_t Ivy_ManHaigSimulateChoice( Ivy_Init_t In0, Ivy_Init_t In1 )
+{
+    assert( In0 != IVY_INIT_NONE && In1 != IVY_INIT_NONE );
+    if ( (In0 == IVY_INIT_0 && In1 == IVY_INIT_1) || (In0 == IVY_INIT_1 && In1 == IVY_INIT_0) )
+    {
+         printf( "Compatibility fails.\n" );
+         return IVY_INIT_0;
+    }
+    if ( In0 == IVY_INIT_DC && In1 == IVY_INIT_DC )
+        return IVY_INIT_DC;
+    if ( In0 != IVY_INIT_DC )
+        return In0;
+    return In1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Simulate HAIG using modified 3-valued simulation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManHaigSimulate( Ivy_Man_t * p )
+{
+    Vec_Int_t * vNodes, * vLatches, * vLatchesD;
+    Ivy_Obj_t * pObj, * pTemp;
+    Ivy_Init_t In0, In1;
+    int i, k, Counter;
+    int fVerbose = 0;
+
+    // check choices
+    Ivy_ManCheckChoices( p );
+
+    // switch to HAIG
+    assert( p->pHaig != NULL );
+    p = p->pHaig;
+
+if ( fVerbose )
+Ivy_ManForEachPi( p, pObj, i )
+printf( "Setting PI %d\n", pObj->Id );
+
+    // collect latches and nodes in the DFS order
+    vNodes = Ivy_ManDfsSeq( p, &vLatches );
+
+if ( fVerbose )
+Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+printf( "Collected node %d with fanins %d and %d\n", pObj->Id, Ivy_ObjFanin0(pObj)->Id, Ivy_ObjFanin1(pObj)->Id );
+
+    // set the PI values
+    Ivy_ManConst1(p)->Init = IVY_INIT_1;
+    Ivy_ManForEachPi( p, pObj, i )
+        pObj->Init = IVY_INIT_0;
+
+    // set the latch values
+    Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+        pObj->Init = IVY_INIT_DC;
+    // set the latches of D to be determinate
+    vLatchesD = p->pData;
+    Ivy_ManForEachNodeVec( p, vLatchesD, pObj, i )
+        pObj->Init = IVY_INIT_0;
+
+    // perform several rounds of simulation
+    for ( k = 0; k < 10; k++ )
+    {
+        // count the number of non-determinate values
+        Counter = 0;
+        Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+            Counter += ( pObj->Init == IVY_INIT_DC );
+        printf( "Iter %d : Non-determinate = %d\n", k, Counter );    
+        
+        // simulate the internal nodes
+        Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+        {
+if ( fVerbose )
+printf( "Processing node %d with fanins %d and %d\n", pObj->Id, Ivy_ObjFanin0(pObj)->Id, Ivy_ObjFanin1(pObj)->Id );
+            In0 = Ivy_InitNotCond( Ivy_ObjFanin0(pObj)->Init, Ivy_ObjFaninC0(pObj) );
+            In1 = Ivy_InitNotCond( Ivy_ObjFanin1(pObj)->Init, Ivy_ObjFaninC1(pObj) );
+            pObj->Init = Ivy_ManHaigSimulateAnd( In0, In1 );
+            // simulate the equivalence class if the node is a representative
+            if ( pObj->pEquiv && Ivy_ObjRefs(pObj) > 0 )
+            {
+if ( fVerbose )
+printf( "Processing choice node %d\n", pObj->Id );
+                In0 = pObj->Init;
+                assert( !Ivy_IsComplement(pObj->pEquiv) );
+                for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+                {
+if ( fVerbose )
+printf( "Processing secondary node %d\n", pTemp->Id );
+                    In1 = Ivy_InitNotCond( pTemp->Init, Ivy_IsComplement(pTemp->pEquiv) );
+                    In0 = Ivy_ManHaigSimulateChoice( In0, In1 );
+                }
+                pObj->Init = In0;
+            }
+        }
+
+        // simulate the latches
+        Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+        {
+            pObj->Level = Ivy_ObjFanin0(pObj)->Init;
+if ( fVerbose )
+printf( "Using latch %d with fanin %d\n", pObj->Id, Ivy_ObjFanin0(pObj)->Id );
+        }
+        Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+            pObj->Init = pObj->Level, pObj->Level = 0;
+    }
+    // free arrays
+    Vec_IntFree( vNodes );
+    Vec_IntFree( vLatches );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyMan.c b/abc70930/src/aig/ivy/ivyMan.c
new file mode 100644
index 00000000..07faef85
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyMan.c
@@ -0,0 +1,546 @@
+/**CFile****************************************************************
+
+  FileName    [ivyMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [AIG manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivy_.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManStart()
+{
+    Ivy_Man_t * p;
+    // start the manager
+    p = ALLOC( Ivy_Man_t, 1 );
+    memset( p, 0, sizeof(Ivy_Man_t) );
+    // perform initializations
+    p->Ghost.Id   = -1;
+    p->nTravIds   =  1;
+    p->fCatchExor =  1;
+    // allocate arrays for nodes
+    p->vPis = Vec_PtrAlloc( 100 );
+    p->vPos = Vec_PtrAlloc( 100 );
+    p->vBufs = Vec_PtrAlloc( 100 );
+    p->vObjs = Vec_PtrAlloc( 100 );
+    // prepare the internal memory manager
+    Ivy_ManStartMemory( p );
+    // create the constant node
+    p->pConst1 = Ivy_ManFetchMemory( p );
+    p->pConst1->fPhase = 1;
+    Vec_PtrPush( p->vObjs, p->pConst1 );
+    p->nCreated = 1;
+    // start the table
+    p->nTableSize = 10007;
+    p->pTable = ALLOC( int, p->nTableSize );
+    memset( p->pTable, 0, sizeof(int) * p->nTableSize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManStartFrom( Ivy_Man_t * p )
+{
+    Ivy_Man_t * pNew;
+    Ivy_Obj_t * pObj;
+    int i;
+    // create the new manager
+    pNew = Ivy_ManStart();
+    // create the PIs
+    Ivy_ManConst1(p)->pEquiv = Ivy_ManConst1(pNew);
+    Ivy_ManForEachPi( p, pObj, i )
+        pObj->pEquiv = Ivy_ObjCreatePi(pNew);
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManDup( Ivy_Man_t * p )
+{
+    Vec_Int_t * vNodes, * vLatches;
+    Ivy_Man_t * pNew;
+    Ivy_Obj_t * pObj;
+    int i;
+    // collect latches and nodes in the DFS order
+    vNodes = Ivy_ManDfsSeq( p, &vLatches );
+    // create the new manager
+    pNew = Ivy_ManStart();
+    // create the PIs
+    Ivy_ManConst1(p)->pEquiv = Ivy_ManConst1(pNew);
+    Ivy_ManForEachPi( p, pObj, i )
+        pObj->pEquiv = Ivy_ObjCreatePi(pNew);
+    // create the fake PIs for latches
+    Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+        pObj->pEquiv = Ivy_ObjCreatePi(pNew);
+    // duplicate internal nodes
+    Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+        if ( Ivy_ObjIsBuf(pObj) )
+            pObj->pEquiv = Ivy_ObjChild0Equiv(pObj);
+        else
+            pObj->pEquiv = Ivy_And( pNew, Ivy_ObjChild0Equiv(pObj), Ivy_ObjChild1Equiv(pObj) );
+    // add the POs
+    Ivy_ManForEachPo( p, pObj, i )
+        Ivy_ObjCreatePo( pNew, Ivy_ObjChild0Equiv(pObj) );
+    // transform additional PI nodes into latches and connect them
+    Ivy_ManForEachNodeVec( p, vLatches, pObj, i )
+    {
+        assert( !Ivy_ObjFaninC0(pObj) );
+        pObj->pEquiv->Type = IVY_LATCH;
+        pObj->pEquiv->Init = pObj->Init;
+        Ivy_ObjConnect( pNew, pObj->pEquiv, Ivy_ObjChild0Equiv(pObj), NULL );
+    }
+    // shrink the arrays
+    Vec_PtrShrink( pNew->vPis, Ivy_ManPiNum(p) );
+    // update the counters of different objects
+    pNew->nObjs[IVY_PI] -= Ivy_ManLatchNum(p);
+    pNew->nObjs[IVY_LATCH] += Ivy_ManLatchNum(p);
+    // free arrays
+    Vec_IntFree( vNodes );
+    Vec_IntFree( vLatches );
+    // make sure structural hashing did not change anything
+    assert( Ivy_ManNodeNum(p)  == Ivy_ManNodeNum(pNew) );
+    assert( Ivy_ManLatchNum(p) == Ivy_ManLatchNum(pNew) );
+    // check the resulting network
+    if ( !Ivy_ManCheck(pNew) )
+        printf( "Ivy_ManMakeSeq(): The check has failed.\n" );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManFrames( Ivy_Man_t * pMan, int nLatches, int nFrames, int fInit, Vec_Ptr_t ** pvMapping )
+{
+    Vec_Ptr_t * vMapping;
+    Ivy_Man_t * pNew;
+    Ivy_Obj_t * pObj;
+    int i, f, nPis, nPos, nIdMax;
+    assert( Ivy_ManLatchNum(pMan) == 0 );
+    assert( nFrames > 0 );
+    // prepare the mapping
+    nPis = Ivy_ManPiNum(pMan) - nLatches;
+    nPos = Ivy_ManPoNum(pMan) - nLatches;
+    nIdMax = Ivy_ManObjIdMax(pMan);
+    // create the new manager
+    pNew = Ivy_ManStart();
+    // set the starting values of latch inputs
+    for ( i = 0; i < nLatches; i++ )
+        Ivy_ManPo(pMan, nPos+i)->pEquiv = fInit? Ivy_Not(Ivy_ManConst1(pNew)) : Ivy_ObjCreatePi(pNew);
+    // add timeframes
+    vMapping = Vec_PtrStart( nIdMax * nFrames + 1 );
+    for ( f = 0; f < nFrames; f++ )
+    {
+        // create PIs
+        Ivy_ManConst1(pMan)->pEquiv = Ivy_ManConst1(pNew);
+        for ( i = 0; i < nPis; i++ )
+            Ivy_ManPi(pMan, i)->pEquiv = Ivy_ObjCreatePi(pNew);
+        // transfer values to latch outputs
+        for ( i = 0; i < nLatches; i++ )
+            Ivy_ManPi(pMan, nPis+i)->pEquiv = Ivy_ManPo(pMan, nPos+i)->pEquiv;
+        // perform strashing
+        Ivy_ManForEachNode( pMan, pObj, i )
+            pObj->pEquiv = Ivy_And( pNew, Ivy_ObjChild0Equiv(pObj), Ivy_ObjChild1Equiv(pObj) );
+        // create POs
+        for ( i = 0; i < nPos; i++ )
+            Ivy_ManPo(pMan, i)->pEquiv = Ivy_ObjCreatePo( pNew, Ivy_ObjChild0Equiv(Ivy_ManPo(pMan, i)) );
+        // set the results of latch inputs
+        for ( i = 0; i < nLatches; i++ )
+            Ivy_ManPo(pMan, nPos+i)->pEquiv = Ivy_ObjChild0Equiv(Ivy_ManPo(pMan, nPos+i));
+        // save the pointers in this frame
+        Ivy_ManForEachObj( pMan, pObj, i )
+            Vec_PtrWriteEntry( vMapping, f * nIdMax + i, pObj->pEquiv );
+    }
+    // connect latches
+    if ( !fInit )
+        for ( i = 0; i < nLatches; i++ )
+            Ivy_ObjCreatePo( pNew, Ivy_ManPo(pMan, nPos+i)->pEquiv );
+    // remove dangling nodes
+    Ivy_ManCleanup(pNew);
+    *pvMapping = vMapping;
+    // check the resulting network
+    if ( !Ivy_ManCheck(pNew) )
+        printf( "Ivy_ManFrames(): The check has failed.\n" );
+    return pNew;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManStop( Ivy_Man_t * p )
+{
+    if ( p->time1 ) { PRT( "Update lev  ", p->time1 ); }
+    if ( p->time2 ) { PRT( "Update levR ", p->time2 ); }
+//    Ivy_TableProfile( p );
+//    if ( p->vFanouts )  Ivy_ManStopFanout( p );
+    if ( p->vChunks )   Ivy_ManStopMemory( p );
+    if ( p->vRequired ) Vec_IntFree( p->vRequired );
+    if ( p->vPis )      Vec_PtrFree( p->vPis );
+    if ( p->vPos )      Vec_PtrFree( p->vPos );
+    if ( p->vBufs )     Vec_PtrFree( p->vBufs );
+    if ( p->vObjs )     Vec_PtrFree( p->vObjs );
+    free( p->pTable );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes nodes without fanout.]
+
+  Description [Returns the number of dangling nodes removed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCleanup( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pNode;
+    int i, nNodesOld;
+    nNodesOld = Ivy_ManNodeNum(p);
+    Ivy_ManForEachObj( p, pNode, i )
+        if ( Ivy_ObjIsNode(pNode) || Ivy_ObjIsLatch(pNode) || Ivy_ObjIsBuf(pNode) )
+            if ( Ivy_ObjRefs(pNode) == 0 )
+                Ivy_ObjDelete_rec( p, pNode, 1 );
+//printf( "Cleanup removed %d nodes.\n", nNodesOld - Ivy_ManNodeNum(p) );
+    return nNodesOld - Ivy_ManNodeNum(p);
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Marks nodes reachable from the given one.]
+
+  Description [Returns the number of dangling nodes removed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCleanupSeq_rec( Ivy_Obj_t * pObj )
+{
+    if ( Ivy_ObjIsMarkA(pObj) )
+        return;
+    Ivy_ObjSetMarkA(pObj);
+    if ( pObj->pFanin0 != NULL )
+        Ivy_ManCleanupSeq_rec( Ivy_ObjFanin0(pObj) );
+    if ( pObj->pFanin1 != NULL )
+        Ivy_ManCleanupSeq_rec( Ivy_ObjFanin1(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Removes logic that does not feed into POs.]
+
+  Description [Returns the number of dangling nodes removed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManCleanupSeq( Ivy_Man_t * p )
+{
+    Vec_Ptr_t * vNodes;
+    Ivy_Obj_t * pObj;
+    int i, RetValue;
+    // mark the constant and PIs
+    Ivy_ObjSetMarkA( Ivy_ManConst1(p) );
+    Ivy_ManForEachPi( p, pObj, i )
+        Ivy_ObjSetMarkA( pObj );
+    // mark nodes visited from POs
+    Ivy_ManForEachPo( p, pObj, i )
+        Ivy_ManCleanupSeq_rec( pObj );
+    // collect unmarked nodes
+    vNodes = Vec_PtrAlloc( 100 );
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( Ivy_ObjIsMarkA(pObj) )
+            Ivy_ObjClearMarkA(pObj);
+        else
+            Vec_PtrPush( vNodes, pObj );
+    }
+    if ( Vec_PtrSize(vNodes) == 0 )
+    {
+        Vec_PtrFree( vNodes );
+//printf( "Sequential sweep cleaned out %d nodes.\n", 0 );
+        return 0;
+    }
+    // disconnect the marked objects
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+        Ivy_ObjDisconnect( p, pObj );
+    // remove the dangling objects
+    Vec_PtrForEachEntry( vNodes, pObj, i )
+    {
+        assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsLatch(pObj) || Ivy_ObjIsBuf(pObj) );
+        assert( Ivy_ObjRefs(pObj) == 0 );
+        // update node counters of the manager
+        p->nObjs[pObj->Type]--;
+        p->nDeleted++;
+        // delete buffer from the array of buffers
+        if ( p->fFanout && Ivy_ObjIsBuf(pObj) )
+            Vec_PtrRemove( p->vBufs, pObj );
+        // free the node
+        Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+        Ivy_ManRecycleMemory( p, pObj );
+    }
+    // return the number of nodes freed
+    RetValue = Vec_PtrSize(vNodes);
+    Vec_PtrFree( vNodes );
+//printf( "Sequential sweep cleaned out %d nodes.\n", RetValue );
+    return RetValue;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if latches form self-loop.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManLatchIsSelfFeed_rec( Ivy_Obj_t * pLatch, Ivy_Obj_t * pLatchRoot )
+{
+    if ( !Ivy_ObjIsLatch(pLatch) && !Ivy_ObjIsBuf(pLatch) )
+        return 0;
+    if ( pLatch == pLatchRoot )
+        return 1;
+    return Ivy_ManLatchIsSelfFeed_rec( Ivy_ObjFanin0(pLatch), pLatchRoot );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if latches form self-loop.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManLatchIsSelfFeed( Ivy_Obj_t * pLatch )
+{
+    if ( !Ivy_ObjIsLatch(pLatch) )
+        return 0;
+    return Ivy_ManLatchIsSelfFeed_rec( Ivy_ObjFanin0(pLatch), pLatch );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of dangling nodes removed.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     [] 
+
+***********************************************************************/
+int Ivy_ManPropagateBuffers( Ivy_Man_t * p, int fUpdateLevel )
+{
+    Ivy_Obj_t * pNode;
+    int LimitFactor = 100;
+    int NodeBeg = Ivy_ManNodeNum(p);
+    int nSteps;
+    for ( nSteps = 0; Vec_PtrSize(p->vBufs) > 0; nSteps++ )
+    {
+        pNode = Vec_PtrEntryLast(p->vBufs);
+        while ( Ivy_ObjIsBuf(pNode) )
+            pNode = Ivy_ObjReadFirstFanout( p, pNode );
+        // check if this buffer should remain
+        if ( Ivy_ManLatchIsSelfFeed(pNode) )
+        {
+            Vec_PtrPop(p->vBufs);
+            continue;
+        }
+//printf( "Propagating buffer %d with input %d and output %d\n", Ivy_ObjFaninId0(pNode), Ivy_ObjFaninId0(Ivy_ObjFanin0(pNode)), pNode->Id );
+//printf( "Latch num %d\n", Ivy_ManLatchNum(p) );
+        Ivy_NodeFixBufferFanins( p, pNode, fUpdateLevel );
+        if ( nSteps > NodeBeg * LimitFactor )
+        {
+            printf( "Structural hashing is not finished after %d forward latch moves.\n", NodeBeg * LimitFactor );
+            printf( "This circuit cannot be forward-retimed completely. Quitting.\n" );
+            break;
+        }
+    }
+//    printf( "Number of steps = %d. Nodes beg = %d. Nodes end = %d.\n", nSteps, NodeBeg, Ivy_ManNodeNum(p) );
+    return nSteps;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the AIG manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManPrintStats( Ivy_Man_t * p )
+{
+    printf( "PI/PO = %d/%d ", Ivy_ManPiNum(p), Ivy_ManPoNum(p) );
+    printf( "A = %7d. ",       Ivy_ManAndNum(p) );
+    printf( "L = %5d. ",       Ivy_ManLatchNum(p) );
+//    printf( "X = %d. ",       Ivy_ManExorNum(p) );
+//    printf( "B = %3d. ",       Ivy_ManBufNum(p) );
+    printf( "MaxID = %7d. ",   Ivy_ManObjIdMax(p) );
+//    printf( "Cre = %d. ",     p->nCreated );
+//    printf( "Del = %d. ",     p->nDeleted );
+    printf( "Lev = %3d. ",     Ivy_ManLatchNum(p)? -1 : Ivy_ManLevels(p) );
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts a combinational AIG manager into a sequential one.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManMakeSeq( Ivy_Man_t * p, int nLatches, int * pInits )
+{
+    Ivy_Obj_t * pObj, * pLatch;
+    Ivy_Init_t Init;
+    int i;
+    if ( nLatches == 0 )
+        return;
+    assert( nLatches < Ivy_ManPiNum(p) && nLatches < Ivy_ManPoNum(p) );
+    assert( Ivy_ManPiNum(p) == Vec_PtrSize(p->vPis) );
+    assert( Ivy_ManPoNum(p) == Vec_PtrSize(p->vPos) );
+    assert( Vec_PtrSize( p->vBufs ) == 0 );
+    // create fanouts
+    if ( p->fFanout == 0 )
+        Ivy_ManStartFanout( p );
+    // collect the POs to be converted into latches
+    for ( i = 0; i < nLatches; i++ )
+    {
+        // get the latch value
+        Init = pInits? pInits[i] : IVY_INIT_0;
+        // create latch
+        pObj = Ivy_ManPo( p, Ivy_ManPoNum(p) - nLatches + i );
+        pLatch = Ivy_Latch( p, Ivy_ObjChild0(pObj), Init );
+        Ivy_ObjDisconnect( p, pObj );
+        // recycle the old PO object
+        Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+        Ivy_ManRecycleMemory( p, pObj );
+        // convert the corresponding PI to a buffer and connect it to the latch
+        pObj = Ivy_ManPi( p, Ivy_ManPiNum(p) - nLatches + i );
+        pObj->Type = IVY_BUF;
+        Ivy_ObjConnect( p, pObj, pLatch, NULL );
+        // save the buffer
+        Vec_PtrPush( p->vBufs, pObj );
+    }
+    // shrink the arrays
+    Vec_PtrShrink( p->vPis, Ivy_ManPiNum(p) - nLatches );
+    Vec_PtrShrink( p->vPos, Ivy_ManPoNum(p) - nLatches );
+    // update the counters of different objects
+    p->nObjs[IVY_PI] -= nLatches;
+    p->nObjs[IVY_PO] -= nLatches;
+    p->nObjs[IVY_BUF] += nLatches;
+    p->nDeleted -= 2 * nLatches;
+    // remove dangling nodes
+    Ivy_ManCleanup(p);
+    Ivy_ManCleanupSeq(p);
+/* 
+    // check for dangling nodes
+    Ivy_ManForEachObj( p, pObj, i )
+        if ( !Ivy_ObjIsPi(pObj) && !Ivy_ObjIsPo(pObj) && !Ivy_ObjIsConst1(pObj) )
+        {
+            assert( Ivy_ObjRefs(pObj) > 0 );
+            assert( Ivy_ObjRefs(pObj) == Ivy_ObjFanoutNum(p, pObj) );
+        }
+*/
+    // perform hashing by propagating the buffers
+    Ivy_ManPropagateBuffers( p, 0 );
+    if ( Ivy_ManBufNum(p) )
+        printf( "The number of remaining buffers is %d.\n", Ivy_ManBufNum(p) );
+    // fix the levels
+    Ivy_ManResetLevels( p );
+    // check the resulting network
+    if ( !Ivy_ManCheck(p) )
+        printf( "Ivy_ManMakeSeq(): The check has failed.\n" );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyMem.c b/abc70930/src/aig/ivy/ivyMem.c
new file mode 100644
index 00000000..2a96857c
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyMem.c
@@ -0,0 +1,116 @@
+/**CFile****************************************************************
+
+  FileName    [ivyMem.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Memory management for the AIG nodes.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyMem.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// memory management
+#define IVY_PAGE_SIZE      12        // page size containing 2^IVY_PAGE_SIZE nodes
+#define IVY_PAGE_MASK    4095        // page bitmask (2^IVY_PAGE_SIZE)-1
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the internal memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManStartMemory( Ivy_Man_t * p )
+{
+    p->vChunks = Vec_PtrAlloc( 128 );
+    p->vPages = Vec_PtrAlloc( 128 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the internal memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManStopMemory( Ivy_Man_t * p )
+{
+    void * pMemory;
+    int i;
+    Vec_PtrForEachEntry( p->vChunks, pMemory, i )
+        free( pMemory );
+    Vec_PtrFree( p->vChunks );
+    Vec_PtrFree( p->vPages );
+    p->pListFree = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates additional memory for the nodes.]
+
+  Description [Allocates IVY_PAGE_SIZE nodes. Aligns memory by 32 bytes. 
+  Records the pointer to the AIG manager in the -1 entry.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManAddMemory( Ivy_Man_t * p )
+{
+    char * pMemory;
+    int i, nBytes;
+    int EntrySizeMax = 128;
+    assert( sizeof(Ivy_Obj_t) <= EntrySizeMax );
+    assert( p->pListFree == NULL );
+//    assert( (Ivy_ManObjNum(p) & IVY_PAGE_MASK) == 0 );
+    // allocate new memory page
+    nBytes = sizeof(Ivy_Obj_t) * (1<<IVY_PAGE_SIZE) + EntrySizeMax;
+    pMemory = ALLOC( char, nBytes );
+    Vec_PtrPush( p->vChunks, pMemory );
+    // align memory at the 32-byte boundary
+    pMemory = pMemory + EntrySizeMax - (((int)pMemory) & (EntrySizeMax-1));
+    // remember the manager in the first entry
+    Vec_PtrPush( p->vPages, pMemory );
+    // break the memory down into nodes
+    p->pListFree = (Ivy_Obj_t *)pMemory;
+    for ( i = 1; i <= IVY_PAGE_MASK; i++ )
+    {
+        *((char **)pMemory) = pMemory + sizeof(Ivy_Obj_t);
+        pMemory += sizeof(Ivy_Obj_t);
+    }
+    *((char **)pMemory) = NULL;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyMulti.c b/abc70930/src/aig/ivy/ivyMulti.c
new file mode 100644
index 00000000..a7970156
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyMulti.c
@@ -0,0 +1,301 @@
+/**CFile****************************************************************
+
+  FileName    [ivyMulti.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Constructing multi-input AND/EXOR gates.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyMulti.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+#define IVY_EVAL_LIMIT    128
+
+typedef struct Ivy_Eva_t_ Ivy_Eva_t;
+struct Ivy_Eva_t_
+{
+    Ivy_Obj_t * pArg;     // the argument node
+    unsigned    Mask;     // the mask of covered nodes
+    int         Weight;   // the number of covered nodes
+};
+
+static void Ivy_MultiPrint( Ivy_Man_t * p, Ivy_Eva_t * pEvals, int nLeaves, int nEvals );
+static int Ivy_MultiCover( Ivy_Man_t * p, Ivy_Eva_t * pEvals, int nLeaves, int nEvals, int nLimit, Vec_Ptr_t * vSols );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs a balanced tree while taking sharing into account.]
+
+  Description [Returns 1 if the implementation exists.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_MultiPlus( Ivy_Man_t * p, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone, Ivy_Type_t Type, int nLimit, Vec_Ptr_t * vSols )
+{
+    static Ivy_Eva_t pEvals[IVY_EVAL_LIMIT];
+    Ivy_Eva_t * pEval, * pFan0, * pFan1;
+    Ivy_Obj_t * pObj, * pTemp;
+    int nEvals, nEvalsOld, i, k, x, nLeaves;
+    unsigned uMaskAll;
+
+    // consider special cases
+    nLeaves = Vec_PtrSize(vLeaves);
+    assert( nLeaves > 2 );
+    if ( nLeaves > 32 || nLeaves + Vec_PtrSize(vCone) > IVY_EVAL_LIMIT )
+        return 0;
+//    if ( nLeaves == 1 )
+//        return Vec_PtrEntry( vLeaves, 0 );
+//    if ( nLeaves == 2 )
+//        return Ivy_Oper( Vec_PtrEntry(vLeaves, 0), Vec_PtrEntry(vLeaves, 1), Type );
+
+    // set the leaf entries
+    uMaskAll = ((1 << nLeaves) - 1);
+    nEvals = 0;
+    Vec_PtrForEachEntry( vLeaves, pObj, i )
+    {
+        pEval = pEvals + nEvals;
+        pEval->pArg   = pObj;
+        pEval->Mask   = (1 << nEvals);
+        pEval->Weight = 1;
+        // mark the leaf
+        Ivy_Regular(pObj)->TravId = nEvals;
+        nEvals++;
+    }
+
+    // propagate masks through the cone
+    Vec_PtrForEachEntry( vCone, pObj, i )
+    {
+        pObj->TravId = nEvals + i;
+        if ( Ivy_ObjIsBuf(pObj) )
+            pEvals[pObj->TravId].Mask = pEvals[Ivy_ObjFanin0(pObj)->TravId].Mask;
+        else
+            pEvals[pObj->TravId].Mask = pEvals[Ivy_ObjFanin0(pObj)->TravId].Mask | pEvals[Ivy_ObjFanin1(pObj)->TravId].Mask;
+    }
+
+    // set the internal entries
+    Vec_PtrForEachEntry( vCone, pObj, i )
+    {
+        if ( i == Vec_PtrSize(vCone) - 1 )
+            break;
+        // skip buffers
+        if ( Ivy_ObjIsBuf(pObj) )
+            continue;
+        // skip nodes without external fanout
+        if ( Ivy_ObjRefs(pObj) == 0 )
+            continue;
+        assert( !Ivy_IsComplement(pObj) );
+        pEval = pEvals + nEvals;
+        pEval->pArg   = pObj;
+        pEval->Mask   = pEvals[pObj->TravId].Mask;
+        pEval->Weight = Extra_WordCountOnes(pEval->Mask);
+        // mark the node
+        pObj->TravId = nEvals;
+        nEvals++;
+    }
+
+    // find the available nodes
+    nEvalsOld = nEvals;
+    for ( i = 1; i < nEvals; i++ )
+    for ( k = 0; k < i; k++ )
+    {
+        pFan0 = pEvals + i;
+        pFan1 = pEvals + k;
+        pTemp = Ivy_TableLookup(p, Ivy_ObjCreateGhost(p, pFan0->pArg, pFan1->pArg, Type, IVY_INIT_NONE));
+        // skip nodes in the cone
+        if ( pTemp == NULL || pTemp->fMarkB )
+            continue;
+        // skip the leaves
+        for ( x = 0; x < nLeaves; x++ )
+            if ( pTemp == Ivy_Regular(vLeaves->pArray[x]) )
+                break;
+        if ( x < nLeaves )
+            continue;
+        pEval = pEvals + nEvals;
+        pEval->pArg   = pTemp;
+        pEval->Mask   = pFan0->Mask | pFan1->Mask;
+        pEval->Weight = (pFan0->Mask & pFan1->Mask) ? Extra_WordCountOnes(pEval->Mask) : pFan0->Weight + pFan1->Weight;
+        // save the argument
+        pObj->TravId = nEvals;
+        nEvals++;
+        // quit if the number of entries exceeded the limit
+        if ( nEvals == IVY_EVAL_LIMIT )
+            goto Outside;
+        // quit if we found an acceptable implementation
+        if ( pEval->Mask == uMaskAll )
+            goto Outside;
+    }
+Outside:
+
+//    Ivy_MultiPrint( pEvals, nLeaves, nEvals );
+    if ( !Ivy_MultiCover( p, pEvals, nLeaves, nEvals, nLimit, vSols ) )
+        return 0;
+    assert( Vec_PtrSize( vSols ) > 0 );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes how many uncovered ones this one covers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_MultiPrint( Ivy_Man_t * p, Ivy_Eva_t * pEvals, int nLeaves, int nEvals )
+{
+    Ivy_Eva_t * pEval;
+    int i, k;
+    for ( i = nLeaves; i < nEvals; i++ )
+    {
+        pEval = pEvals + i;
+        printf( "%2d  (id = %5d)  : |", i-nLeaves, Ivy_ObjId(pEval->pArg) );
+        for ( k = 0; k < nLeaves; k++ )
+        {
+            if ( pEval->Mask & (1 << k) )
+                printf( "+" );
+            else
+                printf( " " );
+        }
+        printf( "|  Lev = %d.\n", Ivy_ObjLevel(pEval->pArg) );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes how many uncovered ones this one covers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_MultiWeight( unsigned uMask, int nMaskOnes, unsigned uFound )
+{
+    assert( uMask & ~uFound );
+    if ( (uMask & uFound) == 0 )
+        return nMaskOnes;
+    return Extra_WordCountOnes( uMask & ~uFound );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finds the cover.]
+
+  Description [Returns 1 if the cover is found.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_MultiCover( Ivy_Man_t * p, Ivy_Eva_t * pEvals, int nLeaves, int nEvals, int nLimit, Vec_Ptr_t * vSols )
+{
+    int fVerbose = 0;
+    Ivy_Eva_t * pEval, * pEvalBest;
+    unsigned uMaskAll, uFound, uTemp;
+    int i, k, BestK, WeightBest, WeightCur, LevelBest, LevelCur;
+    uMaskAll = (nLeaves == 32)? (~(unsigned)0) : ((1 << nLeaves) - 1);
+    uFound = 0;
+    // solve the covering problem
+    if ( fVerbose )
+    printf( "Solution:  " );
+    Vec_PtrClear( vSols );
+    for ( i = 0; i < nLimit; i++ )
+    {
+        BestK = -1;
+        for ( k = nEvals - 1; k >= 0; k-- )
+        {
+            pEval = pEvals + k;
+            if ( (pEval->Mask & ~uFound) == 0 )
+                continue;
+            if ( BestK == -1 )
+            {
+                BestK      = k;
+                pEvalBest  = pEval;
+                WeightBest = Ivy_MultiWeight( pEvalBest->Mask, pEvalBest->Weight, uFound );
+                LevelBest  = Ivy_ObjLevel( Ivy_Regular(pEvalBest->pArg) );
+                continue;
+            }
+            // compare BestK and the new one (k)
+            WeightCur = Ivy_MultiWeight( pEval->Mask, pEval->Weight, uFound );
+            LevelCur = Ivy_ObjLevel( Ivy_Regular(pEval->pArg) );
+            if ( WeightBest < WeightCur || 
+                (WeightBest == WeightCur && LevelBest > LevelCur) )
+            {
+                BestK      = k;
+                pEvalBest  = pEval;
+                WeightBest = WeightCur;
+                LevelBest  = LevelCur;
+            }
+        }
+        assert( BestK != -1 );
+        // if the cost is only 1, take the leaf
+        if ( WeightBest == 1 && BestK >= nLeaves )
+        {
+            uTemp = (pEvalBest->Mask & ~uFound);
+            for ( k = 0; k < nLeaves; k++ )
+                if ( uTemp & (1 << k) )
+                    break;
+            assert( k < nLeaves );
+            BestK     = k;
+            pEvalBest = pEvals + BestK;
+        }
+        if ( fVerbose )
+        {
+            if ( BestK < nLeaves )
+                printf( "L(%d) ", BestK );
+            else
+                printf( "%d ", BestK - nLeaves );
+        }
+        // update the found set
+        Vec_PtrPush( vSols, pEvalBest->pArg );
+        uFound |= pEvalBest->Mask;
+        if ( uFound == uMaskAll )
+            break;
+    }
+    if ( uFound == uMaskAll )
+    {
+        if ( fVerbose )
+            printf( "  Found \n\n" );
+        return 1;
+    }
+    else
+    {
+        if ( fVerbose )
+            printf( "  Not found \n\n" );
+        return 0;
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyMulti8.c b/abc70930/src/aig/ivy/ivyMulti8.c
new file mode 100644
index 00000000..059d1500
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyMulti8.c
@@ -0,0 +1,427 @@
+/**CFile****************************************************************
+
+  FileName    [ivyMulti.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Constructing multi-input AND/EXOR gates.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyMulti.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Ivy_Eval_t_ Ivy_Eval_t;
+struct Ivy_Eval_t_
+{
+    unsigned Mask   :  5;  // the mask of covered nodes
+    unsigned Weight :  3;  // the number of covered nodes
+    unsigned Cost   :  4;  // the number of overlapping nodes
+    unsigned Level  : 12;  // the level of this node
+    unsigned Fan0   :  4;  // the first fanin
+    unsigned Fan1   :  4;  // the second fanin
+};
+
+static Ivy_Obj_t * Ivy_MultiBuild_rec( Ivy_Eval_t * pEvals, int iNum, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type );
+static void        Ivy_MultiSort( Ivy_Obj_t ** pArgs, int nArgs );
+static int         Ivy_MultiPushUniqueOrderByLevel( Ivy_Obj_t ** pArray, int nArgs, Ivy_Obj_t * pNode );
+static Ivy_Obj_t * Ivy_MultiEval( Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type );
+
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs the well-balanced tree of gates.]
+
+  Description [Disregards levels and possible logic sharing.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi_rec( Ivy_Obj_t ** ppObjs, int nObjs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pObj1, * pObj2;
+    if ( nObjs == 1 )
+        return ppObjs[0];
+    pObj1 = Ivy_Multi_rec( ppObjs,           nObjs/2,         Type );
+    pObj2 = Ivy_Multi_rec( ppObjs + nObjs/2, nObjs - nObjs/2, Type );
+    return Ivy_Oper( pObj1, pObj2, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs a balanced tree while taking sharing into account.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi( Ivy_Obj_t ** pArgsInit, int nArgs, Ivy_Type_t Type )
+{
+    static char NumBits[32] = {0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5};
+    static Ivy_Eval_t pEvals[15+15*14/2];
+    static Ivy_Obj_t * pArgs[16];
+    Ivy_Eval_t * pEva, * pEvaBest;
+    int nArgsNew, nEvals, i, k;
+    Ivy_Obj_t * pTemp;
+
+    // consider the case of one argument
+    assert( nArgs > 0 );
+    if ( nArgs == 1 )
+        return pArgsInit[0];
+    // consider the case of two arguments
+    if ( nArgs == 2 )
+        return Ivy_Oper( pArgsInit[0], pArgsInit[1], Type );
+
+//Ivy_MultiEval( pArgsInit, nArgs, Type ); printf( "\n" );
+
+    // set the initial ones
+    for ( i = 0; i < nArgs; i++ )
+    {
+        pArgs[i] = pArgsInit[i];
+        pEva = pEvals + i;
+        pEva->Mask   = (1 << i);
+        pEva->Weight = 1;
+        pEva->Cost   = 0; 
+        pEva->Level  = Ivy_Regular(pArgs[i])->Level; 
+        pEva->Fan0   = 0; 
+        pEva->Fan1   = 0; 
+    }
+
+    // find the available nodes
+    pEvaBest = pEvals;
+    nArgsNew = nArgs;
+    for ( i = 1; i < nArgsNew; i++ )
+    for ( k = 0; k < i; k++ )
+        if ( pTemp = Ivy_TableLookup(Ivy_ObjCreateGhost(pArgs[k], pArgs[i], Type, IVY_INIT_NONE)) )
+        {
+            pEva = pEvals + nArgsNew;
+            pEva->Mask   = pEvals[k].Mask | pEvals[i].Mask;
+            pEva->Weight = NumBits[pEva->Mask];
+            pEva->Cost   = pEvals[k].Cost + pEvals[i].Cost + NumBits[pEvals[k].Mask & pEvals[i].Mask]; 
+            pEva->Level  = 1 + IVY_MAX(pEvals[k].Level, pEvals[i].Level); 
+            pEva->Fan0   = k; 
+            pEva->Fan1   = i; 
+//            assert( pEva->Level == (unsigned)Ivy_ObjLevel(pTemp) );
+            // compare
+            if ( pEvaBest->Weight < pEva->Weight ||
+                 pEvaBest->Weight == pEva->Weight && pEvaBest->Cost > pEva->Cost ||
+                 pEvaBest->Weight == pEva->Weight && pEvaBest->Cost == pEva->Cost && pEvaBest->Level > pEva->Level )
+                 pEvaBest = pEva;
+            // save the argument
+            pArgs[nArgsNew++] = pTemp;
+            if ( nArgsNew == 15 )
+                goto Outside;
+        }
+Outside:
+
+//    printf( "Best = %d.\n", pEvaBest - pEvals );
+
+    // the case of no common nodes
+    if ( nArgsNew == nArgs )
+    {
+        Ivy_MultiSort( pArgs, nArgs );
+        return Ivy_MultiBalance_rec( pArgs, nArgs, Type );
+    }
+    // the case of one common node
+    if ( nArgsNew == nArgs + 1 )
+    {
+        assert( pEvaBest - pEvals == nArgs );
+        k = 0;
+        for ( i = 0; i < nArgs; i++ )
+            if ( i != (int)pEvaBest->Fan0 && i != (int)pEvaBest->Fan1 )
+                pArgs[k++] = pArgs[i];
+        pArgs[k++] = pArgs[nArgs];
+        assert( k == nArgs - 1 );
+        nArgs = k;
+        Ivy_MultiSort( pArgs, nArgs );
+        return Ivy_MultiBalance_rec( pArgs, nArgs, Type );
+    }
+    // the case when there is a node that covers everything
+    if ( (int)pEvaBest->Mask == ((1 << nArgs) - 1) )
+        return Ivy_MultiBuild_rec( pEvals, pEvaBest - pEvals, pArgs, nArgsNew, Type ); 
+
+    // evaluate node pairs
+    nEvals = nArgsNew;
+    for ( i = 1; i < nArgsNew; i++ )
+    for ( k = 0; k < i; k++ )
+    {
+        pEva = pEvals + nEvals;
+        pEva->Mask   = pEvals[k].Mask | pEvals[i].Mask;
+        pEva->Weight = NumBits[pEva->Mask];
+        pEva->Cost   = pEvals[k].Cost + pEvals[i].Cost + NumBits[pEvals[k].Mask & pEvals[i].Mask]; 
+        pEva->Level  = 1 + IVY_MAX(pEvals[k].Level, pEvals[i].Level); 
+        pEva->Fan0   = k; 
+        pEva->Fan1   = i; 
+        // compare
+        if ( pEvaBest->Weight < pEva->Weight ||
+             pEvaBest->Weight == pEva->Weight && pEvaBest->Cost > pEva->Cost ||
+             pEvaBest->Weight == pEva->Weight && pEvaBest->Cost == pEva->Cost && pEvaBest->Level > pEva->Level )
+             pEvaBest = pEva;
+        // save the argument
+        nEvals++;
+    }
+    assert( pEvaBest - pEvals >= nArgsNew );
+
+//    printf( "Used (%d, %d).\n", pEvaBest->Fan0, pEvaBest->Fan1 );
+
+    // get the best implementation
+    pTemp = Ivy_MultiBuild_rec( pEvals, pEvaBest - pEvals, pArgs, nArgsNew, Type );
+
+    // collect those not covered by EvaBest
+    k = 0;
+    for ( i = 0; i < nArgs; i++ )
+        if ( (pEvaBest->Mask & (1 << i)) == 0 )
+            pArgs[k++] = pArgs[i];
+    pArgs[k++] = pTemp;
+    assert( k == nArgs - (int)pEvaBest->Weight + 1 );
+    nArgs = k;
+    Ivy_MultiSort( pArgs, nArgs );
+    return Ivy_MultiBalance_rec( pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements multi-input AND/EXOR operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_MultiBuild_rec( Ivy_Eval_t * pEvals, int iNum, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pNode0, * pNode1;
+    if ( iNum < nArgs )
+        return pArgs[iNum];
+    pNode0 = Ivy_MultiBuild_rec( pEvals, pEvals[iNum].Fan0, pArgs, nArgs, Type );
+    pNode1 = Ivy_MultiBuild_rec( pEvals, pEvals[iNum].Fan1, pArgs, nArgs, Type );
+    return Ivy_Oper( pNode0, pNode1, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Selection-sorts the nodes in the decreasing over of level.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_MultiSort( Ivy_Obj_t ** pArgs, int nArgs )
+{
+    Ivy_Obj_t * pTemp;
+    int i, j, iBest;
+
+    for ( i = 0; i < nArgs-1; i++ )
+    {
+        iBest = i;
+        for ( j = i+1; j < nArgs; j++ )
+            if ( Ivy_Regular(pArgs[j])->Level > Ivy_Regular(pArgs[iBest])->Level )
+                iBest = j;
+        pTemp = pArgs[i]; 
+        pArgs[i] = pArgs[iBest]; 
+        pArgs[iBest] = pTemp;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Inserts a new node in the order by levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_MultiPushUniqueOrderByLevel( Ivy_Obj_t ** pArray, int nArgs, Ivy_Obj_t * pNode )
+{
+    Ivy_Obj_t * pNode1, * pNode2;
+    int i;
+    // try to find the node in the array
+    for ( i = 0; i < nArgs; i++ )
+        if ( pArray[i] == pNode )
+            return nArgs;
+    // put the node last
+    pArray[nArgs++] = pNode;
+    // find the place to put the new node
+    for ( i = nArgs-1; i > 0; i-- )
+    {
+        pNode1 = pArray[i  ];
+        pNode2 = pArray[i-1];
+        if ( Ivy_Regular(pNode1)->Level <= Ivy_Regular(pNode2)->Level )
+            break;
+        pArray[i  ] = pNode2;
+        pArray[i-1] = pNode1;
+    }
+    return nArgs;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Balances the array recursively.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_MultiBalance_rec( Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pNodeNew;
+    // consider the case of one argument
+    assert( nArgs > 0 );
+    if ( nArgs == 1 )
+        return pArgs[0];
+    // consider the case of two arguments
+    if ( nArgs == 2 )
+        return Ivy_Oper( pArgs[0], pArgs[1], Type );
+    // get the last two nodes
+    pNodeNew = Ivy_Oper( pArgs[nArgs-1], pArgs[nArgs-2], Type );
+    // add the new node
+    nArgs = Ivy_MultiPushUniqueOrderByLevel( pArgs, nArgs - 2, pNodeNew );
+    return Ivy_MultiBalance_rec( pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements multi-input AND/EXOR operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_MultiEval( Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pTemp;
+    int i, k;
+    int nArgsOld = nArgs;
+    for ( i = 0; i < nArgs; i++ )
+        printf( "%d[%d] ", i, Ivy_Regular(pArgs[i])->Level );
+    for ( i = 1; i < nArgs; i++ )
+        for ( k = 0; k < i; k++ )
+        {
+            pTemp = Ivy_TableLookup(Ivy_ObjCreateGhost(pArgs[k], pArgs[i], Type, IVY_INIT_NONE));
+            if ( pTemp != NULL )
+            {
+                printf( "%d[%d]=(%d,%d) ", nArgs, Ivy_Regular(pTemp)->Level, k, i );
+                pArgs[nArgs++] = pTemp;
+            }
+        }
+    printf( "     ((%d/%d))    ", nArgsOld, nArgs-nArgsOld );
+    return NULL;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Old code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi1( Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pArgsRef[5], * pTemp;
+    int i, k, m, nArgsNew, Counter = 0;
+ 
+    
+//Ivy_MultiEval( pArgs, nArgs, Type );  printf( "\n" );
+
+
+    assert( Type == IVY_AND || Type == IVY_EXOR );
+    assert( nArgs > 0 );
+    if ( nArgs == 1 )
+        return pArgs[0];
+
+    // find the nodes with more than one fanout
+    nArgsNew = 0;
+    for ( i = 0; i < nArgs; i++ )
+        if ( Ivy_ObjRefs( Ivy_Regular(pArgs[i]) ) > 0 )
+            pArgsRef[nArgsNew++] = pArgs[i];
+
+    // go through pairs
+    if ( nArgsNew >= 2 )
+    for ( i = 0; i < nArgsNew; i++ )
+    for ( k = i + 1; k < nArgsNew; k++ )
+        if ( pTemp = Ivy_TableLookup(Ivy_ObjCreateGhost(pArgsRef[i], pArgsRef[k], Type, IVY_INIT_NONE)) )
+            Counter++;
+//    printf( "%d", Counter );
+            
+    // go through pairs
+    if ( nArgsNew >= 2 )
+    for ( i = 0; i < nArgsNew; i++ )
+    for ( k = i + 1; k < nArgsNew; k++ )
+        if ( pTemp = Ivy_TableLookup(Ivy_ObjCreateGhost(pArgsRef[i], pArgsRef[k], Type, IVY_INIT_NONE)) )
+        {
+            nArgsNew = 0;
+            for ( m = 0; m < nArgs; m++ )
+                if ( pArgs[m] != pArgsRef[i] && pArgs[m] != pArgsRef[k] )
+                    pArgs[nArgsNew++] = pArgs[m];
+            pArgs[nArgsNew++] = pTemp;
+            assert( nArgsNew == nArgs - 1 );
+            return Ivy_Multi1( pArgs, nArgsNew, Type );
+        }
+    return Ivy_Multi_rec( pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Old code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi2( Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    assert( Type == IVY_AND || Type == IVY_EXOR );
+    assert( nArgs > 0 );
+    return Ivy_Multi_rec( pArgs, nArgs, Type );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyObj.c b/abc70930/src/aig/ivy/ivyObj.c
new file mode 100644
index 00000000..59dda19c
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyObj.c
@@ -0,0 +1,476 @@
+/**CFile****************************************************************
+
+  FileName    [ivyObj.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Adding/removing objects.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyObj.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Create the new node assuming it does not exist.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjCreatePi( Ivy_Man_t * p )
+{
+    return Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, NULL, NULL, IVY_PI, IVY_INIT_NONE) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Create the new node assuming it does not exist.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjCreatePo( Ivy_Man_t * p, Ivy_Obj_t * pDriver )
+{
+    return Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, pDriver, NULL, IVY_PO, IVY_INIT_NONE) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Create the new node assuming it does not exist.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjCreate( Ivy_Man_t * p, Ivy_Obj_t * pGhost )
+{
+    Ivy_Obj_t * pObj;
+    assert( !Ivy_IsComplement(pGhost) );
+    assert( Ivy_ObjIsGhost(pGhost) );
+    assert( Ivy_TableLookup(p, pGhost) == NULL );
+    // get memory for the new object
+    pObj = Ivy_ManFetchMemory( p );
+    assert( Ivy_ObjIsNone(pObj) );
+    pObj->Id = Vec_PtrSize(p->vObjs);
+    Vec_PtrPush( p->vObjs, pObj );
+    // add basic info (fanins, compls, type, init)
+    pObj->Type = pGhost->Type;
+    pObj->Init = pGhost->Init;
+    // add connections
+    Ivy_ObjConnect( p, pObj, pGhost->pFanin0, pGhost->pFanin1 );
+    // compute level
+    if ( Ivy_ObjIsNode(pObj) )
+        pObj->Level = Ivy_ObjLevelNew(pObj);
+    else if ( Ivy_ObjIsLatch(pObj) )
+        pObj->Level = 0;
+    else if ( Ivy_ObjIsOneFanin(pObj) )
+        pObj->Level = Ivy_ObjFanin0(pObj)->Level;
+    else if ( !Ivy_ObjIsPi(pObj) )
+        assert( 0 );
+    // create phase
+    if ( Ivy_ObjIsNode(pObj) )
+        pObj->fPhase = Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj)) & Ivy_ObjFaninPhase(Ivy_ObjChild1(pObj));
+    else if ( Ivy_ObjIsOneFanin(pObj) )
+        pObj->fPhase = Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj));
+    // set the fail TFO flag
+    if ( Ivy_ObjIsNode(pObj) )
+        pObj->fFailTfo = Ivy_ObjFanin0(pObj)->fFailTfo | Ivy_ObjFanin1(pObj)->fFailTfo;
+    // mark the fanins in a special way if the node is EXOR
+    if ( Ivy_ObjIsExor(pObj) )
+    {
+        Ivy_ObjFanin0(pObj)->fExFan = 1;
+        Ivy_ObjFanin1(pObj)->fExFan = 1;
+    }
+    // add PIs/POs to the arrays
+    if ( Ivy_ObjIsPi(pObj) )
+        Vec_PtrPush( p->vPis, pObj );
+    else if ( Ivy_ObjIsPo(pObj) )
+        Vec_PtrPush( p->vPos, pObj );
+//    else if ( Ivy_ObjIsBuf(pObj) )
+//        Vec_PtrPush( p->vBufs, pObj );
+    if ( p->vRequired && Vec_IntSize(p->vRequired) <= pObj->Id )
+        Vec_IntFillExtra( p->vRequired, 2 * Vec_IntSize(p->vRequired), 1000000 );
+    // update node counters of the manager
+    p->nObjs[Ivy_ObjType(pObj)]++;
+    p->nCreated++;
+
+//    printf( "Adding %sAIG node: ", p->pHaig==NULL? "H":" " );
+//    Ivy_ObjPrintVerbose( p, pObj, p->pHaig==NULL );
+//    printf( "\n" );
+
+    // if HAIG is defined, create a corresponding node
+    if ( p->pHaig )
+        Ivy_ManHaigCreateObj( p, pObj );
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Connect the object to the fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjConnect( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFan0, Ivy_Obj_t * pFan1 )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjIsPi(pObj) || Ivy_ObjIsOneFanin(pObj) || pFan1 != NULL );
+    // add the first fanin
+    pObj->pFanin0 = pFan0;
+    pObj->pFanin1 = pFan1;
+    // increment references of the fanins and add their fanouts
+    if ( Ivy_ObjFanin0(pObj) != NULL )
+    {
+        Ivy_ObjRefsInc( Ivy_ObjFanin0(pObj) );
+        if ( p->fFanout )
+            Ivy_ObjAddFanout( p, Ivy_ObjFanin0(pObj), pObj );
+    }
+    if ( Ivy_ObjFanin1(pObj) != NULL )
+    {
+        Ivy_ObjRefsInc( Ivy_ObjFanin1(pObj) );
+        if ( p->fFanout )
+            Ivy_ObjAddFanout( p, Ivy_ObjFanin1(pObj), pObj );
+    }
+    // add the node to the structural hash table
+    Ivy_TableInsert( p, pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Connect the object to the fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjDisconnect( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjIsPi(pObj) || Ivy_ObjIsOneFanin(pObj) || Ivy_ObjFanin1(pObj) != NULL );
+    // remove connections
+    if ( pObj->pFanin0 != NULL )
+    {
+        Ivy_ObjRefsDec(Ivy_ObjFanin0(pObj));
+        if ( p->fFanout )
+            Ivy_ObjDeleteFanout( p, Ivy_ObjFanin0(pObj), pObj );
+    }
+    if ( pObj->pFanin1 != NULL )
+    {
+        Ivy_ObjRefsDec(Ivy_ObjFanin1(pObj));
+        if ( p->fFanout )
+            Ivy_ObjDeleteFanout( p, Ivy_ObjFanin1(pObj), pObj );
+    }
+    assert( pObj->pNextFan0 == NULL );
+    assert( pObj->pNextFan1 == NULL );
+    assert( pObj->pPrevFan0 == NULL );
+    assert( pObj->pPrevFan1 == NULL );
+    // remove the node from the structural hash table
+    Ivy_TableDelete( p, pObj );
+    // add the first fanin
+    pObj->pFanin0 = NULL;
+    pObj->pFanin1 = NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces the first fanin of the node by the new fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjPatchFanin0( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFaninNew )
+{
+    Ivy_Obj_t * pFaninOld;
+    assert( !Ivy_IsComplement(pObj) );
+    pFaninOld = Ivy_ObjFanin0(pObj);
+    // decrement ref and remove fanout
+    Ivy_ObjRefsDec( pFaninOld );
+    if ( p->fFanout )
+        Ivy_ObjDeleteFanout( p, pFaninOld, pObj );
+    // update the fanin
+    pObj->pFanin0 = pFaninNew;
+    // increment ref and add fanout
+    Ivy_ObjRefsInc( Ivy_Regular(pFaninNew) );
+    if ( p->fFanout )
+        Ivy_ObjAddFanout( p, Ivy_Regular(pFaninNew), pObj );
+    // get rid of old fanin
+    if ( !Ivy_ObjIsPi(pFaninOld) && !Ivy_ObjIsConst1(pFaninOld) && Ivy_ObjRefs(pFaninOld) == 0 )
+        Ivy_ObjDelete_rec( p, pFaninOld, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop )
+{
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjRefs(pObj) == 0 || !fFreeTop );
+    // update node counters of the manager
+    p->nObjs[pObj->Type]--;
+    p->nDeleted++;
+    // remove connections
+    Ivy_ObjDisconnect( p, pObj );
+    // remove PIs/POs from the arrays
+    if ( Ivy_ObjIsPi(pObj) )
+        Vec_PtrRemove( p->vPis, pObj );
+    else if ( Ivy_ObjIsPo(pObj) )
+        Vec_PtrRemove( p->vPos, pObj );
+    else if ( p->fFanout && Ivy_ObjIsBuf(pObj) )
+        Vec_PtrRemove( p->vBufs, pObj );
+    // clean and recycle the entry
+    if ( fFreeTop )
+    {
+        // free the node
+        Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
+        Ivy_ManRecycleMemory( p, pObj );
+    }
+    else
+    {
+        int nRefsOld = pObj->nRefs;
+        Ivy_Obj_t * pFanout = pObj->pFanout;
+        Ivy_ObjClean( pObj );
+        pObj->pFanout = pFanout;
+        pObj->nRefs = nRefsOld;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the MFFC of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjDelete_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop )
+{
+    Ivy_Obj_t * pFanin0, * pFanin1;
+    assert( !Ivy_IsComplement(pObj) );
+    assert( !Ivy_ObjIsNone(pObj) );
+    if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsPi(pObj) )
+        return;
+    pFanin0 = Ivy_ObjFanin0(pObj);
+    pFanin1 = Ivy_ObjFanin1(pObj);
+    Ivy_ObjDelete( p, pObj, fFreeTop );
+    if ( pFanin0 && !Ivy_ObjIsNone(pFanin0) && Ivy_ObjRefs(pFanin0) == 0 )
+        Ivy_ObjDelete_rec( p, pFanin0, 1 );
+    if ( pFanin1 && !Ivy_ObjIsNone(pFanin1) && Ivy_ObjRefs(pFanin1) == 0 )
+        Ivy_ObjDelete_rec( p, pFanin1, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces one object by another.]
+
+  Description [Both objects are currently in the manager. The new object
+  (pObjNew) should be used instead of the old object (pObjOld). If the 
+  new object is complemented or used, the buffer is added.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjReplace( Ivy_Man_t * p, Ivy_Obj_t * pObjOld, Ivy_Obj_t * pObjNew, int fDeleteOld, int fFreeTop, int fUpdateLevel )
+{
+    int nRefsOld;//, clk;
+    // the object to be replaced cannot be complemented
+    assert( !Ivy_IsComplement(pObjOld) );
+    // the object to be replaced cannot be a terminal
+    assert( Ivy_ObjIsNone(pObjOld) || !Ivy_ObjIsPi(pObjOld) );
+    // the object to be used cannot be a PO or assert
+    assert( !Ivy_ObjIsBuf(Ivy_Regular(pObjNew)) );
+    // the object cannot be the same
+    assert( pObjOld != Ivy_Regular(pObjNew) );
+//printf( "Replacing %d by %d.\n", Ivy_Regular(pObjOld)->Id, Ivy_Regular(pObjNew)->Id );
+
+    // if HAIG is defined, create the choice node
+    if ( p->pHaig )
+    {
+//        if ( pObjOld->Id == 31 )
+//        {
+//            Ivy_ManShow( p, 0 );
+//            Ivy_ManShow( p->pHaig, 1 );
+//        }
+        Ivy_ManHaigCreateChoice( p, pObjOld, pObjNew );
+    }
+    // if the new object is complemented or already used, add the buffer
+    if ( Ivy_IsComplement(pObjNew) || Ivy_ObjIsLatch(pObjNew) || Ivy_ObjRefs(pObjNew) > 0 || Ivy_ObjIsPi(pObjNew) || Ivy_ObjIsConst1(pObjNew) )
+        pObjNew = Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, pObjNew, NULL, IVY_BUF, IVY_INIT_NONE) );
+    assert( !Ivy_IsComplement(pObjNew) );
+    if ( fUpdateLevel )
+    {
+//clk = clock();
+        // if the new node's arrival time is different, recursively update arrival time of the fanouts
+        if ( p->fFanout && !Ivy_ObjIsBuf(pObjNew) && pObjOld->Level != pObjNew->Level )
+        {
+            assert( Ivy_ObjIsNode(pObjOld) );
+            pObjOld->Level = pObjNew->Level;
+            Ivy_ObjUpdateLevel_rec( p, pObjOld );
+        }
+//p->time1 += clock() - clk;
+        // if the new node's required time has changed, recursively update required time of the fanins
+//clk = clock();
+        if ( p->vRequired )
+        {
+            int ReqNew = Vec_IntEntry(p->vRequired, pObjOld->Id);
+            if ( ReqNew < Vec_IntEntry(p->vRequired, pObjNew->Id) )
+            {
+                Vec_IntWriteEntry( p->vRequired, pObjNew->Id, ReqNew );
+                Ivy_ObjUpdateLevelR_rec( p, pObjNew, ReqNew );
+            }
+        }
+//p->time2 += clock() - clk;
+    }
+    // delete the old object
+    if ( fDeleteOld )
+        Ivy_ObjDelete_rec( p, pObjOld, fFreeTop );
+    // make sure object is not pointing to itself
+    assert( Ivy_ObjFanin0(pObjNew) == NULL || pObjOld != Ivy_ObjFanin0(pObjNew) );
+    assert( Ivy_ObjFanin1(pObjNew) == NULL || pObjOld != Ivy_ObjFanin1(pObjNew) );
+    // make sure the old node has no fanin fanout pointers
+    if ( p->fFanout )
+    {
+        assert( pObjOld->pFanout != NULL );
+        assert( pObjNew->pFanout == NULL );
+        pObjNew->pFanout = pObjOld->pFanout;
+    }
+    // transfer the old object
+    assert( Ivy_ObjRefs(pObjNew) == 0 );
+    nRefsOld = pObjOld->nRefs;  
+    Ivy_ObjOverwrite( pObjOld, pObjNew );
+    pObjOld->nRefs = nRefsOld;
+    // patch the fanout of the fanins 
+    if ( p->fFanout )
+    {
+        Ivy_ObjPatchFanout( p, Ivy_ObjFanin0(pObjOld), pObjNew, pObjOld );
+        if ( Ivy_ObjFanin1(pObjOld) )
+        Ivy_ObjPatchFanout( p, Ivy_ObjFanin1(pObjOld), pObjNew, pObjOld );
+    }
+    // update the hash table
+    Ivy_TableUpdate( p, pObjNew, pObjOld->Id );
+    // recycle the object that was taken over by pObjOld
+    Vec_PtrWriteEntry( p->vObjs, pObjNew->Id, NULL );
+    Ivy_ManRecycleMemory( p, pObjNew );
+    // if the new node is the buffer propagate it
+    if ( p->fFanout && Ivy_ObjIsBuf(pObjOld) )
+        Vec_PtrPush( p->vBufs, pObjOld );
+//    Ivy_ManCheckFanouts( p );
+//    printf( "\n" );
+/*
+    if ( p->pHaig )
+    {
+        int x;
+        Ivy_ManShow( p, 0, NULL );
+        Ivy_ManShow( p->pHaig, 1, NULL );
+        x = 0;
+    }
+*/
+//    if ( Ivy_ManCheckFanoutNums(p) )
+//    {
+//        int x = 0;
+//    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Fixes buffer fanins.]
+
+  Description [This situation happens because NodeReplace is a lazy
+  procedure, which does not propagate the change to the fanouts but
+  instead records the change in the form of a buf/inv node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_NodeFixBufferFanins( Ivy_Man_t * p, Ivy_Obj_t * pNode, int fUpdateLevel )
+{
+    Ivy_Obj_t * pFanReal0, * pFanReal1, * pResult;
+    if ( Ivy_ObjIsPo(pNode) )
+    {
+        if ( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) )
+            return;
+        pFanReal0 = Ivy_ObjReal( Ivy_ObjChild0(pNode) );
+        Ivy_ObjPatchFanin0( p, pNode, pFanReal0 );
+//        Ivy_ManCheckFanouts( p );
+        return;
+    }
+    if ( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) && !Ivy_ObjIsBuf(Ivy_ObjFanin1(pNode)) )
+        return;
+    // get the real fanins
+    pFanReal0 = Ivy_ObjReal( Ivy_ObjChild0(pNode) );
+    pFanReal1 = Ivy_ObjReal( Ivy_ObjChild1(pNode) );
+    // get the new node
+    if ( Ivy_ObjIsNode(pNode) )
+        pResult = Ivy_Oper( p, pFanReal0, pFanReal1, Ivy_ObjType(pNode) );
+    else if ( Ivy_ObjIsLatch(pNode) )
+        pResult = Ivy_Latch( p, pFanReal0, Ivy_ObjInit(pNode) );
+    else 
+        assert( 0 );
+
+//printf( "===== Replacing %d by %d.\n", pNode->Id, pResult->Id );
+//Ivy_ObjPrintVerbose( p, pNode, 0 );   printf( "\n" );
+//Ivy_ObjPrintVerbose( p, pResult, 0 ); printf( "\n" );
+
+    // perform the replacement
+    Ivy_ObjReplace( p, pNode, pResult, 1, 0, fUpdateLevel ); 
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyOper.c b/abc70930/src/aig/ivy/ivyOper.c
new file mode 100644
index 00000000..8115ce4f
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyOper.c
@@ -0,0 +1,293 @@
+/**CFile****************************************************************
+
+  FileName    [ivyOper.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [AIG operations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyOper.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// procedure to detect an EXOR gate
+static inline int Ivy_ObjIsExorType( Ivy_Obj_t * p0, Ivy_Obj_t * p1, Ivy_Obj_t ** ppFan0, Ivy_Obj_t ** ppFan1 )
+{
+    if ( !Ivy_IsComplement(p0) || !Ivy_IsComplement(p1) )
+        return 0;
+    p0 = Ivy_Regular(p0);
+    p1 = Ivy_Regular(p1);
+    if ( !Ivy_ObjIsAnd(p0) || !Ivy_ObjIsAnd(p1) )
+        return 0;
+    if ( Ivy_ObjFanin0(p0) != Ivy_ObjFanin0(p1) || Ivy_ObjFanin1(p0) != Ivy_ObjFanin1(p1) )
+        return 0;
+    if ( Ivy_ObjFaninC0(p0) == Ivy_ObjFaninC0(p1) || Ivy_ObjFaninC1(p0) == Ivy_ObjFaninC1(p1) )
+        return 0;
+    *ppFan0 = Ivy_ObjChild0(p0);
+    *ppFan1 = Ivy_ObjChild1(p0);
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Perform one operation.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Oper( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1, Ivy_Type_t Type )
+{
+    if ( Type == IVY_AND )
+        return Ivy_And( p, p0, p1 );
+    if ( Type == IVY_EXOR )
+        return Ivy_Exor( p, p0, p1 );
+    assert( 0 );
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_And( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 )
+{
+//    Ivy_Obj_t * pFan0, * pFan1;
+    // check trivial cases
+    if ( p0 == p1 )
+        return p0;
+    if ( p0 == Ivy_Not(p1) )
+        return Ivy_Not(p->pConst1);
+    if ( Ivy_Regular(p0) == p->pConst1 )
+        return p0 == p->pConst1 ? p1 : Ivy_Not(p->pConst1);
+    if ( Ivy_Regular(p1) == p->pConst1 )
+        return p1 == p->pConst1 ? p0 : Ivy_Not(p->pConst1);
+    // check if it can be an EXOR gate
+//    if ( Ivy_ObjIsExorType( p0, p1, &pFan0, &pFan1 ) )
+//        return Ivy_CanonExor( pFan0, pFan1 );
+    return Ivy_CanonAnd( p, p0, p1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description [The argument nodes can be complemented.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Exor( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 )
+{
+/*
+    // check trivial cases
+    if ( p0 == p1 )
+        return Ivy_Not(p->pConst1);
+    if ( p0 == Ivy_Not(p1) )
+        return p->pConst1;
+    if ( Ivy_Regular(p0) == p->pConst1 )
+        return Ivy_NotCond( p1, p0 == p->pConst1 );
+    if ( Ivy_Regular(p1) == p->pConst1 )
+        return Ivy_NotCond( p0, p1 == p->pConst1 );
+    // check the table
+    return Ivy_CanonExor( p, p0, p1 );
+*/
+    return Ivy_Or( p, Ivy_And(p, p0, Ivy_Not(p1)), Ivy_And(p, Ivy_Not(p0), p1) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements Boolean OR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Or( Ivy_Man_t * p, Ivy_Obj_t * p0, Ivy_Obj_t * p1 )
+{
+    return Ivy_Not( Ivy_And( p, Ivy_Not(p0), Ivy_Not(p1) ) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Mux( Ivy_Man_t * p, Ivy_Obj_t * pC, Ivy_Obj_t * p1, Ivy_Obj_t * p0 )
+{
+    Ivy_Obj_t * pTempA1, * pTempA2, * pTempB1, * pTempB2, * pTemp;
+    int Count0, Count1;
+    // consider trivial cases
+    if ( p0 == Ivy_Not(p1) )
+        return Ivy_Exor( p, pC, p0 );
+    // other cases can be added
+    // implement the first MUX (F = C * x1 + C' * x0)
+    pTempA1 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, pC,          p1, IVY_AND, IVY_INIT_NONE) );
+    pTempA2 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Not(pC), p0, IVY_AND, IVY_INIT_NONE) );
+    if ( pTempA1 && pTempA2 )
+    {
+        pTemp = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Not(pTempA1), Ivy_Not(pTempA2), IVY_AND, IVY_INIT_NONE) );
+        if ( pTemp ) return Ivy_Not(pTemp);
+    }
+    Count0 = (pTempA1 != NULL) + (pTempA2 != NULL);
+    // implement the second MUX (F' = C * x1' + C' * x0')
+    pTempB1 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, pC,          Ivy_Not(p1), IVY_AND, IVY_INIT_NONE) );
+    pTempB2 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Not(pC), Ivy_Not(p0), IVY_AND, IVY_INIT_NONE) );
+    if ( pTempB1 && pTempB2 )
+    {
+        pTemp = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Not(pTempB1), Ivy_Not(pTempB2), IVY_AND, IVY_INIT_NONE) );
+        if ( pTemp ) return pTemp;
+    }
+    Count1 = (pTempB1 != NULL) + (pTempB2 != NULL);
+    // compare and decide which one to implement
+    if ( Count0 >= Count1 )
+    {
+        pTempA1 = pTempA1? pTempA1 : Ivy_And(p, pC,          p1);
+        pTempA2 = pTempA2? pTempA2 : Ivy_And(p, Ivy_Not(pC), p0);
+        return Ivy_Or( p, pTempA1, pTempA2 );
+    }
+    pTempB1 = pTempB1? pTempB1 : Ivy_And(p, pC,          Ivy_Not(p1));
+    pTempB2 = pTempB2? pTempB2 : Ivy_And(p, Ivy_Not(pC), Ivy_Not(p0));
+    return Ivy_Not( Ivy_Or( p, pTempB1, pTempB2 ) );
+
+//    return Ivy_Or( Ivy_And(pC, p1), Ivy_And(Ivy_Not(pC), p0) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements ITE operation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Maj( Ivy_Man_t * p, Ivy_Obj_t * pA, Ivy_Obj_t * pB, Ivy_Obj_t * pC )
+{
+    return Ivy_Or( p, Ivy_Or(p, Ivy_And(p, pA, pB), Ivy_And(p, pA, pC)), Ivy_And(p, pB, pC) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Constructs the well-balanced tree of gates.]
+
+  Description [Disregards levels and possible logic sharing.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi_rec( Ivy_Man_t * p, Ivy_Obj_t ** ppObjs, int nObjs, Ivy_Type_t Type )
+{
+    Ivy_Obj_t * pObj1, * pObj2;
+    if ( nObjs == 1 )
+        return ppObjs[0];
+    pObj1 = Ivy_Multi_rec( p, ppObjs,           nObjs/2,         Type );
+    pObj2 = Ivy_Multi_rec( p, ppObjs + nObjs/2, nObjs - nObjs/2, Type );
+    return Ivy_Oper( p, pObj1, pObj2, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Old code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Multi( Ivy_Man_t * p, Ivy_Obj_t ** pArgs, int nArgs, Ivy_Type_t Type )
+{
+    assert( Type == IVY_AND || Type == IVY_EXOR );
+    assert( nArgs > 0 );
+    return Ivy_Multi_rec( p, pArgs, nArgs, Type );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Implements the miter.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Miter( Ivy_Man_t * p, Vec_Ptr_t * vPairs )
+{
+    int i;
+    assert( vPairs->nSize > 0 );
+    assert( vPairs->nSize % 2 == 0 );
+    // go through the cubes of the node's SOP
+    for ( i = 0; i < vPairs->nSize; i += 2 )
+        vPairs->pArray[i/2] = Ivy_Not( Ivy_Exor( p, vPairs->pArray[i], vPairs->pArray[i+1] ) );
+    vPairs->nSize = vPairs->nSize/2;
+    return Ivy_Not( Ivy_Multi_rec( p, (Ivy_Obj_t **)vPairs->pArray, vPairs->nSize, IVY_AND ) );
+}
+ 
+/**Function*************************************************************
+
+  Synopsis    [Performs canonicization step.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_Latch( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Init_t Init )
+{
+    return Ivy_CanonLatch( p, pObj, Init );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyResyn.c b/abc70930/src/aig/ivy/ivyResyn.c
new file mode 100644
index 00000000..f42d7464
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyResyn.c
@@ -0,0 +1,196 @@
+/**CFile****************************************************************
+
+  FileName    [ivyResyn.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [AIG rewriting script.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyResyn.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs several passes of rewriting on the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManResyn0( Ivy_Man_t * pMan, int fUpdateLevel, int fVerbose )
+{
+    int clk;
+    Ivy_Man_t * pTemp;
+
+if ( fVerbose ) { printf( "Original:\n" ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pMan, fUpdateLevel );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+//    Ivy_ManRewriteAlg( pMan, fUpdateLevel, 0 );
+clk = clock();
+    Ivy_ManRewritePre( pMan, fUpdateLevel, 0, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, fUpdateLevel );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+    return pMan;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs several passes of rewriting on the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManResyn( Ivy_Man_t * pMan, int fUpdateLevel, int fVerbose )
+{
+    int clk;
+    Ivy_Man_t * pTemp;
+
+if ( fVerbose ) { printf( "Original:\n" ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pMan, fUpdateLevel );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+//    Ivy_ManRewriteAlg( pMan, fUpdateLevel, 0 );
+clk = clock();
+    Ivy_ManRewritePre( pMan, fUpdateLevel, 0, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, fUpdateLevel );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+//    Ivy_ManRewriteAlg( pMan, fUpdateLevel, 1 );
+clk = clock();
+    Ivy_ManRewritePre( pMan, fUpdateLevel, 1, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, fUpdateLevel );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+//    Ivy_ManRewriteAlg( pMan, fUpdateLevel, 1 );
+clk = clock();
+    Ivy_ManRewritePre( pMan, fUpdateLevel, 1, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, fUpdateLevel );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+    return pMan;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs several passes of rewriting on the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Man_t * Ivy_ManRwsat( Ivy_Man_t * pMan, int fVerbose )
+{
+    int clk;
+    Ivy_Man_t * pTemp;
+
+if ( fVerbose ) { printf( "Original:\n" ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    Ivy_ManRewritePre( pMan, 0, 0, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, 0 );
+//    pMan = Ivy_ManDup( pTemp = pMan );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+/*
+clk = clock();
+    Ivy_ManRewritePre( pMan, 0, 0, 0 );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Rewrite", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+
+clk = clock();
+    pMan = Ivy_ManBalance( pTemp = pMan, 0 );
+    Ivy_ManStop( pTemp );
+if ( fVerbose ) { printf( "\n" ); }
+if ( fVerbose ) { PRT( "Balance", clock() - clk ); }
+if ( fVerbose ) Ivy_ManPrintStats( pMan );
+*/
+    return pMan;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyRwr.c b/abc70930/src/aig/ivy/ivyRwr.c
new file mode 100644
index 00000000..3f8720ba
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyRwr.c
@@ -0,0 +1,609 @@
+/**CFile****************************************************************
+
+  FileName    [ivyRwt.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Rewriting based on precomputation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyRwt.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+#include "deco.h"
+#include "rwt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static unsigned Ivy_NodeGetTruth( Ivy_Obj_t * pObj, int * pNums, int nNums );
+static int Ivy_NodeRewrite( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pNode, int fUpdateLevel, int fUseZeroCost );
+static Dec_Graph_t * Rwt_CutEvaluate( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pRoot, 
+    Vec_Ptr_t * vFaninsCur, int nNodesSaved, int LevelMax, int * pGainBest, unsigned uTruth );
+
+static int Ivy_GraphToNetworkCount( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int NodeMax, int LevelMax );
+static void Ivy_GraphUpdateNetwork( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int fUpdateLevel, int nGain );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Performs incremental rewriting of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManRewritePre( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost, int fVerbose )
+{
+    Rwt_Man_t * pManRwt;
+    Ivy_Obj_t * pNode;
+    int i, nNodes, nGain;
+    int clk, clkStart = clock();
+    // start the rewriting manager
+    pManRwt = Rwt_ManStart( 0 );
+    p->pData = pManRwt;
+    if ( pManRwt == NULL )
+        return 0; 
+    // create fanouts
+    if ( fUpdateLevel && p->fFanout == 0 )
+        Ivy_ManStartFanout( p );
+    // compute the reverse levels if level update is requested
+    if ( fUpdateLevel )
+        Ivy_ManRequiredLevels( p );
+    // set the number of levels
+//    p->nLevelMax = Ivy_ManLevels( p );
+    // resynthesize each node once
+    nNodes = Ivy_ManObjIdMax(p);
+    Ivy_ManForEachNode( p, pNode, i )
+    {
+        // fix the fanin buffer problem
+        Ivy_NodeFixBufferFanins( p, pNode, 1 );
+        if ( Ivy_ObjIsBuf(pNode) )
+            continue;
+        // stop if all nodes have been tried once
+        if ( i > nNodes )
+            break;
+        // for each cut, try to resynthesize it
+        nGain = Ivy_NodeRewrite( p, pManRwt, pNode, fUpdateLevel, fUseZeroCost );
+        if ( nGain > 0 || nGain == 0 && fUseZeroCost )
+        {
+            Dec_Graph_t * pGraph = Rwt_ManReadDecs(pManRwt);
+            int fCompl           = Rwt_ManReadCompl(pManRwt);
+/*
+            {
+                Ivy_Obj_t * pObj;
+                int i;
+                printf( "USING: (" );
+                Vec_PtrForEachEntry( Rwt_ManReadLeaves(pManRwt), pObj, i )
+                    printf( "%d ", Ivy_ObjFanoutNum(Ivy_Regular(pObj)) );
+                printf( ")   Gain = %d.\n", nGain );
+            }
+            if ( nGain > 0 )
+            { // print stats on the MFFC
+                extern void Ivy_NodeMffsConeSuppPrint( Ivy_Obj_t * pNode );
+                printf( "Node %6d : Gain = %4d  ", pNode->Id, nGain );
+                Ivy_NodeMffsConeSuppPrint( pNode );
+            }
+*/
+            // complement the FF if needed
+clk = clock();
+            if ( fCompl ) Dec_GraphComplement( pGraph );
+            Ivy_GraphUpdateNetwork( p, pNode, pGraph, fUpdateLevel, nGain );
+            if ( fCompl ) Dec_GraphComplement( pGraph );
+Rwt_ManAddTimeUpdate( pManRwt, clock() - clk );
+        }
+    }
+Rwt_ManAddTimeTotal( pManRwt, clock() - clkStart );
+    // print stats
+    if ( fVerbose )
+        Rwt_ManPrintStats( pManRwt );
+    // delete the managers
+    Rwt_ManStop( pManRwt );
+    p->pData = NULL;
+    // fix the levels
+    if ( fUpdateLevel )
+        Vec_IntFree( p->vRequired ), p->vRequired = NULL;
+    else
+        Ivy_ManResetLevels( p );
+    // check
+    if ( i = Ivy_ManCleanup(p) )
+        printf( "Cleanup after rewriting removed %d dangling nodes.\n", i );
+    if ( !Ivy_ManCheck(p) )
+        printf( "Ivy_ManRewritePre(): The check has failed.\n" );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs rewriting for one node.]
+
+  Description [This procedure considers all the cuts computed for the node
+  and tries to rewrite each of them using the "forest" of different AIG
+  structures precomputed and stored in the RWR manager. 
+  Determines the best rewriting and computes the gain in the number of AIG
+  nodes in the final network. In the end, p->vFanins contains information 
+  about the best cut that can be used for rewriting, while p->pGraph gives 
+  the decomposition dag (represented using decomposition graph data structure).
+  Returns gain in the number of nodes or -1 if node cannot be rewritten.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeRewrite( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pNode, int fUpdateLevel, int fUseZeroCost )
+{
+    int fVeryVerbose = 0;
+    Dec_Graph_t * pGraph;
+    Ivy_Store_t * pStore;
+    Ivy_Cut_t * pCut;
+    Ivy_Obj_t * pFanin;
+    unsigned uPhase, uTruthBest, uTruth;
+    char * pPerm;
+    int Required, nNodesSaved, nNodesSaveCur;
+    int i, c, GainCur, GainBest = -1;
+    int clk, clk2;
+
+    p->nNodesConsidered++;
+    // get the required times
+    Required = fUpdateLevel? Vec_IntEntry( pMan->vRequired, pNode->Id ) : 1000000;
+    // get the node's cuts
+clk = clock();
+    pStore = Ivy_NodeFindCutsAll( pMan, pNode, 5 );
+p->timeCut += clock() - clk;
+
+    // go through the cuts
+clk = clock();
+    for ( c = 1; c < pStore->nCuts; c++ )
+    {
+        pCut = pStore->pCuts + c;
+        // consider only 4-input cuts
+        if ( pCut->nSize != 4 )
+            continue;
+        // skip the cuts with buffers
+        for ( i = 0; i < (int)pCut->nSize; i++ )
+            if ( Ivy_ObjIsBuf( Ivy_ManObj(pMan, pCut->pArray[i]) ) )
+                break;
+        if ( i != pCut->nSize )
+        {
+            p->nCutsBad++;
+            continue;
+        }
+        p->nCutsGood++;
+        // get the fanin permutation
+clk2 = clock();
+        uTruth = 0xFFFF & Ivy_NodeGetTruth( pNode, pCut->pArray, pCut->nSize );  // truth table
+p->timeTruth += clock() - clk2;
+        pPerm = p->pPerms4[ p->pPerms[uTruth] ];
+        uPhase = p->pPhases[uTruth];
+        // collect fanins with the corresponding permutation/phase
+        Vec_PtrClear( p->vFaninsCur );
+        Vec_PtrFill( p->vFaninsCur, (int)pCut->nSize, 0 );
+        for ( i = 0; i < (int)pCut->nSize; i++ )
+        {
+            pFanin = Ivy_ManObj( pMan, pCut->pArray[pPerm[i]] );
+            assert( Ivy_ObjIsNode(pFanin) || Ivy_ObjIsCi(pFanin) );
+            pFanin = Ivy_NotCond(pFanin, ((uPhase & (1<<i)) > 0) );
+            Vec_PtrWriteEntry( p->vFaninsCur, i, pFanin );
+        }
+clk2 = clock();
+/*
+        printf( "Considering: (" );
+        Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+            printf( "%d ", Ivy_ObjFanoutNum(Ivy_Regular(pFanin)) );
+        printf( ")\n" );
+*/
+        // mark the fanin boundary 
+        Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+            Ivy_ObjRefsInc( Ivy_Regular(pFanin) );
+        // label MFFC with current ID
+        Ivy_ManIncrementTravId( pMan );
+        nNodesSaved = Ivy_ObjMffcLabel( pMan, pNode );
+        // unmark the fanin boundary
+        Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+            Ivy_ObjRefsDec( Ivy_Regular(pFanin) );
+p->timeMffc += clock() - clk2;
+
+        // evaluate the cut
+clk2 = clock();
+        pGraph = Rwt_CutEvaluate( pMan, p, pNode, p->vFaninsCur, nNodesSaved, Required, &GainCur, uTruth );
+p->timeEval += clock() - clk2;
+
+        // check if the cut is better than the current best one
+        if ( pGraph != NULL && GainBest < GainCur )
+        {
+            // save this form
+            nNodesSaveCur = nNodesSaved;
+            GainBest  = GainCur;
+            p->pGraph  = pGraph;
+            p->fCompl = ((uPhase & (1<<4)) > 0);
+            uTruthBest = uTruth;
+            // collect fanins in the
+            Vec_PtrClear( p->vFanins );
+            Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+                Vec_PtrPush( p->vFanins, pFanin );
+        }
+    }
+p->timeRes += clock() - clk;
+
+    if ( GainBest == -1 )
+        return -1;
+
+//    printf( "%d", nNodesSaveCur - GainBest );
+/*
+    if ( GainBest > 0 )
+    {
+        if ( Rwt_CutIsintean( pNode, p->vFanins ) )
+            printf( "b" );
+        else
+        {
+            printf( "Node %d : ", pNode->Id );
+            Vec_PtrForEachEntry( p->vFanins, pFanin, i )
+                printf( "%d ", Ivy_Regular(pFanin)->Id );
+            printf( "a" );
+        }
+    }
+*/
+/*
+    if ( GainBest > 0 )
+        if ( p->fCompl )
+            printf( "c" );
+        else
+            printf( "." );
+*/
+
+    // copy the leaves
+    Vec_PtrForEachEntry( p->vFanins, pFanin, i )
+        Dec_GraphNode(p->pGraph, i)->pFunc = pFanin;
+
+    p->nScores[p->pMap[uTruthBest]]++;
+    p->nNodesGained += GainBest;
+    if ( fUseZeroCost || GainBest > 0 )
+        p->nNodesRewritten++;
+
+    // report the progress
+    if ( fVeryVerbose && GainBest > 0 )
+    {
+        printf( "Node %6d :   ", Ivy_ObjId(pNode) );
+        printf( "Fanins = %d. ", p->vFanins->nSize );
+        printf( "Save = %d.  ", nNodesSaveCur );
+        printf( "Add = %d.  ",  nNodesSaveCur-GainBest );
+        printf( "GAIN = %d.  ", GainBest );
+        printf( "Cone = %d.  ", p->pGraph? Dec_GraphNodeNum(p->pGraph) : 0 );
+        printf( "Class = %d.  ", p->pMap[uTruthBest] );
+        printf( "\n" );
+    }
+    return GainBest;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_NodeGetTruth_rec( Ivy_Obj_t * pObj, int * pNums, int nNums )
+{
+    static unsigned uMasks[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    unsigned uTruth0, uTruth1;
+    int i;
+    for ( i = 0; i < nNums; i++ )
+        if ( pObj->Id == pNums[i] )
+            return uMasks[i];
+    assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj) );
+    uTruth0 = Ivy_NodeGetTruth_rec( Ivy_ObjFanin0(pObj), pNums, nNums );
+    if ( Ivy_ObjFaninC0(pObj) )
+        uTruth0 = ~uTruth0;
+    if ( Ivy_ObjIsBuf(pObj) )
+        return uTruth0;
+    uTruth1 = Ivy_NodeGetTruth_rec( Ivy_ObjFanin1(pObj), pNums, nNums );
+    if ( Ivy_ObjFaninC1(pObj) )
+        uTruth1 = ~uTruth1;
+    return uTruth0 & uTruth1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_NodeGetTruth( Ivy_Obj_t * pObj, int * pNums, int nNums )
+{
+    assert( nNums < 6 );
+    return Ivy_NodeGetTruth_rec( pObj, pNums, nNums );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluates the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Graph_t * Rwt_CutEvaluate( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pRoot, Vec_Ptr_t * vFaninsCur, int nNodesSaved, int LevelMax, int * pGainBest, unsigned uTruth )
+{
+    Vec_Ptr_t * vSubgraphs;
+    Dec_Graph_t * pGraphBest, * pGraphCur;
+    Rwt_Node_t * pNode, * pFanin;
+    int nNodesAdded, GainBest, i, k;
+    // find the matching class of subgraphs
+    vSubgraphs = Vec_VecEntry( p->vClasses, p->pMap[uTruth] );
+    p->nSubgraphs += vSubgraphs->nSize;
+    // determine the best subgraph
+    GainBest = -1;
+    Vec_PtrForEachEntry( vSubgraphs, pNode, i )
+    {
+        // get the current graph
+        pGraphCur = (Dec_Graph_t *)pNode->pNext;
+        // copy the leaves
+        Vec_PtrForEachEntry( vFaninsCur, pFanin, k )
+            Dec_GraphNode(pGraphCur, k)->pFunc = pFanin;
+        // detect how many unlabeled nodes will be reused
+        nNodesAdded = Ivy_GraphToNetworkCount( pMan, pRoot, pGraphCur, nNodesSaved, LevelMax );
+        if ( nNodesAdded == -1 )
+            continue;
+        assert( nNodesSaved >= nNodesAdded );
+        // count the gain at this node
+        if ( GainBest < nNodesSaved - nNodesAdded )
+        {
+            GainBest   = nNodesSaved - nNodesAdded;
+            pGraphBest = pGraphCur;
+        }
+    }
+    if ( GainBest == -1 )
+        return NULL;
+    *pGainBest = GainBest;
+    return pGraphBest;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of new nodes added when using this graph.]
+
+  Description [AIG nodes for the fanins should be assigned to pNode->pFunc 
+  of the leaves of the graph before calling this procedure. 
+  Returns -1 if the number of nodes and levels exceeded the given limit or 
+  the number of levels exceeded the maximum allowed level.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_GraphToNetworkCount( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int NodeMax, int LevelMax )
+{
+    Dec_Node_t * pNode, * pNode0, * pNode1;
+    Ivy_Obj_t * pAnd, * pAnd0, * pAnd1;
+    int i, Counter, LevelNew, LevelOld;
+    // check for constant function or a literal
+    if ( Dec_GraphIsConst(pGraph) || Dec_GraphIsVar(pGraph) )
+        return 0;
+    // set the levels of the leaves
+    Dec_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->Level = Ivy_Regular(pNode->pFunc)->Level;
+    // compute the AIG size after adding the internal nodes
+    Counter = 0;
+    Dec_GraphForEachNode( pGraph, pNode, i )
+    {
+        // get the children of this node
+        pNode0 = Dec_GraphNode( pGraph, pNode->eEdge0.Node );
+        pNode1 = Dec_GraphNode( pGraph, pNode->eEdge1.Node );
+        // get the AIG nodes corresponding to the children 
+        pAnd0 = pNode0->pFunc; 
+        pAnd1 = pNode1->pFunc; 
+        if ( pAnd0 && pAnd1 )
+        {
+            // if they are both present, find the resulting node
+            pAnd0 = Ivy_NotCond( pAnd0, pNode->eEdge0.fCompl );
+            pAnd1 = Ivy_NotCond( pAnd1, pNode->eEdge1.fCompl );
+            pAnd  = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, pAnd0, pAnd1, IVY_AND, IVY_INIT_NONE) );
+            // return -1 if the node is the same as the original root
+            if ( Ivy_Regular(pAnd) == pRoot )
+                return -1;
+        }
+        else
+            pAnd = NULL;
+        // count the number of added nodes
+        if ( pAnd == NULL || Ivy_ObjIsTravIdCurrent(p, Ivy_Regular(pAnd)) )
+        {
+            if ( ++Counter > NodeMax )
+                return -1;
+        }
+        // count the number of new levels
+        LevelNew = 1 + RWT_MAX( pNode0->Level, pNode1->Level );
+        if ( pAnd )
+        {
+            if ( Ivy_Regular(pAnd) == p->pConst1 )
+                LevelNew = 0;
+            else if ( Ivy_Regular(pAnd) == Ivy_Regular(pAnd0) )
+                LevelNew = (int)Ivy_Regular(pAnd0)->Level;
+            else if ( Ivy_Regular(pAnd) == Ivy_Regular(pAnd1) )
+                LevelNew = (int)Ivy_Regular(pAnd1)->Level;
+            LevelOld = (int)Ivy_Regular(pAnd)->Level;
+//            assert( LevelNew == LevelOld );
+        }
+        if ( LevelNew > LevelMax )
+            return -1;
+        pNode->pFunc = pAnd;
+        pNode->Level = LevelNew;
+    }
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms the decomposition graph into the AIG.]
+
+  Description [AIG nodes for the fanins should be assigned to pNode->pFunc
+  of the leaves of the graph before calling this procedure.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_GraphToNetwork( Ivy_Man_t * p, Dec_Graph_t * pGraph )
+{
+    Ivy_Obj_t * pAnd0, * pAnd1;
+    Dec_Node_t * pNode;
+    int i;
+    // check for constant function
+    if ( Dec_GraphIsConst(pGraph) )
+        return Ivy_NotCond( Ivy_ManConst1(p), Dec_GraphIsComplement(pGraph) );
+    // check for a literal
+    if ( Dec_GraphIsVar(pGraph) )
+        return Ivy_NotCond( Dec_GraphVar(pGraph)->pFunc, Dec_GraphIsComplement(pGraph) );
+    // build the AIG nodes corresponding to the AND gates of the graph
+    Dec_GraphForEachNode( pGraph, pNode, i )
+    {
+        pAnd0 = Ivy_NotCond( Dec_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        pAnd1 = Ivy_NotCond( Dec_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        pNode->pFunc = Ivy_And( p, pAnd0, pAnd1 );
+    }
+    // complement the result if necessary
+    return Ivy_NotCond( pNode->pFunc, Dec_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces MFFC of the node by the new factored form.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_GraphUpdateNetwork( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int fUpdateLevel, int nGain )
+{
+    Ivy_Obj_t * pRootNew;
+    int nNodesNew, nNodesOld, Required;
+    Required = fUpdateLevel? Vec_IntEntry( p->vRequired, pRoot->Id ) : 1000000;
+    nNodesOld = Ivy_ManNodeNum(p);
+    // create the new structure of nodes
+    pRootNew = Ivy_GraphToNetwork( p, pGraph );
+    assert( (int)Ivy_Regular(pRootNew)->Level <= Required );
+//    if ( Ivy_Regular(pRootNew)->Level == Required )
+//        printf( "Difference %d.\n", Ivy_Regular(pRootNew)->Level - Required );
+    // remove the old nodes
+//    Ivy_AigReplace( pMan->pManFunc, pRoot, pRootNew, fUpdateLevel );
+/*
+    if ( Ivy_IsComplement(pRootNew) )
+        printf( "c" );
+    else
+        printf( "d" );
+    if ( Ivy_ObjRefs(Ivy_Regular(pRootNew)) > 0 )
+        printf( "%d", Ivy_ObjRefs(Ivy_Regular(pRootNew)) );
+    printf( " " );
+*/
+    Ivy_ObjReplace( p, pRoot, pRootNew, 1, 0, 1 );
+    // compare the gains
+    nNodesNew = Ivy_ManNodeNum(p);
+    assert( nGain <= nNodesOld - nNodesNew );
+    // propagate the buffer
+    Ivy_ManPropagateBuffers( p, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces MFFC of the node by the new factored form.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_GraphUpdateNetwork3( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int fUpdateLevel, int nGain )
+{
+    Ivy_Obj_t * pRootNew, * pFanin;
+    int nNodesNew, nNodesOld, i, nRefsOld;
+    nNodesOld = Ivy_ManNodeNum(p);
+
+//printf( "Before = %d. ", Ivy_ManNodeNum(p) );
+    // mark the cut
+    Vec_PtrForEachEntry( ((Rwt_Man_t *)p->pData)->vFanins, pFanin, i )
+        Ivy_ObjRefsInc( Ivy_Regular(pFanin) );
+    // deref the old cone
+    nRefsOld = pRoot->nRefs;  
+    pRoot->nRefs = 0;
+    Ivy_ObjDelete_rec( p, pRoot, 0 );
+    pRoot->nRefs = nRefsOld;
+    // unmark the cut
+    Vec_PtrForEachEntry( ((Rwt_Man_t *)p->pData)->vFanins, pFanin, i )
+        Ivy_ObjRefsDec( Ivy_Regular(pFanin) );
+//printf( "Deref = %d. ", Ivy_ManNodeNum(p) );
+ 
+    // create the new structure of nodes
+    pRootNew = Ivy_GraphToNetwork( p, pGraph );
+//printf( "Create = %d. ", Ivy_ManNodeNum(p) );
+    // remove the old nodes
+//    Ivy_AigReplace( pMan->pManFunc, pRoot, pRootNew, fUpdateLevel );
+/*
+    if ( Ivy_IsComplement(pRootNew) )
+        printf( "c" );
+    else
+        printf( "d" );
+    if ( Ivy_ObjRefs(Ivy_Regular(pRootNew)) > 0 )
+        printf( "%d", Ivy_ObjRefs(Ivy_Regular(pRootNew)) );
+    printf( " " );
+*/
+    Ivy_ObjReplace( p, pRoot, pRootNew, 0, 0, 1 );
+//printf( "Replace = %d. ", Ivy_ManNodeNum(p) );
+
+    // delete remaining dangling nodes
+    Vec_PtrForEachEntry( ((Rwt_Man_t *)p->pData)->vFanins, pFanin, i )
+    {
+        pFanin = Ivy_Regular(pFanin);
+        if ( !Ivy_ObjIsNone(pFanin) && Ivy_ObjRefs(pFanin) == 0 )
+            Ivy_ObjDelete_rec( p, pFanin, 1 );
+    }
+//printf( "Deref = %d. ", Ivy_ManNodeNum(p) );
+//printf( "\n" );
+
+    // compare the gains
+    nNodesNew = Ivy_ManNodeNum(p);
+    assert( nGain <= nNodesOld - nNodesNew );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyRwrAlg.c b/abc70930/src/aig/ivy/ivyRwrAlg.c
new file mode 100644
index 00000000..fc48deb0
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyRwrAlg.c
@@ -0,0 +1,408 @@
+/**CFile****************************************************************
+
+  FileName    [ivyRwrAlg.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Algebraic AIG rewriting.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyRwrAlg.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static int Ivy_ManFindAlgCut( Ivy_Obj_t * pRoot, Vec_Ptr_t * vFront, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone );
+static Ivy_Obj_t * Ivy_NodeRewriteAlg( Ivy_Obj_t * pObj, Vec_Ptr_t * vFront, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone, Vec_Ptr_t * vSols, int LevelR, int fUseZeroCost );
+static int Ivy_NodeCountMffc( Ivy_Obj_t * pNode );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Algebraic AIG rewriting.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManRewriteAlg( Ivy_Man_t * p, int fUpdateLevel, int fUseZeroCost )
+{
+    Vec_Int_t * vRequired;
+    Vec_Ptr_t * vFront, * vLeaves, * vCone, * vSol;
+    Ivy_Obj_t * pObj, * pResult;
+    int i, RetValue, LevelR, nNodesOld;
+    int CountUsed, CountUndo;
+    vRequired = fUpdateLevel? Ivy_ManRequiredLevels( p ) : NULL;
+    vFront    = Vec_PtrAlloc( 100 );
+    vLeaves   = Vec_PtrAlloc( 100 );
+    vCone     = Vec_PtrAlloc( 100 );
+    vSol      = Vec_PtrAlloc( 100 );
+    // go through the nodes in the topological order
+    CountUsed = CountUndo = 0;
+    nNodesOld = Ivy_ManObjIdNext(p);
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        assert( !Ivy_ObjIsBuf(pObj) );
+        if ( i >= nNodesOld )
+            break;
+        // skip no-nodes and MUX roots
+        if ( !Ivy_ObjIsNode(pObj) || Ivy_ObjIsExor(pObj) || Ivy_ObjIsMuxType(pObj) )
+            continue;
+//        if ( pObj->Id > 297 ) // 296 --- 297 
+//            break;
+        if ( pObj->Id == 297 )
+        {
+            int x = 0;
+        }
+        // get the largest algebraic cut
+        RetValue = Ivy_ManFindAlgCut( pObj, vFront, vLeaves, vCone );
+        // the case of a trivial tree cut
+        if ( RetValue == 1 )
+            continue;
+        // the case of constant 0 cone
+        if ( RetValue == -1 )
+        {
+            Ivy_ObjReplace( pObj, Ivy_ManConst0(p), 1, 0, 1 ); 
+            continue;
+        }
+        assert( Vec_PtrSize(vLeaves) > 2 );
+        // get the required level for this node
+        LevelR = vRequired? Vec_IntEntry(vRequired, pObj->Id) : 1000000;
+        // create a new cone
+        pResult = Ivy_NodeRewriteAlg( pObj, vFront, vLeaves, vCone, vSol, LevelR, fUseZeroCost );
+        if ( pResult == NULL || pResult == pObj )
+            continue;
+        assert( Vec_PtrSize(vSol) == 1 || !Ivy_IsComplement(pResult) );
+        if ( Ivy_ObjLevel(Ivy_Regular(pResult)) > LevelR && Ivy_ObjRefs(Ivy_Regular(pResult)) == 0 )
+            Ivy_ObjDelete_rec(Ivy_Regular(pResult), 1), CountUndo++;
+        else
+            Ivy_ObjReplace( pObj, pResult, 1, 0, 1 ), CountUsed++; 
+    }
+    printf( "Used = %d. Undo = %d.\n", CountUsed, CountUndo );
+    Vec_PtrFree( vFront );
+    Vec_PtrFree( vCone );
+    Vec_PtrFree( vSol );
+    if ( vRequired ) Vec_IntFree( vRequired );
+    if ( i = Ivy_ManCleanup(p) )
+        printf( "Cleanup after rewriting removed %d dangling nodes.\n", i );
+    if ( !Ivy_ManCheck(p) )
+        printf( "Ivy_ManRewriteAlg(): The check has failed.\n" );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Analizes one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_NodeRewriteAlg( Ivy_Obj_t * pObj, Vec_Ptr_t * vFront, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone, Vec_Ptr_t * vSols, int LevelR, int fUseZeroCost )
+{
+    int fVerbose = 0;
+    Ivy_Obj_t * pTemp;
+    int k, Counter, nMffc, RetValue;
+
+    if ( fVerbose )
+    {
+        if ( Ivy_ObjIsExor(pObj) )
+            printf( "x " );
+        else
+            printf( "  " );
+    }
+
+/*       
+    printf( "%d ", Vec_PtrSize(vFront) );
+    printf( "( " );
+    Vec_PtrForEachEntry( vFront, pTemp, k )
+        printf( "%d ", Ivy_ObjRefs(Ivy_Regular(pTemp)) );
+    printf( ")\n" );
+*/
+    // collect nodes in the cone
+    if ( Ivy_ObjIsExor(pObj) )
+        Ivy_ManCollectCone( pObj, vFront, vCone );
+    else
+        Ivy_ManCollectCone( pObj, vLeaves, vCone );
+
+    // deref nodes in the cone
+    Vec_PtrForEachEntry( vCone, pTemp, k )
+    {
+        Ivy_ObjRefsDec( Ivy_ObjFanin0(pTemp) );
+        Ivy_ObjRefsDec( Ivy_ObjFanin1(pTemp) );
+        pTemp->fMarkB = 1;
+    }
+
+    // count the MFFC size
+    Vec_PtrForEachEntry( vFront, pTemp, k )
+        Ivy_Regular(pTemp)->fMarkA = 1;
+    nMffc = Ivy_NodeCountMffc( pObj );
+    Vec_PtrForEachEntry( vFront, pTemp, k )
+        Ivy_Regular(pTemp)->fMarkA = 0;
+
+    if ( fVerbose )
+    {
+    Counter = 0;
+    Vec_PtrForEachEntry( vCone, pTemp, k )
+        Counter += (Ivy_ObjRefs(pTemp) > 0);
+    printf( "%5d : Leaves = %2d. Cone = %2d. ConeRef = %2d.   Mffc = %d.   Lev = %d.  LevR = %d.\n", 
+        pObj->Id, Vec_PtrSize(vFront), Vec_PtrSize(vCone), Counter-1, nMffc, Ivy_ObjLevel(pObj), LevelR );
+    }
+/*
+    printf( "Leaves:" );
+    Vec_PtrForEachEntry( vLeaves, pTemp, k )
+        printf( " %d%s", Ivy_Regular(pTemp)->Id, Ivy_IsComplement(pTemp)? "\'" : "" );
+    printf( "\n" );
+    printf( "Cone:\n" );
+    Vec_PtrForEachEntry( vCone, pTemp, k )
+        printf( " %5d = %d%s %d%s\n", pTemp->Id,
+            Ivy_ObjFaninId0(pTemp), Ivy_ObjFaninC0(pTemp)? "\'" : "",
+            Ivy_ObjFaninId1(pTemp), Ivy_ObjFaninC1(pTemp)? "\'" : "" );
+*/
+
+    RetValue = Ivy_MultiPlus( vLeaves, vCone, Ivy_ObjType(pObj), nMffc + fUseZeroCost, vSols );
+
+    // ref nodes in the cone
+    Vec_PtrForEachEntry( vCone, pTemp, k )
+    {
+        Ivy_ObjRefsInc( Ivy_ObjFanin0(pTemp) );
+        Ivy_ObjRefsInc( Ivy_ObjFanin1(pTemp) );
+        pTemp->fMarkA = 0;
+        pTemp->fMarkB = 0;
+    }
+
+    if ( !RetValue )
+        return NULL;
+
+    if ( Vec_PtrSize( vSols ) == 1 )
+        return Vec_PtrEntry( vSols, 0 );
+    return Ivy_NodeBalanceBuildSuper( vSols, Ivy_ObjType(pObj), 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Comparison for node pointers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCountMffc_rec( Ivy_Obj_t * pNode )
+{
+    if ( Ivy_ObjRefs(pNode) > 0 || Ivy_ObjIsCi(pNode) || pNode->fMarkA )
+        return 0;
+    assert( pNode->fMarkB );
+    pNode->fMarkA = 1;
+//    printf( "%d ", pNode->Id );
+    if ( Ivy_ObjIsBuf(pNode) )
+        return Ivy_NodeCountMffc_rec( Ivy_ObjFanin0(pNode) );
+    return 1 + Ivy_NodeCountMffc_rec( Ivy_ObjFanin0(pNode) ) + Ivy_NodeCountMffc_rec( Ivy_ObjFanin1(pNode) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Comparison for node pointers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeCountMffc( Ivy_Obj_t * pNode )
+{
+    assert( pNode->fMarkB );
+    return 1 + Ivy_NodeCountMffc_rec( Ivy_ObjFanin0(pNode) ) + Ivy_NodeCountMffc_rec( Ivy_ObjFanin1(pNode) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Comparison for node pointers.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindAlgCutCompare( Ivy_Obj_t ** pp1, Ivy_Obj_t ** pp2 )
+{
+    if ( *pp1 < *pp2 )
+        return -1;
+    if ( *pp1 > *pp2 )
+        return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computing one algebraic cut.]
+
+  Description [Returns 1 if the tree-leaves of this node where traversed 
+  and found to have no external references (and have not been collected). 
+  Returns 0 if the tree-leaves have external references and are collected.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindAlgCut_rec( Ivy_Obj_t * pObj, Ivy_Type_t Type, Vec_Ptr_t * vFront, Vec_Ptr_t * vCone )
+{
+    int RetValue0, RetValue1;
+    Ivy_Obj_t * pObjR = Ivy_Regular(pObj);
+    assert( !Ivy_ObjIsBuf(pObjR) );
+    assert( Type != IVY_EXOR || !Ivy_IsComplement(pObj) );
+
+    // make sure the node is not visited twice in different polarities
+    if ( Ivy_IsComplement(pObj) )
+    { // if complemented, mark B
+        if ( pObjR->fMarkA )
+            return -1;
+        pObjR->fMarkB = 1;
+    }
+    else
+    { // if non-complicated, mark A
+        if ( pObjR->fMarkB )
+            return -1;
+        pObjR->fMarkA = 1;
+    }
+    Vec_PtrPush( vCone, pObjR );
+
+    // if the node is the end of the tree, return
+    if ( Ivy_IsComplement(pObj) || Ivy_ObjType(pObj) != Type )
+    {
+        if ( Ivy_ObjRefs(pObjR) == 1 )
+            return 1;
+        assert( Ivy_ObjRefs(pObjR) > 1 );
+        Vec_PtrPush( vFront, pObj );
+        return 0;
+    }
+
+    // branch on the node
+    assert( !Ivy_IsComplement(pObj) );
+    assert( Ivy_ObjIsNode(pObj) );
+    // what if buffer has more than one fanout???
+    RetValue0 = Ivy_ManFindAlgCut_rec( Ivy_ObjReal( Ivy_ObjChild0(pObj) ), Type, vFront, vCone );
+    RetValue1 = Ivy_ManFindAlgCut_rec( Ivy_ObjReal( Ivy_ObjChild1(pObj) ), Type, vFront, vCone );
+    if ( RetValue0 == -1 || RetValue1 == -1 )
+        return -1;
+
+    // the case when both have no external references
+    if ( RetValue0 && RetValue1 )
+    {
+        if ( Ivy_ObjRefs(pObj) == 1 )
+            return 1;
+        assert( Ivy_ObjRefs(pObj) > 1 );
+        Vec_PtrPush( vFront, pObj );
+        return 0;
+    }
+    // the case when one of them has external references
+    if ( RetValue0 )
+        Vec_PtrPush( vFront, Ivy_ObjReal( Ivy_ObjChild0(pObj) ) );
+    if ( RetValue1 )
+        Vec_PtrPush( vFront, Ivy_ObjReal( Ivy_ObjChild1(pObj) ) );
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computing one algebraic cut.]
+
+  Description [Algebraic cut stops when we hit (a) CI, (b) complemented edge,
+  (c) boundary of different gates. Returns 1 if this is a pure tree.
+  Returns -1 if the contant 0 is detected. Return 0 if the array can be used.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManFindAlgCut( Ivy_Obj_t * pRoot, Vec_Ptr_t * vFront, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vCone )
+{
+    Ivy_Obj_t * pObj, * pPrev;
+    int RetValue, i;
+    assert( !Ivy_IsComplement(pRoot) );
+    assert( Ivy_ObjIsNode(pRoot) );
+    // clear the frontier and collect the nodes
+    Vec_PtrClear( vCone );
+    Vec_PtrClear( vFront );
+    Vec_PtrClear( vLeaves );
+    RetValue = Ivy_ManFindAlgCut_rec( pRoot, Ivy_ObjType(pRoot), vFront, vCone );
+    // clean the marks
+    Vec_PtrForEachEntry( vCone, pObj, i )
+        pObj->fMarkA = pObj->fMarkB = 0;
+    // quit if the same node is found in both polarities
+    if ( RetValue == -1 )
+        return -1;
+    // return if the node is the root of a tree
+    if ( RetValue == 1 )
+        return 1;
+    // return if the cut is composed of two nodes
+    if ( Vec_PtrSize(vFront) <= 2 )
+        return 1;
+    // sort the entries in increasing order
+    Vec_PtrSort( vFront, Ivy_ManFindAlgCutCompare );
+    // remove duplicates from vFront and save the nodes in vLeaves
+    pPrev = Vec_PtrEntry(vFront, 0);
+    Vec_PtrPush( vLeaves, pPrev );
+    Vec_PtrForEachEntryStart( vFront, pObj, i, 1 )
+    {
+        // compare current entry and the previous entry
+        if ( pObj == pPrev )
+        {
+            if ( Ivy_ObjIsExor(pRoot) ) // A <+> A = 0
+            {
+                // vLeaves are no longer structural support of pRoot!!!
+                Vec_PtrPop(vLeaves);  
+                pPrev = Vec_PtrSize(vLeaves) == 0 ? NULL : Vec_PtrEntryLast(vLeaves);
+            }
+            continue;
+        }
+        if ( pObj == Ivy_Not(pPrev) )
+        {
+            assert( Ivy_ObjIsAnd(pRoot) );
+            return -1;
+        }
+        pPrev = pObj;
+        Vec_PtrPush( vLeaves, pObj );
+    }
+    if ( Vec_PtrSize(vLeaves) == 0 )
+        return -1;
+    if ( Vec_PtrSize(vLeaves) <= 2 )
+        return 1;
+    return 0;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivySeq.c b/abc70930/src/aig/ivy/ivySeq.c
new file mode 100644
index 00000000..0ee29fee
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivySeq.c
@@ -0,0 +1,1134 @@
+/**CFile****************************************************************
+
+  FileName    [ivySeq.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+ 
+  Revision    [$Id: ivySeq.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+#include "deco.h"
+#include "rwt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static int Ivy_NodeRewriteSeq( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pNode, int fUseZeroCost );
+static void Ivy_GraphPrepare( Dec_Graph_t * pGraph, Ivy_Cut_t * pCut, Vec_Ptr_t * vFanins, char * pPerm );
+static unsigned Ivy_CutGetTruth( Ivy_Man_t * p, Ivy_Obj_t * pObj, int * pNums, int nNums );
+static Dec_Graph_t * Rwt_CutEvaluateSeq( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pRoot, Ivy_Cut_t * pCut, char * pPerm, Vec_Ptr_t * vFaninsCur, int nNodesSaved, int * pGainBest, unsigned uTruth );
+static int Ivy_GraphToNetworkSeqCountSeq( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int NodeMax );
+static Ivy_Obj_t * Ivy_GraphToNetworkSeq( Ivy_Man_t * p, Dec_Graph_t * pGraph );
+static void Ivy_GraphUpdateNetworkSeq( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int nGain );
+static Ivy_Store_t * Ivy_CutComputeForNode( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves );
+
+static inline int Ivy_CutHashValue( int NodeId )  { return 1 << (NodeId % 31); }
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+//int nMoves;
+//int nMovesS;
+//int nClauses;
+//int timeInv;
+
+/**Function*************************************************************
+
+  Synopsis    [Performs incremental rewriting of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManRewriteSeq( Ivy_Man_t * p, int fUseZeroCost, int fVerbose )
+{ 
+    Rwt_Man_t * pManRwt;
+    Ivy_Obj_t * pNode;
+    int i, nNodes, nGain;
+    int clk, clkStart = clock();
+
+    // set the DC latch values
+    Ivy_ManForEachLatch( p, pNode, i )
+        pNode->Init = IVY_INIT_DC;
+    // start the rewriting manager
+    pManRwt = Rwt_ManStart( 0 );
+    p->pData = pManRwt;
+    if ( pManRwt == NULL )
+        return 0; 
+    // create fanouts
+    if ( p->fFanout == 0 )
+        Ivy_ManStartFanout( p );
+    // resynthesize each node once
+    nNodes = Ivy_ManObjIdMax(p);
+    Ivy_ManForEachNode( p, pNode, i )
+    {
+        assert( !Ivy_ObjIsBuf(pNode) );
+        assert( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) );
+        assert( !Ivy_ObjIsBuf(Ivy_ObjFanin1(pNode)) );
+        // fix the fanin buffer problem
+//        Ivy_NodeFixBufferFanins( p, pNode );
+//        if ( Ivy_ObjIsBuf(pNode) )
+//            continue;
+        // stop if all nodes have been tried once
+        if ( i > nNodes ) 
+            break;
+        // for each cut, try to resynthesize it
+        nGain = Ivy_NodeRewriteSeq( p, pManRwt, pNode, fUseZeroCost );
+        if ( nGain > 0 || nGain == 0 && fUseZeroCost )
+        {
+            Dec_Graph_t * pGraph = Rwt_ManReadDecs(pManRwt);
+            int fCompl           = Rwt_ManReadCompl(pManRwt);
+            // complement the FF if needed
+clk = clock();
+            if ( fCompl ) Dec_GraphComplement( pGraph );
+            Ivy_GraphUpdateNetworkSeq( p, pNode, pGraph, nGain );
+            if ( fCompl ) Dec_GraphComplement( pGraph );
+Rwt_ManAddTimeUpdate( pManRwt, clock() - clk );
+        }
+    }
+Rwt_ManAddTimeTotal( pManRwt, clock() - clkStart );
+    // print stats
+    if ( fVerbose )
+        Rwt_ManPrintStats( pManRwt );
+    // delete the managers
+    Rwt_ManStop( pManRwt );
+    p->pData = NULL;
+    // fix the levels
+    Ivy_ManResetLevels( p );
+//    if ( Ivy_ManCheckFanoutNums(p) )
+//        printf( "Ivy_ManRewritePre(): The check has failed.\n" );
+    // check
+    if ( !Ivy_ManCheck(p) )
+        printf( "Ivy_ManRewritePre(): The check has failed.\n" );
+    return 1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Performs rewriting for one node.]
+
+  Description [This procedure considers all the cuts computed for the node
+  and tries to rewrite each of them using the "forest" of different AIG
+  structures precomputed and stored in the RWR manager. 
+  Determines the best rewriting and computes the gain in the number of AIG
+  nodes in the final network. In the end, p->vFanins contains information 
+  about the best cut that can be used for rewriting, while p->pGraph gives 
+  the decomposition dag (represented using decomposition graph data structure).
+  Returns gain in the number of nodes or -1 if node cannot be rewritten.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_NodeRewriteSeq( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pNode, int fUseZeroCost )
+{
+    int fVeryVerbose = 0;
+    Dec_Graph_t * pGraph;
+    Ivy_Store_t * pStore;
+    Ivy_Cut_t * pCut;
+    Ivy_Obj_t * pFanin;//, * pFanout;
+    Vec_Ptr_t * vFanout;
+    unsigned uPhase, uTruthBest, uTruth;//, nNewClauses;
+    char * pPerm;
+    int nNodesSaved, nNodesSaveCur;
+    int i, c, GainCur, GainBest = -1;
+    int clk, clk2;//, clk3;
+
+    p->nNodesConsidered++;
+    // get the node's cuts
+clk = clock();
+    pStore = Ivy_CutComputeForNode( pMan, pNode, 5 );
+p->timeCut += clock() - clk;
+
+    // go through the cuts
+clk = clock();
+    vFanout = Vec_PtrAlloc( 100 );
+    for ( c = 1; c < pStore->nCuts; c++ )
+    {
+        pCut = pStore->pCuts + c;
+        // consider only 4-input cuts
+        if ( pCut->nSize != 4 )
+            continue;
+        // skip the cuts with buffers
+        for ( i = 0; i < (int)pCut->nSize; i++ )
+            if ( Ivy_ObjIsBuf( Ivy_ManObj(pMan, Ivy_LeafId(pCut->pArray[i])) ) )
+                break;
+        if ( i != pCut->nSize )
+        {
+            p->nCutsBad++;
+            continue;
+        }
+        p->nCutsGood++;
+        // get the fanin permutation
+clk2 = clock();
+        uTruth = 0xFFFF & Ivy_CutGetTruth( pMan, pNode, pCut->pArray, pCut->nSize );  // truth table
+p->timeTruth += clock() - clk2;
+        pPerm = p->pPerms4[ p->pPerms[uTruth] ];
+        uPhase = p->pPhases[uTruth];
+        // collect fanins with the corresponding permutation/phase
+        Vec_PtrClear( p->vFaninsCur );
+        Vec_PtrFill( p->vFaninsCur, (int)pCut->nSize, 0 );
+        for ( i = 0; i < (int)pCut->nSize; i++ )
+        {
+            pFanin = Ivy_ManObj( pMan, Ivy_LeafId( pCut->pArray[pPerm[i]] ) );
+            assert( Ivy_ObjIsNode(pFanin) || Ivy_ObjIsCi(pFanin) || Ivy_ObjIsConst1(pFanin) );
+            pFanin = Ivy_NotCond(pFanin, ((uPhase & (1<<i)) > 0) );
+            Vec_PtrWriteEntry( p->vFaninsCur, i, pFanin );
+        }
+clk2 = clock();
+        // mark the fanin boundary 
+        Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+            Ivy_ObjRefsInc( Ivy_Regular(pFanin) );
+        // label MFFC with current ID
+        Ivy_ManIncrementTravId( pMan );
+        nNodesSaved = Ivy_ObjMffcLabel( pMan, pNode );
+        // label fanouts with the current ID
+//        Ivy_ObjForEachFanout( pMan, pNode, vFanout, pFanout, i )
+//            Ivy_ObjSetTravIdCurrent( pMan, pFanout );
+        // unmark the fanin boundary
+        Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+            Ivy_ObjRefsDec( Ivy_Regular(pFanin) );
+p->timeMffc += clock() - clk2;
+
+        // evaluate the cut
+clk2 = clock();
+        pGraph = Rwt_CutEvaluateSeq( pMan, p, pNode, pCut, pPerm, p->vFaninsCur, nNodesSaved, &GainCur, uTruth );
+p->timeEval += clock() - clk2;
+
+
+        // check if the cut is better than the current best one
+        if ( pGraph != NULL && GainBest < GainCur )
+        {
+            // save this form
+            nNodesSaveCur = nNodesSaved;
+            GainBest   = GainCur;
+            p->pGraph  = pGraph;
+            p->pCut    = pCut;
+            p->pPerm   = pPerm;
+            p->fCompl  = ((uPhase & (1<<4)) > 0);
+            uTruthBest = uTruth;
+            // collect fanins in the
+            Vec_PtrClear( p->vFanins );
+            Vec_PtrForEachEntry( p->vFaninsCur, pFanin, i )
+                Vec_PtrPush( p->vFanins, pFanin );
+        }
+    }
+    Vec_PtrFree( vFanout );
+p->timeRes += clock() - clk;
+
+    if ( GainBest == -1 )
+        return -1;
+/*
+    {
+    Ivy_Cut_t * pCut = p->pCut;
+    printf( "Node %5d. Using cut : {", Ivy_ObjId(pNode) );
+    for ( i = 0; i < pCut->nSize; i++ )
+        printf( " %d(%d)", Ivy_LeafId(pCut->pArray[i]), Ivy_LeafLat(pCut->pArray[i]) );
+    printf( " }\n" );
+    }
+*/
+
+//clk3 = clock();
+//nNewClauses = Ivy_CutTruthPrint( pMan, p->pCut, uTruth );
+//timeInv += clock() - clk;
+
+//    nClauses += nNewClauses;
+//    nMoves++;
+//    if ( nNewClauses > 0 )
+//        nMovesS++;
+
+    // copy the leaves
+    Ivy_GraphPrepare( p->pGraph, p->pCut, p->vFanins, p->pPerm );
+
+    p->nScores[p->pMap[uTruthBest]]++;
+    p->nNodesGained += GainBest;
+    if ( fUseZeroCost || GainBest > 0 )
+        p->nNodesRewritten++;
+
+/*
+    if ( GainBest > 0 )
+    {
+        Ivy_Cut_t * pCut = p->pCut;
+        printf( "Node %5d. Using cut : {", Ivy_ObjId(pNode) );
+        for ( i = 0; i < pCut->nSize; i++ )
+            printf( " %5d(%2d)", Ivy_LeafId(pCut->pArray[i]), Ivy_LeafLat(pCut->pArray[i]) );
+        printf( " }\n" );
+    }
+*/
+
+    // report the progress
+    if ( fVeryVerbose && GainBest > 0 )
+    {
+        printf( "Node %6d :   ", Ivy_ObjId(pNode) );
+        printf( "Fanins = %d. ", p->vFanins->nSize );
+        printf( "Save = %d.  ", nNodesSaveCur );
+        printf( "Add = %d.  ",  nNodesSaveCur-GainBest );
+        printf( "GAIN = %d.  ", GainBest );
+        printf( "Cone = %d.  ", p->pGraph? Dec_GraphNodeNum(p->pGraph) : 0 );
+        printf( "Class = %d.  ", p->pMap[uTruthBest] );
+        printf( "\n" );
+    }
+    return GainBest;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Evaluates the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Graph_t * Rwt_CutEvaluateSeq( Ivy_Man_t * pMan, Rwt_Man_t * p, Ivy_Obj_t * pRoot, Ivy_Cut_t * pCut, char * pPerm, Vec_Ptr_t * vFaninsCur, int nNodesSaved, int * pGainBest, unsigned uTruth )
+{
+    Vec_Ptr_t * vSubgraphs;
+    Dec_Graph_t * pGraphBest, * pGraphCur;
+    Rwt_Node_t * pNode;
+    int nNodesAdded, GainBest, i;
+    // find the matching class of subgraphs
+    vSubgraphs = Vec_VecEntry( p->vClasses, p->pMap[uTruth] );
+    p->nSubgraphs += vSubgraphs->nSize;
+    // determine the best subgraph
+    GainBest = -1;
+    Vec_PtrForEachEntry( vSubgraphs, pNode, i )
+    {
+        // get the current graph
+        pGraphCur = (Dec_Graph_t *)pNode->pNext;
+
+//        if ( pRoot->Id == 8648 )
+//        Dec_GraphPrint( stdout, pGraphCur, NULL, NULL );
+        // copy the leaves
+//        Vec_PtrForEachEntry( vFaninsCur, pFanin, k )
+//            Dec_GraphNode(pGraphCur, k)->pFunc = pFanin;
+        Ivy_GraphPrepare( pGraphCur, pCut, vFaninsCur, pPerm );
+
+        // detect how many unlabeled nodes will be reused
+        nNodesAdded = Ivy_GraphToNetworkSeqCountSeq( pMan, pRoot, pGraphCur, nNodesSaved );
+        if ( nNodesAdded == -1 )
+            continue;
+        assert( nNodesSaved >= nNodesAdded );
+        // count the gain at this node
+        if ( GainBest < nNodesSaved - nNodesAdded )
+        {
+            GainBest   = nNodesSaved - nNodesAdded;
+            pGraphBest = pGraphCur;
+        }
+    }
+    if ( GainBest == -1 )
+        return NULL;
+    *pGainBest = GainBest;
+    return pGraphBest;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_GraphPrepare( Dec_Graph_t * pGraph, Ivy_Cut_t * pCut, Vec_Ptr_t * vFanins, char * pPerm )
+{
+    Dec_Node_t * pNode, * pNode0, * pNode1;
+    int i;
+    assert( Dec_GraphLeaveNum(pGraph) == pCut->nSize );
+    assert( Vec_PtrSize(vFanins) == pCut->nSize );
+    // label the leaves with latch numbers
+    Dec_GraphForEachLeaf( pGraph, pNode, i )
+    {
+        pNode->pFunc = Vec_PtrEntry( vFanins, i );
+        pNode->nLat2 = Ivy_LeafLat( pCut->pArray[pPerm[i]] );
+    }
+    // propagate latches through the nodes
+    Dec_GraphForEachNode( pGraph, pNode, i )
+    {
+        // get the children of this node
+        pNode0 = Dec_GraphNode( pGraph, pNode->eEdge0.Node );
+        pNode1 = Dec_GraphNode( pGraph, pNode->eEdge1.Node );
+        // distribute the latches
+        pNode->nLat2 = IVY_MIN( pNode0->nLat2, pNode1->nLat2 );
+        pNode->nLat0 = pNode0->nLat2 - pNode->nLat2;
+        pNode->nLat1 = pNode1->nLat2 - pNode->nLat2;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of new nodes added when using this graph.]
+
+  Description [AIG nodes for the fanins should be assigned to pNode->pFunc 
+  of the leaves of the graph before calling this procedure. 
+  Returns -1 if the number of nodes and levels exceeded the given limit or 
+  the number of levels exceeded the maximum allowed level.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_GraphToNetworkSeqCountSeq( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int NodeMax )
+{
+    Dec_Node_t * pNode, * pNode0, * pNode1;
+    Ivy_Obj_t * pAnd, * pAnd0, * pAnd1;
+    int i, k, Counter, fCompl;
+    // check for constant function or a literal
+    if ( Dec_GraphIsConst(pGraph) || Dec_GraphIsVar(pGraph) )
+        return 0;
+    // compute the AIG size after adding the internal nodes
+    Counter = 0;
+    Dec_GraphForEachNode( pGraph, pNode, i )
+    {
+        // get the children of this node
+        pNode0 = Dec_GraphNode( pGraph, pNode->eEdge0.Node );
+        pNode1 = Dec_GraphNode( pGraph, pNode->eEdge1.Node );
+        // get the AIG nodes corresponding to the children 
+        pAnd0 = pNode0->pFunc; 
+        pAnd1 = pNode1->pFunc; 
+        // skip the latches
+        for ( k = 0; pAnd0 && k < (int)pNode->nLat0; k++ )
+        {
+            fCompl = Ivy_IsComplement(pAnd0);
+            pAnd0 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Regular(pAnd0), NULL, IVY_LATCH, IVY_INIT_DC) );
+            if ( pAnd0 )
+                pAnd0 = Ivy_NotCond( pAnd0, fCompl );
+        }
+        for ( k = 0; pAnd1 && k < (int)pNode->nLat1; k++ )
+        {
+            fCompl = Ivy_IsComplement(pAnd1);
+            pAnd1 = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, Ivy_Regular(pAnd1), NULL, IVY_LATCH, IVY_INIT_DC) );
+            if ( pAnd1 )
+                pAnd1 = Ivy_NotCond( pAnd1, fCompl );
+        }
+        // get the new node
+        if ( pAnd0 && pAnd1 )
+        {
+            // if they are both present, find the resulting node
+            pAnd0 = Ivy_NotCond( pAnd0, pNode->eEdge0.fCompl );
+            pAnd1 = Ivy_NotCond( pAnd1, pNode->eEdge1.fCompl );
+            assert( !Ivy_ObjIsLatch(Ivy_Regular(pAnd0)) || !Ivy_ObjIsLatch(Ivy_Regular(pAnd1)) );
+            if ( Ivy_Regular(pAnd0) == Ivy_Regular(pAnd1) || Ivy_ObjIsConst1(Ivy_Regular(pAnd0)) || Ivy_ObjIsConst1(Ivy_Regular(pAnd1)) )
+                pAnd = Ivy_And( p, pAnd0, pAnd1 );
+            else
+                pAnd = Ivy_TableLookup( p, Ivy_ObjCreateGhost(p, pAnd0, pAnd1, IVY_AND, IVY_INIT_NONE) );
+            // return -1 if the node is the same as the original root
+            if ( Ivy_Regular(pAnd) == pRoot )
+                return -1;
+        }
+        else
+            pAnd = NULL;
+        // count the number of added nodes
+        if ( pAnd == NULL || Ivy_ObjIsTravIdCurrent(p, Ivy_Regular(pAnd)) )
+        {
+            if ( ++Counter > NodeMax )
+                return -1;
+        }
+        pNode->pFunc = pAnd;
+    }
+    return Counter;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms the decomposition graph into the AIG.]
+
+  Description [AIG nodes for the fanins should be assigned to pNode->pFunc
+  of the leaves of the graph before calling this procedure.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_GraphToNetworkSeq( Ivy_Man_t * p, Dec_Graph_t * pGraph )
+{
+    Ivy_Obj_t * pAnd0, * pAnd1;
+    Dec_Node_t * pNode;
+    int i, k;
+    // check for constant function
+    if ( Dec_GraphIsConst(pGraph) )
+        return Ivy_NotCond( Ivy_ManConst1(p), Dec_GraphIsComplement(pGraph) );
+    // check for a literal
+    if ( Dec_GraphIsVar(pGraph) )
+    {
+        // get the variable node
+        pNode = Dec_GraphVar(pGraph);
+        // add the remaining latches
+        for ( k = 0; k < (int)pNode->nLat2; k++ )
+            pNode->pFunc = Ivy_Latch( p, pNode->pFunc, IVY_INIT_DC );
+        return Ivy_NotCond( pNode->pFunc, Dec_GraphIsComplement(pGraph) );
+    }
+    // build the AIG nodes corresponding to the AND gates of the graph
+    Dec_GraphForEachNode( pGraph, pNode, i )
+    {
+        pAnd0 = Ivy_NotCond( Dec_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        pAnd1 = Ivy_NotCond( Dec_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        // add the latches
+        for ( k = 0; k < (int)pNode->nLat0; k++ )
+            pAnd0 = Ivy_Latch( p, pAnd0, IVY_INIT_DC );
+        for ( k = 0; k < (int)pNode->nLat1; k++ )
+            pAnd1 = Ivy_Latch( p, pAnd1, IVY_INIT_DC );
+        // create the node
+        pNode->pFunc = Ivy_And( p, pAnd0, pAnd1 );
+    }
+    // add the remaining latches
+    for ( k = 0; k < (int)pNode->nLat2; k++ )
+        pNode->pFunc = Ivy_Latch( p, pNode->pFunc, IVY_INIT_DC );
+    // complement the result if necessary
+    return Ivy_NotCond( pNode->pFunc, Dec_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Replaces MFFC of the node by the new factored form.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_GraphUpdateNetworkSeq( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Dec_Graph_t * pGraph, int nGain )
+{
+    Ivy_Obj_t * pRootNew;
+    int nNodesNew, nNodesOld;
+    nNodesOld = Ivy_ManNodeNum(p);
+    // create the new structure of nodes
+    pRootNew = Ivy_GraphToNetworkSeq( p, pGraph );
+    Ivy_ObjReplace( p, pRoot, pRootNew, 1, 0, 0 );
+    // compare the gains
+    nNodesNew = Ivy_ManNodeNum(p);
+    assert( nGain <= nNodesOld - nNodesNew );
+    // propagate the buffer
+    Ivy_ManPropagateBuffers( p, 0 );
+}
+
+
+
+
+
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_CutGetTruth_rec( Ivy_Man_t * p, int Leaf, int * pNums, int nNums )
+{
+    static unsigned uMasks[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    unsigned uTruth0, uTruth1;
+    Ivy_Obj_t * pObj;
+    int i;
+    for ( i = 0; i < nNums; i++ )
+        if ( Leaf == pNums[i] )
+            return uMasks[i];
+    pObj = Ivy_ManObj( p, Ivy_LeafId(Leaf) );
+    if ( Ivy_ObjIsLatch(pObj) )
+    {
+        assert( !Ivy_ObjFaninC0(pObj) );
+        Leaf = Ivy_LeafCreate( Ivy_ObjFaninId0(pObj), Ivy_LeafLat(Leaf) + 1 );
+        return Ivy_CutGetTruth_rec( p, Leaf, pNums, nNums );
+    }
+    assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj) );
+    Leaf = Ivy_LeafCreate( Ivy_ObjFaninId0(pObj), Ivy_LeafLat(Leaf) );
+    uTruth0 = Ivy_CutGetTruth_rec( p, Leaf, pNums, nNums );
+    if ( Ivy_ObjFaninC0(pObj) )
+        uTruth0 = ~uTruth0;
+    if ( Ivy_ObjIsBuf(pObj) )
+        return uTruth0;
+    Leaf = Ivy_LeafCreate( Ivy_ObjFaninId1(pObj), Ivy_LeafLat(Leaf) );
+    uTruth1 = Ivy_CutGetTruth_rec( p, Leaf, pNums, nNums );
+    if ( Ivy_ObjFaninC1(pObj) )
+        uTruth1 = ~uTruth1;
+    return uTruth0 & uTruth1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Ivy_CutGetTruth( Ivy_Man_t * p, Ivy_Obj_t * pObj, int * pNums, int nNums )
+{
+    assert( Ivy_ObjIsNode(pObj) );
+    assert( nNums < 6 );
+    return Ivy_CutGetTruth_rec( p, Ivy_LeafCreate(pObj->Id, 0), pNums, nNums );
+}
+
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the cut can be constructed; 0 otherwise.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutPrescreen( Ivy_Cut_t * pCut, int Id0, int Id1 )
+{
+    int i;
+    if ( pCut->nSize < pCut->nSizeMax )
+        return 1;
+    for ( i = 0; i < pCut->nSize; i++ )
+        if ( pCut->pArray[i] == Id0 || pCut->pArray[i] == Id1 )
+            return 1;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives new cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutDeriveNew2( Ivy_Cut_t * pCut, Ivy_Cut_t * pCutNew, int IdOld, int IdNew0, int IdNew1 )
+{
+    unsigned uHash = 0;
+    int i, k;
+    assert( pCut->nSize > 0 );
+    assert( IdNew0 < IdNew1 );
+    for ( i = k = 0; i < pCut->nSize; i++ )
+    {
+        if ( pCut->pArray[i] == IdOld )
+            continue;
+        if ( IdNew0 >= 0 )
+        {
+            if ( IdNew0 <= pCut->pArray[i] )
+            {
+                if ( IdNew0 < pCut->pArray[i] )
+                {
+                    if ( k == pCut->nSizeMax )
+                        return 0;
+                    pCutNew->pArray[ k++ ] = IdNew0;
+                    uHash |= Ivy_CutHashValue( IdNew0 );
+                }
+                IdNew0 = -1;
+            }
+        }
+        if ( IdNew1 >= 0 )
+        {
+            if ( IdNew1 <= pCut->pArray[i] )
+            {
+                if ( IdNew1 < pCut->pArray[i] )
+                {
+                    if ( k == pCut->nSizeMax )
+                        return 0;
+                    pCutNew->pArray[ k++ ] = IdNew1;
+                    uHash |= Ivy_CutHashValue( IdNew1 );
+                }
+                IdNew1 = -1;
+            }
+        }
+        if ( k == pCut->nSizeMax )
+            return 0;
+        pCutNew->pArray[ k++ ] = pCut->pArray[i];
+        uHash |= Ivy_CutHashValue( pCut->pArray[i] );
+    }
+    if ( IdNew0 >= 0 )
+    {
+        if ( k == pCut->nSizeMax )
+            return 0;
+        pCutNew->pArray[ k++ ] = IdNew0;
+        uHash |= Ivy_CutHashValue( IdNew0 );
+    }
+    if ( IdNew1 >= 0 )
+    {
+        if ( k == pCut->nSizeMax )
+            return 0;
+        pCutNew->pArray[ k++ ] = IdNew1;
+        uHash |= Ivy_CutHashValue( IdNew1 );
+    }
+    pCutNew->nSize = k;
+    pCutNew->uHash = uHash;
+    assert( pCutNew->nSize <= pCut->nSizeMax );
+    for ( i = 1; i < pCutNew->nSize; i++ )
+        assert( pCutNew->pArray[i-1] < pCutNew->pArray[i] );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives new cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutDeriveNew( Ivy_Cut_t * pCut, Ivy_Cut_t * pCutNew, int IdOld, int IdNew0, int IdNew1 )
+{
+    unsigned uHash = 0;
+    int i, k; 
+    assert( pCut->nSize > 0 );
+    assert( IdNew0 < IdNew1 );
+    for ( i = k = 0; i < pCut->nSize; i++ )
+    {
+        if ( pCut->pArray[i] == IdOld )
+            continue;
+        if ( IdNew0 <= pCut->pArray[i] )
+        {
+            if ( IdNew0 < pCut->pArray[i] )
+            {
+                pCutNew->pArray[ k++ ] = IdNew0;
+                uHash |= Ivy_CutHashValue( IdNew0 );
+            }
+            IdNew0 = 0x7FFFFFFF;
+        }
+        if ( IdNew1 <= pCut->pArray[i] )
+        {
+            if ( IdNew1 < pCut->pArray[i] )
+            {
+                pCutNew->pArray[ k++ ] = IdNew1;
+                uHash |= Ivy_CutHashValue( IdNew1 );
+            }
+            IdNew1 = 0x7FFFFFFF;
+        }
+        pCutNew->pArray[ k++ ] = pCut->pArray[i];
+        uHash |= Ivy_CutHashValue( pCut->pArray[i] );
+    }
+    if ( IdNew0 < 0x7FFFFFFF )
+    {
+        pCutNew->pArray[ k++ ] = IdNew0;
+        uHash |= Ivy_CutHashValue( IdNew0 );
+    }
+    if ( IdNew1 < 0x7FFFFFFF )
+    {
+        pCutNew->pArray[ k++ ] = IdNew1;
+        uHash |= Ivy_CutHashValue( IdNew1 );
+    }
+    pCutNew->nSize = k;
+    pCutNew->uHash = uHash;
+    assert( pCutNew->nSize <= pCut->nSizeMax );
+//    for ( i = 1; i < pCutNew->nSize; i++ )
+//        assert( pCutNew->pArray[i-1] < pCutNew->pArray[i] );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find the hash value of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Ivy_NodeCutHash( Ivy_Cut_t * pCut )
+{
+    int i;
+    pCut->uHash = 0;
+    for ( i = 0; i < pCut->nSize; i++ )
+        pCut->uHash |= (1 << (pCut->pArray[i] % 31));
+    return pCut->uHash;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives new cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutDeriveNew3( Ivy_Cut_t * pCut, Ivy_Cut_t * pCutNew, int IdOld, int IdNew0, int IdNew1 )
+{
+    int i, k; 
+    assert( pCut->nSize > 0 );
+    assert( IdNew0 < IdNew1 );
+    for ( i = k = 0; i < pCut->nSize; i++ )
+    {
+        if ( pCut->pArray[i] == IdOld )
+            continue;
+        if ( IdNew0 <= pCut->pArray[i] )
+        {
+            if ( IdNew0 < pCut->pArray[i] )
+                pCutNew->pArray[ k++ ] = IdNew0;
+            IdNew0 = 0x7FFFFFFF;
+        }
+        if ( IdNew1 <= pCut->pArray[i] )
+        {
+            if ( IdNew1 < pCut->pArray[i] )
+                pCutNew->pArray[ k++ ] = IdNew1;
+            IdNew1 = 0x7FFFFFFF;
+        }
+        pCutNew->pArray[ k++ ] = pCut->pArray[i];
+    }
+    if ( IdNew0 < 0x7FFFFFFF )
+        pCutNew->pArray[ k++ ] = IdNew0;
+    if ( IdNew1 < 0x7FFFFFFF )
+        pCutNew->pArray[ k++ ] = IdNew1;
+    pCutNew->nSize = k;
+    assert( pCutNew->nSize <= pCut->nSizeMax );
+    Ivy_NodeCutHash( pCutNew );
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if pDom is contained in pCut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Ivy_CutCheckDominance( Ivy_Cut_t * pDom, Ivy_Cut_t * pCut )
+{
+    int i, k;
+    for ( i = 0; i < pDom->nSize; i++ )
+    {
+        assert( i==0 || pDom->pArray[i-1] < pDom->pArray[i] );
+        for ( k = 0; k < pCut->nSize; k++ )
+            if ( pDom->pArray[i] == pCut->pArray[k] )
+                break;
+        if ( k == pCut->nSize ) // node i in pDom is not contained in pCut
+            return 0;
+    }
+    // every node in pDom is contained in pCut
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Check if the cut exists.]
+
+  Description [Returns 1 if the cut exists.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_CutFindOrAddFilter( Ivy_Store_t * pCutStore, Ivy_Cut_t * pCutNew )
+{
+    Ivy_Cut_t * pCut;
+    int i, k;
+    assert( pCutNew->uHash );
+    // try to find the cut
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+    {
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        if ( pCut->nSize == pCutNew->nSize )
+        {
+            if ( pCut->uHash == pCutNew->uHash )
+            {
+                for ( k = 0; k < pCutNew->nSize; k++ )
+                    if ( pCut->pArray[k] != pCutNew->pArray[k] )
+                        break;
+                if ( k == pCutNew->nSize )
+                    return 1;
+            }
+            continue;
+        }
+        if ( pCut->nSize < pCutNew->nSize )
+        {
+            // skip the non-contained cuts
+            if ( (pCut->uHash & pCutNew->uHash) != pCut->uHash )
+                continue;
+            // check containment seriously
+            if ( Ivy_CutCheckDominance( pCut, pCutNew ) )
+                return 1;
+            continue;
+        }
+        // check potential containment of other cut
+
+        // skip the non-contained cuts
+        if ( (pCut->uHash & pCutNew->uHash) != pCutNew->uHash )
+            continue;
+        // check containment seriously
+        if ( Ivy_CutCheckDominance( pCutNew, pCut ) )
+        {
+            // remove the current cut
+            pCut->nSize = 0;
+        }
+    }
+    assert( pCutStore->nCuts < pCutStore->nCutsMax );
+    // add the cut
+    pCut = pCutStore->pCuts + pCutStore->nCuts++;
+    *pCut = *pCutNew;
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compresses the cut representation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_CutCompactAll( Ivy_Store_t * pCutStore )
+{
+    Ivy_Cut_t * pCut;
+    int i, k;
+    pCutStore->nCutsM = 0;
+    for ( i = k = 0; i < pCutStore->nCuts; i++ )
+    {
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        if ( pCut->nSize < pCut->nSizeMax )
+            pCutStore->nCutsM++;
+        pCutStore->pCuts[k++] = *pCut;
+    }
+    pCutStore->nCuts = k;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_CutPrintForNode( Ivy_Cut_t * pCut )
+{
+    int i;
+    assert( pCut->nSize > 0 );
+    printf( "%d : {", pCut->nSize );
+    for ( i = 0; i < pCut->nSize; i++ )
+        printf( " %d", pCut->pArray[i] );
+    printf( " }\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_CutPrintForNodes( Ivy_Store_t * pCutStore )
+{
+    int i;
+    printf( "Node %d\n", pCutStore->pCuts[0].pArray[0] );
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+        Ivy_CutPrintForNode( pCutStore->pCuts + i );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     [] 
+
+***********************************************************************/
+static inline int Ivy_CutReadLeaf( Ivy_Obj_t * pFanin )
+{
+    int nLats, iLeaf;
+    assert( !Ivy_IsComplement(pFanin) );
+    if ( !Ivy_ObjIsLatch(pFanin) )
+        return Ivy_LeafCreate( pFanin->Id, 0 );
+    iLeaf = Ivy_CutReadLeaf(Ivy_ObjFanin0(pFanin));
+    nLats = Ivy_LeafLat(iLeaf);
+    assert( nLats < IVY_LEAF_MASK );
+    return 1 + iLeaf;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Store_t * Ivy_CutComputeForNode( Ivy_Man_t * p, Ivy_Obj_t * pObj, int nLeaves )
+{
+    static Ivy_Store_t CutStore, * pCutStore = &CutStore;
+    Ivy_Cut_t CutNew, * pCutNew = &CutNew, * pCut;
+    Ivy_Man_t * pMan = p;
+    Ivy_Obj_t * pLeaf;
+    int i, k, Temp, nLats, iLeaf0, iLeaf1;
+
+    assert( nLeaves <= IVY_CUT_INPUT );
+
+    // start the structure
+    pCutStore->nCuts = 0;
+    pCutStore->nCutsMax = IVY_CUT_LIMIT;
+    // start the trivial cut
+    pCutNew->uHash = 0;
+    pCutNew->nSize = 1;
+    pCutNew->nSizeMax = nLeaves;
+    pCutNew->pArray[0] = Ivy_LeafCreate( pObj->Id, 0 );
+    pCutNew->uHash = Ivy_CutHashValue( pCutNew->pArray[0] );
+    // add the trivial cut
+    pCutStore->pCuts[pCutStore->nCuts++] = *pCutNew;
+    assert( pCutStore->nCuts == 1 );
+
+    // explore the cuts
+    for ( i = 0; i < pCutStore->nCuts; i++ )
+    {
+        // expand this cut
+        pCut = pCutStore->pCuts + i;
+        if ( pCut->nSize == 0 )
+            continue;
+        for ( k = 0; k < pCut->nSize; k++ )
+        {
+            pLeaf = Ivy_ManObj( p, Ivy_LeafId(pCut->pArray[k]) );
+            if ( Ivy_ObjIsCi(pLeaf) || Ivy_ObjIsConst1(pLeaf) )
+                continue;
+            assert( Ivy_ObjIsNode(pLeaf) );
+            nLats = Ivy_LeafLat(pCut->pArray[k]);
+
+            // get the fanins fanins
+            iLeaf0 = Ivy_CutReadLeaf( Ivy_ObjFanin0(pLeaf) );
+            iLeaf1 = Ivy_CutReadLeaf( Ivy_ObjFanin1(pLeaf) );
+            assert( nLats + Ivy_LeafLat(iLeaf0) < IVY_LEAF_MASK && nLats + Ivy_LeafLat(iLeaf1) < IVY_LEAF_MASK );
+            iLeaf0 = nLats + iLeaf0;
+            iLeaf1 = nLats + iLeaf1;
+            if ( !Ivy_CutPrescreen( pCut, iLeaf0, iLeaf1 ) )
+                continue;
+            // the given cut exist
+            if ( iLeaf0 > iLeaf1 )
+                Temp = iLeaf0, iLeaf0 = iLeaf1, iLeaf1 = Temp;
+            // create the new cut
+            if ( !Ivy_CutDeriveNew( pCut, pCutNew, pCut->pArray[k], iLeaf0, iLeaf1 ) )
+                continue;
+            // add the cut
+            Ivy_CutFindOrAddFilter( pCutStore, pCutNew );
+            if ( pCutStore->nCuts == IVY_CUT_LIMIT )
+                break;
+        }
+        if ( pCutStore->nCuts == IVY_CUT_LIMIT )
+            break;
+    }
+    if ( pCutStore->nCuts == IVY_CUT_LIMIT )
+        pCutStore->fSatur = 1;
+    else
+        pCutStore->fSatur = 0;
+//    printf( "%d ", pCutStore->nCuts );
+    Ivy_CutCompactAll( pCutStore );
+//    printf( "%d \n", pCutStore->nCuts );
+//    Ivy_CutPrintForNodes( pCutStore );
+    return pCutStore;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_CutComputeAll( Ivy_Man_t * p, int nInputs )
+{
+    Ivy_Store_t * pStore;
+    Ivy_Obj_t * pObj;
+    int i, nCutsTotal, nCutsTotalM, nNodeTotal, nNodeOver;
+    int clk = clock();
+    if ( nInputs > IVY_CUT_INPUT )
+    {
+        printf( "Cannot compute cuts for more than %d inputs.\n", IVY_CUT_INPUT );
+        return;
+    }
+    nNodeTotal = nNodeOver = 0;
+    nCutsTotal = nCutsTotalM = -Ivy_ManNodeNum(p);
+    Ivy_ManForEachObj( p, pObj, i )
+    {
+        if ( !Ivy_ObjIsNode(pObj) )
+            continue;
+        pStore = Ivy_CutComputeForNode( p, pObj, nInputs );
+        nCutsTotal  += pStore->nCuts;
+        nCutsTotalM += pStore->nCutsM;
+        nNodeOver   += pStore->fSatur;
+        nNodeTotal++;
+    }
+    printf( "All = %6d. Minus = %6d. Triv = %6d.   Node = %6d. Satur = %6d.  ", 
+        nCutsTotal, nCutsTotalM, Ivy_ManPiNum(p) + Ivy_ManNodeNum(p), nNodeTotal, nNodeOver );
+    PRT( "Time", clock() - clk );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyShow.c b/abc70930/src/aig/ivy/ivyShow.c
new file mode 100644
index 00000000..cd726e43
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyShow.c
@@ -0,0 +1,338 @@
+/**CFile****************************************************************
+
+  FileName    [ivyShow.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Visualization of HAIG.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyShow.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static void Ivy_WriteDotAig( Ivy_Man_t * pMan, char * pFileName, int fHaig, Vec_Ptr_t * vBold );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManShow( Ivy_Man_t * pMan, int fHaig, Vec_Ptr_t * vBold )
+{
+    extern void Abc_ShowFile( char * FileNameDot );
+    static Counter = 0;
+    char FileNameDot[200];
+    FILE * pFile;
+    // create the file name
+//    Ivy_ShowGetFileName( pMan->pName, FileNameDot );
+    sprintf( FileNameDot, "temp%02d.dot", Counter++ );
+    // check that the file can be opened
+    if ( (pFile = fopen( FileNameDot, "w" )) == NULL )
+    {
+        fprintf( stdout, "Cannot open the intermediate file \"%s\".\n", FileNameDot );
+        return;
+    }
+    fclose( pFile );
+    // generate the file
+    Ivy_WriteDotAig( pMan, FileNameDot, fHaig, vBold );
+    // visualize the file 
+    Abc_ShowFile( FileNameDot );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes the graph structure of AIG for DOT.]
+
+  Description [Useful for graph visualization using tools such as GraphViz: 
+  http://www.graphviz.org/]
+  
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_WriteDotAig( Ivy_Man_t * pMan, char * pFileName, int fHaig, Vec_Ptr_t * vBold )
+{
+    FILE * pFile;
+    Ivy_Obj_t * pNode, * pTemp, * pPrev;
+    int LevelMax, Level, i;
+
+    if ( Ivy_ManNodeNum(pMan) > 200 )
+    {
+        fprintf( stdout, "Cannot visualize AIG with more than 200 nodes.\n" );
+        return;
+    }
+    if ( (pFile = fopen( pFileName, "w" )) == NULL )
+    {
+        fprintf( stdout, "Cannot open the intermediate file \"%s\".\n", pFileName );
+        return;
+    }
+
+    // mark the nodes
+    if ( vBold )
+        Vec_PtrForEachEntry( vBold, pNode, i )
+            pNode->fMarkB = 1;
+
+    // compute levels
+    LevelMax = 1 + Ivy_ManSetLevels( pMan, fHaig );
+
+    // write the DOT header
+    fprintf( pFile, "# %s\n",  "AIG structure generated by IVY package" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "digraph AIG {\n" );
+    fprintf( pFile, "size = \"7.5,10\";\n" );
+//  fprintf( pFile, "ranksep = 0.5;\n" );
+//  fprintf( pFile, "nodesep = 0.5;\n" );
+    fprintf( pFile, "center = true;\n" );
+//  fprintf( pFile, "orientation = landscape;\n" );
+//  fprintf( pFile, "edge [fontsize = 10];\n" );
+//  fprintf( pFile, "edge [dir = none];\n" );
+    fprintf( pFile, "edge [dir = back];\n" );
+    fprintf( pFile, "\n" );
+
+    // labels on the left of the picture
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  node [shape = plaintext];\n" );
+    fprintf( pFile, "  edge [style = invis];\n" );
+    fprintf( pFile, "  LevelTitle1 [label=\"\"];\n" );
+    fprintf( pFile, "  LevelTitle2 [label=\"\"];\n" );
+    // generate node names with labels
+    for ( Level = LevelMax; Level >= 0; Level-- )
+    {
+        // the visible node name
+        fprintf( pFile, "  Level%d", Level );
+        fprintf( pFile, " [label = " );
+        // label name
+        fprintf( pFile, "\"" );
+        fprintf( pFile, "\"" );
+        fprintf( pFile, "];\n" );
+    }
+
+    // genetate the sequence of visible/invisible nodes to mark levels
+    fprintf( pFile, "  LevelTitle1 ->  LevelTitle2 ->" );
+    for ( Level = LevelMax; Level >= 0; Level-- )
+    {
+        // the visible node name
+        fprintf( pFile, "  Level%d",  Level );
+        // the connector
+        if ( Level != 0 )
+            fprintf( pFile, " ->" );
+        else
+            fprintf( pFile, ";" );
+    }
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate title box on top
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    fprintf( pFile, "  LevelTitle1;\n" );
+    fprintf( pFile, "  title1 [shape=plaintext,\n" );
+    fprintf( pFile, "          fontsize=20,\n" );
+    fprintf( pFile, "          fontname = \"Times-Roman\",\n" );
+    fprintf( pFile, "          label=\"" );
+    fprintf( pFile, "%s", "AIG structure visualized by ABC" );
+    fprintf( pFile, "\\n" );
+    fprintf( pFile, "Benchmark \\\"%s\\\". ", "aig" );
+    fprintf( pFile, "Time was %s. ",  Extra_TimeStamp() );
+    fprintf( pFile, "\"\n" );
+    fprintf( pFile, "         ];\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate statistics box
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    fprintf( pFile, "  LevelTitle2;\n" );
+    fprintf( pFile, "  title2 [shape=plaintext,\n" );
+    fprintf( pFile, "          fontsize=18,\n" );
+    fprintf( pFile, "          fontname = \"Times-Roman\",\n" );
+    fprintf( pFile, "          label=\"" );
+    fprintf( pFile, "The set contains %d logic nodes and spans %d levels.", Ivy_ManNodeNum(pMan), LevelMax );
+    fprintf( pFile, "\\n" );
+    fprintf( pFile, "\"\n" );
+    fprintf( pFile, "         ];\n" );
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate the COs
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    // the labeling node of this level
+    fprintf( pFile, "  Level%d;\n",  LevelMax );
+    // generate the CO nodes
+    Ivy_ManForEachCo( pMan, pNode, i )
+    {
+        if ( fHaig || pNode->pEquiv == NULL )
+            fprintf( pFile, "  Node%d%s [label = \"%d%s\"", pNode->Id, 
+                (Ivy_ObjIsLatch(pNode)? "_in":""), pNode->Id, (Ivy_ObjIsLatch(pNode)? "_in":"") );
+        else
+            fprintf( pFile, "  Node%d%s [label = \"%d%s(%d%s)\"", pNode->Id, 
+                (Ivy_ObjIsLatch(pNode)? "_in":""), pNode->Id, (Ivy_ObjIsLatch(pNode)? "_in":""), 
+                    Ivy_Regular(pNode->pEquiv)->Id, Ivy_IsComplement(pNode->pEquiv)? "\'":"" );
+        fprintf( pFile, ", shape = %s", (Ivy_ObjIsLatch(pNode)? "box":"invtriangle") );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate nodes of each rank
+    for ( Level = LevelMax - 1; Level > 0; Level-- )
+    {
+        fprintf( pFile, "{\n" );
+        fprintf( pFile, "  rank = same;\n" );
+        // the labeling node of this level
+        fprintf( pFile, "  Level%d;\n",  Level );
+        Ivy_ManForEachObj( pMan, pNode, i )
+        {
+            if ( (int)pNode->Level != Level )
+                continue;
+            if ( fHaig || pNode->pEquiv == NULL )
+                fprintf( pFile, "  Node%d [label = \"%d\"", pNode->Id, pNode->Id );
+            else 
+                fprintf( pFile, "  Node%d [label = \"%d(%d%s)\"", pNode->Id, pNode->Id, 
+                    Ivy_Regular(pNode->pEquiv)->Id, Ivy_IsComplement(pNode->pEquiv)? "\'":"" );
+            fprintf( pFile, ", shape = ellipse" );
+            if ( vBold && pNode->fMarkB )
+                fprintf( pFile, ", style = filled" );
+            fprintf( pFile, "];\n" );
+        }
+        fprintf( pFile, "}" );
+        fprintf( pFile, "\n" );
+        fprintf( pFile, "\n" );
+    }
+
+    // generate the CI nodes
+    fprintf( pFile, "{\n" );
+    fprintf( pFile, "  rank = same;\n" );
+    // the labeling node of this level
+    fprintf( pFile, "  Level%d;\n",  0 );
+    // generate constant node
+    if ( Ivy_ObjRefs(Ivy_ManConst1(pMan)) > 0 )
+    {
+        pNode = Ivy_ManConst1(pMan);
+        // check if the costant node is present
+        fprintf( pFile, "  Node%d [label = \"Const1\"", pNode->Id );
+        fprintf( pFile, ", shape = ellipse" );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    // generate the CI nodes
+    Ivy_ManForEachCi( pMan, pNode, i )
+    {
+        if ( fHaig || pNode->pEquiv == NULL )
+            fprintf( pFile, "  Node%d%s [label = \"%d%s\"", pNode->Id, 
+                (Ivy_ObjIsLatch(pNode)? "_out":""), pNode->Id, (Ivy_ObjIsLatch(pNode)? "_out":"") );
+        else
+            fprintf( pFile, "  Node%d%s [label = \"%d%s(%d%s)\"", pNode->Id, 
+                (Ivy_ObjIsLatch(pNode)? "_out":""), pNode->Id, (Ivy_ObjIsLatch(pNode)? "_out":""), 
+                    Ivy_Regular(pNode->pEquiv)->Id, Ivy_IsComplement(pNode->pEquiv)? "\'":"" );
+        fprintf( pFile, ", shape = %s", (Ivy_ObjIsLatch(pNode)? "box":"triangle") );
+        fprintf( pFile, ", color = coral, fillcolor = coral" );
+        fprintf( pFile, "];\n" );
+    }
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+
+    // generate invisible edges from the square down
+    fprintf( pFile, "title1 -> title2 [style = invis];\n" );
+    Ivy_ManForEachCo( pMan, pNode, i )
+        fprintf( pFile, "title2 -> Node%d%s [style = invis];\n", pNode->Id, (Ivy_ObjIsLatch(pNode)? "_in":"") );
+
+    // generate edges
+    Ivy_ManForEachObj( pMan, pNode, i )
+    {
+        if ( !Ivy_ObjIsNode(pNode) && !Ivy_ObjIsCo(pNode) && !Ivy_ObjIsBuf(pNode) )
+            continue;
+        // generate the edge from this node to the next
+        fprintf( pFile, "Node%d%s",  pNode->Id, (Ivy_ObjIsLatch(pNode)? "_in":"") );
+        fprintf( pFile, " -> " );
+        fprintf( pFile, "Node%d%s",  Ivy_ObjFaninId0(pNode), (Ivy_ObjIsLatch(Ivy_ObjFanin0(pNode))? "_out":"") );
+        fprintf( pFile, " [" );
+        fprintf( pFile, "style = %s", Ivy_ObjFaninC0(pNode)? "dotted" : "bold" );
+//        if ( Ivy_NtkIsSeq(pNode->pMan) && Seq_ObjFaninL0(pNode) > 0 )
+//        fprintf( pFile, ", label = \"%s\"", Seq_ObjFaninGetInitPrintable(pNode,0) );
+        fprintf( pFile, "]" );
+        fprintf( pFile, ";\n" );
+        if ( !Ivy_ObjIsNode(pNode) )
+            continue;
+        // generate the edge from this node to the next
+        fprintf( pFile, "Node%d",  pNode->Id );
+        fprintf( pFile, " -> " );
+        fprintf( pFile, "Node%d%s",  Ivy_ObjFaninId1(pNode), (Ivy_ObjIsLatch(Ivy_ObjFanin1(pNode))? "_out":"") );
+        fprintf( pFile, " [" );
+        fprintf( pFile, "style = %s", Ivy_ObjFaninC1(pNode)? "dotted" : "bold" );
+//        if ( Ivy_NtkIsSeq(pNode->pMan) && Seq_ObjFaninL1(pNode) > 0 )
+//        fprintf( pFile, ", label = \"%s\"", Seq_ObjFaninGetInitPrintable(pNode,1) );
+        fprintf( pFile, "]" );
+        fprintf( pFile, ";\n" );
+        // generate the edges between the equivalent nodes
+        if ( fHaig && pNode->pEquiv && Ivy_ObjRefs(pNode) > 0 )
+        {
+            pPrev = pNode;
+            for ( pTemp = pNode->pEquiv; pTemp != pNode; pTemp = Ivy_Regular(pTemp->pEquiv) )
+            {
+                fprintf( pFile, "Node%d",  pPrev->Id );
+                fprintf( pFile, " -> " );
+                fprintf( pFile, "Node%d",  pTemp->Id );
+                fprintf( pFile, " [style = %s]", Ivy_IsComplement(pTemp->pEquiv)? "dotted" : "bold" );
+                fprintf( pFile, ";\n" );
+                pPrev = pTemp;
+            }
+            // connect the last node with the first
+            fprintf( pFile, "Node%d",  pPrev->Id );
+            fprintf( pFile, " -> " );
+            fprintf( pFile, "Node%d",  pNode->Id );
+            fprintf( pFile, " [style = %s]", Ivy_IsComplement(pPrev->pEquiv)? "dotted" : "bold" );
+            fprintf( pFile, ";\n" );
+        }
+    }
+
+    fprintf( pFile, "}" );
+    fprintf( pFile, "\n" );
+    fprintf( pFile, "\n" );
+    fclose( pFile );
+
+    // unmark nodes
+    if ( vBold )
+        Vec_PtrForEachEntry( vBold, pNode, i )
+            pNode->fMarkB = 0;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyTable.c b/abc70930/src/aig/ivy/ivyTable.c
new file mode 100644
index 00000000..2ac0ae49
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyTable.c
@@ -0,0 +1,301 @@
+/**CFile****************************************************************
+
+  FileName    [ivyTable.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Structural hashing table.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006. ]
+
+  Revision    [$Id: ivyTable.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// hashing the node
+static unsigned Ivy_Hash( Ivy_Obj_t * pObj, int TableSize ) 
+{
+    unsigned Key = Ivy_ObjIsExor(pObj) * 1699;
+    Key ^= Ivy_ObjFaninId0(pObj) * 7937;
+    Key ^= Ivy_ObjFaninId1(pObj) * 2971;
+    Key ^= Ivy_ObjFaninC0(pObj) * 911;
+    Key ^= Ivy_ObjFaninC1(pObj) * 353;
+    Key ^= Ivy_ObjInit(pObj) * 911;
+    return Key % TableSize;
+}
+
+// returns the place where this node is stored (or should be stored)
+static int * Ivy_TableFind( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    int i;
+    assert( Ivy_ObjIsHash(pObj) );
+    for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize )
+        if ( p->pTable[i] == pObj->Id )
+            break;
+    return p->pTable + i;
+}
+
+static void         Ivy_TableResize( Ivy_Man_t * p );
+static unsigned int Cudd_PrimeAig( unsigned int  p );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+ 
+/**Function*************************************************************
+
+  Synopsis    [Checks if node with the given attributes is in the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_TableLookup( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pEntry;
+    int i;
+    assert( !Ivy_IsComplement(pObj) );
+    if ( !Ivy_ObjIsHash(pObj) )
+        return NULL;
+    assert( Ivy_ObjIsLatch(pObj) || Ivy_ObjFaninId0(pObj) > 0 );
+    assert( Ivy_ObjFaninId1(pObj) == 0 || Ivy_ObjFaninId0(pObj) < Ivy_ObjFaninId1(pObj) );
+    if ( Ivy_ObjFanin0(pObj)->nRefs == 0 || (Ivy_ObjChild1(pObj) && Ivy_ObjFanin1(pObj)->nRefs == 0) )
+        return NULL;
+    for ( i = Ivy_Hash(pObj, p->nTableSize); p->pTable[i]; i = (i+1) % p->nTableSize )
+    {
+        pEntry = Ivy_ManObj( p, p->pTable[i] );
+        if ( Ivy_ObjChild0(pEntry) == Ivy_ObjChild0(pObj) && 
+             Ivy_ObjChild1(pEntry) == Ivy_ObjChild1(pObj) && 
+             Ivy_ObjInit(pEntry) == Ivy_ObjInit(pObj) && 
+             Ivy_ObjType(pEntry) == Ivy_ObjType(pObj) )
+            return pEntry;
+    }
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the node to the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TableInsert( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    int * pPlace;
+    assert( !Ivy_IsComplement(pObj) );
+    if ( !Ivy_ObjIsHash(pObj) )
+        return;
+    if ( (pObj->Id & 63) == 0 )
+    {
+        if ( p->nTableSize < 2 * Ivy_ManHashObjNum(p) )
+            Ivy_TableResize( p );
+    }
+    pPlace = Ivy_TableFind( p, pObj );
+    assert( *pPlace == 0 );
+    *pPlace = pObj->Id;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deletes the node from the hash table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TableDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pEntry;
+    int i, * pPlace;
+    assert( !Ivy_IsComplement(pObj) );
+    if ( !Ivy_ObjIsHash(pObj) )
+        return;
+    pPlace = Ivy_TableFind( p, pObj );
+    assert( *pPlace == pObj->Id ); // node should be in the table
+    *pPlace = 0;
+    // rehash the adjacent entries
+    i = pPlace - p->pTable;
+    for ( i = (i+1) % p->nTableSize; p->pTable[i]; i = (i+1) % p->nTableSize )
+    {
+        pEntry = Ivy_ManObj( p, p->pTable[i] );
+        p->pTable[i] = 0;
+        Ivy_TableInsert( p, pEntry );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Updates the table to point to the new node.]
+
+  Description [If the old node (pObj) is in the table, updates the table
+  to point to an object with different ID (ObjIdNew). The table should
+  not contain an object with ObjIdNew (this is currently not checked).]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TableUpdate( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ObjIdNew )
+{
+    int * pPlace;
+    assert( !Ivy_IsComplement(pObj) );
+    if ( !Ivy_ObjIsHash(pObj) )
+        return;
+    pPlace = Ivy_TableFind( p, pObj );
+    assert( *pPlace == pObj->Id ); // node should be in the table
+    *pPlace = ObjIdNew; 
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Count the number of nodes in the table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_TableCountEntries( Ivy_Man_t * p )
+{
+    int i, Counter = 0;
+    for ( i = 0; i < p->nTableSize; i++ )
+        Counter += (p->pTable[i] != 0);
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Resizes the table.]
+
+  Description [Typically this procedure should not be called.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_TableResize( Ivy_Man_t * p )
+{
+    int * pTableOld, * pPlace;
+    int nTableSizeOld, Counter, nEntries, e, clk;
+clk = clock();
+    // save the old table
+    pTableOld = p->pTable;
+    nTableSizeOld = p->nTableSize;
+    // get the new table
+    p->nTableSize = Cudd_PrimeAig( 5 * Ivy_ManHashObjNum(p) ); 
+    p->pTable = ALLOC( int, p->nTableSize );
+    memset( p->pTable, 0, sizeof(int) * p->nTableSize );
+    // rehash the entries from the old table
+    Counter = 0;
+    for ( e = 0; e < nTableSizeOld; e++ )
+    {
+        if ( pTableOld[e] == 0 )
+            continue;
+        Counter++;
+        // get the place where this entry goes in the table table
+        pPlace = Ivy_TableFind( p, Ivy_ManObj(p, pTableOld[e]) );
+        assert( *pPlace == 0 ); // should not be in the table
+        *pPlace = pTableOld[e];
+    }
+    nEntries = Ivy_ManHashObjNum(p);
+//    assert( Counter == nEntries );
+//    printf( "Increasing the structural table size from %6d to %6d. ", nTableSizeOld, p->nTableSize );
+//    PRT( "Time", clock() - clk );
+    // replace the table and the parameters
+    free( pTableOld );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Profiles the hash table.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Ivy_TableProfile( Ivy_Man_t * p )
+{
+    int i, Counter = 0;
+    for ( i = 0; i < p->nTableSize; i++ )
+    {
+        if ( p->pTable[i] )
+            Counter++;
+        else if ( Counter )
+        {
+            printf( "%d ", Counter );
+            Counter = 0;
+        }
+    }
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Returns the next prime &gt;= p.]
+
+  Description [Copied from CUDD, for stand-aloneness.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+unsigned int Cudd_PrimeAig( unsigned int  p)
+{
+    int i,pn;
+
+    p--;
+    do {
+        p++;
+        if (p&1) {
+        pn = 1;
+        i = 3;
+        while ((unsigned) (i * i) <= p) {
+        if (p % i == 0) {
+            pn = 0;
+            break;
+        }
+        i += 2;
+        }
+    } else {
+        pn = 0;
+    }
+    } while (!pn);
+    return(p);
+
+} /* end of Cudd_Prime */
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivyUtil.c b/abc70930/src/aig/ivy/ivyUtil.c
new file mode 100644
index 00000000..ab62a276
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivyUtil.c
@@ -0,0 +1,818 @@
+/**CFile****************************************************************
+
+  FileName    [ivyUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    [Various procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivyUtil.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Increments the current traversal ID of the network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManIncrementTravId( Ivy_Man_t * p )
+{
+    if ( p->nTravIds >= (1<<30)-1 - 1000 )
+        Ivy_ManCleanTravId( p );
+    p->nTravIds++;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sets the DFS ordering of the nodes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCleanTravId( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    p->nTravIds = 1;
+    Ivy_ManForEachObj( p, pObj, i )
+        pObj->TravId = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCollectCut_rec( Ivy_Man_t * p, Ivy_Obj_t * pNode, Vec_Int_t * vNodes )
+{
+    if ( pNode->fMarkA )
+        return;
+    pNode->fMarkA = 1;
+    assert( Ivy_ObjIsAnd(pNode) || Ivy_ObjIsExor(pNode) );
+    Ivy_ManCollectCut_rec( p, Ivy_ObjFanin0(pNode), vNodes );
+    Ivy_ManCollectCut_rec( p, Ivy_ObjFanin1(pNode), vNodes );
+    Vec_IntPush( vNodes, pNode->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description [Does not modify the array of leaves. Uses array vTruth to store 
+  temporary truth tables. The returned pointer should be used immediately.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCollectCut( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Int_t * vLeaves, Vec_Int_t * vNodes )
+{
+    int i, Leaf;
+    // collect and mark the leaves
+    Vec_IntClear( vNodes );
+    Vec_IntForEachEntry( vLeaves, Leaf, i )
+    {
+        Vec_IntPush( vNodes, Leaf );
+        Ivy_ManObj(p, Leaf)->fMarkA = 1;
+    }
+    // collect and mark the nodes
+    Ivy_ManCollectCut_rec( p, pRoot, vNodes );
+    // clean the nodes
+    Vec_IntForEachEntry( vNodes, Leaf, i )
+        Ivy_ManObj(p, Leaf)->fMarkA = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the pointer to the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Ivy_ObjGetTruthStore( int ObjNum, Vec_Int_t * vTruth )
+{
+   return ((unsigned *)Vec_IntArray(vTruth)) + 8 * ObjNum;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManCutTruthOne( Ivy_Man_t * p, Ivy_Obj_t * pNode, Vec_Int_t * vTruth, int nWords )
+{
+    unsigned * pTruth, * pTruth0, * pTruth1;
+    int i;
+    pTruth  = Ivy_ObjGetTruthStore( pNode->TravId, vTruth );
+    pTruth0 = Ivy_ObjGetTruthStore( Ivy_ObjFanin0(pNode)->TravId, vTruth );
+    pTruth1 = Ivy_ObjGetTruthStore( Ivy_ObjFanin1(pNode)->TravId, vTruth );
+    if ( Ivy_ObjIsExor(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] ^ pTruth1[i];
+    else if ( !Ivy_ObjFaninC0(pNode) && !Ivy_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] & pTruth1[i];
+    else if ( !Ivy_ObjFaninC0(pNode) && Ivy_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = pTruth0[i] & ~pTruth1[i];
+    else if ( Ivy_ObjFaninC0(pNode) && !Ivy_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ~pTruth0[i] & pTruth1[i];
+    else // if ( Ivy_ObjFaninC0(pNode) && Ivy_ObjFaninC1(pNode) )
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ~pTruth0[i] & ~pTruth1[i];
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes truth table of the cut.]
+
+  Description [Does not modify the array of leaves. Uses array vTruth to store 
+  temporary truth tables. The returned pointer should be used immediately.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Ivy_ManCutTruth( Ivy_Man_t * p, Ivy_Obj_t * pRoot, Vec_Int_t * vLeaves, Vec_Int_t * vNodes, Vec_Int_t * vTruth )
+{
+    static unsigned uTruths[8][8] = { // elementary truth tables
+        { 0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA },
+        { 0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC },
+        { 0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0 },
+        { 0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00 },
+        { 0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000 }, 
+        { 0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF }, 
+        { 0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF,0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF }, 
+        { 0x00000000,0x00000000,0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF } 
+    };
+    int i, Leaf;
+    // collect the cut
+    Ivy_ManCollectCut( p, pRoot, vLeaves, vNodes );
+    // set the node numbers
+    Vec_IntForEachEntry( vNodes, Leaf, i )
+        Ivy_ManObj(p, Leaf)->TravId = i;
+    // alloc enough memory
+    Vec_IntClear( vTruth );
+    Vec_IntGrow( vTruth, 8 * Vec_IntSize(vNodes) );
+    // set the elementary truth tables
+    Vec_IntForEachEntry( vLeaves, Leaf, i )
+        memcpy( Ivy_ObjGetTruthStore(i, vTruth), uTruths[i], 8 * sizeof(unsigned) );
+    // compute truths for other nodes
+    Vec_IntForEachEntryStart( vNodes, Leaf, i, Vec_IntSize(vLeaves) )
+        Ivy_ManCutTruthOne( p, Ivy_ManObj(p, Leaf), vTruth, 8 );
+    return Ivy_ObjGetTruthStore( pRoot->TravId, vTruth );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Int_t * Ivy_ManLatches( Ivy_Man_t * p )
+{
+    Vec_Int_t * vLatches;
+    Ivy_Obj_t * pObj;
+    int i;
+    vLatches = Vec_IntAlloc( Ivy_ManLatchNum(p) );
+    Ivy_ManForEachLatch( p, pObj, i )
+        Vec_IntPush( vLatches, pObj->Id );
+    return vLatches;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManLevels( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i, LevelMax = 0;
+    Ivy_ManForEachPo( p, pObj, i )
+        LevelMax = IVY_MAX( LevelMax, (int)Ivy_ObjFanin0(pObj)->Level );
+    return LevelMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ManResetLevels_rec( Ivy_Obj_t * pObj )
+{
+    if ( pObj->Level || Ivy_ObjIsCi(pObj) || Ivy_ObjIsConst1(pObj) )
+        return pObj->Level;
+    if ( Ivy_ObjIsBuf(pObj) )
+        return pObj->Level = Ivy_ManResetLevels_rec( Ivy_ObjFanin0(pObj) );
+    assert( Ivy_ObjIsNode(pObj) );
+    Ivy_ManResetLevels_rec( Ivy_ObjFanin0(pObj) );
+    Ivy_ManResetLevels_rec( Ivy_ObjFanin1(pObj) );
+    return pObj->Level = Ivy_ObjLevelNew( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Collect the latches.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManResetLevels( Ivy_Man_t * p )
+{
+    Ivy_Obj_t * pObj;
+    int i;
+    Ivy_ManForEachObj( p, pObj, i )
+        pObj->Level = 0;
+    Ivy_ManForEachCo( p, pObj, i )
+        Ivy_ManResetLevels_rec( Ivy_ObjFanin0(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [References/references the node and returns MFFC size.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjRefDeref( Ivy_Man_t * p, Ivy_Obj_t * pNode, int fReference, int fLabel )
+{
+    Ivy_Obj_t * pNode0, * pNode1;
+    int Counter;
+    // label visited nodes
+    if ( fLabel )
+        Ivy_ObjSetTravIdCurrent( p, pNode );
+    // skip the CI
+    if ( Ivy_ObjIsPi(pNode) )
+        return 0;
+    assert( Ivy_ObjIsNode(pNode) || Ivy_ObjIsBuf(pNode) || Ivy_ObjIsLatch(pNode) );
+    // process the internal node
+    pNode0 = Ivy_ObjFanin0(pNode);
+    pNode1 = Ivy_ObjFanin1(pNode);
+    Counter = Ivy_ObjIsNode(pNode);
+    if ( fReference )
+    {
+        if ( pNode0->nRefs++ == 0 )
+            Counter += Ivy_ObjRefDeref( p, pNode0, fReference, fLabel );
+        if ( pNode1 && pNode1->nRefs++ == 0 )
+            Counter += Ivy_ObjRefDeref( p, pNode1, fReference, fLabel );
+    }
+    else
+    {
+        assert( pNode0->nRefs > 0 );
+        assert( pNode1 == NULL || pNode1->nRefs > 0 );
+        if ( --pNode0->nRefs == 0 )
+            Counter += Ivy_ObjRefDeref( p, pNode0, fReference, fLabel );
+        if ( pNode1 && --pNode1->nRefs == 0 )
+            Counter += Ivy_ObjRefDeref( p, pNode1, fReference, fLabel );
+    }
+    return Counter;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Labels MFFC with the current label.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjMffcLabel( Ivy_Man_t * p, Ivy_Obj_t * pNode )
+{
+    int nConeSize1, nConeSize2;
+    assert( !Ivy_IsComplement( pNode ) );
+    assert( Ivy_ObjIsNode( pNode ) );
+    nConeSize1 = Ivy_ObjRefDeref( p, pNode, 0, 1 ); // dereference
+    nConeSize2 = Ivy_ObjRefDeref( p, pNode, 1, 0 ); // reference
+    assert( nConeSize1 == nConeSize2 );
+    assert( nConeSize1 > 0 );
+    return nConeSize1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively updates fanout levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjUpdateLevel_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pFanout;
+    Vec_Ptr_t * vFanouts;
+    int i, LevelNew;
+    assert( p->fFanout );
+    assert( Ivy_ObjIsNode(pObj) );
+    vFanouts = Vec_PtrAlloc( 10 );
+    Ivy_ObjForEachFanout( p, pObj, vFanouts, pFanout, i )
+    {
+        if ( Ivy_ObjIsCo(pFanout) )
+        {
+//            assert( (int)Ivy_ObjFanin0(pFanout)->Level <= p->nLevelMax );
+            continue;
+        }
+        LevelNew = Ivy_ObjLevelNew( pFanout );
+        if ( (int)pFanout->Level == LevelNew )
+            continue;
+        pFanout->Level = LevelNew;
+        Ivy_ObjUpdateLevel_rec( p, pFanout );
+    }
+    Vec_PtrFree( vFanouts );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the new required level.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjLevelRNew( Ivy_Man_t * p, Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pFanout;
+    Vec_Ptr_t * vFanouts;
+    int i, Required, LevelNew = 1000000;
+    assert( p->fFanout && p->vRequired );
+    vFanouts = Vec_PtrAlloc( 10 );
+    Ivy_ObjForEachFanout( p, pObj, vFanouts, pFanout, i )
+    {
+        Required = Vec_IntEntry(p->vRequired, pFanout->Id);
+        LevelNew = IVY_MIN( LevelNew, Required );
+    }
+    Vec_PtrFree( vFanouts );
+    return LevelNew - 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively updates fanout levels.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjUpdateLevelR_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, int ReqNew )
+{
+    Ivy_Obj_t * pFanin;
+    if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsCi(pObj) )
+        return;
+    assert( Ivy_ObjIsNode(pObj) || Ivy_ObjIsBuf(pObj) );
+    // process the first fanin
+    pFanin = Ivy_ObjFanin0(pObj);
+    if ( Vec_IntEntry(p->vRequired, pFanin->Id) > ReqNew - 1 )
+    {
+        Vec_IntWriteEntry( p->vRequired, pFanin->Id, ReqNew - 1 );
+        Ivy_ObjUpdateLevelR_rec( p, pFanin, ReqNew - 1 );
+    }
+    if ( Ivy_ObjIsBuf(pObj) )
+        return;
+    // process the second fanin
+    pFanin = Ivy_ObjFanin1(pObj);
+    if ( Vec_IntEntry(p->vRequired, pFanin->Id) > ReqNew - 1 )
+    {
+        Vec_IntWriteEntry( p->vRequired, pFanin->Id, ReqNew - 1 );
+        Ivy_ObjUpdateLevelR_rec( p, pFanin, ReqNew - 1 );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the node is the root of MUX or EXOR/NEXOR.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_ObjIsMuxType( Ivy_Obj_t * pNode )
+{
+    Ivy_Obj_t * pNode0, * pNode1;
+    // check that the node is regular
+    assert( !Ivy_IsComplement(pNode) );
+    // if the node is not AND, this is not MUX
+    if ( !Ivy_ObjIsAnd(pNode) )
+        return 0;
+    // if the children are not complemented, this is not MUX
+    if ( !Ivy_ObjFaninC0(pNode) || !Ivy_ObjFaninC1(pNode) )
+        return 0;
+    // get children
+    pNode0 = Ivy_ObjFanin0(pNode);
+    pNode1 = Ivy_ObjFanin1(pNode);
+    // if the children are not ANDs, this is not MUX
+    if ( !Ivy_ObjIsAnd(pNode0) || !Ivy_ObjIsAnd(pNode1) )
+        return 0;
+    // otherwise the node is MUX iff it has a pair of equal grandchildren
+    return (Ivy_ObjFaninId0(pNode0) == Ivy_ObjFaninId0(pNode1) && (Ivy_ObjFaninC0(pNode0) ^ Ivy_ObjFaninC0(pNode1))) || 
+           (Ivy_ObjFaninId0(pNode0) == Ivy_ObjFaninId1(pNode1) && (Ivy_ObjFaninC0(pNode0) ^ Ivy_ObjFaninC1(pNode1))) ||
+           (Ivy_ObjFaninId1(pNode0) == Ivy_ObjFaninId0(pNode1) && (Ivy_ObjFaninC1(pNode0) ^ Ivy_ObjFaninC0(pNode1))) ||
+           (Ivy_ObjFaninId1(pNode0) == Ivy_ObjFaninId1(pNode1) && (Ivy_ObjFaninC1(pNode0) ^ Ivy_ObjFaninC1(pNode1)));
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recognizes what nodes are control and data inputs of a MUX.]
+
+  Description [If the node is a MUX, returns the control variable C.
+  Assigns nodes T and E to be the then and else variables of the MUX. 
+  Node C is never complemented. Nodes T and E can be complemented.
+  This function also recognizes EXOR/NEXOR gates as MUXes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjRecognizeMux( Ivy_Obj_t * pNode, Ivy_Obj_t ** ppNodeT, Ivy_Obj_t ** ppNodeE )
+{
+    Ivy_Obj_t * pNode0, * pNode1;
+    assert( !Ivy_IsComplement(pNode) );
+    assert( Ivy_ObjIsMuxType(pNode) );
+    // get children
+    pNode0 = Ivy_ObjFanin0(pNode);
+    pNode1 = Ivy_ObjFanin1(pNode);
+    // find the control variable
+//    if ( pNode1->p1 == Fraig_Not(pNode2->p1) )
+    if ( Ivy_ObjFaninId0(pNode0) == Ivy_ObjFaninId0(pNode1) && (Ivy_ObjFaninC0(pNode0) ^ Ivy_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Ivy_ObjFaninC0(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild1(pNode0));//pNode1->p2);
+            return Ivy_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild1(pNode1));//pNode2->p2);
+            return Ivy_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+//    else if ( pNode1->p1 == Fraig_Not(pNode2->p2) )
+    else if ( Ivy_ObjFaninId0(pNode0) == Ivy_ObjFaninId1(pNode1) && (Ivy_ObjFaninC0(pNode0) ^ Ivy_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p1) )
+        if ( Ivy_ObjFaninC0(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild1(pNode0));//pNode1->p2);
+            return Ivy_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p1 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild1(pNode0));//pNode1->p2);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild0(pNode1));//pNode2->p1);
+            return Ivy_ObjChild0(pNode0);//pNode1->p1;
+        }
+    }
+//    else if ( pNode1->p2 == Fraig_Not(pNode2->p1) )
+    else if ( Ivy_ObjFaninId1(pNode0) == Ivy_ObjFaninId0(pNode1) && (Ivy_ObjFaninC1(pNode0) ^ Ivy_ObjFaninC0(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Ivy_ObjFaninC1(pNode0) )
+        { // pNode2->p1 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild1(pNode1));//pNode2->p2);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild0(pNode0));//pNode1->p1);
+            return Ivy_ObjChild0(pNode1);//pNode2->p1;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild1(pNode1));//pNode2->p2);
+            return Ivy_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+//    else if ( pNode1->p2 == Fraig_Not(pNode2->p2) )
+    else if ( Ivy_ObjFaninId1(pNode0) == Ivy_ObjFaninId1(pNode1) && (Ivy_ObjFaninC1(pNode0) ^ Ivy_ObjFaninC1(pNode1)) )
+    {
+//        if ( Fraig_IsComplement(pNode1->p2) )
+        if ( Ivy_ObjFaninC1(pNode0) )
+        { // pNode2->p2 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild0(pNode1));//pNode2->p1);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild0(pNode0));//pNode1->p1);
+            return Ivy_ObjChild1(pNode1);//pNode2->p2;
+        }
+        else
+        { // pNode1->p2 is positive phase of C
+            *ppNodeT = Ivy_Not(Ivy_ObjChild0(pNode0));//pNode1->p1);
+            *ppNodeE = Ivy_Not(Ivy_ObjChild0(pNode1));//pNode2->p1);
+            return Ivy_ObjChild1(pNode0);//pNode1->p2;
+        }
+    }
+    assert( 0 ); // this is not MUX
+    return NULL;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the real fanin.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Ivy_Obj_t * Ivy_ObjReal( Ivy_Obj_t * pObj )
+{
+    Ivy_Obj_t * pFanin;
+    if ( pObj == NULL || !Ivy_ObjIsBuf( Ivy_Regular(pObj) ) )
+        return pObj;
+    pFanin = Ivy_ObjReal( Ivy_ObjChild0(Ivy_Regular(pObj)) );
+    return Ivy_NotCond( pFanin, Ivy_IsComplement(pObj) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ObjPrintVerbose( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fHaig )
+{
+    Ivy_Obj_t * pTemp;
+    int fShowFanouts = 0;
+    assert( !Ivy_IsComplement(pObj) );
+    printf( "Node %5d : ", Ivy_ObjId(pObj) );
+    if ( Ivy_ObjIsConst1(pObj) )
+        printf( "constant 1" );
+    else if ( Ivy_ObjIsPi(pObj) )
+        printf( "PI" );
+    else if ( Ivy_ObjIsPo(pObj) )
+        printf( "PO" );
+    else if ( Ivy_ObjIsLatch(pObj) )
+        printf( "latch (%d%s)", Ivy_ObjFanin0(pObj)->Id, (Ivy_ObjFaninC0(pObj)? "\'" : " ") );
+    else if ( Ivy_ObjIsBuf(pObj) )
+        printf( "buffer (%d%s)", Ivy_ObjFanin0(pObj)->Id, (Ivy_ObjFaninC0(pObj)? "\'" : " ") );
+    else
+        printf( "AND( %5d%s, %5d%s )", 
+            Ivy_ObjFanin0(pObj)->Id, (Ivy_ObjFaninC0(pObj)? "\'" : " "), 
+            Ivy_ObjFanin1(pObj)->Id, (Ivy_ObjFaninC1(pObj)? "\'" : " ") );
+    printf( " (refs = %3d)", Ivy_ObjRefs(pObj) );
+    if ( fShowFanouts )
+    {
+        Vec_Ptr_t * vFanouts;
+        Ivy_Obj_t * pFanout;
+        int i;
+        vFanouts = Vec_PtrAlloc( 10 );
+        printf( "\nFanouts:\n" );
+        Ivy_ObjForEachFanout( p, pObj, vFanouts, pFanout, i )
+        {
+            printf( "    " );
+            printf( "Node %5d : ", Ivy_ObjId(pFanout) );
+            if ( Ivy_ObjIsPo(pFanout) )
+                printf( "PO" );
+            else if ( Ivy_ObjIsLatch(pFanout) )
+                printf( "latch (%d%s)", Ivy_ObjFanin0(pFanout)->Id, (Ivy_ObjFaninC0(pFanout)? "\'" : " ") );
+            else if ( Ivy_ObjIsBuf(pFanout) )
+                printf( "buffer (%d%s)", Ivy_ObjFanin0(pFanout)->Id, (Ivy_ObjFaninC0(pFanout)? "\'" : " ") );
+            else
+                printf( "AND( %5d%s, %5d%s )", 
+                    Ivy_ObjFanin0(pFanout)->Id, (Ivy_ObjFaninC0(pFanout)? "\'" : " "), 
+                    Ivy_ObjFanin1(pFanout)->Id, (Ivy_ObjFaninC1(pFanout)? "\'" : " ") );
+            printf( "\n" );
+        }
+        Vec_PtrFree( vFanouts );
+        return;
+    }
+    if ( !fHaig )
+    {
+        if ( pObj->pEquiv == NULL )
+            printf( " HAIG node not given" );
+        else
+            printf( " HAIG node = %d%s", Ivy_Regular(pObj->pEquiv)->Id, (Ivy_IsComplement(pObj->pEquiv)? "\'" : " ") );
+        return;
+    }
+    if ( pObj->pEquiv == NULL )
+        return;
+    // there are choices
+    if ( Ivy_ObjRefs(pObj) > 0 )
+    {
+        // print equivalence class
+        printf( "  { %5d ", pObj->Id );
+        assert( !Ivy_IsComplement(pObj->pEquiv) );
+        for ( pTemp = pObj->pEquiv; pTemp != pObj; pTemp = Ivy_Regular(pTemp->pEquiv) )
+            printf( " %5d%s", pTemp->Id, (Ivy_IsComplement(pTemp->pEquiv)? "\'" : " ") );
+        printf( " }" );
+        return;
+    }
+    // this is a secondary node
+    for ( pTemp = Ivy_Regular(pObj->pEquiv); Ivy_ObjRefs(pTemp) == 0; pTemp = Ivy_Regular(pTemp->pEquiv) );
+    assert( Ivy_ObjRefs(pTemp) > 0 );
+    printf( "  class of %d", pTemp->Id );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints node in HAIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Ivy_ManPrintVerbose( Ivy_Man_t * p, int fHaig )
+{
+    Vec_Int_t * vNodes;
+    Ivy_Obj_t * pObj;
+    int i;
+    printf( "PIs: " );
+    Ivy_ManForEachPi( p, pObj, i )
+        printf( " %d", pObj->Id );
+    printf( "\n" );
+    printf( "POs: " );
+    Ivy_ManForEachPo( p, pObj, i )
+        printf( " %d", pObj->Id );
+    printf( "\n" );
+    printf( "Latches: " );
+    Ivy_ManForEachLatch( p, pObj, i )
+        printf( " %d=%d%s", pObj->Id, Ivy_ObjFanin0(pObj)->Id, (Ivy_ObjFaninC0(pObj)? "\'" : " ") );
+    printf( "\n" );
+    vNodes = Ivy_ManDfsSeq( p, NULL );
+    Ivy_ManForEachNodeVec( p, vNodes, pObj, i )
+        Ivy_ObjPrintVerbose( p, pObj, fHaig ), printf( "\n" );
+    printf( "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs incremental rewriting of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_CutTruthPrint2( Ivy_Man_t * p, Ivy_Cut_t * pCut, unsigned uTruth )
+{
+    int i;
+    printf( "Trying cut : {" );
+    for ( i = 0; i < pCut->nSize; i++ )
+        printf( " %6d(%d)", Ivy_LeafId(pCut->pArray[i]), Ivy_LeafLat(pCut->pArray[i]) );
+    printf( " }   " );
+    Extra_PrintBinary( stdout, &uTruth, 16 );  printf( "\n" );
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs incremental rewriting of the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Ivy_CutTruthPrint( Ivy_Man_t * p, Ivy_Cut_t * pCut, unsigned uTruth )
+{
+    Vec_Ptr_t * vArray;
+    Ivy_Obj_t * pObj, * pFanout;
+    int nLatches = 0;
+    int nPresent = 0;
+    int i, k;
+    int fVerbose = 0;
+
+    if ( fVerbose )
+        printf( "Trying cut : {" );
+    for ( i = 0; i < pCut->nSize; i++ )
+    {
+        if ( fVerbose )
+            printf( " %6d(%d)", Ivy_LeafId(pCut->pArray[i]), Ivy_LeafLat(pCut->pArray[i]) );
+        nLatches += Ivy_LeafLat(pCut->pArray[i]);
+    }
+    if ( fVerbose )
+        printf( " }   " );
+    if ( fVerbose )
+        printf( "Latches = %d. ", nLatches );
+
+    // check if there are latches on the fanout edges
+    vArray = Vec_PtrAlloc( 100 );
+    for ( i = 0; i < pCut->nSize; i++ )
+    {
+        pObj = Ivy_ManObj( p, Ivy_LeafId(pCut->pArray[i]) );
+        Ivy_ObjForEachFanout( p, pObj, vArray, pFanout, k )
+        {
+            if ( Ivy_ObjIsLatch(pFanout) )
+            {
+                nPresent++;
+                break;
+            }
+        }
+    }
+    Vec_PtrSize( vArray );
+    if ( fVerbose )
+    {
+        printf( "Present = %d. ", nPresent );
+        if ( nLatches > nPresent )
+            printf( "Clauses = %d. ", 2*(nLatches - nPresent) );
+        printf( "\n" );
+    }
+    return ( nLatches > nPresent ) ? 2*(nLatches - nPresent) : 0;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/ivy_.c b/abc70930/src/aig/ivy/ivy_.c
new file mode 100644
index 00000000..65689689
--- /dev/null
+++ b/abc70930/src/aig/ivy/ivy_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [ivy_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [And-Inverter Graph package.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - May 11, 2006.]
+
+  Revision    [$Id: ivy_.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "ivy.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/ivy/module.make b/abc70930/src/aig/ivy/module.make
new file mode 100644
index 00000000..daef43df
--- /dev/null
+++ b/abc70930/src/aig/ivy/module.make
@@ -0,0 +1,22 @@
+SRC +=    src/aig/ivy/ivyBalance.c \
+    src/aig/ivy/ivyCanon.c \
+    src/aig/ivy/ivyCheck.c \
+    src/aig/ivy/ivyCut.c \
+    src/aig/ivy/ivyCutTrav.c \
+    src/aig/ivy/ivyDfs.c \
+    src/aig/ivy/ivyDsd.c \
+    src/aig/ivy/ivyFanout.c \
+    src/aig/ivy/ivyFastMap.c \
+    src/aig/ivy/ivyFraig.c \
+    src/aig/ivy/ivyHaig.c \
+    src/aig/ivy/ivyMan.c \
+    src/aig/ivy/ivyMem.c \
+    src/aig/ivy/ivyMulti.c \
+    src/aig/ivy/ivyObj.c \
+    src/aig/ivy/ivyOper.c \
+    src/aig/ivy/ivyResyn.c \
+    src/aig/ivy/ivyRwr.c \
+    src/aig/ivy/ivySeq.c \
+    src/aig/ivy/ivyShow.c \
+    src/aig/ivy/ivyTable.c \
+    src/aig/ivy/ivyUtil.c
diff --git a/abc70930/src/aig/kit/cloud.c b/abc70930/src/aig/kit/cloud.c
new file mode 100644
index 00000000..6e6691f0
--- /dev/null
+++ b/abc70930/src/aig/kit/cloud.c
@@ -0,0 +1,987 @@
+/**CFile****************************************************************
+
+  FileName    [cloudCore.c]
+
+  PackageName [Fast application-specific BDD package.]
+
+  Synopsis    [The package core.]
+
+  Author      [Alan Mishchenko <alanmi@ece.pdx.edu>]
+  
+  Affiliation [ECE Department. Portland State University, Portland, Oregon.]
+
+  Date        [Ver. 1.0. Started - June 10, 2002.]
+
+  Revision    [$Id: cloudCore.c,v 1.0 2002/06/10 03:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "cloud.h"
+
+// the number of operators using cache
+static int CacheOperNum = 4;
+
+// the ratio of cache size to the unique table size for each operator
+static int CacheLogRatioDefault[4] = {
+    2, // CLOUD_OPER_AND, 
+    8, // CLOUD_OPER_XOR, 
+    8, // CLOUD_OPER_BDIFF, 
+    8  // CLOUD_OPER_LEQ 
+};
+
+// the ratio of cache size to the unique table size for each operator
+static int CacheSize[4] = {
+    2, // CLOUD_OPER_AND, 
+    2, // CLOUD_OPER_XOR, 
+    2, // CLOUD_OPER_BDIFF, 
+    2  // CLOUD_OPER_LEQ 
+};
+
+////////////////////////////////////////////////////////////////////////
+///                       FUNCTION DECLARATIONS                      ///
+////////////////////////////////////////////////////////////////////////
+
+// static functions
+static CloudNode * cloudMakeNode( CloudManager * dd, CloudVar v, CloudNode * t, CloudNode * e );
+static void        cloudCacheAllocate( CloudManager * dd, CloudOper oper );
+
+////////////////////////////////////////////////////////////////////////
+///                       FUNCTION DEFINITIONS                       ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function********************************************************************
+
+  Synopsis    [Starts the cloud manager.]
+
+  Description [The first arguments is the number of elementary variables used.
+  The second arguments is the number of bits of the unsigned integer used to 
+  represent nodes in the unique table. If the second argument is 0, the package 
+  assumes 23 to represent nodes, which is equivalent to 2^23 = 8,388,608 nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudManager * Cloud_Init( int nVars, int nBits )
+{
+    CloudManager * dd;
+    int i;
+    int clk1, clk2;
+
+    assert( nVars <= 100000 );
+    assert( nBits < 32 );
+
+    // assign the defaults
+    if ( nBits == 0 )
+        nBits = CLOUD_NODE_BITS;
+
+    // start the manager
+    dd = CALLOC( CloudManager, 1 );
+    dd->nMemUsed          += sizeof(CloudManager);
+
+    // variables
+    dd->nVars             = nVars;              // the number of variables allocated
+    // bits
+    dd->bitsNode          = nBits;              // the number of bits used for the node
+    for ( i = 0; i < CacheOperNum; i++ )
+        dd->bitsCache[i]  = nBits - CacheLogRatioDefault[i];
+    // shifts
+    dd->shiftUnique       = 8*sizeof(unsigned) - (nBits + 1); // gets node index in the hash table
+    for ( i = 0; i < CacheOperNum; i++ )
+        dd->shiftCache[i] = 8*sizeof(unsigned) - dd->bitsCache[i];
+    // nodes
+    dd->nNodesAlloc       = (1 << (nBits + 1)); // 2 ^ (nBits + 1)
+    dd->nNodesLimit       = (1 << nBits);       // 2 ^  nBits
+
+    // unique table
+clk1 = clock();
+    dd->tUnique           = CALLOC( CloudNode, dd->nNodesAlloc );
+    dd->nMemUsed         += sizeof(CloudNode) * dd->nNodesAlloc;
+clk2 = clock();
+//PRT( "calloc() time", clk2 - clk1 ); 
+
+    // set up the constant node (the only node that is not in the hash table)
+    dd->nSignCur          = 1;
+    dd->tUnique[0].s      = dd->nSignCur;
+    dd->tUnique[0].v      = CLOUD_CONST_INDEX;
+    dd->tUnique[0].e      = CLOUD_VOID;
+    dd->tUnique[0].t      = CLOUD_VOID;
+    dd->one               = dd->tUnique;
+    dd->zero              = Cloud_Not(dd->one);
+    dd->nNodesCur         = 1;
+
+    // special nodes
+    dd->pNodeStart        = dd->tUnique + 1;
+    dd->pNodeEnd          = dd->tUnique + dd->nNodesAlloc;
+
+    // set up the elementary variables
+    dd->vars              = ALLOC( CloudNode *, dd->nVars );
+    dd->nMemUsed         += sizeof(CloudNode *) * dd->nVars;
+    for ( i = 0; i < dd->nVars; i++ )
+        dd->vars[i]   = cloudMakeNode( dd, i, dd->one, dd->zero );
+
+    return dd;
+};
+
+/**Function********************************************************************
+
+  Synopsis    [Stops the cloud manager.]
+
+  Description [The first arguments tells show many elementary variables are used.
+  The second arguments tells how many bits of the unsigned integer are used
+  to represent regular nodes in the unique table.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Cloud_Quit( CloudManager * dd )
+{
+    int i;
+    FREE( dd->ppNodes );
+    free( dd->tUnique ); 
+    free( dd->vars ); 
+    for ( i = 0; i < 4; i++ )
+        FREE( dd->tCaches[i] );
+    free( dd ); 
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Prepares the manager for another run.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Cloud_Restart( CloudManager * dd )
+{
+    int i;
+    assert( dd->one->s == dd->nSignCur );
+    dd->nSignCur++;
+    dd->one->s++;
+    for ( i = 0; i < dd->nVars; i++ )
+        dd->vars[i]->s++;
+    dd->nNodesCur = 1 + dd->nVars;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [This optional function allocates operation cache of the given size.]
+
+  Description [Cache for each operation is allocated independently when the first 
+  operation of the given type is performed. The user can allocate cache of his/her 
+  preferred size by calling Cloud_CacheAllocate before the first operation of the 
+  given type is performed, but this call is optional. Argument "logratio" gives
+  the binary logarithm of the ratio of the size of the unique table to that of cache.
+  For example, if "logratio" is equal to 3, and the unique table will be 2^3=8 times
+  larger than cache; so, if unique table is 2^23 = 8,388,608 nodes, the cache size 
+  will be 2^3=8 times smaller and equal to 2^20 = 1,048,576 entries.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Cloud_CacheAllocate( CloudManager * dd, CloudOper oper, int logratio )
+{
+    assert( logratio > 0 );            // cache cannot be larger than the unique table 
+    assert( logratio < dd->bitsNode ); // cache cannot be smaller than 2 entries
+
+    if ( logratio )
+    {
+        dd->bitsCache[oper]  = dd->bitsNode - logratio;
+        dd->shiftCache[oper] = 8*sizeof(unsigned) - dd->bitsCache[oper];
+    }
+    cloudCacheAllocate( dd, oper );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Internal cache allocation.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void cloudCacheAllocate( CloudManager * dd, CloudOper oper )
+{
+    int nCacheEntries = (1 << dd->bitsCache[oper]);
+
+    if ( CacheSize[oper] == 1 )
+    {
+        dd->tCaches[oper] = (CloudCacheEntry2 *)CALLOC( CloudCacheEntry1, nCacheEntries );
+        dd->nMemUsed     += sizeof(CloudCacheEntry1) * nCacheEntries;
+    }
+    else if ( CacheSize[oper] == 2 )
+    {
+        dd->tCaches[oper] = (CloudCacheEntry2 *)CALLOC( CloudCacheEntry2, nCacheEntries );
+        dd->nMemUsed     += sizeof(CloudCacheEntry2) * nCacheEntries;
+    }
+    else if ( CacheSize[oper] == 3 )
+    {
+        dd->tCaches[oper] = (CloudCacheEntry2 *)CALLOC( CloudCacheEntry3, nCacheEntries );
+        dd->nMemUsed     += sizeof(CloudCacheEntry3) * nCacheEntries;
+    }
+}
+
+
+
+/**Function********************************************************************
+
+  Synopsis    [Returns or creates a new node]
+
+  Description [Checks the unique table for the existance of the node. If the node is 
+  present, returns the node. If the node is absent, creates a new node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Cloud_MakeNode( CloudManager * dd, CloudVar v, CloudNode * t, CloudNode * e )
+{
+    CloudNode * pRes;
+    CLOUD_ASSERT(t); 
+    CLOUD_ASSERT(e);
+    assert( v < Cloud_V(t) && v < Cloud_V(e) );       // variable should be above in the order
+    if ( Cloud_IsComplement(t) )
+    {
+        pRes = cloudMakeNode( dd, v, Cloud_Not(t), Cloud_Not(e) );
+        if ( pRes != CLOUD_VOID )
+            pRes = Cloud_Not(pRes);            
+    }
+    else
+        pRes = cloudMakeNode( dd, v, t, e );
+    return pRes;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Returns or creates a new node]
+
+  Description [Checks the unique table for the existance of the node. If the node is 
+  present, returns the node. If the node is absent, creates a new node.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * cloudMakeNode( CloudManager * dd, CloudVar v, CloudNode * t, CloudNode * e )
+{
+    CloudNode * entryUnique;
+
+    CLOUD_ASSERT(t); 
+    CLOUD_ASSERT(e);
+
+    assert( ((int)v) >= 0 && ((int)v) < dd->nVars );  // the variable must be in the range
+    assert( v < Cloud_V(t) && v < Cloud_V(e) );       // variable should be above in the order
+    assert( !Cloud_IsComplement(t) );                 // the THEN edge must not be complemented
+
+    // make sure we are not searching for the constant node
+    assert( t && e );
+
+    // get the unique entry
+    entryUnique = dd->tUnique + cloudHashCudd3(v, t, e, dd->shiftUnique);
+    while ( entryUnique->s == dd->nSignCur )
+    {
+        // compare the node
+        if ( entryUnique->v == v && entryUnique->t == t && entryUnique->e == e )
+        { // the node is found
+            dd->nUniqueHits++;
+            return entryUnique;  // returns the node
+        }
+        // increment the hash value modulus the hash table size
+        if ( ++entryUnique - dd->tUnique == dd->nNodesAlloc )
+            entryUnique = dd->tUnique + 1;
+        // increment the number of steps through the table
+        dd->nUniqueSteps++;
+    }
+    dd->nUniqueMisses++;
+
+    // check if the new node can be created
+    if ( ++dd->nNodesCur == dd->nNodesLimit ) 
+    { // initiate the restart
+        printf( "Cloud needs restart!\n" );
+//        fflush( stdout );
+//        exit(1);
+        return CLOUD_VOID;
+    }
+    // create the node
+    entryUnique->s   = dd->nSignCur;
+    entryUnique->v   = v;
+    entryUnique->t   = t;
+    entryUnique->e   = e;
+    return entryUnique;  // returns the node
+}
+
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the AND or two BDDs]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * cloudBddAnd( CloudManager * dd, CloudNode * f, CloudNode * g )
+{
+    CloudNode * F, * G, * r;
+    CloudCacheEntry2 * cacheEntry;
+    CloudNode * fv, * fnv, * gv, * gnv, * t, * e;
+    CloudVar  var;
+
+    assert( f <= g );
+
+    // terminal cases
+    F = Cloud_Regular(f);
+    G = Cloud_Regular(g);
+    if ( F == G )
+    {
+        if ( f == g )
+            return f;
+        else
+            return dd->zero;
+    }
+    if ( F == dd->one )
+    {
+        if ( f == dd->one )
+            return g;
+        else
+            return f;
+    }
+
+    // check cache
+    cacheEntry = dd->tCaches[CLOUD_OPER_AND] + cloudHashCudd2(f, g, dd->shiftCache[CLOUD_OPER_AND]);
+//    cacheEntry = dd->tCaches[CLOUD_OPER_AND] + cloudHashBuddy2(f, g, dd->shiftCache[CLOUD_OPER_AND]);
+    r = cloudCacheLookup2( cacheEntry, dd->nSignCur, f, g );
+    if ( r != CLOUD_VOID )
+    {
+        dd->nCacheHits++;
+        return r;
+    }
+    dd->nCacheMisses++;
+
+
+    // compute cofactors
+    if ( cloudV(F) <= cloudV(G) )
+    {
+        var = cloudV(F);
+        if ( Cloud_IsComplement(f) )
+        {
+            fnv = Cloud_Not(cloudE(F));
+            fv  = Cloud_Not(cloudT(F));
+        }
+        else
+        {
+            fnv = cloudE(F);
+            fv  = cloudT(F);
+        }
+    }
+    else
+    {
+        var = cloudV(G);
+        fv  = fnv = f;
+    }
+
+    if ( cloudV(G) <= cloudV(F) )
+    {
+        if ( Cloud_IsComplement(g) )
+        {
+            gnv = Cloud_Not(cloudE(G));
+            gv  = Cloud_Not(cloudT(G));
+        }
+        else
+        {
+            gnv = cloudE(G);
+            gv  = cloudT(G);
+        }
+    }
+    else
+    {
+        gv = gnv = g;
+    }
+
+    if ( fv <= gv )
+        t = cloudBddAnd( dd, fv, gv );
+    else
+        t = cloudBddAnd( dd, gv, fv );
+
+    if ( t == CLOUD_VOID )
+        return CLOUD_VOID;
+
+    if ( fnv <= gnv )
+        e = cloudBddAnd( dd, fnv, gnv );
+    else
+        e = cloudBddAnd( dd, gnv, fnv );
+
+    if ( e == CLOUD_VOID )
+        return CLOUD_VOID;
+
+    if ( t == e )
+        r = t;
+    else
+    {
+        if ( Cloud_IsComplement(t) )
+        {
+            r = cloudMakeNode( dd, var, Cloud_Not(t), Cloud_Not(e) );
+            if ( r == CLOUD_VOID )
+                return CLOUD_VOID;
+            r = Cloud_Not(r);
+        }
+        else
+        {
+            r = cloudMakeNode( dd, var, t, e );
+            if ( r == CLOUD_VOID )
+                return CLOUD_VOID;
+        }
+    }
+    cloudCacheInsert2( cacheEntry, dd->nSignCur, f, g, r );
+    return r;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the AND or two BDDs]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+static inline CloudNode * cloudBddAnd_gate( CloudManager * dd, CloudNode * f, CloudNode * g )
+{
+    if ( f <= g )
+        return cloudBddAnd(dd,f,g);
+    else
+        return cloudBddAnd(dd,g,f);
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the AND or two BDDs]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Cloud_bddAnd( CloudManager * dd, CloudNode * f, CloudNode * g )
+{
+    if ( Cloud_Regular(f) == CLOUD_VOID || Cloud_Regular(g) == CLOUD_VOID )
+        return CLOUD_VOID;
+    CLOUD_ASSERT(f);
+    CLOUD_ASSERT(g);
+    if ( dd->tCaches[CLOUD_OPER_AND] == NULL )
+        cloudCacheAllocate( dd, CLOUD_OPER_AND );
+    return cloudBddAnd_gate( dd, f, g );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the OR or two BDDs]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Cloud_bddOr( CloudManager * dd, CloudNode * f, CloudNode * g )
+{
+    CloudNode * res;
+    if ( Cloud_Regular(f) == CLOUD_VOID || Cloud_Regular(g) == CLOUD_VOID )
+        return CLOUD_VOID;
+    CLOUD_ASSERT(f);
+    CLOUD_ASSERT(g);
+    if ( dd->tCaches[CLOUD_OPER_AND] == NULL )
+        cloudCacheAllocate( dd, CLOUD_OPER_AND );
+    res = cloudBddAnd_gate( dd, Cloud_Not(f), Cloud_Not(g) );
+    res = Cloud_NotCond( res, res != CLOUD_VOID );
+    return res;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the XOR or two BDDs]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Cloud_bddXor( CloudManager * dd, CloudNode * f, CloudNode * g )
+{
+    CloudNode * t0, * t1, * r;
+    if ( Cloud_Regular(f) == CLOUD_VOID || Cloud_Regular(g) == CLOUD_VOID )
+        return CLOUD_VOID;
+    CLOUD_ASSERT(f);
+    CLOUD_ASSERT(g);
+    if ( dd->tCaches[CLOUD_OPER_AND] == NULL )
+        cloudCacheAllocate( dd, CLOUD_OPER_AND );
+    t0 = cloudBddAnd_gate( dd, f, Cloud_Not(g) );
+    if ( t0 == CLOUD_VOID )
+        return CLOUD_VOID;
+    t1 = cloudBddAnd_gate( dd, Cloud_Not(f), g );
+    if ( t1 == CLOUD_VOID )
+        return CLOUD_VOID;
+    r  = Cloud_bddOr( dd, t0, t1 );
+    return r;
+}
+
+
+
+/**Function********************************************************************
+
+  Synopsis    [Performs a DFS from f, clearing the LSB of the next
+  pointers.]
+
+  Description []
+
+  SideEffects [None]
+
+  SeeAlso     [cloudSupport cloudDagSize]
+
+******************************************************************************/
+static void cloudClearMark( CloudManager * dd, CloudNode * n )
+{
+    if ( !cloudNodeIsMarked(n) )
+        return;
+    // clear visited flag
+    cloudNodeUnmark(n);
+    if ( cloudIsConstant(n) )
+        return;
+    cloudClearMark( dd, cloudT(n) );
+    cloudClearMark( dd, Cloud_Regular(cloudE(n)) );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the recursive step of Cloud_Support.]
+
+  Description [Performs the recursive step of Cloud_Support. Performs a
+  DFS from f. The support is accumulated in supp as a side effect. Uses
+  the LSB of the then pointer as visited flag.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+static void cloudSupport( CloudManager * dd, CloudNode * n, int * support )
+{
+    if ( cloudIsConstant(n) || cloudNodeIsMarked(n) )
+        return;
+    // set visited flag
+    cloudNodeMark(n);
+    support[cloudV(n)] = 1;
+    cloudSupport( dd, cloudT(n), support );
+    cloudSupport( dd, Cloud_Regular(cloudE(n)), support );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Finds the variables on which a DD depends.]
+
+  Description [Finds the variables on which a DD depends.
+  Returns a BDD consisting of the product of the variables if
+  successful; NULL otherwise.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Cloud_Support( CloudManager * dd, CloudNode * n )
+{
+    CloudNode * res;
+    int * support, i;
+
+    CLOUD_ASSERT(n);
+
+    // allocate and initialize support array for cloudSupport
+    support = CALLOC( int, dd->nVars );
+
+    // compute support and clean up markers
+    cloudSupport( dd, Cloud_Regular(n), support );
+    cloudClearMark( dd, Cloud_Regular(n) );
+
+    // transform support from array to cube
+    res = dd->one;
+    for ( i = dd->nVars - 1; i >= 0; i-- ) // for each level bottom-up 
+        if ( support[i] == 1 )
+        {
+            res = Cloud_bddAnd( dd, res, dd->vars[i] );
+            if ( res == CLOUD_VOID )
+                break;
+        }
+    FREE( support );
+    return res;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Counts the variables on which a DD depends.]
+
+  Description [Counts the variables on which a DD depends.
+  Returns the number of the variables if successful; Cloud_OUT_OF_MEM
+  otherwise.]
+
+  SideEffects [None]
+
+  SeeAlso     []
+
+******************************************************************************/
+int Cloud_SupportSize( CloudManager * dd, CloudNode * n )
+{
+    int * support, i, count;
+
+    CLOUD_ASSERT(n);
+
+    // allocate and initialize support array for cloudSupport
+    support = CALLOC( int, dd->nVars );
+
+    // compute support and clean up markers
+    cloudSupport( dd, Cloud_Regular(n), support );
+    cloudClearMark( dd, Cloud_Regular(n) );
+
+    // count support variables
+    count = 0;
+    for ( i = 0; i < dd->nVars; i++ )
+    {
+        if ( support[i] == 1 )
+            count++;
+    }
+
+    FREE( support );
+    return count;
+}
+
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the recursive step of Cloud_DagSize.]
+
+  Description [Performs the recursive step of Cloud_DagSize. Returns the
+  number of nodes in the graph rooted at n.]
+
+  SideEffects [None]
+
+******************************************************************************/
+static int cloudDagSize( CloudManager * dd, CloudNode * n )
+{
+    int tval, eval;
+    if ( cloudNodeIsMarked(n) )
+        return 0;
+    // set visited flag
+    cloudNodeMark(n);
+    if ( cloudIsConstant(n) )
+        return 1;
+    tval = cloudDagSize( dd, cloudT(n) );
+    eval = cloudDagSize( dd, Cloud_Regular(cloudE(n)) );
+    return tval + eval + 1;
+
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Counts the number of nodes in a DD.]
+
+  Description [Counts the number of nodes in a DD. Returns the number
+  of nodes in the graph rooted at node.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Cloud_DagSize( CloudManager * dd, CloudNode * n )
+{
+    int res;
+    res = cloudDagSize( dd, Cloud_Regular( n ) );
+    cloudClearMark( dd, Cloud_Regular( n ) );
+    return res;
+
+}
+
+
+/**Function********************************************************************
+
+  Synopsis    [Performs the recursive step of Cloud_DagSize.]
+
+  Description [Performs the recursive step of Cloud_DagSize. Returns the
+  number of nodes in the graph rooted at n.]
+
+  SideEffects [None]
+
+******************************************************************************/
+static int Cloud_DagCollect_rec( CloudManager * dd, CloudNode * n, int * pCounter )
+{
+    int tval, eval;
+    if ( cloudNodeIsMarked(n) )
+        return 0;
+    // set visited flag
+    cloudNodeMark(n);
+    if ( cloudIsConstant(n) )
+    {
+        dd->ppNodes[(*pCounter)++] = n;
+        return 1;
+    }
+    tval = Cloud_DagCollect_rec( dd, cloudT(n), pCounter );
+    eval = Cloud_DagCollect_rec( dd, Cloud_Regular(cloudE(n)), pCounter );
+    dd->ppNodes[(*pCounter)++] = n;
+    return tval + eval + 1;
+
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Counts the number of nodes in a DD.]
+
+  Description [Counts the number of nodes in a DD. Returns the number
+  of nodes in the graph rooted at node.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Cloud_DagCollect( CloudManager * dd, CloudNode * n )
+{
+    int res, Counter = 0;
+    if ( dd->ppNodes == NULL )
+        dd->ppNodes = ALLOC( CloudNode *, dd->nNodesLimit );
+    res = Cloud_DagCollect_rec( dd, Cloud_Regular( n ), &Counter );
+    cloudClearMark( dd, Cloud_Regular( n ) );
+    assert( res == Counter );
+    return res;
+
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Counts the number of nodes in an array of DDs.]
+
+  Description [Counts the number of nodes in a DD. Returns the number
+  of nodes in the graph rooted at node.]
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Cloud_SharingSize( CloudManager * dd, CloudNode ** pn, int nn )
+{
+    int res, i;
+    res = 0;
+    for ( i = 0; i < nn; i++ )
+        res += cloudDagSize( dd, Cloud_Regular( pn[i] ) );
+    for ( i = 0; i < nn; i++ )
+        cloudClearMark( dd, Cloud_Regular( pn[i] ) );
+    return res;
+}
+
+
+/**Function********************************************************************
+
+  Synopsis    [Returns one cube contained in the given BDD.]
+
+  Description []
+
+  SideEffects []
+
+******************************************************************************/
+CloudNode * Cloud_GetOneCube( CloudManager * dd, CloudNode * bFunc )
+{
+    CloudNode * bFunc0, * bFunc1, * res;
+
+    if ( Cloud_IsConstant(bFunc) )
+        return bFunc;
+
+    // cofactor
+    if ( Cloud_IsComplement(bFunc) )
+    {
+        bFunc0 = Cloud_Not( cloudE(bFunc) );
+        bFunc1 = Cloud_Not( cloudT(bFunc) );
+    }
+    else
+    {
+        bFunc0 = cloudE(bFunc);
+        bFunc1 = cloudT(bFunc);
+    }
+
+    // try to find the cube with the negative literal
+    res = Cloud_GetOneCube( dd, bFunc0 );
+    if ( res == CLOUD_VOID )
+        return CLOUD_VOID;
+
+    if ( res != dd->zero )
+    {
+        res = Cloud_bddAnd( dd, res, Cloud_Not(dd->vars[Cloud_V(bFunc)]) );
+    }
+    else
+    {
+        // try to find the cube with the positive literal
+        res = Cloud_GetOneCube( dd, bFunc1 );
+        if ( res == CLOUD_VOID )
+            return CLOUD_VOID;
+        assert( res != dd->zero );
+        res = Cloud_bddAnd( dd, res, dd->vars[Cloud_V(bFunc)] );
+    }
+    return res;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Prints the BDD as a set of disjoint cubes to the standard output.]
+
+  Description []
+
+  SideEffects []
+
+******************************************************************************/
+void Cloud_bddPrint( CloudManager * dd, CloudNode * Func )
+{
+    CloudNode * Cube;
+    int fFirst = 1;
+
+    if ( Func == dd->zero )
+        printf( "Constant 0." );
+    else if ( Func == dd->one )
+        printf( "Constant 1." );
+    else
+    {
+        while ( 1 )
+        {
+            Cube = Cloud_GetOneCube( dd, Func );
+            if ( Cube == CLOUD_VOID || Cube == dd->zero )
+                break;
+            if ( fFirst )       fFirst = 0;
+            else                printf( " + " );
+            Cloud_bddPrintCube( dd, Cube );
+            Func = Cloud_bddAnd( dd, Func, Cloud_Not(Cube) );
+        } 
+    }
+    printf( "\n" );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Prints one cube.]
+
+  Description []
+
+  SideEffects []
+
+******************************************************************************/
+void Cloud_bddPrintCube( CloudManager * dd, CloudNode * bCube )
+{
+    CloudNode * bCube0, * bCube1;
+
+    assert( !Cloud_IsConstant(bCube) );
+    while ( 1 )
+    {
+        // get the node structure
+        if ( Cloud_IsConstant(bCube) )
+            break;
+
+        // cofactor the cube
+        if ( Cloud_IsComplement(bCube) )
+        {
+            bCube0 = Cloud_Not( cloudE(bCube) );
+            bCube1 = Cloud_Not( cloudT(bCube) );
+        }
+        else
+        {
+            bCube0 = cloudE(bCube);
+            bCube1 = cloudT(bCube);
+        }
+
+        if ( bCube0 != dd->zero )
+        {
+            assert( bCube1 == dd->zero );
+            printf( "[%d]'", cloudV(bCube) );
+            bCube = bCube0;
+        }
+        else
+        {
+            assert( bCube1 != dd->zero );
+            printf( "[%d]", cloudV(bCube) );
+            bCube = bCube1;
+        }
+    }
+}
+
+
+/**Function********************************************************************
+
+  Synopsis    [Prints info.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Cloud_PrintInfo( CloudManager * dd )
+{
+    if ( dd == NULL ) return;
+    printf( "The number of unique table nodes allocated = %12d.\n", dd->nNodesAlloc );
+    printf( "The number of unique table nodes present   = %12d.\n", dd->nNodesCur );
+    printf( "The number of unique table hits            = %12d.\n", dd->nUniqueHits );
+    printf( "The number of unique table misses          = %12d.\n", dd->nUniqueMisses );
+    printf( "The number of unique table steps           = %12d.\n", dd->nUniqueSteps );
+    printf( "The number of cache hits                   = %12d.\n", dd->nCacheHits );
+    printf( "The number of cache misses                 = %12d.\n", dd->nCacheMisses );
+    printf( "The current signature                      = %12d.\n", dd->nSignCur );
+    printf( "The total memory in use                    = %12d.\n", dd->nMemUsed );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Prints the state of the hash table.]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Cloud_PrintHashTable( CloudManager * dd )
+{
+    int i;
+
+    for ( i = 0; i < dd->nNodesAlloc; i++ )
+        if ( dd->tUnique[i].v == CLOUD_CONST_INDEX )
+            printf( "-" );
+        else
+            printf( "+" );
+    printf( "\n" );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/kit/cloud.h b/abc70930/src/aig/kit/cloud.h
new file mode 100644
index 00000000..ac9d45f4
--- /dev/null
+++ b/abc70930/src/aig/kit/cloud.h
@@ -0,0 +1,269 @@
+/**CFile****************************************************************
+
+  FileName    [cloud.h]
+
+  PackageName [Fast application-specific BDD package.]
+
+  Synopsis    [Interface of the package.]
+
+  Author      [Alan Mishchenko <alanmi@ece.pdx.edu>]
+  
+  Affiliation [ECE Department. Portland State University, Portland, Oregon.]
+
+  Date        [Ver. 1.0. Started - June 10, 2002.]
+
+  Revision    [$Id: cloud.h,v 1.0 2002/06/10 03:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __CLOUD_H__
+#define __CLOUD_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <time.h>
+
+#ifdef _WIN32
+#define inline __inline // compatible with MS VS 6.0
+#endif
+
+////////////////////////////////////////////////////////////////////////
+//  n |  2^n ||  n |    2^n ||  n |        2^n ||  n |           2^n  //
+//====================================================================//
+//  1 |    2 ||  9 |    512 || 17 |    131,072 || 25 |    33,554,432  //
+//  2 |    4 || 10 |  1,024 || 18 |    262,144 || 26 |    67,108,864  // 
+//  3 |    8 || 11 |  2,048 || 19 |    524,288 || 27 |   134,217,728  //
+//  4 |   16 || 12 |  4,096 || 20 |  1,048,576 || 28 |   268,435,456  //
+//  5 |   32 || 13 |  8,192 || 21 |  2,097,152 || 29 |   536,870,912  //
+//  6 |   64 || 14 | 16,384 || 22 |  4,194,304 || 30 | 1,073,741,824  //
+//  7 |  128 || 15 | 32,768 || 23 |  8,388,608 || 31 | 2,147,483,648  //
+//  8 |  256 || 16 | 65,536 || 24 | 16,777,216 || 32 | 4,294,967,296  //
+////////////////////////////////////////////////////////////////////////
+
+// data structure typedefs
+typedef struct cloudManager       CloudManager;
+typedef unsigned                  CloudVar;
+typedef unsigned                  CloudSign;
+typedef struct cloudNode          CloudNode;
+typedef struct cloudCacheEntry1   CloudCacheEntry1;
+typedef struct cloudCacheEntry2   CloudCacheEntry2;
+typedef struct cloudCacheEntry3   CloudCacheEntry3;
+
+// operation codes used to set up the cache
+typedef enum { 
+    CLOUD_OPER_AND, 
+    CLOUD_OPER_XOR, 
+    CLOUD_OPER_BDIFF, 
+    CLOUD_OPER_LEQ 
+} CloudOper;
+
+/*
+// the number of operators using cache
+static int CacheOperNum = 4;
+
+// the ratio of cache size to the unique table size for each operator
+static int CacheLogRatioDefault[4] = {
+    4, // CLOUD_OPER_AND, 
+    8, // CLOUD_OPER_XOR, 
+    8, // CLOUD_OPER_BDIFF, 
+    8  // CLOUD_OPER_LEQ 
+};
+
+// the ratio of cache size to the unique table size for each operator
+static int CacheSize[4] = {
+    2, // CLOUD_OPER_AND, 
+    2, // CLOUD_OPER_XOR, 
+    2, // CLOUD_OPER_BDIFF, 
+    2  // CLOUD_OPER_LEQ 
+};
+*/
+
+// data structure definitions
+struct cloudManager            // the fast bdd manager     
+{
+    // variables
+    int nVars;                 // the number of variables allocated
+    // bits
+    int bitsNode;              // the number of bits used for the node
+    int bitsCache[4];          // default: bitsNode - CacheSizeRatio[i]
+    // shifts
+    int shiftUnique;           // 8*sizeof(unsigned) - (bitsNode + 1)
+    int shiftCache[4];         // 8*sizeof(unsigned) -  bitsCache[i]
+    // nodes 
+    int nNodesAlloc;           // 2 ^ (bitsNode + 1)
+    int nNodesLimit;           // 2 ^  bitsNode
+    int nNodesCur;             // the current number of nodes (including const1 and vars)
+    // signature
+    CloudSign nSignCur;
+
+    // statistics
+    int nMemUsed;              // memory usage in bytes
+    // cache stats
+    int nUniqueHits;           // hits in the unique table
+    int nUniqueMisses;         // misses in the unique table
+    int nCacheHits;            // hits in the caches
+    int nCacheMisses;          // misses in the caches
+    // the number of steps through the hash table
+    int nUniqueSteps;
+
+    // tables
+    CloudNode * tUnique;       // the unique table to store BDD nodes
+
+    // special nodes
+    CloudNode * pNodeStart;    // the pointer to the first node
+    CloudNode * pNodeEnd;      // the pointer to the first node out of the table
+
+    // constants and variables
+    CloudNode *  one;          // the one function
+    CloudNode *  zero;         // the zero function
+    CloudNode ** vars;         // the elementary variables
+
+    // temporary storage for nodes
+    CloudNode ** ppNodes;
+
+    // caches
+    CloudCacheEntry2 * tCaches[20];    // caches
+};
+
+struct cloudNode   // representation of the node in the unique table
+{
+    CloudSign   s;         // signature
+    CloudVar    v;         // variable
+    CloudNode * e;         // negative cofactor
+    CloudNode * t;         // positive cofactor
+};
+struct cloudCacheEntry1  // one-argument cache
+{
+    CloudSign   s;         // signature
+    CloudNode * a;         // argument 1
+    CloudNode * r;         // result
+};
+struct cloudCacheEntry2  // the two-argument cache
+{
+    CloudSign   s;         // signature
+    CloudNode * a;
+    CloudNode * b;
+    CloudNode * r;
+};
+struct cloudCacheEntry3  // the three-argument cache
+{
+    CloudSign   s;         // signature
+    CloudNode * a;
+    CloudNode * b;
+    CloudNode * c;
+    CloudNode * r;
+};
+
+
+// parameters
+#define CLOUD_NODE_BITS              23
+#define CLOUD_ONE                    ((unsigned)0x00000001)
+#define CLOUD_NOT_ONE                ((unsigned)0xfffffffe)
+#define CLOUD_VOID                   ((unsigned)0x00000000)
+
+#define CLOUD_CONST_INDEX            ((unsigned)0x0fffffff)
+#define CLOUD_MARK_ON                ((unsigned)0x10000000)
+#define CLOUD_MARK_OFF               ((unsigned)0xefffffff)
+
+// hash functions a la Buddy
+#define cloudHashBuddy2(x,y,s)       ((((x)+(y))*((x)+(y)+1)/2) & ((1<<(32-(s)))-1))
+#define cloudHashBuddy3(x,y,z,s)     (cloudHashBuddy2((cloudHashBuddy2((x),(y),(s))),(z),(s)) & ((1<<(32-(s)))-1))
+// hash functions a la Cudd
+#define DD_P1                           12582917
+#define DD_P2                         4256249
+#define DD_P3                         741457
+#define DD_P4                         1618033999
+#define cloudHashCudd2(f,g,s)        ((((unsigned)(f) * DD_P1 + (unsigned)(g)) * DD_P2) >> (s))
+#define cloudHashCudd3(f,g,h,s)      (((((unsigned)(f) * DD_P1 + (unsigned)(g)) * DD_P2 + (unsigned)(h)) * DD_P3) >> (s))
+
+// node complementation (using node)
+#define Cloud_Regular(p)             ((CloudNode*)(((unsigned)(p)) & CLOUD_NOT_ONE)) // get the regular node (w/o bubble)
+#define Cloud_Not(p)                 ((CloudNode*)(((unsigned)(p)) ^ CLOUD_ONE))     // complement the node
+#define Cloud_NotCond(p,c)           (((int)(c))? Cloud_Not(p):(p))                  // complement the node conditionally
+#define Cloud_IsComplement(p)        ((int)(((unsigned)(p)) & CLOUD_ONE))            // check if complemented
+// checking constants (using node)
+#define Cloud_IsConstant(p)          (((Cloud_Regular(p))->v & CLOUD_MARK_OFF) == CLOUD_CONST_INDEX)
+#define cloudIsConstant(p)           (((p)->v & CLOUD_MARK_OFF) == CLOUD_CONST_INDEX)
+
+// retrieving values from the node (using node structure)
+#define Cloud_V(p)                   ((Cloud_Regular(p))->v)
+#define Cloud_E(p)                   ((Cloud_Regular(p))->e)
+#define Cloud_T(p)                   ((Cloud_Regular(p))->t)
+// retrieving values from the regular node (using node structure)
+#define cloudV(p)                    ((p)->v)
+#define cloudE(p)                    ((p)->e)
+#define cloudT(p)                    ((p)->t)
+// marking/unmarking (using node structure)
+#define cloudNodeMark(p)             ((p)->v       |= CLOUD_MARK_ON)
+#define cloudNodeUnmark(p)           ((p)->v       &= CLOUD_MARK_OFF)
+#define cloudNodeIsMarked(p)         ((int)((p)->v &  CLOUD_MARK_ON))
+
+// cache lookups and inserts (using node)
+#define cloudCacheLookup1(p,sign,f)     (((p)->s == (sign) && (p)->a == (f))? ((p)->r): (CLOUD_VOID))
+#define cloudCacheLookup2(p,sign,f,g)   (((p)->s == (sign) && (p)->a == (f) && (p)->b == (g))? ((p)->r): (CLOUD_VOID))
+#define cloudCacheLookup3(p,sign,f,g,h) (((p)->s == (sign) && (p)->a == (f) && (p)->b == (g) && (p)->c == (h))? ((p)->r): (CLOUD_VOID))
+// cache inserts
+#define cloudCacheInsert1(p,sign,f,r)     (((p)->s = (sign)), ((p)->a = (f)), ((p)->r = (r)))
+#define cloudCacheInsert2(p,sign,f,g,r)   (((p)->s = (sign)), ((p)->a = (f)), ((p)->b = (g)), ((p)->r = (r)))
+#define cloudCacheInsert3(p,sign,f,g,h,r) (((p)->s = (sign)), ((p)->a = (f)), ((p)->b = (g)), ((p)->c = (h)), ((p)->r = (r)))
+
+//#define CLOUD_ASSERT(p)              (assert((p) >= (dd->pNodeStart-1) && (p) < dd->pNodeEnd))
+#define CLOUD_ASSERT(p)            assert((p) >= dd->tUnique && (p) < dd->tUnique+dd->nNodesAlloc)
+
+// utility macros
+#ifndef ALLOC
+#define ALLOC(type, num)           ((type *) malloc(sizeof(type) * (num)))
+#endif
+
+#ifndef CALLOC
+#define CALLOC(type, num)           ((type *) calloc((num), sizeof(type)))
+#endif
+
+#ifndef FREE
+#define FREE(obj)                   ((obj) ? (free((char *) (obj)), (obj) = 0) : 0)
+#endif
+
+#ifndef PRT
+#define PRT(a,t)                   fprintf( stdout, "%s = ", (a)); printf( "%.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC) )
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       FUNCTION DECLARATIONS                      ///
+////////////////////////////////////////////////////////////////////////
+// starting/stopping 
+extern CloudManager * Cloud_Init( int nVars, int nBits );
+extern void           Cloud_Quit( CloudManager * dd );
+extern void           Cloud_Restart( CloudManager * dd );
+extern void           Cloud_CacheAllocate( CloudManager * dd, CloudOper oper, int size );
+extern CloudNode *    Cloud_MakeNode( CloudManager * dd, CloudVar v, CloudNode * t, CloudNode * e );
+// support and node count
+extern CloudNode *    Cloud_Support( CloudManager * dd, CloudNode * n );
+extern int            Cloud_SupportSize( CloudManager * dd, CloudNode * n );
+extern int            Cloud_DagSize( CloudManager * dd, CloudNode * n );
+extern int            Cloud_DagCollect( CloudManager * dd, CloudNode * n );
+extern int            Cloud_SharingSize( CloudManager * dd, CloudNode * * pn, int nn );
+// cubes
+extern CloudNode *    Cloud_GetOneCube( CloudManager * dd, CloudNode * n );
+extern void           Cloud_bddPrint( CloudManager * dd, CloudNode * Func );
+extern void           Cloud_bddPrintCube( CloudManager * dd, CloudNode * Cube );
+// operations
+extern CloudNode *    Cloud_bddAnd( CloudManager * dd, CloudNode * f, CloudNode * g );
+extern CloudNode *    Cloud_bddOr( CloudManager * dd, CloudNode * f, CloudNode * g );
+// stats 
+extern void           Cloud_PrintInfo( CloudManager * dd );
+extern void           Cloud_PrintHashTable( CloudManager * dd );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                            END OF FILE                           ///
+////////////////////////////////////////////////////////////////////////
diff --git a/abc70930/src/aig/kit/kit.h b/abc70930/src/aig/kit/kit.h
new file mode 100644
index 00000000..06a93cf0
--- /dev/null
+++ b/abc70930/src/aig/kit/kit.h
@@ -0,0 +1,594 @@
+/**CFile****************************************************************
+
+  FileName    [kit.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kit.h,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __KIT_H__
+#define __KIT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <time.h>
+#include "vec.h"
+#include "extra.h"
+#include "cloud.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Kit_Sop_t_ Kit_Sop_t;
+struct Kit_Sop_t_
+{
+    int               nCubes;         // the number of cubes
+    unsigned *        pCubes;         // the storage for cubes
+};
+
+typedef struct Kit_Edge_t_ Kit_Edge_t;
+struct Kit_Edge_t_
+{
+    unsigned          fCompl   :  1;   // the complemented bit
+    unsigned          Node     : 30;   // the decomposition node pointed by the edge
+};
+
+typedef struct Kit_Node_t_ Kit_Node_t;
+struct Kit_Node_t_
+{
+    Kit_Edge_t        eEdge0;          // the left child of the node
+    Kit_Edge_t        eEdge1;          // the right child of the node
+    // other info
+    void *            pFunc;           // the function of the node (BDD or AIG)
+    unsigned          Level    : 14;   // the level of this node in the global AIG
+    // printing info 
+    unsigned          fNodeOr  :  1;   // marks the original OR node
+    unsigned          fCompl0  :  1;   // marks the original complemented edge
+    unsigned          fCompl1  :  1;   // marks the original complemented edge
+    // latch info
+    unsigned          nLat0    :  5;   // the number of latches on the first edge
+    unsigned          nLat1    :  5;   // the number of latches on the second edge
+    unsigned          nLat2    :  5;   // the number of latches on the output edge
+};
+
+typedef struct Kit_Graph_t_ Kit_Graph_t;
+struct Kit_Graph_t_
+{
+    int               fConst;          // marks the constant 1 graph
+    int               nLeaves;         // the number of leaves
+    int               nSize;           // the number of nodes (including the leaves) 
+    int               nCap;            // the number of allocated nodes
+    Kit_Node_t *      pNodes;          // the array of leaves and internal nodes
+    Kit_Edge_t        eRoot;           // the pointer to the topmost node
+};
+
+
+// DSD node types
+typedef enum { 
+    KIT_DSD_NONE  = 0,  // 0: unknown
+    KIT_DSD_CONST1,     // 1: constant 1
+    KIT_DSD_VAR,        // 2: elementary variable
+    KIT_DSD_AND,        // 3: multi-input AND
+    KIT_DSD_XOR,        // 4: multi-input XOR
+    KIT_DSD_PRIME       // 5: arbitrary function of 3+ variables
+} Kit_Dsd_t;
+
+// DSD node
+typedef struct Kit_DsdObj_t_ Kit_DsdObj_t;
+struct Kit_DsdObj_t_
+{ 
+    unsigned       Id         : 6;  // the number of this node
+    unsigned       Type       : 3;  // none, const, var, AND, XOR, MUX, PRIME
+    unsigned       fMark      : 1;  // finished checking output
+    unsigned       Offset     : 8;  // offset to the truth table
+    unsigned       nRefs      : 8;  // offset to the truth table
+    unsigned       nFans      : 6;  // the number of fanins of this node
+    unsigned char  pFans[0];        // the fanin literals
+};
+
+// DSD network
+typedef struct Kit_DsdNtk_t_ Kit_DsdNtk_t;
+struct Kit_DsdNtk_t_
+{
+    unsigned char  nVars;           // at most 16 (perhaps 18?)
+    unsigned char  nNodesAlloc;     // the number of allocated nodes (at most nVars)
+    unsigned char  nNodes;          // the number of nodes
+    unsigned char  Root;            // the root of the tree
+    unsigned *     pMem;            // memory for the truth tables (memory manager?)
+    unsigned *     pSupps;          // supports of the nodes
+    Kit_DsdObj_t** pNodes;          // the nodes
+};
+
+// DSD manager
+typedef struct Kit_DsdMan_t_ Kit_DsdMan_t;
+struct Kit_DsdMan_t_
+{
+    int            nVars;           // the maximum number of variables
+    int            nWords;          // the number of words in TTs
+    Vec_Ptr_t *    vTtElems;        // elementary truth tables
+    Vec_Ptr_t *    vTtNodes;        // the node truth tables
+    // BDD representation
+    CloudManager * dd;              // BDD package
+    Vec_Ptr_t *    vTtBdds;         // the node truth tables
+    Vec_Int_t *    vNodes;          // temporary array for BDD nodes
+};
+
+static inline int             Kit_DsdVar2Lit( int Var, int fCompl )  { return Var + Var + fCompl; }
+static inline int             Kit_DsdLit2Var( int Lit )              { return Lit >> 1;           }
+static inline int             Kit_DsdLitIsCompl( int Lit )           { return Lit & 1;            }
+static inline int             Kit_DsdLitNot( int Lit )               { return Lit ^ 1;            }
+static inline int             Kit_DsdLitNotCond( int Lit, int c )    { return Lit ^ (int)(c > 0); }
+static inline int             Kit_DsdLitRegular( int Lit )           { return Lit & 0xfe;         }
+ 
+static inline unsigned        Kit_DsdObjOffset( int nFans )          { return (nFans >> 2) + ((nFans & 3) > 0);                    }
+static inline unsigned *      Kit_DsdObjTruth( Kit_DsdObj_t * pObj ) { return pObj->Type == KIT_DSD_PRIME ? (unsigned *)pObj->pFans + pObj->Offset: NULL; }
+static inline int             Kit_DsdNtkObjNum( Kit_DsdNtk_t * pNtk ){ return pNtk->nVars + pNtk->nNodes; }
+static inline Kit_DsdObj_t *  Kit_DsdNtkObj( Kit_DsdNtk_t * pNtk, int Id )      { assert( Id >= 0 && Id < pNtk->nVars + pNtk->nNodes ); return Id < pNtk->nVars ? NULL : pNtk->pNodes[Id - pNtk->nVars]; }
+static inline Kit_DsdObj_t *  Kit_DsdNtkRoot( Kit_DsdNtk_t * pNtk )             { return Kit_DsdNtkObj( pNtk, Kit_DsdLit2Var(pNtk->Root) );                      }
+static inline int             Kit_DsdLitIsLeaf( Kit_DsdNtk_t * pNtk, int Lit )   { int Id = Kit_DsdLit2Var(Lit); assert( Id >= 0 && Id < pNtk->nVars + pNtk->nNodes ); return Id < pNtk->nVars; }
+static inline unsigned        Kit_DsdLitSupport( Kit_DsdNtk_t * pNtk, int Lit )  { int Id = Kit_DsdLit2Var(Lit); assert( Id >= 0 && Id < pNtk->nVars + pNtk->nNodes ); return pNtk->pSupps? (Id < pNtk->nVars? (1 << Id) : pNtk->pSupps[Id - pNtk->nVars]) : 0; }
+
+#define Kit_DsdNtkForEachObj( pNtk, pObj, i )                                      \
+    for ( i = 0; (i < (pNtk)->nNodes) && ((pObj) = (pNtk)->pNodes[i]); i++ )
+#define Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )                              \
+    for ( i = 0; (i < (pObj)->nFans) && ((iLit) = (pObj)->pFans[i], 1); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+#define KIT_MIN(a,b)       (((a) < (b))? (a) : (b))
+#define KIT_MAX(a,b)       (((a) > (b))? (a) : (b))
+#define KIT_INFINITY       (100000000)
+
+#ifndef ALLOC
+#define ALLOC(type, num)     ((type *) malloc(sizeof(type) * (num)))
+#endif
+
+#ifndef FREE
+#define FREE(obj)             ((obj) ? (free((char *) (obj)), (obj) = 0) : 0)
+#endif
+
+#ifndef REALLOC
+#define REALLOC(type, obj, num)    \
+        ((obj) ? ((type *) realloc((char *)(obj), sizeof(type) * (num))) : \
+         ((type *) malloc(sizeof(type) * (num))))
+#endif
+
+static inline int          Kit_CubeHasLit( unsigned uCube, int i )                        { return(uCube &  (unsigned)(1<<i)) > 0;  }
+static inline unsigned     Kit_CubeSetLit( unsigned uCube, int i )                        { return uCube |  (unsigned)(1<<i);       }
+static inline unsigned     Kit_CubeXorLit( unsigned uCube, int i )                        { return uCube ^  (unsigned)(1<<i);       }
+static inline unsigned     Kit_CubeRemLit( unsigned uCube, int i )                        { return uCube & ~(unsigned)(1<<i);       }
+
+static inline int          Kit_CubeContains( unsigned uLarge, unsigned uSmall )           { return (uLarge & uSmall) == uSmall;     }
+static inline unsigned     Kit_CubeSharp( unsigned uCube, unsigned uMask )                { return uCube & ~uMask;                  }
+static inline unsigned     Kit_CubeMask( int nVar )                                       { return (~(unsigned)0) >> (32-nVar);     }
+
+static inline int          Kit_CubeIsMarked( unsigned uCube )                             { return Kit_CubeHasLit( uCube, 31 );     }
+static inline unsigned     Kit_CubeMark( unsigned uCube )                                 { return Kit_CubeSetLit( uCube, 31 );     }
+static inline unsigned     Kit_CubeUnmark( unsigned uCube )                               { return Kit_CubeRemLit( uCube, 31 );     }
+
+static inline int          Kit_SopCubeNum( Kit_Sop_t * cSop )                             { return cSop->nCubes;                    }
+static inline unsigned     Kit_SopCube( Kit_Sop_t * cSop, int i )                         { return cSop->pCubes[i];                 }
+static inline void         Kit_SopShrink( Kit_Sop_t * cSop, int nCubesNew )               { cSop->nCubes = nCubesNew;               }
+static inline void         Kit_SopPushCube( Kit_Sop_t * cSop, unsigned uCube )            { cSop->pCubes[cSop->nCubes++] = uCube;   }
+static inline void         Kit_SopWriteCube( Kit_Sop_t * cSop, unsigned uCube, int i )    { cSop->pCubes[i] = uCube;                }
+
+static inline Kit_Edge_t   Kit_EdgeCreate( int Node, int fCompl )                         { Kit_Edge_t eEdge = { fCompl, Node }; return eEdge;  }
+static inline unsigned     Kit_EdgeToInt( Kit_Edge_t eEdge )                              { return (eEdge.Node << 1) | eEdge.fCompl;            }
+static inline Kit_Edge_t   Kit_IntToEdge( unsigned Edge )                                 { return Kit_EdgeCreate( Edge >> 1, Edge & 1 );       }
+static inline unsigned     Kit_EdgeToInt_( Kit_Edge_t eEdge )                             { return *(unsigned *)&eEdge;                         }
+static inline Kit_Edge_t   Kit_IntToEdge_( unsigned Edge )                                { return *(Kit_Edge_t *)&Edge;                        }
+
+static inline int          Kit_GraphIsConst( Kit_Graph_t * pGraph )                       { return pGraph->fConst;                              }
+static inline int          Kit_GraphIsConst0( Kit_Graph_t * pGraph )                      { return pGraph->fConst && pGraph->eRoot.fCompl;      }
+static inline int          Kit_GraphIsConst1( Kit_Graph_t * pGraph )                      { return pGraph->fConst && !pGraph->eRoot.fCompl;     }
+static inline int          Kit_GraphIsComplement( Kit_Graph_t * pGraph )                  { return pGraph->eRoot.fCompl;                        }
+static inline int          Kit_GraphIsVar( Kit_Graph_t * pGraph )                         { return pGraph->eRoot.Node < (unsigned)pGraph->nLeaves; }
+static inline void         Kit_GraphComplement( Kit_Graph_t * pGraph )                    { pGraph->eRoot.fCompl ^= 1;                          }
+static inline void         Kit_GraphSetRoot( Kit_Graph_t * pGraph, Kit_Edge_t eRoot )     { pGraph->eRoot = eRoot;                              }
+static inline int          Kit_GraphLeaveNum( Kit_Graph_t * pGraph )                      { return pGraph->nLeaves;                             }
+static inline int          Kit_GraphNodeNum( Kit_Graph_t * pGraph )                       { return pGraph->nSize - pGraph->nLeaves;             }
+static inline Kit_Node_t * Kit_GraphNode( Kit_Graph_t * pGraph, int i )                   { return pGraph->pNodes + i;                          }
+static inline Kit_Node_t * Kit_GraphNodeLast( Kit_Graph_t * pGraph )                      { return pGraph->pNodes + pGraph->nSize - 1;          }
+static inline int          Kit_GraphNodeInt( Kit_Graph_t * pGraph, Kit_Node_t * pNode )   { return pNode - pGraph->pNodes;                      }
+static inline int          Kit_GraphNodeIsVar( Kit_Graph_t * pGraph, Kit_Node_t * pNode ) { return Kit_GraphNodeInt(pGraph,pNode) < pGraph->nLeaves; }
+static inline Kit_Node_t * Kit_GraphVar( Kit_Graph_t * pGraph )                           { assert( Kit_GraphIsVar( pGraph ) );    return Kit_GraphNode( pGraph, pGraph->eRoot.Node );      }
+static inline int          Kit_GraphVarInt( Kit_Graph_t * pGraph )                        { assert( Kit_GraphIsVar( pGraph ) );    return Kit_GraphNodeInt( pGraph, Kit_GraphVar(pGraph) ); }
+static inline Kit_Node_t * Kit_GraphNodeFanin0( Kit_Graph_t * pGraph, Kit_Node_t * pNode ){ return Kit_GraphNodeIsVar(pGraph, pNode)? NULL : Kit_GraphNode(pGraph, pNode->eEdge0.Node);     }
+static inline Kit_Node_t * Kit_GraphNodeFanin1( Kit_Graph_t * pGraph, Kit_Node_t * pNode ){ return Kit_GraphNodeIsVar(pGraph, pNode)? NULL : Kit_GraphNode(pGraph, pNode->eEdge1.Node);     }
+static inline int          Kit_GraphRootLevel( Kit_Graph_t * pGraph )                     { return Kit_GraphNode(pGraph, pGraph->eRoot.Node)->Level;                                        }
+
+static inline int          Kit_Float2Int( float Val )     { return *((int *)&Val);               }
+static inline float        Kit_Int2Float( int Num )       { return *((float *)&Num);             }
+static inline int          Kit_BitWordNum( int nBits )    { return nBits/(8*sizeof(unsigned)) + ((nBits%(8*sizeof(unsigned))) > 0); }
+static inline int          Kit_TruthWordNum( int nVars )  { return nVars <= 5 ? 1 : (1 << (nVars - 5));                             }
+static inline unsigned     Kit_BitMask( int nBits )       { assert( nBits <= 32 ); return ~((~(unsigned)0) << nBits);               }
+
+static inline void         Kit_TruthSetBit( unsigned * p, int Bit )   { p[Bit>>5] |= (1<<(Bit & 31));               }
+static inline void         Kit_TruthXorBit( unsigned * p, int Bit )   { p[Bit>>5] ^= (1<<(Bit & 31));               }
+static inline int          Kit_TruthHasBit( unsigned * p, int Bit )   { return (p[Bit>>5] & (1<<(Bit & 31))) > 0;   }
+
+static inline int Kit_WordFindFirstBit( unsigned uWord )
+{
+    int i;
+    for ( i = 0; i < 32; i++ )
+        if ( uWord & (1 << i) )
+            return i;
+    return -1;
+}
+static inline int Kit_WordHasOneBit( unsigned uWord )
+{
+    return (uWord & (uWord - 1)) == 0;
+}
+static inline int Kit_WordCountOnes( unsigned uWord )
+{
+    uWord = (uWord & 0x55555555) + ((uWord>>1) & 0x55555555);
+    uWord = (uWord & 0x33333333) + ((uWord>>2) & 0x33333333);
+    uWord = (uWord & 0x0F0F0F0F) + ((uWord>>4) & 0x0F0F0F0F);
+    uWord = (uWord & 0x00FF00FF) + ((uWord>>8) & 0x00FF00FF);
+    return  (uWord & 0x0000FFFF) + (uWord>>16);
+}
+static inline int Kit_TruthCountOnes( unsigned * pIn, int nVars )
+{
+    int w, Counter = 0;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        Counter += Kit_WordCountOnes(pIn[w]);
+    return Counter;
+}
+static inline int Kit_TruthFindFirstBit( unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = 0; w < Kit_TruthWordNum(nVars); w++ )
+        if ( pIn[w] )
+            return 32*w + Kit_WordFindFirstBit(pIn[w]);
+    return -1;
+}
+static inline int Kit_TruthFindFirstZero( unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = 0; w < Kit_TruthWordNum(nVars); w++ )
+        if ( ~pIn[w] )
+            return 32*w + Kit_WordFindFirstBit(~pIn[w]);
+    return -1;
+}
+static inline int Kit_TruthIsEqual( unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn0[w] != pIn1[w] )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsOpposite( unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn0[w] != ~pIn1[w] )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsEqualWithPhase( unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    if ( (pIn0[0] & 1) == (pIn1[0] & 1) )
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            if ( pIn0[w] != pIn1[w] )
+                return 0;
+    }
+    else
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            if ( pIn0[w] != ~pIn1[w] )
+                return 0;
+    }
+    return 1;
+}
+static inline int Kit_TruthIsConst0( unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn[w] )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsConst1( unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn[w] != ~(unsigned)0 )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsImply( unsigned * pIn1, unsigned * pIn2, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn1[w] & ~pIn2[w] )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsDisjoint( unsigned * pIn1, unsigned * pIn2, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn1[w] & pIn2[w] )
+            return 0;
+    return 1;
+}
+static inline int Kit_TruthIsDisjoint3( unsigned * pIn1, unsigned * pIn2, unsigned * pIn3, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        if ( pIn1[w] & pIn2[w] & pIn3[w] )
+            return 0;
+    return 1;
+}
+static inline void Kit_TruthCopy( unsigned * pOut, unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = pIn[w];
+}
+static inline void Kit_TruthClear( unsigned * pOut, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = 0;
+}
+static inline void Kit_TruthFill( unsigned * pOut, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = ~(unsigned)0;
+}
+static inline void Kit_TruthNot( unsigned * pOut, unsigned * pIn, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = ~pIn[w];
+}
+static inline void Kit_TruthAnd( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = pIn0[w] & pIn1[w];
+}
+static inline void Kit_TruthOr( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = pIn0[w] | pIn1[w];
+}
+static inline void Kit_TruthXor( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = pIn0[w] ^ pIn1[w];
+}
+static inline void Kit_TruthSharp( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = pIn0[w] & ~pIn1[w];
+}
+static inline void Kit_TruthNand( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = ~(pIn0[w] & pIn1[w]);
+}
+static inline void Kit_TruthAndPhase( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, int nVars, int fCompl0, int fCompl1 )
+{
+    int w;
+    if ( fCompl0 && fCompl1 )
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = ~(pIn0[w] | pIn1[w]);
+    }
+    else if ( fCompl0 && !fCompl1 )
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = ~pIn0[w] & pIn1[w];
+    }
+    else if ( !fCompl0 && fCompl1 )
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = pIn0[w] & ~pIn1[w];
+    }
+    else // if ( !fCompl0 && !fCompl1 )
+    {
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = pIn0[w] & pIn1[w];
+    }
+}
+static inline void Kit_TruthMux( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, unsigned * pCtrl, int nVars )
+{
+    int w;
+    for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+        pOut[w] = (pIn0[w] & ~pCtrl[w]) | (pIn1[w] & pCtrl[w]);
+}
+static inline void Kit_TruthMuxPhase( unsigned * pOut, unsigned * pIn0, unsigned * pIn1, unsigned * pCtrl, int nVars, int fComp0 )
+{
+    int w;
+    if ( fComp0 )
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = (~pIn0[w] & ~pCtrl[w]) | (pIn1[w] & pCtrl[w]);
+    else
+        for ( w = Kit_TruthWordNum(nVars)-1; w >= 0; w-- )
+            pOut[w] = (pIn0[w] & ~pCtrl[w]) | (pIn1[w] & pCtrl[w]);
+}
+static inline void Kit_TruthIthVar( unsigned * pTruth, int nVars, int iVar )
+{
+    unsigned Masks[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    int k, nWords = (nVars <= 5 ? 1 : (1 << (nVars - 5)));
+    if ( iVar < 5 )
+    {
+        for ( k = 0; k < nWords; k++ )
+            pTruth[k] = Masks[iVar];
+    }
+    else
+    {
+        for ( k = 0; k < nWords; k++ )
+            if ( k & (1 << (iVar-5)) )
+                pTruth[k] = ~(unsigned)0;
+            else
+                pTruth[k] = 0;
+    }
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                           ITERATORS                              ///
+////////////////////////////////////////////////////////////////////////
+
+#define Kit_SopForEachCube( cSop, uCube, i )                                      \
+    for ( i = 0; (i < Kit_SopCubeNum(cSop)) && ((uCube) = Kit_SopCube(cSop, i)); i++ )
+#define Kit_CubeForEachLiteral( uCube, Lit, nLits, i )                            \
+    for ( i = 0; (i < (nLits)) && ((Lit) = Kit_CubeHasLit(uCube, i)); i++ )
+
+#define Kit_GraphForEachLeaf( pGraph, pLeaf, i )                                              \
+    for ( i = 0; (i < (pGraph)->nLeaves) && (((pLeaf) = Kit_GraphNode(pGraph, i)), 1); i++ )
+#define Kit_GraphForEachNode( pGraph, pAnd, i )                                               \
+    for ( i = (pGraph)->nLeaves; (i < (pGraph)->nSize) && (((pAnd) = Kit_GraphNode(pGraph, i)), 1); i++ )
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== kitBdd.c ==========================================================*/
+extern DdNode *        Kit_SopToBdd( DdManager * dd, Kit_Sop_t * cSop, int nVars );
+extern DdNode *        Kit_GraphToBdd( DdManager * dd, Kit_Graph_t * pGraph );
+extern DdNode *        Kit_TruthToBdd( DdManager * dd, unsigned * pTruth, int nVars, int fMSBonTop );
+/*=== kitCloud.c ==========================================================*/
+extern CloudNode *     Kit_TruthToCloud( CloudManager * dd, unsigned * pTruth, int nVars );
+extern unsigned *      Kit_CloudToTruth( Vec_Int_t * vNodes, int nVars, Vec_Ptr_t * vStore, int fInv );
+extern int             Kit_CreateCloud( CloudManager * dd, CloudNode * pFunc, Vec_Int_t * vNodes );
+extern int             Kit_CreateCloudFromTruth( CloudManager * dd, unsigned * pTruth, int nVars, Vec_Int_t * vNodes );
+extern unsigned *      Kit_TruthCompose( CloudManager * dd, unsigned * pTruth, int nVars, unsigned ** pInputs, int nVarsAll, Vec_Ptr_t * vStore, Vec_Int_t * vNodes );
+extern void            Kit_TruthCofSupports( Vec_Int_t * vBddDir, Vec_Int_t * vBddInv, int nVars, Vec_Int_t * vMemory, unsigned * puSupps );
+/*=== kitDsd.c ==========================================================*/
+extern Kit_DsdMan_t *  Kit_DsdManAlloc( int nVars, int nNodes );
+extern void            Kit_DsdManFree( Kit_DsdMan_t * p );
+extern Kit_DsdNtk_t *  Kit_DsdDeriveNtk( unsigned * pTruth, int nVars, int nLutSize );
+extern unsigned *      Kit_DsdTruthCompute( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk );
+extern void            Kit_DsdTruth( Kit_DsdNtk_t * pNtk, unsigned * pTruthRes );
+extern void            Kit_DsdTruthPartial( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned * pTruthRes, unsigned uSupp );
+extern void            Kit_DsdTruthPartialTwo( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned uSupp, int iVar, unsigned * pTruthCo, unsigned * pTruthDec );
+extern void            Kit_DsdPrint( FILE * pFile, Kit_DsdNtk_t * pNtk );
+extern void            Kit_DsdPrintExpanded( Kit_DsdNtk_t * pNtk );
+extern void            Kit_DsdPrintFromTruth( unsigned * pTruth, int nVars );
+extern Kit_DsdNtk_t *  Kit_DsdDecompose( unsigned * pTruth, int nVars );
+extern Kit_DsdNtk_t *  Kit_DsdDecomposeExpand( unsigned * pTruth, int nVars );
+extern Kit_DsdNtk_t *  Kit_DsdDecomposeMux( unsigned * pTruth, int nVars, int nDecMux );
+extern void            Kit_DsdVerify( Kit_DsdNtk_t * pNtk, unsigned * pTruth, int nVars );
+extern void            Kit_DsdNtkFree( Kit_DsdNtk_t * pNtk );
+extern int             Kit_DsdNonDsdSizeMax( Kit_DsdNtk_t * pNtk );
+extern unsigned        Kit_DsdNonDsdSupports( Kit_DsdNtk_t * pNtk );
+extern unsigned        Kit_DsdGetSupports( Kit_DsdNtk_t * p );
+extern Kit_DsdNtk_t *  Kit_DsdExpand( Kit_DsdNtk_t * p );
+extern Kit_DsdNtk_t *  Kit_DsdShrink( Kit_DsdNtk_t * p, int pPrios[] );
+extern void            Kit_DsdRotate( Kit_DsdNtk_t * p, int pFreqs[] );
+extern int             Kit_DsdCofactoring( unsigned * pTruth, int nVars, int * pCofVars, int nLimit, int fVerbose );
+/*=== kitFactor.c ==========================================================*/
+extern Kit_Graph_t *   Kit_SopFactor( Vec_Int_t * vCover, int fCompl, int nVars, Vec_Int_t * vMemory );
+/*=== kitGraph.c ==========================================================*/
+extern Kit_Graph_t *   Kit_GraphCreate( int nLeaves );   
+extern Kit_Graph_t *   Kit_GraphCreateConst0();   
+extern Kit_Graph_t *   Kit_GraphCreateConst1();   
+extern Kit_Graph_t *   Kit_GraphCreateLeaf( int iLeaf, int nLeaves, int fCompl );   
+extern void            Kit_GraphFree( Kit_Graph_t * pGraph );   
+extern Kit_Node_t *    Kit_GraphAppendNode( Kit_Graph_t * pGraph );   
+extern Kit_Edge_t      Kit_GraphAddNodeAnd( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1 );
+extern Kit_Edge_t      Kit_GraphAddNodeOr( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1 );
+extern Kit_Edge_t      Kit_GraphAddNodeXor( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1, int Type );
+extern Kit_Edge_t      Kit_GraphAddNodeMux( Kit_Graph_t * pGraph, Kit_Edge_t eEdgeC, Kit_Edge_t eEdgeT, Kit_Edge_t eEdgeE, int Type );
+extern unsigned        Kit_GraphToTruth( Kit_Graph_t * pGraph );
+extern Kit_Graph_t *   Kit_TruthToGraph( unsigned * pTruth, int nVars, Vec_Int_t * vMemory );
+extern int             Kit_GraphLeafDepth_rec( Kit_Graph_t * pGraph, Kit_Node_t * pNode, Kit_Node_t * pLeaf );
+/*=== kitHop.c ==========================================================*/
+//extern Hop_Obj_t *     Kit_GraphToHop( Hop_Man_t * pMan, Kit_Graph_t * pGraph );
+//extern Hop_Obj_t *     Kit_TruthToHop( Hop_Man_t * pMan, unsigned * pTruth, int nVars, Vec_Int_t * vMemory );
+//extern Hop_Obj_t *     Kit_CoverToHop( Hop_Man_t * pMan, Vec_Int_t * vCover, int nVars, Vec_Int_t * vMemory );
+/*=== kitIsop.c ==========================================================*/
+extern int             Kit_TruthIsop( unsigned * puTruth, int nVars, Vec_Int_t * vMemory, int fTryBoth );
+/*=== kitSop.c ==========================================================*/
+extern void            Kit_SopCreate( Kit_Sop_t * cResult, Vec_Int_t * vInput, int nVars, Vec_Int_t * vMemory );
+extern void            Kit_SopCreateInverse( Kit_Sop_t * cResult, Vec_Int_t * vInput, int nVars, Vec_Int_t * vMemory );
+extern void            Kit_SopDup( Kit_Sop_t * cResult, Kit_Sop_t * cSop, Vec_Int_t * vMemory );
+extern void            Kit_SopDivideByLiteralQuo( Kit_Sop_t * cSop, int iLit );
+extern void            Kit_SopDivideByCube( Kit_Sop_t * cSop, Kit_Sop_t * cDiv, Kit_Sop_t * vQuo, Kit_Sop_t * vRem, Vec_Int_t * vMemory );
+extern void            Kit_SopDivideInternal( Kit_Sop_t * cSop, Kit_Sop_t * cDiv, Kit_Sop_t * vQuo, Kit_Sop_t * vRem, Vec_Int_t * vMemory );
+extern void            Kit_SopMakeCubeFree( Kit_Sop_t * cSop );
+extern int             Kit_SopIsCubeFree( Kit_Sop_t * cSop );
+extern void            Kit_SopCommonCubeCover( Kit_Sop_t * cResult, Kit_Sop_t * cSop, Vec_Int_t * vMemory );
+extern int             Kit_SopAnyLiteral( Kit_Sop_t * cSop, int nLits );
+extern int             Kit_SopDivisor( Kit_Sop_t * cResult, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory );
+extern void            Kit_SopBestLiteralCover( Kit_Sop_t * cResult, Kit_Sop_t * cSop, unsigned uCube, int nLits, Vec_Int_t * vMemory );
+/*=== kitTruth.c ==========================================================*/
+extern void            Kit_TruthSwapAdjacentVars( unsigned * pOut, unsigned * pIn, int nVars, int Start );
+extern void            Kit_TruthStretch( unsigned * pOut, unsigned * pIn, int nVars, int nVarsAll, unsigned Phase, int fReturnIn );
+extern void            Kit_TruthShrink( unsigned * pOut, unsigned * pIn, int nVars, int nVarsAll, unsigned Phase, int fReturnIn );
+extern int             Kit_TruthVarInSupport( unsigned * pTruth, int nVars, int iVar );
+extern int             Kit_TruthSupportSize( unsigned * pTruth, int nVars );
+extern unsigned        Kit_TruthSupport( unsigned * pTruth, int nVars );
+extern void            Kit_TruthCofactor0( unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthCofactor1( unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthCofactor0New( unsigned * pOut, unsigned * pIn, int nVars, int iVar );
+extern void            Kit_TruthCofactor1New( unsigned * pOut, unsigned * pIn, int nVars, int iVar );
+extern void            Kit_TruthExist( unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthExistNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthExistSet( unsigned * pRes, unsigned * pTruth, int nVars, unsigned uMask );
+extern void            Kit_TruthForall( unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthForallNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthForallSet( unsigned * pRes, unsigned * pTruth, int nVars, unsigned uMask );
+extern void            Kit_TruthUniqueNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar );
+extern void            Kit_TruthMuxVar( unsigned * pOut, unsigned * pCof0, unsigned * pCof1, int nVars, int iVar );
+extern void            Kit_TruthMuxVarPhase( unsigned * pOut, unsigned * pCof0, unsigned * pCof1, int nVars, int iVar, int fCompl0 );
+extern void            Kit_TruthChangePhase( unsigned * pTruth, int nVars, int iVar );
+extern int             Kit_TruthMinCofSuppOverlap( unsigned * pTruth, int nVars, int * pVarMin );
+extern int             Kit_TruthBestCofVar( unsigned * pTruth, int nVars, unsigned * pCof0, unsigned * pCof1 );
+extern void            Kit_TruthCountOnesInCofs( unsigned * pTruth, int nVars, short * pStore );
+extern void            Kit_TruthCountOnesInCofsSlow( unsigned * pTruth, int nVars, short * pStore, unsigned * pAux );
+extern unsigned        Kit_TruthHash( unsigned * pIn, int nWords );
+extern unsigned        Kit_TruthSemiCanonicize( unsigned * pInOut, unsigned * pAux, int nVars, char * pCanonPerm, short * pStore );
+extern char *          Kit_TruthDumpToFile( unsigned * pTruth, int nVars, int nFile );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/kit/kitAig.c b/abc70930/src/aig/kit/kitAig.c
new file mode 100644
index 00000000..83012a8c
--- /dev/null
+++ b/abc70930/src/aig/kit/kitAig.c
@@ -0,0 +1,121 @@
+/**CFile****************************************************************
+
+  FileName    [kitAig.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures involving AIGs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitAig.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+#include "aig.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms the decomposition graph into the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Kit_GraphToAigInternal( Aig_Man_t * pMan, Kit_Graph_t * pGraph )
+{
+    Kit_Node_t * pNode = NULL;
+    Aig_Obj_t * pAnd0, * pAnd1;
+    int i;
+    // check for constant function
+    if ( Kit_GraphIsConst(pGraph) )
+        return Aig_NotCond( Aig_ManConst1(pMan), Kit_GraphIsComplement(pGraph) );
+    // check for a literal
+    if ( Kit_GraphIsVar(pGraph) )
+        return Aig_NotCond( Kit_GraphVar(pGraph)->pFunc, Kit_GraphIsComplement(pGraph) );
+    // build the AIG nodes corresponding to the AND gates of the graph
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        pAnd0 = Aig_NotCond( Kit_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        pAnd1 = Aig_NotCond( Kit_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        pNode->pFunc = Aig_And( pMan, pAnd0, pAnd1 );
+    }
+    // complement the result if necessary
+    return Aig_NotCond( pNode->pFunc, Kit_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Strashes one logic node using its SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Kit_GraphToAig( Aig_Man_t * pMan, Aig_Obj_t ** pFanins, Kit_Graph_t * pGraph )
+{
+    Kit_Node_t * pNode = NULL;
+    int i;
+    // collect the fanins
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->pFunc = pFanins[i];
+    // perform strashing
+    return Kit_GraphToAigInternal( pMan, pGraph );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Strashed onen logic nodes using its truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Aig_Obj_t * Kit_TruthToAig( Aig_Man_t * pMan, Aig_Obj_t ** pFanins, unsigned * pTruth, int nVars, Vec_Int_t * vMemory )
+{
+    Aig_Obj_t * pObj;
+    Kit_Graph_t * pGraph;
+    // transform truth table into the decomposition tree
+    if ( vMemory == NULL )
+    {
+        vMemory = Vec_IntAlloc( 0 );
+        pGraph = Kit_TruthToGraph( pTruth, nVars, vMemory );
+        Vec_IntFree( vMemory );
+    }
+    else
+        pGraph = Kit_TruthToGraph( pTruth, nVars, vMemory );
+    // derive the AIG for the decomposition tree
+    pObj = Kit_GraphToAig( pMan, pFanins, pGraph );
+    Kit_GraphFree( pGraph );
+    return pObj;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitBdd.c b/abc70930/src/aig/kit/kitBdd.c
new file mode 100644
index 00000000..9c8d4f7a
--- /dev/null
+++ b/abc70930/src/aig/kit/kitBdd.c
@@ -0,0 +1,231 @@
+/**CFile****************************************************************
+
+  FileName    [kitBdd.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures involving BDDs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitBdd.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+#include "extra.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the BDD for the given SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+DdNode * Kit_SopToBdd( DdManager * dd, Kit_Sop_t * cSop, int nVars )
+{
+    DdNode * bSum, * bCube, * bTemp, * bVar;
+    unsigned uCube;
+    int Value, i, v;
+    assert( nVars < 16 );
+    // start the cover
+    bSum = Cudd_ReadLogicZero(dd);   Cudd_Ref( bSum );
+   // check the logic function of the node
+    Kit_SopForEachCube( cSop, uCube, i )
+    {
+        bCube = Cudd_ReadOne(dd);   Cudd_Ref( bCube );
+        for ( v = 0; v < nVars; v++ )
+        {
+            Value = ((uCube >> 2*v) & 3);
+            if ( Value == 1 )
+                bVar = Cudd_Not( Cudd_bddIthVar( dd, v ) );
+            else if ( Value == 2 )
+                bVar = Cudd_bddIthVar( dd, v );
+            else
+                continue;
+            bCube  = Cudd_bddAnd( dd, bTemp = bCube, bVar );   Cudd_Ref( bCube );
+            Cudd_RecursiveDeref( dd, bTemp );
+        }
+        bSum = Cudd_bddOr( dd, bTemp = bSum, bCube );   
+        Cudd_Ref( bSum );
+        Cudd_RecursiveDeref( dd, bTemp );
+        Cudd_RecursiveDeref( dd, bCube );
+    }
+    // complement the result if necessary
+    Cudd_Deref( bSum );
+    return bSum;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Converts graph to BDD.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+DdNode * Kit_GraphToBdd( DdManager * dd, Kit_Graph_t * pGraph )
+{
+    DdNode * bFunc, * bFunc0, * bFunc1;
+    Kit_Node_t * pNode;
+    int i;
+
+    // sanity checks
+    assert( Kit_GraphLeaveNum(pGraph) >= 0 );
+    assert( Kit_GraphLeaveNum(pGraph) <= pGraph->nSize );
+
+    // check for constant function
+    if ( Kit_GraphIsConst(pGraph) )
+        return Cudd_NotCond( b1, Kit_GraphIsComplement(pGraph) );
+    // check for a literal
+    if ( Kit_GraphIsVar(pGraph) )
+        return Cudd_NotCond( Cudd_bddIthVar(dd, Kit_GraphVarInt(pGraph)), Kit_GraphIsComplement(pGraph) );
+
+    // assign the elementary variables
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->pFunc = Cudd_bddIthVar( dd, i );
+
+    // compute the function for each internal node
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        bFunc0 = Cudd_NotCond( Kit_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        bFunc1 = Cudd_NotCond( Kit_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        pNode->pFunc = Cudd_bddAnd( dd, bFunc0, bFunc1 );   Cudd_Ref( pNode->pFunc );
+    }
+
+    // deref the intermediate results
+    bFunc = pNode->pFunc;   Cudd_Ref( bFunc );
+    Kit_GraphForEachNode( pGraph, pNode, i )
+        Cudd_RecursiveDeref( dd, pNode->pFunc );
+    Cudd_Deref( bFunc );
+
+    // complement the result if necessary
+    return Cudd_NotCond( bFunc, Kit_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+DdNode * Kit_TruthToBdd_rec( DdManager * dd, unsigned * pTruth, int iBit, int nVars, int nVarsTotal, int fMSBonTop )
+{
+    DdNode * bF0, * bF1, * bF;
+    int Var;
+    if ( nVars <= 5 )
+    {
+        unsigned uTruth, uMask;
+        uMask = ((~(unsigned)0) >> (32 - (1<<nVars)));
+        uTruth = (pTruth[iBit>>5] >> (iBit&31)) & uMask;
+        if ( uTruth == 0 )
+            return b0;
+        if ( uTruth == uMask )
+            return b1;        
+    }
+    // find the variable to use
+    Var = fMSBonTop? nVarsTotal-nVars : nVars-1;
+    // other special cases can be added
+    bF0 = Kit_TruthToBdd_rec( dd, pTruth, iBit,                nVars-1, nVarsTotal, fMSBonTop );  Cudd_Ref( bF0 );
+    bF1 = Kit_TruthToBdd_rec( dd, pTruth, iBit+(1<<(nVars-1)), nVars-1, nVarsTotal, fMSBonTop );  Cudd_Ref( bF1 );
+    bF  = Cudd_bddIte( dd, dd->vars[Var], bF1, bF0 );                     Cudd_Ref( bF );
+    Cudd_RecursiveDeref( dd, bF0 );
+    Cudd_RecursiveDeref( dd, bF1 );
+    Cudd_Deref( bF );
+    return bF;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute BDD corresponding to the truth table.]
+
+  Description [If truth table has N vars, the BDD depends on N topmost
+  variables of the BDD manager. The most significant variable of the table
+  is encoded by the topmost variable of the manager. BDD construction is 
+  efficient in this case because BDD is constructed one node at a time, 
+  by simply adding BDD nodes on top of existent BDD nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+DdNode * Kit_TruthToBdd( DdManager * dd, unsigned * pTruth, int nVars, int fMSBonTop )
+{
+    return Kit_TruthToBdd_rec( dd, pTruth, 0, nVars, nVars, fMSBonTop );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Verifies that the factoring is correct.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopFactorVerify( Vec_Int_t * vCover, Kit_Graph_t * pFForm, int nVars )
+{
+    static DdManager * dd = NULL;
+    Kit_Sop_t Sop, * cSop = &Sop;
+    DdNode * bFunc1, * bFunc2;
+    Vec_Int_t * vMemory;
+    int RetValue;
+    // get the manager
+    if ( dd == NULL )
+        dd = Cudd_Init( 16, 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 );
+    // derive SOP
+    vMemory = Vec_IntAlloc( Vec_IntSize(vCover) );
+    Kit_SopCreate( cSop, vCover, nVars, vMemory );
+    // get the functions
+    bFunc1 = Kit_SopToBdd( dd, cSop, nVars );      Cudd_Ref( bFunc1 );
+    bFunc2 = Kit_GraphToBdd( dd, pFForm );         Cudd_Ref( bFunc2 );
+//Extra_bddPrint( dd, bFunc1 ); printf("\n");
+//Extra_bddPrint( dd, bFunc2 ); printf("\n");
+    RetValue = (bFunc1 == bFunc2);
+    if ( bFunc1 != bFunc2 )
+    {
+        int s;
+        Extra_bddPrint( dd, bFunc1 ); printf("\n");
+        Extra_bddPrint( dd, bFunc2 ); printf("\n");
+        s  = 0;
+    }
+    Cudd_RecursiveDeref( dd, bFunc1 );
+    Cudd_RecursiveDeref( dd, bFunc2 );
+    Vec_IntFree( vMemory );
+    return RetValue;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitCloud.c b/abc70930/src/aig/kit/kitCloud.c
new file mode 100644
index 00000000..7b160fea
--- /dev/null
+++ b/abc70930/src/aig/kit/kitCloud.c
@@ -0,0 +1,368 @@
+/**CFile****************************************************************
+
+  FileName    [kitCloud.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures using BDD package CLOUD.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitCloud.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// internal representation of the function to be decomposed
+typedef struct Kit_Mux_t_ Kit_Mux_t;
+struct Kit_Mux_t_
+{
+    unsigned      v  :  5;          // variable 
+    unsigned      t  : 12;          // then edge
+    unsigned      e  : 12;          // else edge
+    unsigned      c  :  1;          // complemented attr of else edge
+    unsigned      i  :  1;          // complemented attr of top node
+};
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Derive BDD from the truth table for 5 variable functions.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+CloudNode * Kit_TruthToCloud5_rec( CloudManager * dd, unsigned uTruth, int nVars, int nVarsAll )
+{
+    static unsigned uVars[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    CloudNode * pCof0, * pCof1;
+    unsigned uCof0, uCof1;
+    assert( nVars <= 5 );
+    if ( uTruth == 0 )
+        return dd->zero;
+    if ( uTruth == ~0 )
+        return dd->one;
+    if ( nVars == 1 )
+    {
+        if ( uTruth == uVars[0] )
+            return dd->vars[nVarsAll-1];
+        if ( uTruth == ~uVars[0] )
+            return Cloud_Not(dd->vars[nVarsAll-1]);
+        assert( 0 );
+    }
+//    Count++;
+    assert( nVars > 1 );
+    uCof0 = uTruth & ~uVars[nVars-1];
+    uCof1 = uTruth &  uVars[nVars-1];
+    uCof0 |= uCof0 << (1<<(nVars-1));
+    uCof1 |= uCof1 >> (1<<(nVars-1));
+    if ( uCof0 == uCof1 )
+        return Kit_TruthToCloud5_rec( dd, uCof0, nVars - 1, nVarsAll );
+    if ( uCof0 == ~uCof1 )
+    {
+        pCof0 = Kit_TruthToCloud5_rec( dd, uCof0, nVars - 1, nVarsAll );
+        pCof1 = Cloud_Not( pCof0 );
+    }
+    else
+    {
+        pCof0 = Kit_TruthToCloud5_rec( dd, uCof0, nVars - 1, nVarsAll );
+        pCof1 = Kit_TruthToCloud5_rec( dd, uCof1, nVars - 1, nVarsAll );
+    }
+    return Cloud_MakeNode( dd, nVarsAll - nVars, pCof1, pCof0 );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Compute BDD for the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Kit_TruthToCloud_rec( CloudManager * dd, unsigned * pTruth, int nVars, int nVarsAll )
+{
+    CloudNode * pCof0, * pCof1;
+    unsigned * pTruth0, * pTruth1;
+    if ( nVars <= 5 )
+        return Kit_TruthToCloud5_rec( dd, pTruth[0], nVars, nVarsAll );
+    if ( Kit_TruthIsConst0(pTruth, nVars) )
+        return dd->zero;
+    if ( Kit_TruthIsConst1(pTruth, nVars) )
+        return dd->one;
+//    Count++;
+    pTruth0 = pTruth;
+    pTruth1 = pTruth + Kit_TruthWordNum(nVars-1);
+    if ( Kit_TruthIsEqual( pTruth0, pTruth1, nVars - 1 ) )
+        return Kit_TruthToCloud_rec( dd, pTruth0, nVars - 1, nVarsAll );
+    if ( Kit_TruthIsOpposite( pTruth0, pTruth1, nVars - 1 ) )
+    {
+        pCof0 = Kit_TruthToCloud_rec( dd, pTruth0, nVars - 1, nVarsAll );
+        pCof1 = Cloud_Not( pCof0 );
+    }
+    else
+    {
+        pCof0 = Kit_TruthToCloud_rec( dd, pTruth0, nVars - 1, nVarsAll );
+        pCof1 = Kit_TruthToCloud_rec( dd, pTruth1, nVars - 1, nVarsAll );
+    }
+    return Cloud_MakeNode( dd, nVarsAll - nVars, pCof1, pCof0 );
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Compute BDD for the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+CloudNode * Kit_TruthToCloud( CloudManager * dd, unsigned * pTruth, int nVars )
+{
+    CloudNode * pRes;
+    pRes = Kit_TruthToCloud_rec( dd, pTruth, nVars, nVars );
+//    printf( "%d/%d  ", Count, Cloud_DagSize(dd, pRes) );
+    return pRes;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Transforms the array of BDDs into the integer array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Kit_CreateCloud( CloudManager * dd, CloudNode * pFunc, Vec_Int_t * vNodes )
+{
+    Kit_Mux_t Mux;
+    int nNodes, i;
+    // collect BDD nodes
+    nNodes = Cloud_DagCollect( dd, pFunc );
+    if ( nNodes >= (1<<12) ) // because in Kit_Mux_t edge is 12 bit
+        return 0;
+    assert( nNodes == Cloud_DagSize( dd, pFunc ) );
+    assert( nNodes < dd->nNodesLimit );
+    Vec_IntClear( vNodes );
+    Vec_IntPush( vNodes, 0 ); // const1 node
+    dd->ppNodes[0]->s = 0;
+    for ( i = 1; i < nNodes; i++ )
+    {
+        dd->ppNodes[i]->s = i;
+        Mux.v = dd->ppNodes[i]->v;
+        Mux.t = dd->ppNodes[i]->t->s;
+        Mux.e = Cloud_Regular(dd->ppNodes[i]->e)->s;
+        Mux.c = Cloud_IsComplement(dd->ppNodes[i]->e); 
+        Mux.i = (i == nNodes - 1)? Cloud_IsComplement(pFunc) : 0;
+        // put the MUX into the array
+        Vec_IntPush( vNodes, *((int *)&Mux) );
+    }
+    assert( Vec_IntSize(vNodes) == nNodes );
+    // reset signatures
+    for ( i = 0; i < nNodes; i++ )
+        dd->ppNodes[i]->s = dd->nSignCur;
+    return 1;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Transforms the array of BDDs into the integer array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+int Kit_CreateCloudFromTruth( CloudManager * dd, unsigned * pTruth, int nVars, Vec_Int_t * vNodes )
+{
+    CloudNode * pFunc;
+    Cloud_Restart( dd );
+    pFunc = Kit_TruthToCloud( dd, pTruth, nVars );
+    Vec_IntClear( vNodes );
+    return Kit_CreateCloud( dd, pFunc, vNodes );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes composition of truth tables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_CloudToTruth( Vec_Int_t * vNodes, int nVars, Vec_Ptr_t * vStore, int fInv )
+{
+    unsigned * pThis, * pFan0, * pFan1;
+    Kit_Mux_t Mux;
+    int i, Entry;
+    assert( Vec_IntSize(vNodes) <= Vec_PtrSize(vStore) );
+    pThis = Vec_PtrEntry( vStore, 0 );
+    Kit_TruthFill( pThis, nVars );
+    Vec_IntForEachEntryStart( vNodes, Entry, i, 1 )
+    {
+        Mux = *((Kit_Mux_t *)&Entry);
+        assert( (int)Mux.e < i && (int)Mux.t < i && (int)Mux.v < nVars );          
+        pFan0 = Vec_PtrEntry( vStore, Mux.e );
+        pFan1 = Vec_PtrEntry( vStore, Mux.t );
+        pThis = Vec_PtrEntry( vStore, i );
+        Kit_TruthMuxVarPhase( pThis, pFan0, pFan1, nVars, fInv? Mux.v : nVars-1-Mux.v, Mux.c );
+    } 
+    // complement the result
+    if ( Mux.i )
+        Kit_TruthNot( pThis, pThis, nVars );
+    return pThis;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes composition of truth tables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_TruthCompose( CloudManager * dd, unsigned * pTruth, int nVars, 
+    unsigned ** pInputs, int nVarsAll, Vec_Ptr_t * vStore, Vec_Int_t * vNodes )
+{
+    CloudNode * pFunc;
+    unsigned * pThis, * pFan0, * pFan1;
+    Kit_Mux_t Mux;
+    int i, Entry, RetValue;
+    // derive BDD from truth table
+    Cloud_Restart( dd );
+    pFunc = Kit_TruthToCloud( dd, pTruth, nVars );
+    // convert it into nodes
+    RetValue = Kit_CreateCloud( dd, pFunc, vNodes );
+    if ( RetValue == 0 )
+        printf( "Kit_TruthCompose(): Internal failure!!!\n" );
+    // verify the result
+//    pFan0 = Kit_CloudToTruth( vNodes, nVars, vStore, 0 );
+//    if ( !Kit_TruthIsEqual( pTruth, pFan0, nVars ) )
+//        printf( "Failed!\n" );
+    // compute truth table from the BDD
+    assert( Vec_IntSize(vNodes) <= Vec_PtrSize(vStore) );
+    pThis = Vec_PtrEntry( vStore, 0 );
+    Kit_TruthFill( pThis, nVarsAll );
+    Vec_IntForEachEntryStart( vNodes, Entry, i, 1 )
+    {
+        Mux = *((Kit_Mux_t *)&Entry);
+        pFan0 = Vec_PtrEntry( vStore, Mux.e );
+        pFan1 = Vec_PtrEntry( vStore, Mux.t );
+        pThis = Vec_PtrEntry( vStore, i );
+        Kit_TruthMuxPhase( pThis, pFan0, pFan1, pInputs[nVars-1-Mux.v], nVarsAll, Mux.c );
+    }
+    // complement the result
+    if ( Mux.i )
+        Kit_TruthNot( pThis, pThis, nVarsAll );
+    return pThis;
+}
+
+/**Function********************************************************************
+
+  Synopsis    [Compute BDD for the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+******************************************************************************/
+void Kit_TruthCofSupports( Vec_Int_t * vBddDir, Vec_Int_t * vBddInv, int nVars, Vec_Int_t * vMemory, unsigned * puSupps )
+{
+    Kit_Mux_t Mux;
+    unsigned * puSuppAll, * pThis, * pFan0, * pFan1;
+    int i, v, Var, Entry, nSupps;
+    nSupps = 2 * nVars;
+
+    // extend storage
+    if ( Vec_IntSize( vMemory ) < nSupps * Vec_IntSize(vBddDir) )
+        Vec_IntGrow( vMemory, nSupps * Vec_IntSize(vBddDir) );
+    puSuppAll = Vec_IntArray( vMemory );
+    // clear storage for the const node
+    memset( puSuppAll, 0, sizeof(unsigned) * nSupps );
+    // compute supports from nodes
+    Vec_IntForEachEntryStart( vBddDir, Entry, i, 1 )
+    {
+        Mux = *((Kit_Mux_t *)&Entry);
+        Var = nVars - 1 - Mux.v;
+        pFan0 = puSuppAll + nSupps * Mux.e;
+        pFan1 = puSuppAll + nSupps * Mux.t;
+        pThis = puSuppAll + nSupps * i;
+        for ( v = 0; v < nSupps; v++ )
+            pThis[v] = pFan0[v] | pFan1[v] | (1<<Var);
+        assert( pFan0[2*Var + 0] == pFan0[2*Var + 1] );
+        assert( pFan1[2*Var + 0] == pFan1[2*Var + 1] );
+        pThis[2*Var + 0] = pFan0[2*Var + 0];// | pFan0[2*Var + 1];
+        pThis[2*Var + 1] = pFan1[2*Var + 0];// | pFan1[2*Var + 1];
+    }
+    // copy the result
+    memcpy( puSupps, pThis, sizeof(unsigned) * nSupps );
+    // compute the inverse
+
+    // extend storage
+    if ( Vec_IntSize( vMemory ) < nSupps * Vec_IntSize(vBddInv) )
+        Vec_IntGrow( vMemory, nSupps * Vec_IntSize(vBddInv) );
+    puSuppAll = Vec_IntArray( vMemory );
+    // clear storage for the const node
+    memset( puSuppAll, 0, sizeof(unsigned) * nSupps );
+    // compute supports from nodes
+    Vec_IntForEachEntryStart( vBddInv, Entry, i, 1 )
+    {
+        Mux = *((Kit_Mux_t *)&Entry);
+//        Var = nVars - 1 - Mux.v;
+        Var = Mux.v;
+        pFan0 = puSuppAll + nSupps * Mux.e;
+        pFan1 = puSuppAll + nSupps * Mux.t;
+        pThis = puSuppAll + nSupps * i;
+        for ( v = 0; v < nSupps; v++ )
+            pThis[v] = pFan0[v] | pFan1[v] | (1<<Var);
+        assert( pFan0[2*Var + 0] == pFan0[2*Var + 1] );
+        assert( pFan1[2*Var + 0] == pFan1[2*Var + 1] );
+        pThis[2*Var + 0] = pFan0[2*Var + 0];// | pFan0[2*Var + 1];
+        pThis[2*Var + 1] = pFan1[2*Var + 0];// | pFan1[2*Var + 1];
+    }
+
+    // merge supports
+    for ( Var = 0; Var < nSupps; Var++ )
+        puSupps[Var] = (puSupps[Var] & Kit_BitMask(Var/2)) | (pThis[Var] & ~Kit_BitMask(Var/2));
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitDsd.c b/abc70930/src/aig/kit/kitDsd.c
new file mode 100644
index 00000000..e24a9964
--- /dev/null
+++ b/abc70930/src/aig/kit/kitDsd.c
@@ -0,0 +1,2621 @@
+/**CFile****************************************************************
+
+  FileName    [kitDsd.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Performs disjoint-support decomposition based on truth tables.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitDsd.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the DSD manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdMan_t * Kit_DsdManAlloc( int nVars, int nNodes )
+{
+    Kit_DsdMan_t * p;
+    p = ALLOC( Kit_DsdMan_t, 1 );
+    memset( p, 0, sizeof(Kit_DsdMan_t) );
+    p->nVars    = nVars;
+    p->nWords   = Kit_TruthWordNum( p->nVars );
+    p->vTtElems = Vec_PtrAllocTruthTables( p->nVars );
+    p->vTtNodes = Vec_PtrAllocSimInfo( nNodes, p->nWords );
+    p->dd       = Cloud_Init( 16, 14 );
+    p->vTtBdds  = Vec_PtrAllocSimInfo( (1<<12), p->nWords );
+    p->vNodes   = Vec_IntAlloc( 512 );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates the DSD manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdManFree( Kit_DsdMan_t * p )
+{
+    Cloud_Quit( p->dd );
+    Vec_IntFree( p->vNodes );
+    Vec_PtrFree( p->vTtBdds );
+    Vec_PtrFree( p->vTtElems );
+    Vec_PtrFree( p->vTtNodes );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the DSD node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdObj_t * Kit_DsdObjAlloc( Kit_DsdNtk_t * pNtk, Kit_Dsd_t Type, int nFans )
+{
+    Kit_DsdObj_t * pObj;
+    int nSize = sizeof(Kit_DsdObj_t) + sizeof(unsigned) * (Kit_DsdObjOffset(nFans) + (Type == KIT_DSD_PRIME) * Kit_TruthWordNum(nFans));
+    pObj = (Kit_DsdObj_t *)ALLOC( char, nSize );
+    memset( pObj, 0, nSize );
+    pObj->Id = pNtk->nVars + pNtk->nNodes;
+    pObj->Type = Type;
+    pObj->nFans = nFans;
+    pObj->Offset = Kit_DsdObjOffset( nFans );
+    // add the object
+    if ( pNtk->nNodes == pNtk->nNodesAlloc )
+    {
+        pNtk->nNodesAlloc *= 2;
+        pNtk->pNodes = REALLOC( Kit_DsdObj_t *, pNtk->pNodes, pNtk->nNodesAlloc ); 
+    }
+    assert( pNtk->nNodes < pNtk->nNodesAlloc );
+    pNtk->pNodes[pNtk->nNodes++] = pObj;
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocates the DSD node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdObjFree( Kit_DsdNtk_t * p, Kit_DsdObj_t * pObj )
+{
+    free( pObj );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdNtkAlloc( int nVars )
+{
+    Kit_DsdNtk_t * pNtk;
+    pNtk = ALLOC( Kit_DsdNtk_t, 1 );
+    memset( pNtk, 0, sizeof(Kit_DsdNtk_t) );
+    pNtk->pNodes = ALLOC( Kit_DsdObj_t *, nVars );
+    pNtk->nVars = nVars;
+    pNtk->nNodesAlloc = nVars;
+    pNtk->pMem = ALLOC( unsigned, 6 * Kit_TruthWordNum(nVars) );
+    return pNtk;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Deallocate the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdNtkFree( Kit_DsdNtk_t * pNtk )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned i;
+    Kit_DsdNtkForEachObj( pNtk, pObj, i )
+        free( pObj );
+    FREE( pNtk->pSupps );
+    free( pNtk->pNodes );
+    free( pNtk->pMem );
+    free( pNtk );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the hex unsigned into a file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrintHex( FILE * pFile, unsigned * pTruth, int nFans )
+{
+    int nDigits, Digit, k;
+    nDigits = (1 << nFans) / 4;
+    for ( k = nDigits - 1; k >= 0; k-- )
+    {
+        Digit = ((pTruth[k/8] >> ((k%8) * 4)) & 15);
+        if ( Digit < 10 )
+            fprintf( pFile, "%d", Digit );
+        else
+            fprintf( pFile, "%c", 'A' + Digit-10 );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursively print the DSD formula.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrint_rec( FILE * pFile, Kit_DsdNtk_t * pNtk, int Id )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned iLit, i;
+    char Symbol;
+
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    if ( pObj == NULL )
+    {
+        assert( Id < pNtk->nVars );
+        fprintf( pFile, "%c", 'a' + Id );
+        return;
+    }
+
+    if ( pObj->Type == KIT_DSD_CONST1 )
+    {
+        assert( pObj->nFans == 0 );
+        fprintf( pFile, "Const1" );
+        return;
+    }
+
+    if ( pObj->Type == KIT_DSD_VAR )
+        assert( pObj->nFans == 1 );
+
+    if ( pObj->Type == KIT_DSD_AND )
+        Symbol = '*';
+    else if ( pObj->Type == KIT_DSD_XOR )
+        Symbol = '+';
+    else 
+        Symbol = ',';
+
+    if ( pObj->Type == KIT_DSD_PRIME )
+        Kit_DsdPrintHex( stdout, Kit_DsdObjTruth(pObj), pObj->nFans );
+
+    fprintf( pFile, "(" );
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+    {
+        if ( Kit_DsdLitIsCompl(iLit) ) 
+            fprintf( pFile, "!" );
+        Kit_DsdPrint_rec( pFile, pNtk, Kit_DsdLit2Var(iLit) );
+        if ( i < pObj->nFans - 1 )
+            fprintf( pFile, "%c", Symbol );
+    }
+    fprintf( pFile, ")" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the DSD formula.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrint( FILE * pFile, Kit_DsdNtk_t * pNtk )
+{
+    fprintf( pFile, "F = " );
+    if ( Kit_DsdLitIsCompl(pNtk->Root) )
+        fprintf( pFile, "!" );
+    Kit_DsdPrint_rec( pFile, pNtk, Kit_DsdLit2Var(pNtk->Root) );
+    fprintf( pFile, "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the DSD formula.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrintExpanded( Kit_DsdNtk_t * pNtk )
+{
+    Kit_DsdNtk_t * pTemp;
+    pTemp = Kit_DsdExpand( pNtk );
+    Kit_DsdPrint( stdout, pTemp );
+    Kit_DsdNtkFree( pTemp );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Print the DSD formula.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrintFromTruth( unsigned * pTruth, int nVars )
+{
+    Kit_DsdNtk_t * pTemp;
+    pTemp = Kit_DsdDecomposeMux( pTruth, nVars, 5 );
+    Kit_DsdVerify( pTemp, pTruth, nVars ); 
+    Kit_DsdPrintExpanded( pTemp );
+    Kit_DsdNtkFree( pTemp );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthComputeNode_rec( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, int Id )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned * pTruthRes, * pTruthFans[16], * pTruthTemp;
+    unsigned i, iLit, fCompl;
+//    unsigned m, nMints, * pTruthPrime, * pTruthMint; 
+
+    // get the node with this ID
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    pTruthRes = Vec_PtrEntry( p->vTtNodes, Id );
+
+    // special case: literal of an internal node
+    if ( pObj == NULL )
+    {
+        assert( Id < pNtk->nVars );
+        return pTruthRes;
+    }
+
+    // constant node
+    if ( pObj->Type == KIT_DSD_CONST1 )
+    {
+        assert( pObj->nFans == 0 );
+        Kit_TruthFill( pTruthRes, pNtk->nVars );
+        return pTruthRes;
+    }
+
+    // elementary variable node
+    if ( pObj->Type == KIT_DSD_VAR )
+    {
+        assert( pObj->nFans == 1 );
+        iLit = pObj->pFans[0];
+        pTruthFans[0] = Kit_DsdTruthComputeNode_rec( p, pNtk, Kit_DsdLit2Var(iLit) );
+        if ( Kit_DsdLitIsCompl(iLit) )
+            Kit_TruthNot( pTruthRes, pTruthFans[0], pNtk->nVars );
+        else
+            Kit_TruthCopy( pTruthRes, pTruthFans[0], pNtk->nVars );
+        return pTruthRes;
+    }
+
+    // collect the truth tables of the fanins
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        pTruthFans[i] = Kit_DsdTruthComputeNode_rec( p, pNtk, Kit_DsdLit2Var(iLit) );
+    // create the truth table
+
+    // simple gates
+    if ( pObj->Type == KIT_DSD_AND )
+    {
+        Kit_TruthFill( pTruthRes, pNtk->nVars );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            Kit_TruthAndPhase( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars, 0, Kit_DsdLitIsCompl(iLit) );
+        return pTruthRes;
+    }
+    if ( pObj->Type == KIT_DSD_XOR )
+    {
+        Kit_TruthClear( pTruthRes, pNtk->nVars );
+        fCompl = 0;
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        {
+            Kit_TruthXor( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars );
+            fCompl ^= Kit_DsdLitIsCompl(iLit);
+        }
+        if ( fCompl )
+            Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+        return pTruthRes;
+    }
+    assert( pObj->Type == KIT_DSD_PRIME );
+/*
+    // get the truth table of the prime node
+    pTruthPrime = Kit_DsdObjTruth( pObj );
+    // get storage for the temporary minterm
+    pTruthMint = Vec_PtrEntry(p->vTtNodes, pNtk->nVars + pNtk->nNodes);
+
+    // go through the minterms
+    nMints = (1 << pObj->nFans);
+    Kit_TruthClear( pTruthRes, pNtk->nVars );
+    for ( m = 0; m < nMints; m++ )
+    {
+        if ( !Kit_TruthHasBit(pTruthPrime, m) )
+            continue;
+        Kit_TruthFill( pTruthMint, pNtk->nVars );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            Kit_TruthAndPhase( pTruthMint, pTruthMint, pTruthFans[i], pNtk->nVars, 0, ((m & (1<<i)) == 0) ^ Kit_DsdLitIsCompl(iLit) );
+        Kit_TruthOr( pTruthRes, pTruthRes, pTruthMint, pNtk->nVars );
+    }
+*/
+    pTruthTemp = Kit_TruthCompose( p->dd, Kit_DsdObjTruth(pObj), pObj->nFans, pTruthFans, pNtk->nVars, p->vTtBdds, p->vNodes );
+    Kit_TruthCopy( pTruthRes, pTruthTemp, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthCompute( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk )
+{
+    unsigned * pTruthRes;
+    int i;
+    // assign elementary truth ables
+    assert( pNtk->nVars <= p->nVars );
+    for ( i = 0; i < (int)pNtk->nVars; i++ )
+        Kit_TruthCopy( Vec_PtrEntry(p->vTtNodes, i), Vec_PtrEntry(p->vTtElems, i), p->nVars );
+    // compute truth table for each node
+    pTruthRes = Kit_DsdTruthComputeNode_rec( p, pNtk, Kit_DsdLit2Var(pNtk->Root) );
+    // complement the truth table if needed
+    if ( Kit_DsdLitIsCompl(pNtk->Root) )
+        Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthComputeNodeOne_rec( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, int Id, unsigned uSupp )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned * pTruthRes, * pTruthFans[16], * pTruthTemp;
+    unsigned i, iLit, fCompl, nPartial = 0;
+//    unsigned m, nMints, * pTruthPrime, * pTruthMint; 
+
+    // get the node with this ID
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    pTruthRes = Vec_PtrEntry( p->vTtNodes, Id );
+
+    // special case: literal of an internal node
+    if ( pObj == NULL )
+    {
+        assert( Id < pNtk->nVars );
+        assert( !uSupp || uSupp != (uSupp & ~(1<<Id)) );
+        return pTruthRes;
+    }
+
+    // constant node
+    if ( pObj->Type == KIT_DSD_CONST1 )
+    {
+        assert( pObj->nFans == 0 );
+        Kit_TruthFill( pTruthRes, pNtk->nVars );
+        return pTruthRes;
+    }
+
+    // elementary variable node
+    if ( pObj->Type == KIT_DSD_VAR )
+    {
+        assert( pObj->nFans == 1 );
+        iLit = pObj->pFans[0];
+        assert( Kit_DsdLitIsLeaf( pNtk, iLit ) );
+        pTruthFans[0] = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(iLit), uSupp );
+        if ( Kit_DsdLitIsCompl(iLit) )
+            Kit_TruthNot( pTruthRes, pTruthFans[0], pNtk->nVars );
+        else
+            Kit_TruthCopy( pTruthRes, pTruthFans[0], pNtk->nVars );
+        return pTruthRes;
+    }
+
+    // collect the truth tables of the fanins
+    if ( uSupp )
+    {
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            if ( uSupp != (uSupp & ~Kit_DsdLitSupport(pNtk, iLit)) )
+                pTruthFans[i] = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(iLit), uSupp );
+            else
+            {
+                pTruthFans[i] = NULL;
+                nPartial = 1;
+            }
+    }
+    else
+    {
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            pTruthFans[i] = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(iLit), uSupp );
+    }
+    // create the truth table
+
+    // simple gates
+    if ( pObj->Type == KIT_DSD_AND )
+    {
+        Kit_TruthFill( pTruthRes, pNtk->nVars );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            if ( pTruthFans[i] )
+                Kit_TruthAndPhase( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars, 0, Kit_DsdLitIsCompl(iLit) );
+        return pTruthRes;
+    }
+    if ( pObj->Type == KIT_DSD_XOR )
+    {
+        Kit_TruthClear( pTruthRes, pNtk->nVars );
+        fCompl = 0;
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        {
+            if ( pTruthFans[i] )
+            {
+                Kit_TruthXor( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars );
+                fCompl ^= Kit_DsdLitIsCompl(iLit);
+            }
+        }
+        if ( fCompl )
+            Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+        return pTruthRes;
+    }
+    assert( pObj->Type == KIT_DSD_PRIME );
+
+    if ( uSupp && nPartial )
+    {
+        // find the only non-empty component
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            if ( pTruthFans[i] )
+                break;
+        assert( i < pObj->nFans );
+        return pTruthFans[i];
+    }
+/*
+    // get the truth table of the prime node
+    pTruthPrime = Kit_DsdObjTruth( pObj );
+    // get storage for the temporary minterm
+    pTruthMint = Vec_PtrEntry(p->vTtNodes, pNtk->nVars + pNtk->nNodes);
+
+    // go through the minterms
+    nMints = (1 << pObj->nFans);
+    Kit_TruthClear( pTruthRes, pNtk->nVars );
+    for ( m = 0; m < nMints; m++ )
+    {
+        if ( !Kit_TruthHasBit(pTruthPrime, m) )
+            continue;
+        Kit_TruthFill( pTruthMint, pNtk->nVars );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            Kit_TruthAndPhase( pTruthMint, pTruthMint, pTruthFans[i], pNtk->nVars, 0, ((m & (1<<i)) == 0) ^ Kit_DsdLitIsCompl(iLit) );
+        Kit_TruthOr( pTruthRes, pTruthRes, pTruthMint, pNtk->nVars );
+    }
+*/
+    pTruthTemp = Kit_TruthCompose( p->dd, Kit_DsdObjTruth(pObj), pObj->nFans, pTruthFans, pNtk->nVars, p->vTtBdds, p->vNodes );
+    Kit_TruthCopy( pTruthRes, pTruthTemp, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthComputeOne( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned uSupp )
+{
+    unsigned * pTruthRes;
+    int i;
+    // if support is specified, request that supports are available
+    if ( uSupp )
+        Kit_DsdGetSupports( pNtk );
+    // assign elementary truth tables
+    assert( pNtk->nVars <= p->nVars );
+    for ( i = 0; i < (int)pNtk->nVars; i++ )
+        Kit_TruthCopy( Vec_PtrEntry(p->vTtNodes, i), Vec_PtrEntry(p->vTtElems, i), p->nVars );
+    // compute truth table for each node
+    pTruthRes = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(pNtk->Root), uSupp );
+    // complement the truth table if needed
+    if ( Kit_DsdLitIsCompl(pNtk->Root) )
+        Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthComputeNodeTwo_rec( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, int Id, unsigned uSupp, int iVar, unsigned * pTruthDec )
+{
+    Kit_DsdObj_t * pObj;
+    int pfBoundSet[16];
+    unsigned * pTruthRes, * pTruthFans[16], * pTruthTemp;
+    unsigned i, iLit, fCompl, nPartial, uSuppFan, uSuppCur;
+//    unsigned m, nMints, * pTruthPrime, * pTruthMint; 
+    assert( uSupp > 0 );
+
+    // get the node with this ID
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    pTruthRes = Vec_PtrEntry( p->vTtNodes, Id );
+    if ( pObj == NULL )
+    {
+        assert( Id < pNtk->nVars );
+        return pTruthRes;
+    }
+    assert( pObj->Type != KIT_DSD_CONST1 );
+    assert( pObj->Type != KIT_DSD_VAR );
+
+    // count the number of intersecting fanins 
+    // collect the total support of the intersecting fanins
+    nPartial = 0;
+    uSuppFan = 0;
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+    {
+        uSuppCur = Kit_DsdLitSupport(pNtk, iLit);
+        if ( uSupp & uSuppCur )
+        {
+            nPartial++;
+            uSuppFan |= uSuppCur;
+        }
+    }
+
+    // if there is no intersection, or full intersection, use simple procedure
+    if ( nPartial == 0 || nPartial == pObj->nFans )
+        return Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Id, 0 );
+
+    // if support of the component includes some other variables
+    // we need to continue constructing it as usual by the two-function procedure
+    if ( uSuppFan != (uSuppFan & uSupp) )
+    {
+        assert( nPartial == 1 );
+//        return Kit_DsdTruthComputeNodeTwo_rec( p, pNtk, Id, uSupp, iVar, pTruthDec );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        {
+            if ( uSupp & Kit_DsdLitSupport(pNtk, iLit) )
+                pTruthFans[i] = Kit_DsdTruthComputeNodeTwo_rec( p, pNtk, Kit_DsdLit2Var(iLit), uSupp, iVar, pTruthDec );
+            else
+                pTruthFans[i] = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(iLit), 0 );
+        }
+
+        // create composition/decomposition functions
+        if ( pObj->Type == KIT_DSD_AND )
+        {
+            Kit_TruthFill( pTruthRes, pNtk->nVars );
+            Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+                Kit_TruthAndPhase( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars, 0, Kit_DsdLitIsCompl(iLit) );
+            return pTruthRes;
+        }
+        if ( pObj->Type == KIT_DSD_XOR )
+        {
+            Kit_TruthClear( pTruthRes, pNtk->nVars );
+            fCompl = 0;
+            Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            {
+                fCompl ^= Kit_DsdLitIsCompl(iLit);
+                Kit_TruthXor( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars );
+            }
+            if ( fCompl )
+                Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+            return pTruthRes;
+        }
+        assert( pObj->Type == KIT_DSD_PRIME );
+    }
+    else
+    {
+        assert( uSuppFan == (uSuppFan & uSupp) );
+        assert( nPartial < pObj->nFans );
+        // the support of the insecting component(s) is contained in the bound-set
+        // and yet there are components that are not contained in the bound set
+
+        // solve the fanins and collect info, which components belong to the bound set
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        {
+            pTruthFans[i] = Kit_DsdTruthComputeNodeOne_rec( p, pNtk, Kit_DsdLit2Var(iLit), 0 );
+            pfBoundSet[i] = (int)((uSupp & Kit_DsdLitSupport(pNtk, iLit)) > 0);
+        }
+
+        // create composition/decomposition functions
+        if ( pObj->Type == KIT_DSD_AND )
+        {
+            Kit_TruthIthVar( pTruthRes, pNtk->nVars, iVar );
+            Kit_TruthFill( pTruthDec, pNtk->nVars );
+            Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+                if ( pfBoundSet[i] )
+                    Kit_TruthAndPhase( pTruthDec, pTruthDec, pTruthFans[i], pNtk->nVars, 0, Kit_DsdLitIsCompl(iLit) );
+                else
+                    Kit_TruthAndPhase( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars, 0, Kit_DsdLitIsCompl(iLit) );
+            return pTruthRes;
+        }
+        if ( pObj->Type == KIT_DSD_XOR )
+        {
+            Kit_TruthIthVar( pTruthRes, pNtk->nVars, iVar );
+            Kit_TruthClear( pTruthDec, pNtk->nVars );
+            fCompl = 0;
+            Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            {
+                fCompl ^= Kit_DsdLitIsCompl(iLit);
+                if ( pfBoundSet[i] )
+                    Kit_TruthXor( pTruthDec, pTruthDec, pTruthFans[i], pNtk->nVars );
+                else
+                    Kit_TruthXor( pTruthRes, pTruthRes, pTruthFans[i], pNtk->nVars );
+            }
+            if ( fCompl )
+                Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+            return pTruthRes;
+        }
+        assert( pObj->Type == KIT_DSD_PRIME );
+        assert( nPartial == 1 );
+
+        // find the only non-empty component
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            if ( pfBoundSet[i] )
+                break;
+        assert( i < pObj->nFans );
+
+        // save this component as the decomposed function
+        Kit_TruthCopy( pTruthDec, pTruthFans[i], pNtk->nVars );
+        // set the corresponding component to be the new variable
+        Kit_TruthIthVar( pTruthFans[i], pNtk->nVars, iVar );
+    }
+/*
+    // get the truth table of the prime node
+    pTruthPrime = Kit_DsdObjTruth( pObj );
+    // get storage for the temporary minterm
+    pTruthMint = Vec_PtrEntry(p->vTtNodes, pNtk->nVars + pNtk->nNodes);
+
+    // go through the minterms
+    nMints = (1 << pObj->nFans);
+    Kit_TruthClear( pTruthRes, pNtk->nVars );
+    for ( m = 0; m < nMints; m++ )
+    {
+        if ( !Kit_TruthHasBit(pTruthPrime, m) )
+            continue;
+        Kit_TruthFill( pTruthMint, pNtk->nVars );
+        Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+            Kit_TruthAndPhase( pTruthMint, pTruthMint, pTruthFans[i], pNtk->nVars, 0, ((m & (1<<i)) == 0) ^ Kit_DsdLitIsCompl(iLit) );
+        Kit_TruthOr( pTruthRes, pTruthRes, pTruthMint, pNtk->nVars );
+    }
+*/
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        assert( !Kit_DsdLitIsCompl(iLit) );
+    pTruthTemp = Kit_TruthCompose( p->dd, Kit_DsdObjTruth(pObj), pObj->nFans, pTruthFans, pNtk->nVars, p->vTtBdds, p->vNodes );
+    Kit_TruthCopy( pTruthRes, pTruthTemp, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_DsdTruthComputeTwo( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned uSupp, int iVar, unsigned * pTruthDec )
+{
+    unsigned * pTruthRes, uSuppAll;
+    int i;
+    assert( uSupp > 0 );
+    assert( pNtk->nVars <= p->nVars );
+    // compute support of all nodes
+    uSuppAll = Kit_DsdGetSupports( pNtk );
+    // consider special case - there is no overlap
+    if ( (uSupp & uSuppAll) == 0 )
+    {
+        Kit_TruthClear( pTruthDec, pNtk->nVars );
+        return Kit_DsdTruthCompute( p, pNtk );
+    }
+    // consider special case - support is fully contained
+    if ( (uSupp & uSuppAll) == uSuppAll )
+    {
+        pTruthRes = Kit_DsdTruthCompute( p, pNtk );
+        Kit_TruthCopy( pTruthDec, pTruthRes, pNtk->nVars );
+        Kit_TruthIthVar( pTruthRes, pNtk->nVars, iVar );
+        return pTruthRes;
+    }
+    // assign elementary truth tables
+    for ( i = 0; i < (int)pNtk->nVars; i++ )
+        Kit_TruthCopy( Vec_PtrEntry(p->vTtNodes, i), Vec_PtrEntry(p->vTtElems, i), p->nVars );
+    // compute truth table for each node
+    pTruthRes = Kit_DsdTruthComputeNodeTwo_rec( p, pNtk, Kit_DsdLit2Var(pNtk->Root), uSupp, iVar, pTruthDec );
+    // complement the truth table if needed
+    if ( Kit_DsdLitIsCompl(pNtk->Root) )
+        Kit_TruthNot( pTruthRes, pTruthRes, pNtk->nVars );
+    return pTruthRes;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdTruth( Kit_DsdNtk_t * pNtk, unsigned * pTruthRes )
+{
+    Kit_DsdMan_t * p;
+    unsigned * pTruth;
+    p = Kit_DsdManAlloc( pNtk->nVars, Kit_DsdNtkObjNum(pNtk) );
+    pTruth = Kit_DsdTruthCompute( p, pNtk );
+    Kit_TruthCopy( pTruthRes, pTruth, pNtk->nVars );
+    Kit_DsdManFree( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdTruthPartialTwo( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned uSupp, int iVar, unsigned * pTruthCo, unsigned * pTruthDec )
+{
+    unsigned * pTruth = Kit_DsdTruthComputeTwo( p, pNtk, uSupp, iVar, pTruthDec );
+    if ( pTruthCo )
+        Kit_TruthCopy( pTruthCo, pTruth, pNtk->nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table of the DSD network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdTruthPartial( Kit_DsdMan_t * p, Kit_DsdNtk_t * pNtk, unsigned * pTruthRes, unsigned uSupp )
+{
+    unsigned * pTruth = Kit_DsdTruthComputeOne( p, pNtk, uSupp );
+    Kit_TruthCopy( pTruthRes, pTruth, pNtk->nVars );
+/*
+    // verification
+    {
+        // compute the same function using different procedure
+        unsigned * pTruthTemp = Vec_PtrEntry(p->vTtNodes, pNtk->nVars + pNtk->nNodes + 1);
+        pNtk->pSupps = NULL;
+        Kit_DsdTruthComputeTwo( p, pNtk, uSupp, -1, pTruthTemp );
+//        if ( !Kit_TruthIsEqual( pTruthTemp, pTruthRes, pNtk->nVars ) )
+        if ( !Kit_TruthIsEqualWithPhase( pTruthTemp, pTruthRes, pNtk->nVars ) )
+        {
+            printf( "Verification FAILED!\n" );
+            Kit_DsdPrint( stdout, pNtk );
+            Kit_DsdPrintFromTruth( pTruthRes, pNtk->nVars );
+            Kit_DsdPrintFromTruth( pTruthTemp, pNtk->nVars );
+        }
+//        else
+//            printf( "Verification successful.\n" );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of blocks of the given number of inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdCountLuts_rec( Kit_DsdNtk_t * pNtk, int nLutSize, int Id, int * pCounter )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned iLit, i, Res0, Res1;
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    if ( pObj == NULL )
+        return 0;
+    if ( pObj->Type == KIT_DSD_AND || pObj->Type == KIT_DSD_XOR )
+    {
+        assert( pObj->nFans == 2 );
+        Res0 = Kit_DsdCountLuts_rec( pNtk, nLutSize, Kit_DsdLit2Var(pObj->pFans[0]), pCounter );
+        Res1 = Kit_DsdCountLuts_rec( pNtk, nLutSize, Kit_DsdLit2Var(pObj->pFans[1]), pCounter );
+        if ( Res0 == 0 && Res1 > 0 )
+            return Res1 - 1;
+        if ( Res0 > 0 && Res1 == 0 )
+            return Res0 - 1;
+        (*pCounter)++;
+        return nLutSize - 2;
+    }
+    assert( pObj->Type == KIT_DSD_PRIME );
+    if ( (int)pObj->nFans > nLutSize ) //+ 1 )
+    {
+        *pCounter = 1000;
+        return 0;
+    }
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        Kit_DsdCountLuts_rec( pNtk, nLutSize, Kit_DsdLit2Var(iLit), pCounter );
+    (*pCounter)++;
+//    if ( (int)pObj->nFans == nLutSize + 1 )
+//        (*pCounter)++;
+    return nLutSize - pObj->nFans;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of blocks of the given number of inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdCountLuts( Kit_DsdNtk_t * pNtk, int nLutSize )
+{
+    int Counter = 0;
+    if ( Kit_DsdNtkRoot(pNtk)->Type == KIT_DSD_CONST1 )
+        return 0;
+    if ( Kit_DsdNtkRoot(pNtk)->Type == KIT_DSD_VAR )
+        return 0;
+    Kit_DsdCountLuts_rec( pNtk, nLutSize, Kit_DsdLit2Var(pNtk->Root), &Counter );
+    if ( Counter >= 1000 )
+        return -1;
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of blocks of the given number of inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdNonDsdSizeMax( Kit_DsdNtk_t * pNtk )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned i, nSizeMax = 0;
+    Kit_DsdNtkForEachObj( pNtk, pObj, i )
+    {
+        if ( pObj->Type != KIT_DSD_PRIME )
+            continue;
+        if ( nSizeMax < pObj->nFans )
+            nSizeMax = pObj->nFans;
+    }
+    return nSizeMax;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Finds the union of supports of the non-DSD blocks.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_DsdNonDsdSupports( Kit_DsdNtk_t * pNtk )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned i, uSupport = 0;
+//    FREE( pNtk->pSupps );
+    Kit_DsdGetSupports( pNtk );
+    Kit_DsdNtkForEachObj( pNtk, pObj, i )
+    {
+        if ( pObj->Type != KIT_DSD_PRIME )
+            continue;
+        uSupport |= Kit_DsdLitSupport( pNtk, Kit_DsdVar2Lit(pObj->Id,0) );
+    }
+    return uSupport;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the node.]
+
+  Description [Returns the new literal.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdExpandCollectAnd_rec( Kit_DsdNtk_t * p, int iLit, int * piLitsNew, int * nLitsNew )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned i, iLitFanin;
+    // check the end of the supergate
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    if ( Kit_DsdLitIsCompl(iLit) || Kit_DsdLit2Var(iLit) < p->nVars || pObj->Type != KIT_DSD_AND )
+    {
+        piLitsNew[(*nLitsNew)++] = iLit;
+        return;
+    }
+    // iterate through the fanins
+    Kit_DsdObjForEachFanin( p, pObj, iLitFanin, i )
+        Kit_DsdExpandCollectAnd_rec( p, iLitFanin, piLitsNew, nLitsNew );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the node.]
+
+  Description [Returns the new literal.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdExpandCollectXor_rec( Kit_DsdNtk_t * p, int iLit, int * piLitsNew, int * nLitsNew )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned i, iLitFanin;
+    // check the end of the supergate
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    if ( Kit_DsdLit2Var(iLit) < p->nVars || pObj->Type != KIT_DSD_XOR )
+    {
+        piLitsNew[(*nLitsNew)++] = iLit;
+        return;
+    }
+    // iterate through the fanins
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    Kit_DsdObjForEachFanin( p, pObj, iLitFanin, i )
+        Kit_DsdExpandCollectXor_rec( p, iLitFanin, piLitsNew, nLitsNew );
+    // if the literal was complemented, pass the complemented attribute somewhere
+    if ( Kit_DsdLitIsCompl(iLit) )
+        piLitsNew[0] = Kit_DsdLitNot( piLitsNew[0] );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the node.]
+
+  Description [Returns the new literal.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdExpandNode_rec( Kit_DsdNtk_t * pNew, Kit_DsdNtk_t * p, int iLit )
+{
+    unsigned * pTruth, * pTruthNew;
+    unsigned i, iLitFanin, piLitsNew[16], nLitsNew = 0;
+    Kit_DsdObj_t * pObj, * pObjNew;
+
+    // consider the case of simple gate
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    if ( pObj == NULL )
+        return iLit;
+    if ( pObj->Type == KIT_DSD_AND )
+    {
+        Kit_DsdExpandCollectAnd_rec( p, Kit_DsdLitRegular(iLit), piLitsNew, &nLitsNew );
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_AND, nLitsNew );
+        for ( i = 0; i < pObjNew->nFans; i++ )
+            pObjNew->pFans[i] = Kit_DsdExpandNode_rec( pNew, p, piLitsNew[i] );
+        return Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(iLit) );
+    }
+    if ( pObj->Type == KIT_DSD_XOR )
+    {
+        int fCompl = Kit_DsdLitIsCompl(iLit);
+        Kit_DsdExpandCollectXor_rec( p, Kit_DsdLitRegular(iLit), piLitsNew, &nLitsNew );
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_XOR, nLitsNew );
+        for ( i = 0; i < pObjNew->nFans; i++ )
+        {
+            pObjNew->pFans[i] = Kit_DsdExpandNode_rec( pNew, p, Kit_DsdLitRegular(piLitsNew[i]) );
+            fCompl ^= Kit_DsdLitIsCompl(piLitsNew[i]);
+        }
+        return Kit_DsdVar2Lit( pObjNew->Id, fCompl );
+    }
+    assert( pObj->Type == KIT_DSD_PRIME );
+
+    // create new PRIME node
+    pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_PRIME, pObj->nFans );
+    // copy the truth table
+    pTruth = Kit_DsdObjTruth( pObj );
+    pTruthNew = Kit_DsdObjTruth( pObjNew );
+    Kit_TruthCopy( pTruthNew, pTruth, pObj->nFans );
+    // create fanins
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLitFanin, i )
+    {
+        pObjNew->pFans[i] = Kit_DsdExpandNode_rec( pNew, p, iLitFanin );
+        // complement the corresponding inputs of the truth table
+        if ( Kit_DsdLitIsCompl(pObjNew->pFans[i]) )
+        {
+            pObjNew->pFans[i] = Kit_DsdLitRegular(pObjNew->pFans[i]);
+            Kit_TruthChangePhase( pTruthNew, pObjNew->nFans, i );
+        }
+    }
+    // if the incoming phase is complemented, absorb it into the prime node
+    if ( Kit_DsdLitIsCompl(iLit) )
+        Kit_TruthNot( pTruthNew, pTruthNew, pObj->nFans );
+    return Kit_DsdVar2Lit( pObjNew->Id, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the network.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdExpand( Kit_DsdNtk_t * p )
+{
+    Kit_DsdNtk_t * pNew;
+    Kit_DsdObj_t * pObjNew;
+    assert( p->nVars <= 16 );
+    // create a new network
+    pNew = Kit_DsdNtkAlloc( p->nVars );
+    // consider simple special cases
+    if ( Kit_DsdNtkRoot(p)->Type == KIT_DSD_CONST1 )
+    {
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_CONST1, 0 );
+        pNew->Root = Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(p->Root) );
+        return pNew;
+    }
+    if ( Kit_DsdNtkRoot(p)->Type == KIT_DSD_VAR )
+    {
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_VAR, 1 );
+        pObjNew->pFans[0] = Kit_DsdNtkRoot(p)->pFans[0];
+        pNew->Root = Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(p->Root) );
+        return pNew;
+    }
+    // convert the root node
+    pNew->Root = Kit_DsdExpandNode_rec( pNew, p, p->Root );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sorts the literals by their support.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdCompSort( int pPrios[], unsigned uSupps[], unsigned char * piLits, int nVars, int piLitsRes[] )
+{
+    int nSuppSizes[16], Priority[16], pOrder[16];
+    int i, k, iVarBest, SuppMax, PrioMax;
+    // compute support sizes and priorities of the components
+    for ( i = 0; i < nVars; i++ )
+    {
+        assert( uSupps[i] );
+        pOrder[i] = i;
+        Priority[i] = KIT_INFINITY;
+        for ( k = 0; k < 16; k++ )
+            if ( uSupps[i] & (1 << k) )
+                Priority[i] = KIT_MIN( Priority[i], pPrios[k] );
+        assert( Priority[i] != 16 );
+        nSuppSizes[i] = Kit_WordCountOnes(uSupps[i]);
+    }
+    // sort the components by pririty
+    Extra_BubbleSort( pOrder, Priority, nVars, 0 );
+    // find the component by with largest size and lowest priority
+    iVarBest = -1;
+    SuppMax  = 0;
+    PrioMax  = 0;
+    for ( i = 0; i < nVars; i++ )
+    {
+        if ( SuppMax < nSuppSizes[i] || (SuppMax == nSuppSizes[i] && PrioMax < Priority[i]) )
+        {
+            SuppMax  = nSuppSizes[i];
+            PrioMax  = Priority[i];
+            iVarBest = i;
+        }
+    }
+    assert( iVarBest != -1 );
+    // copy the resulting literals
+    k = 0;
+    piLitsRes[k++] = piLits[iVarBest];
+    for ( i = 0; i < nVars; i++ )
+    {
+        if ( pOrder[i] == iVarBest )
+            continue;
+        piLitsRes[k++] = piLits[pOrder[i]];
+    }
+    assert( k == nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Shrinks multi-input nodes.]
+
+  Description [Takes the array of variable priorities pPrios.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdShrink_rec( Kit_DsdNtk_t * pNew, Kit_DsdNtk_t * p, int iLit, int pPrios[] )
+{
+    Kit_DsdObj_t * pObj, * pObjNew;
+    unsigned * pTruth, * pTruthNew;
+    unsigned i, piLitsNew[16], uSupps[16];
+    int iLitFanin, iLitNew;
+
+    // consider the case of simple gate
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    if ( pObj == NULL )
+        return iLit;
+    if ( pObj->Type == KIT_DSD_AND )
+    {
+        // get the supports
+        Kit_DsdObjForEachFanin( p, pObj, iLitFanin, i )
+            uSupps[i] = Kit_DsdLitSupport( p, iLitFanin );
+        // put the largest component last
+        // sort other components in the decreasing order of priority of their vars
+        Kit_DsdCompSort( pPrios, uSupps, pObj->pFans, pObj->nFans, piLitsNew );
+        // construct the two-input node network
+        iLitNew = Kit_DsdShrink_rec( pNew, p, piLitsNew[0], pPrios );
+        for ( i = 1; i < pObj->nFans; i++ )
+        {
+            pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_AND, 2 );
+            pObjNew->pFans[0] = Kit_DsdShrink_rec( pNew, p, piLitsNew[i], pPrios );
+            pObjNew->pFans[1] = iLitNew;
+            iLitNew = Kit_DsdVar2Lit( pObjNew->Id, 0 );
+        }
+        return Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(iLit) );
+    }
+    if ( pObj->Type == KIT_DSD_XOR )
+    {
+        // get the supports
+        Kit_DsdObjForEachFanin( p, pObj, iLitFanin, i )
+        {
+            assert( !Kit_DsdLitIsCompl(iLitFanin) );
+            uSupps[i] = Kit_DsdLitSupport( p, iLitFanin );
+        }
+        // put the largest component last
+        // sort other components in the decreasing order of priority of their vars
+        Kit_DsdCompSort( pPrios, uSupps, pObj->pFans, pObj->nFans, piLitsNew );
+        // construct the two-input node network
+        iLitNew = Kit_DsdShrink_rec( pNew, p, piLitsNew[0], pPrios );
+        for ( i = 1; i < pObj->nFans; i++ )
+        {
+            pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_XOR, 2 );
+            pObjNew->pFans[0] = Kit_DsdShrink_rec( pNew, p, piLitsNew[i], pPrios );
+            pObjNew->pFans[1] = iLitNew;
+            iLitNew = Kit_DsdVar2Lit( pObjNew->Id, 0 );
+        }
+        return Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(iLit) );
+    }
+    assert( pObj->Type == KIT_DSD_PRIME );
+
+    // create new PRIME node
+    pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_PRIME, pObj->nFans );
+    // copy the truth table
+    pTruth = Kit_DsdObjTruth( pObj );
+    pTruthNew = Kit_DsdObjTruth( pObjNew );
+    Kit_TruthCopy( pTruthNew, pTruth, pObj->nFans );
+    // create fanins
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLitFanin, i )
+    {
+        pObjNew->pFans[i] = Kit_DsdShrink_rec( pNew, p, iLitFanin, pPrios );
+        // complement the corresponding inputs of the truth table
+        if ( Kit_DsdLitIsCompl(pObjNew->pFans[i]) )
+        {
+            pObjNew->pFans[i] = Kit_DsdLitRegular(pObjNew->pFans[i]);
+            Kit_TruthChangePhase( pTruthNew, pObjNew->nFans, i );
+        }
+    }
+    // if the incoming phase is complemented, absorb it into the prime node
+    if ( Kit_DsdLitIsCompl(iLit) )
+        Kit_TruthNot( pTruthNew, pTruthNew, pObj->nFans );
+    return Kit_DsdVar2Lit( pObjNew->Id, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Shrinks the network.]
+
+  Description [Transforms the network to have two-input nodes so that the
+  higher-ordered nodes were decomposed out first.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdShrink( Kit_DsdNtk_t * p, int pPrios[] )
+{
+    Kit_DsdNtk_t * pNew;
+    Kit_DsdObj_t * pObjNew;
+    assert( p->nVars <= 16 );
+    // create a new network
+    pNew = Kit_DsdNtkAlloc( p->nVars );
+    // consider simple special cases
+    if ( Kit_DsdNtkRoot(p)->Type == KIT_DSD_CONST1 )
+    {
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_CONST1, 0 );
+        pNew->Root = Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(p->Root) );
+        return pNew;
+    }
+    if ( Kit_DsdNtkRoot(p)->Type == KIT_DSD_VAR )
+    {
+        pObjNew = Kit_DsdObjAlloc( pNew, KIT_DSD_VAR, 1 );
+        pObjNew->pFans[0] = Kit_DsdNtkRoot(p)->pFans[0];
+        pNew->Root = Kit_DsdVar2Lit( pObjNew->Id, Kit_DsdLitIsCompl(p->Root) );
+        return pNew;
+    }
+    // convert the root node
+    pNew->Root = Kit_DsdShrink_rec( pNew, p, p->Root, pPrios );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Rotates the network.]
+
+  Description [Transforms prime nodes to have the fanin with the
+  highest frequency of supports go first.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdRotate( Kit_DsdNtk_t * p, int pFreqs[] )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned * pIn, * pOut, * pTemp, k;
+    int i, v, Temp, uSuppFanin, iFaninLit, WeightMax, FaninMax, nSwaps;
+    int Weights[16];
+    // go through the prime nodes
+    Kit_DsdNtkForEachObj( p, pObj, i )
+    {
+        if ( pObj->Type != KIT_DSD_PRIME )
+            continue;
+        // count the fanin frequencies
+        Kit_DsdObjForEachFanin( p, pObj, iFaninLit, k )
+        {
+            uSuppFanin = Kit_DsdLitSupport( p, iFaninLit );
+            Weights[k] = 0;
+            for ( v = 0; v < 16; v++ )
+                if ( uSuppFanin & (1 << v) )
+                    Weights[k] += pFreqs[v] - 1;
+        }
+        // find the most frequent fanin
+        WeightMax = 0; 
+        FaninMax = -1;
+        for ( k = 0; k < pObj->nFans; k++ )
+            if ( WeightMax < Weights[k] )
+            {
+                WeightMax = Weights[k];
+                FaninMax = k;
+            }
+        // no need to reorder if there are no frequent fanins
+        if ( FaninMax == -1 )
+            continue;
+        // move the fanins number k to the first place
+        nSwaps = 0;
+        pIn = Kit_DsdObjTruth(pObj);
+        pOut = p->pMem;
+//        for ( v = FaninMax; v < ((int)pObj->nFans)-1; v++ )
+        for ( v = FaninMax-1; v >= 0; v-- )
+        {
+            // swap the fanins
+            Temp = pObj->pFans[v];
+            pObj->pFans[v] = pObj->pFans[v+1];
+            pObj->pFans[v+1] = Temp;
+            // swap the truth table variables
+            Kit_TruthSwapAdjacentVars( pOut, pIn, pObj->nFans, v );
+            pTemp = pIn; pIn = pOut; pOut = pTemp;
+            nSwaps++;
+        }
+        if ( nSwaps & 1 )
+            Kit_TruthCopy( pOut, pIn, pObj->nFans );
+    }    
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the support.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_DsdGetSupports_rec( Kit_DsdNtk_t * p, int iLit )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned uSupport, k;
+    int iFaninLit;
+    pObj = Kit_DsdNtkObj( p, Kit_DsdLit2Var(iLit) );
+    if ( pObj == NULL )
+        return Kit_DsdLitSupport( p, iLit );
+    uSupport = 0;
+    Kit_DsdObjForEachFanin( p, pObj, iFaninLit, k )
+        uSupport |= Kit_DsdGetSupports_rec( p, iFaninLit );
+    p->pSupps[pObj->Id - p->nVars] = uSupport;
+    assert( uSupport <= 0xFFFF );
+    return uSupport;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Compute the support.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_DsdGetSupports( Kit_DsdNtk_t * p )
+{
+    Kit_DsdObj_t * pRoot;
+    unsigned uSupport;
+    assert( p->pSupps == NULL );
+    p->pSupps = ALLOC( unsigned, p->nNodes );
+    // consider simple special cases
+    pRoot = Kit_DsdNtkRoot(p);
+    if ( pRoot->Type == KIT_DSD_CONST1 )
+    {
+        assert( p->nNodes == 1 );
+        uSupport = p->pSupps[0] = 0;
+    }
+    if ( pRoot->Type == KIT_DSD_VAR )
+    {
+        assert( p->nNodes == 1 );
+        uSupport = p->pSupps[0] = Kit_DsdLitSupport( p, pRoot->pFans[0] );
+    }
+    else
+        uSupport = Kit_DsdGetSupports_rec( p, p->Root );
+    assert( uSupport <= 0xFFFF );
+    return uSupport;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if there is a component with more than 3 inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdFindLargeBox_rec( Kit_DsdNtk_t * pNtk, int Id, int Size )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned iLit, i, RetValue;
+    pObj = Kit_DsdNtkObj( pNtk, Id );
+    if ( pObj == NULL )
+        return 0;
+    if ( pObj->Type == KIT_DSD_PRIME && (int)pObj->nFans > Size )
+        return 1;
+    RetValue = 0;
+    Kit_DsdObjForEachFanin( pNtk, pObj, iLit, i )
+        RetValue |= Kit_DsdFindLargeBox_rec( pNtk, Kit_DsdLit2Var(iLit), Size );
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if there is a component with more than 3 inputs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdFindLargeBox( Kit_DsdNtk_t * pNtk, int Size )
+{
+    return Kit_DsdFindLargeBox_rec( pNtk, Kit_DsdLit2Var(pNtk->Root), Size );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the non-DSD 4-var func is implementable with two 3-LUTs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdRootNodeHasCommonVars( Kit_DsdObj_t * pObj0, Kit_DsdObj_t * pObj1 )
+{
+    unsigned i, k;
+    for ( i = 0; i < pObj0->nFans; i++ )
+    {
+        if ( Kit_DsdLit2Var(pObj0->pFans[i]) >= 4 )
+            continue;
+        for ( k = 0; k < pObj1->nFans; k++ )
+            if ( Kit_DsdLit2Var(pObj0->pFans[i]) == Kit_DsdLit2Var(pObj1->pFans[k]) )
+                return 1;
+    }
+    return 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if the non-DSD 4-var func is implementable with two 3-LUTs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdCheckVar4Dec2( Kit_DsdNtk_t * pNtk0, Kit_DsdNtk_t * pNtk1 )
+{
+    assert( pNtk0->nVars == 4 );
+    assert( pNtk1->nVars == 4 );
+    if ( Kit_DsdFindLargeBox(pNtk0, 2) )
+        return 0;
+    if ( Kit_DsdFindLargeBox(pNtk1, 2) )
+        return 0;
+    return Kit_DsdRootNodeHasCommonVars( Kit_DsdNtkRoot(pNtk0), Kit_DsdNtkRoot(pNtk1) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdDecompose_rec( Kit_DsdNtk_t * pNtk, Kit_DsdObj_t * pObj, unsigned uSupp, unsigned char * pPar, int nDecMux )
+{
+    Kit_DsdObj_t * pRes, * pRes0, * pRes1;
+    int nWords = Kit_TruthWordNum(pObj->nFans);
+    unsigned * pTruth = Kit_DsdObjTruth(pObj);
+    unsigned * pCofs2[2] = { pNtk->pMem, pNtk->pMem + nWords };
+    unsigned * pCofs4[2][2] = { {pNtk->pMem + 2 * nWords, pNtk->pMem + 3 * nWords}, {pNtk->pMem + 4 * nWords, pNtk->pMem + 5 * nWords} };
+    int i, iLit0, iLit1, nFans0, nFans1, nPairs;
+    int fEquals[2][2], fOppos, fPairs[4][4];
+    unsigned j, k, nFansNew, uSupp0, uSupp1;
+
+    assert( pObj->nFans > 0 );
+    assert( pObj->Type == KIT_DSD_PRIME );
+    assert( uSupp == (uSupp0 = (unsigned)Kit_TruthSupport(pTruth, pObj->nFans)) );
+
+    // compress the truth table
+    if ( uSupp != Kit_BitMask(pObj->nFans) )
+    {
+        nFansNew = Kit_WordCountOnes(uSupp);
+        Kit_TruthShrink( pNtk->pMem, pTruth, nFansNew, pObj->nFans, uSupp, 1 );
+        for ( j = k = 0; j < pObj->nFans; j++ )
+            if ( uSupp & (1 << j) )
+                pObj->pFans[k++] = pObj->pFans[j];
+        assert( k == nFansNew );
+        pObj->nFans = k;
+        uSupp = Kit_BitMask(pObj->nFans);
+    }
+
+    // consider the single variable case
+    if ( pObj->nFans == 1 )
+    {
+        pObj->Type = KIT_DSD_NONE;
+        if ( pTruth[0] == 0x55555555 )
+            pObj->pFans[0] = Kit_DsdLitNot(pObj->pFans[0]);
+        else
+            assert( pTruth[0] == 0xAAAAAAAA );
+        // update the parent pointer
+        *pPar = Kit_DsdLitNotCond( pObj->pFans[0], Kit_DsdLitIsCompl(*pPar) );
+        return;
+    }
+
+    // decompose the output
+    if ( !pObj->fMark )
+    for ( i = pObj->nFans - 1; i >= 0; i-- )
+    {
+        // get the two-variable cofactors
+        Kit_TruthCofactor0New( pCofs2[0], pTruth, pObj->nFans, i );
+        Kit_TruthCofactor1New( pCofs2[1], pTruth, pObj->nFans, i );
+//        assert( !Kit_TruthVarInSupport( pCofs2[0], pObj->nFans, i) );
+//        assert( !Kit_TruthVarInSupport( pCofs2[1], pObj->nFans, i) );
+        // get the constant cofs
+        fEquals[0][0] = Kit_TruthIsConst0( pCofs2[0], pObj->nFans );
+        fEquals[0][1] = Kit_TruthIsConst0( pCofs2[1], pObj->nFans );
+        fEquals[1][0] = Kit_TruthIsConst1( pCofs2[0], pObj->nFans );
+        fEquals[1][1] = Kit_TruthIsConst1( pCofs2[1], pObj->nFans );
+        fOppos        = Kit_TruthIsOpposite( pCofs2[0], pCofs2[1], pObj->nFans );
+        assert( !Kit_TruthIsEqual(pCofs2[0], pCofs2[1], pObj->nFans) );
+        if ( fEquals[0][0] + fEquals[0][1] + fEquals[1][0] + fEquals[1][1] + fOppos == 0 )
+        {
+            // check the MUX decomposition
+            uSupp0 = Kit_TruthSupport( pCofs2[0], pObj->nFans );
+            uSupp1 = Kit_TruthSupport( pCofs2[1], pObj->nFans );
+            assert( uSupp == (uSupp0 | uSupp1 | (1<<i)) );
+            if ( uSupp0 & uSupp1 )
+                continue;
+            // perform MUX decomposition
+            pRes0 = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, pObj->nFans );
+            pRes1 = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, pObj->nFans );
+            for ( k = 0; k < pObj->nFans; k++ )
+            {
+                pRes0->pFans[k] = (uSupp0 & (1 << k))? pObj->pFans[k] : 127;
+                pRes1->pFans[k] = (uSupp1 & (1 << k))? pObj->pFans[k] : 127;
+            }
+            Kit_TruthCopy( Kit_DsdObjTruth(pRes0), pCofs2[0], pObj->nFans );        
+            Kit_TruthCopy( Kit_DsdObjTruth(pRes1), pCofs2[1], pObj->nFans ); 
+            // update the current one
+            assert( pObj->Type == KIT_DSD_PRIME );
+            pTruth[0] = 0xCACACACA;
+            pObj->nFans = 3;
+            pObj->pFans[2] = pObj->pFans[i];
+            pObj->pFans[0] = 2*pRes0->Id; pRes0->nRefs++;
+            pObj->pFans[1] = 2*pRes1->Id; pRes1->nRefs++;
+            // call recursively
+            Kit_DsdDecompose_rec( pNtk, pRes0, uSupp0, pObj->pFans + 0, nDecMux );
+            Kit_DsdDecompose_rec( pNtk, pRes1, uSupp1, pObj->pFans + 1, nDecMux );
+            return;
+        }
+
+        // create the new node
+        pRes = Kit_DsdObjAlloc( pNtk, KIT_DSD_AND, 2 );
+        pRes->nRefs++;
+        pRes->nFans = 2;
+        pRes->pFans[0] = pObj->pFans[i];  pObj->pFans[i] = 127;  uSupp &= ~(1 << i);
+        pRes->pFans[1] = 2*pObj->Id;
+        // update the parent pointer
+        *pPar = Kit_DsdLitNotCond( 2 * pRes->Id, Kit_DsdLitIsCompl(*pPar) );
+        // consider different decompositions
+        if ( fEquals[0][0] )
+        {
+            Kit_TruthCopy( pTruth, pCofs2[1], pObj->nFans );
+        }
+        else if ( fEquals[0][1] )
+        {
+            pRes->pFans[0] = Kit_DsdLitNot(pRes->pFans[0]);
+            Kit_TruthCopy( pTruth, pCofs2[0], pObj->nFans );
+        }
+        else if ( fEquals[1][0] )
+        {
+            *pPar = Kit_DsdLitNot(*pPar);
+            pRes->pFans[1] = Kit_DsdLitNot(pRes->pFans[1]);
+            Kit_TruthCopy( pTruth, pCofs2[1], pObj->nFans );
+        }
+        else if ( fEquals[1][1] )
+        {
+            *pPar = Kit_DsdLitNot(*pPar);
+            pRes->pFans[0] = Kit_DsdLitNot(pRes->pFans[0]);  
+            pRes->pFans[1] = Kit_DsdLitNot(pRes->pFans[1]);
+            Kit_TruthCopy( pTruth, pCofs2[0], pObj->nFans );
+        }
+        else if ( fOppos )
+        {
+            pRes->Type = KIT_DSD_XOR;
+            Kit_TruthCopy( pTruth, pCofs2[0], pObj->nFans );
+        }
+        else
+            assert( 0 );
+        // decompose the remainder
+        assert( Kit_DsdObjTruth(pObj) == pTruth );
+        Kit_DsdDecompose_rec( pNtk, pObj, uSupp, pRes->pFans + 1, nDecMux );
+        return;
+    }
+    pObj->fMark = 1;
+
+    // decompose the input
+    for ( i = pObj->nFans - 1; i >= 0; i-- )
+    {
+        assert( Kit_TruthVarInSupport( pTruth, pObj->nFans, i ) );
+        // get the single variale cofactors
+        Kit_TruthCofactor0New( pCofs2[0], pTruth, pObj->nFans, i );
+        Kit_TruthCofactor1New( pCofs2[1], pTruth, pObj->nFans, i );
+        // check the existence of MUX decomposition
+        uSupp0 = Kit_TruthSupport( pCofs2[0], pObj->nFans );
+        uSupp1 = Kit_TruthSupport( pCofs2[1], pObj->nFans );
+        assert( uSupp == (uSupp0 | uSupp1 | (1<<i)) );
+        // if one of the cofs is a constant, it is time to check the output again
+        if ( uSupp0 == 0 || uSupp1 == 0 )
+        {
+            pObj->fMark = 0;
+            Kit_DsdDecompose_rec( pNtk, pObj, uSupp, pPar, nDecMux );
+            return;
+        }
+        assert( uSupp0 && uSupp1 );
+        // get the number of unique variables
+        nFans0 = Kit_WordCountOnes( uSupp0 & ~uSupp1 );
+        nFans1 = Kit_WordCountOnes( uSupp1 & ~uSupp0 );
+        if ( nFans0 == 1 && nFans1 == 1 )
+        {
+            // get the cofactors w.r.t. the unique variables
+            iLit0 = Kit_WordFindFirstBit( uSupp0 & ~uSupp1 );
+            iLit1 = Kit_WordFindFirstBit( uSupp1 & ~uSupp0 );
+            // get four cofactors                                        
+            Kit_TruthCofactor0New( pCofs4[0][0], pCofs2[0], pObj->nFans, iLit0 );
+            Kit_TruthCofactor1New( pCofs4[0][1], pCofs2[0], pObj->nFans, iLit0 );
+            Kit_TruthCofactor0New( pCofs4[1][0], pCofs2[1], pObj->nFans, iLit1 );
+            Kit_TruthCofactor1New( pCofs4[1][1], pCofs2[1], pObj->nFans, iLit1 );
+            // check existence conditions
+            fEquals[0][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][0], pObj->nFans );
+            fEquals[0][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][1], pObj->nFans );
+            fEquals[1][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][1], pObj->nFans );
+            fEquals[1][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][0], pObj->nFans );
+            if ( (fEquals[0][0] && fEquals[0][1]) || (fEquals[1][0] && fEquals[1][1]) )
+            {
+                // construct the MUX
+                pRes = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, 3 );
+                Kit_DsdObjTruth(pRes)[0] = 0xCACACACA;
+                pRes->nRefs++;
+                pRes->nFans = 3;
+                pRes->pFans[0] = pObj->pFans[iLit0]; pObj->pFans[iLit0] = 127;  uSupp &= ~(1 << iLit0);
+                pRes->pFans[1] = pObj->pFans[iLit1]; pObj->pFans[iLit1] = 127;  uSupp &= ~(1 << iLit1);
+                pRes->pFans[2] = pObj->pFans[i];     pObj->pFans[i] = 2 * pRes->Id; // remains in support
+                // update the node
+//                if ( fEquals[0][0] && fEquals[0][1] )
+//                    Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[0][1], pObj->nFans, i );
+//                else
+//                    Kit_TruthMuxVar( pTruth, pCofs4[0][1], pCofs4[0][0], pObj->nFans, i );
+                Kit_TruthMuxVar( pTruth, pCofs4[1][0], pCofs4[1][1], pObj->nFans, i );
+                if ( fEquals[1][0] && fEquals[1][1] )
+                    pRes->pFans[0] = Kit_DsdLitNot(pRes->pFans[0]);
+                // decompose the remainder
+                Kit_DsdDecompose_rec( pNtk, pObj, uSupp, pPar, nDecMux );
+                return;
+            }
+        }
+
+        // try other inputs
+        for ( k = i+1; k < pObj->nFans; k++ )
+        {
+            // get four cofactors                                                ik
+            Kit_TruthCofactor0New( pCofs4[0][0], pCofs2[0], pObj->nFans, k ); // 00 
+            Kit_TruthCofactor1New( pCofs4[0][1], pCofs2[0], pObj->nFans, k ); // 01 
+            Kit_TruthCofactor0New( pCofs4[1][0], pCofs2[1], pObj->nFans, k ); // 10 
+            Kit_TruthCofactor1New( pCofs4[1][1], pCofs2[1], pObj->nFans, k ); // 11 
+            // compare equal pairs
+            fPairs[0][1] = fPairs[1][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[0][1], pObj->nFans );
+            fPairs[0][2] = fPairs[2][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][0], pObj->nFans );
+            fPairs[0][3] = fPairs[3][0] = Kit_TruthIsEqual( pCofs4[0][0], pCofs4[1][1], pObj->nFans );
+            fPairs[1][2] = fPairs[2][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][0], pObj->nFans );
+            fPairs[1][3] = fPairs[3][1] = Kit_TruthIsEqual( pCofs4[0][1], pCofs4[1][1], pObj->nFans );
+            fPairs[2][3] = fPairs[3][2] = Kit_TruthIsEqual( pCofs4[1][0], pCofs4[1][1], pObj->nFans );
+            nPairs = fPairs[0][1] + fPairs[0][2] + fPairs[0][3] + fPairs[1][2] + fPairs[1][3] + fPairs[2][3];
+            if ( nPairs != 3 && nPairs != 2 )
+                continue;
+
+            // decomposition exists
+            pRes = Kit_DsdObjAlloc( pNtk, KIT_DSD_AND, 2 );
+            pRes->nRefs++;
+            pRes->nFans = 2;
+            pRes->pFans[0] = pObj->pFans[k]; pObj->pFans[k] = 2 * pRes->Id;  // remains in support
+            pRes->pFans[1] = pObj->pFans[i]; pObj->pFans[i] = 127;       uSupp &= ~(1 << i);
+            if ( !fPairs[0][1] && !fPairs[0][2] && !fPairs[0][3] ) // 00
+            {
+                pRes->pFans[0] = Kit_DsdLitNot(pRes->pFans[0]);  
+                pRes->pFans[1] = Kit_DsdLitNot(pRes->pFans[1]);
+                Kit_TruthMuxVar( pTruth, pCofs4[1][1], pCofs4[0][0], pObj->nFans, k );
+            }
+            else if ( !fPairs[1][0] && !fPairs[1][2] && !fPairs[1][3] ) // 01
+            {
+                pRes->pFans[1] = Kit_DsdLitNot(pRes->pFans[1]);  
+                Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[0][1], pObj->nFans, k );
+            }
+            else if ( !fPairs[2][0] && !fPairs[2][1] && !fPairs[2][3] ) // 10
+            {
+                pRes->pFans[0] = Kit_DsdLitNot(pRes->pFans[0]);  
+                Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[1][0], pObj->nFans, k );
+            }
+            else if ( !fPairs[3][0] && !fPairs[3][1] && !fPairs[3][2] ) // 11
+            {
+//                unsigned uSupp0 = Kit_TruthSupport(pCofs4[0][0], pObj->nFans);
+//                unsigned uSupp1 = Kit_TruthSupport(pCofs4[1][1], pObj->nFans);
+//                unsigned uSupp;
+//                Extra_PrintBinary( stdout, &uSupp0, pObj->nFans ); printf( "\n" );
+//                Extra_PrintBinary( stdout, &uSupp1, pObj->nFans ); printf( "\n" );
+                Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[1][1], pObj->nFans, k );
+//                uSupp = Kit_TruthSupport(pTruth, pObj->nFans);
+//                Extra_PrintBinary( stdout, &uSupp, pObj->nFans ); printf( "\n" ); printf( "\n" );
+            }
+            else
+            {
+                assert( fPairs[0][3] && fPairs[1][2] );
+                pRes->Type = KIT_DSD_XOR;;
+                Kit_TruthMuxVar( pTruth, pCofs4[0][0], pCofs4[0][1], pObj->nFans, k );
+            }
+            // decompose the remainder
+            Kit_DsdDecompose_rec( pNtk, pObj, uSupp, pPar, nDecMux );
+            return;
+        }
+    }
+/*
+    // if all decomposition methods failed and we are still above the limit, perform MUX-decomposition
+    if ( nDecMux > 0 && (int)pObj->nFans > nDecMux )
+    {
+        int iBestVar = Kit_TruthBestCofVar( pTruth, pObj->nFans, pCofs2[0], pCofs2[1] );
+        uSupp0 = Kit_TruthSupport( pCofs2[0], pObj->nFans );
+        uSupp1 = Kit_TruthSupport( pCofs2[1], pObj->nFans );
+        // perform MUX decomposition
+        pRes0 = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, pObj->nFans );
+        pRes1 = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, pObj->nFans );
+        for ( k = 0; k < pObj->nFans; k++ )
+            pRes0->pFans[k] = pRes1->pFans[k] = pObj->pFans[k];
+        Kit_TruthCopy( Kit_DsdObjTruth(pRes0), pCofs2[0], pObj->nFans );        
+        Kit_TruthCopy( Kit_DsdObjTruth(pRes1), pCofs2[1], pObj->nFans ); 
+        // update the current one
+        assert( pObj->Type == KIT_DSD_PRIME );
+        pTruth[0] = 0xCACACACA;
+        pObj->nFans = 3;
+        pObj->pFans[0] = 2*pRes0->Id; pRes0->nRefs++;
+        pObj->pFans[1] = 2*pRes1->Id; pRes1->nRefs++;
+        pObj->pFans[2] = pObj->pFans[iBestVar];
+        // call recursively
+        Kit_DsdDecompose_rec( pNtk, pRes0, uSupp0, pObj->pFans + 0, nDecMux );
+        Kit_DsdDecompose_rec( pNtk, pRes1, uSupp1, pObj->pFans + 1, nDecMux );
+    }
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdDecomposeInt( unsigned * pTruth, int nVars, int nDecMux )
+{
+    Kit_DsdNtk_t * pNtk;
+    Kit_DsdObj_t * pObj;
+    unsigned uSupp;
+    int i, nVarsReal;
+    assert( nVars <= 16 );
+    pNtk = Kit_DsdNtkAlloc( nVars );
+    pNtk->Root = Kit_DsdVar2Lit( pNtk->nVars, 0 );
+    // create the first node
+    pObj = Kit_DsdObjAlloc( pNtk, KIT_DSD_PRIME, nVars );
+    assert( pNtk->pNodes[0] == pObj );
+    for ( i = 0; i < nVars; i++ )
+       pObj->pFans[i] = Kit_DsdVar2Lit( i, 0 );
+    Kit_TruthCopy( Kit_DsdObjTruth(pObj), pTruth, nVars );
+    uSupp = Kit_TruthSupport( pTruth, nVars );
+    // consider special cases
+    nVarsReal = Kit_WordCountOnes( uSupp );
+    if ( nVarsReal == 0 )
+    {
+        pObj->Type = KIT_DSD_CONST1;
+        pObj->nFans = 0;
+        if ( pTruth[0] == 0 )
+             pNtk->Root = Kit_DsdLitNot(pNtk->Root);
+        return pNtk;
+    }
+    if ( nVarsReal == 1 )
+    {
+        pObj->Type = KIT_DSD_VAR;
+        pObj->nFans = 1;
+        pObj->pFans[0] = Kit_DsdVar2Lit( Kit_WordFindFirstBit(uSupp), (pTruth[0] & 1) );
+        return pNtk;
+    }
+    Kit_DsdDecompose_rec( pNtk, pNtk->pNodes[0], uSupp, &pNtk->Root, nDecMux );
+    return pNtk;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdDecompose( unsigned * pTruth, int nVars )
+{
+    return Kit_DsdDecomposeInt( pTruth, nVars, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t * Kit_DsdDecomposeExpand( unsigned * pTruth, int nVars )
+{
+    Kit_DsdNtk_t * pNtk, * pTemp;
+    pNtk = Kit_DsdDecomposeInt( pTruth, nVars, 0 );
+    pNtk = Kit_DsdExpand( pTemp = pNtk );      
+    Kit_DsdNtkFree( pTemp );
+    return pNtk;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description [Uses MUXes to break-down large prime nodes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_DsdNtk_t *  Kit_DsdDecomposeMux( unsigned * pTruth, int nVars, int nDecMux )
+{
+    return Kit_DsdDecomposeInt( pTruth, nVars, nDecMux );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdTestCofs( Kit_DsdNtk_t * pNtk, unsigned * pTruthInit )
+{
+    Kit_DsdNtk_t * pNtk0, * pNtk1, * pTemp;
+//    Kit_DsdObj_t * pRoot;
+    unsigned * pCofs2[2] = { pNtk->pMem, pNtk->pMem + Kit_TruthWordNum(pNtk->nVars) };
+    unsigned i, * pTruth;
+    int fVerbose = 1;
+    int RetValue = 0;
+
+    pTruth = pTruthInit;
+//    pRoot = Kit_DsdNtkRoot(pNtk);
+//    pTruth = Kit_DsdObjTruth(pRoot);
+//    assert( pRoot->nFans == pNtk->nVars );
+
+    if ( fVerbose )
+    {
+        printf( "Function: " );
+//        Extra_PrintBinary( stdout, pTruth, (1 << pNtk->nVars) ); 
+        Extra_PrintHexadecimal( stdout, pTruth, pNtk->nVars ); 
+        printf( "\n" );
+        Kit_DsdPrint( stdout, pNtk );
+    }
+    for ( i = 0; i < pNtk->nVars; i++ )
+    {
+        Kit_TruthCofactor0New( pCofs2[0], pTruth, pNtk->nVars, i );
+        pNtk0 = Kit_DsdDecompose( pCofs2[0], pNtk->nVars );
+        pNtk0 = Kit_DsdExpand( pTemp = pNtk0 );
+        Kit_DsdNtkFree( pTemp );
+
+        if ( fVerbose )
+        {
+            printf( "Cof%d0: ", i );
+            Kit_DsdPrint( stdout, pNtk0 );
+        }
+
+        Kit_TruthCofactor1New( pCofs2[1], pTruth, pNtk->nVars, i );
+        pNtk1 = Kit_DsdDecompose( pCofs2[1], pNtk->nVars );
+        pNtk1 = Kit_DsdExpand( pTemp = pNtk1 );
+        Kit_DsdNtkFree( pTemp );
+
+        if ( fVerbose )
+        {
+            printf( "Cof%d1: ", i );
+            Kit_DsdPrint( stdout, pNtk1 );
+        }
+
+//        if ( Kit_DsdCheckVar4Dec2( pNtk0, pNtk1 ) )
+//            RetValue = 1;
+
+        Kit_DsdNtkFree( pNtk0 );
+        Kit_DsdNtkFree( pNtk1 );
+    }
+    if ( fVerbose )
+        printf( "\n" );
+
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdEval( unsigned * pTruth, int nVars, int nLutSize )
+{
+    Kit_DsdMan_t * p;
+    Kit_DsdNtk_t * pNtk;
+    unsigned * pTruthC;
+    int Result;
+
+    // decompose the function
+    pNtk = Kit_DsdDecompose( pTruth, nVars );
+    Result = Kit_DsdCountLuts( pNtk, nLutSize );
+//    printf( "\n" );
+//    Kit_DsdPrint( stdout, pNtk );
+//    printf( "Eval = %d.\n", Result );
+
+    // recompute the truth table
+    p = Kit_DsdManAlloc( nVars, Kit_DsdNtkObjNum(pNtk) );
+    pTruthC = Kit_DsdTruthCompute( p, pNtk );
+    if ( !Kit_TruthIsEqual( pTruth, pTruthC, nVars ) )
+        printf( "Verification failed.\n" );
+    Kit_DsdManFree( p );
+
+    Kit_DsdNtkFree( pNtk );
+    return Result;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdVerify( Kit_DsdNtk_t * pNtk, unsigned * pTruth, int nVars )
+{
+    Kit_DsdMan_t * p;
+    unsigned * pTruthC;
+    p = Kit_DsdManAlloc( nVars, Kit_DsdNtkObjNum(pNtk)+2 );
+    pTruthC = Kit_DsdTruthCompute( p, pNtk );
+    if ( !Extra_TruthIsEqual( pTruth, pTruthC, nVars ) )
+        printf( "Verification failed.\n" );
+    Kit_DsdManFree( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdTest( unsigned * pTruth, int nVars )
+{
+    Kit_DsdMan_t * p;
+    unsigned * pTruthC;
+    Kit_DsdNtk_t * pNtk, * pTemp;
+    pNtk = Kit_DsdDecompose( pTruth, nVars );
+
+//    if ( Kit_DsdFindLargeBox(pNtk, Kit_DsdLit2Var(pNtk->Root)) )
+//        Kit_DsdPrint( stdout, pNtk );
+
+//    if ( Kit_DsdNtkRoot(pNtk)->nFans == (unsigned)nVars && nVars == 6 )
+
+    printf( "\n" );
+    Kit_DsdPrint( stdout, pNtk );
+
+    pNtk = Kit_DsdExpand( pTemp = pNtk );
+    Kit_DsdNtkFree( pTemp );
+
+    Kit_DsdPrint( stdout, pNtk );
+
+//    if ( Kit_DsdFindLargeBox(pNtk, Kit_DsdLit2Var(pNtk->Root)) )
+//        Kit_DsdTestCofs( pNtk, pTruth );
+
+    // recompute the truth table
+    p = Kit_DsdManAlloc( nVars, Kit_DsdNtkObjNum(pNtk) );
+    pTruthC = Kit_DsdTruthCompute( p, pNtk );
+//    Extra_PrintBinary( stdout, pTruth, 1 << nVars ); printf( "\n" );
+//    Extra_PrintBinary( stdout, pTruthC, 1 << nVars ); printf( "\n" );
+    if ( Extra_TruthIsEqual( pTruth, pTruthC, nVars ) )
+    {
+//        printf( "Verification is okay.\n" );
+    }
+    else
+        printf( "Verification failed.\n" );
+    Kit_DsdManFree( p );
+
+
+    Kit_DsdNtkFree( pNtk );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Performs decomposition of the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrecompute4Vars()
+{
+    Kit_DsdMan_t * p;
+    Kit_DsdNtk_t * pNtk, * pTemp;
+    FILE * pFile;
+    unsigned uTruth;
+    unsigned * pTruthC;
+    char Buffer[256];
+    int i, RetValue;
+    int Counter1 = 0, Counter2 = 0;
+
+    pFile = fopen( "5npn/npn4.txt", "r" );
+    for ( i = 0; fgets( Buffer, 100, pFile ); i++ )
+    {
+        Buffer[6] = 0;
+        Extra_ReadHexadecimal( &uTruth, Buffer+2, 4 );
+        uTruth = ((uTruth & 0xffff) << 16) | (uTruth & 0xffff);
+        pNtk = Kit_DsdDecompose( &uTruth, 4 );
+
+        pNtk = Kit_DsdExpand( pTemp = pNtk );
+        Kit_DsdNtkFree( pTemp );
+
+
+        if ( Kit_DsdFindLargeBox(pNtk, 3) )
+        {
+//            RetValue = 0;
+            RetValue = Kit_DsdTestCofs( pNtk, &uTruth );
+            printf( "\n" );
+            printf( "%3d : Non-DSD function  %s  %s\n", i, Buffer + 2, RetValue? "implementable" : "" );
+            Kit_DsdPrint( stdout, pNtk );
+
+            Counter1++;
+            Counter2 += RetValue;
+        }
+
+/*
+        printf( "%3d : Function  %s   ", i, Buffer + 2 );
+        if ( !Kit_DsdFindLargeBox(pNtk, 3) )
+            Kit_DsdPrint( stdout, pNtk );
+        else
+            printf( "\n" );
+*/
+
+        p = Kit_DsdManAlloc( 4, Kit_DsdNtkObjNum(pNtk) );
+        pTruthC = Kit_DsdTruthCompute( p, pNtk );
+        if ( !Extra_TruthIsEqual( &uTruth, pTruthC, 4 ) )
+            printf( "Verification failed.\n" );
+        Kit_DsdManFree( p );
+
+        Kit_DsdNtkFree( pNtk );
+    }
+    fclose( pFile );
+    printf( "non-DSD = %d   implementable = %d\n", Counter1, Counter2 );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the set of cofactoring variables.]
+
+  Description [If there is no DSD components returns 0.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdCofactoringGetVars( Kit_DsdNtk_t ** ppNtk, int nSize, int * pVars )
+{
+    Kit_DsdObj_t * pObj;
+    unsigned m;
+    int i, k, v, Var, nVars, iFaninLit;
+    // go through all the networks
+    nVars = 0;
+    for ( i = 0; i < nSize; i++ )
+    {
+        // go through the prime objects of each networks
+        Kit_DsdNtkForEachObj( ppNtk[i], pObj, k )     
+        {
+            if ( pObj->Type != KIT_DSD_PRIME )
+                continue;
+            if ( pObj->nFans == 3 )
+                continue;
+            // collect direct fanin variables
+            Kit_DsdObjForEachFanin( ppNtk[i], pObj, iFaninLit, m )
+            {
+                if ( !Kit_DsdLitIsLeaf(ppNtk[i], iFaninLit) )
+                    continue;
+                // add it to the array
+                Var = Kit_DsdLit2Var( iFaninLit );
+                for ( v = 0; v < nVars; v++ )
+                    if ( pVars[v] == Var )
+                        break;
+                if ( v == nVars )
+                    pVars[nVars++] = Var;
+            }
+        }
+    }
+    return nVars;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Canonical decomposition into completely DSD-structure.]
+
+  Description [Returns the number of cofactoring steps. Also returns
+  the cofactoring variables in pVars.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_DsdCofactoring( unsigned * pTruth, int nVars, int * pCofVars, int nLimit, int fVerbose )
+{
+    Kit_DsdNtk_t * ppNtks[5][16] = {0}, * pTemp;
+    unsigned * ppCofs[5][16];
+    int pTryVars[16], nTryVars;
+    int nPrimeSizeMin, nPrimeSizeMax, nPrimeSizeCur;
+    int nSuppSizeMin, nSuppSizeMax, iVarBest;
+    int i, k, v, nStep, nSize, nMemSize;
+    assert( nLimit < 5 );
+
+    // allocate storage for cofactors
+    nMemSize = Kit_TruthWordNum(nVars);
+    ppCofs[0][0] = ALLOC( unsigned, 80 * nMemSize );
+    nSize = 0;
+    for ( i = 0; i <  5; i++ )
+    for ( k = 0; k < 16; k++ )
+        ppCofs[i][k] = ppCofs[0][0] + nMemSize * nSize++;
+    assert( nSize == 80 );
+
+    // copy the function
+    Kit_TruthCopy( ppCofs[0][0], pTruth, nVars );
+    ppNtks[0][0] = Kit_DsdDecompose( ppCofs[0][0], nVars );
+
+    if ( fVerbose )
+        printf( "\nProcessing prime function with %d support variables:\n", nVars );
+
+    // perform recursive cofactoring
+    for ( nStep = 0; nStep < nLimit; nStep++ )
+    {
+        nSize = (1 << nStep);
+        // find the variables to use in the cofactoring step
+        nTryVars = Kit_DsdCofactoringGetVars( ppNtks[nStep], nSize, pTryVars );
+        if ( nTryVars == 0 )
+            break;
+        // cofactor w.r.t. the above variables
+        iVarBest = -1;
+        nPrimeSizeMin = 10000;
+        nSuppSizeMin  = 10000;
+        for ( v = 0; v < nTryVars; v++ )
+        {
+            nPrimeSizeMax = 0;
+            nSuppSizeMax = 0;
+            for ( i = 0; i < nSize; i++ )
+            {
+                // cofactor and decompose cofactors          
+                Kit_TruthCofactor0New( ppCofs[nStep+1][2*i+0], ppCofs[nStep][i], nVars, pTryVars[v] );
+                Kit_TruthCofactor1New( ppCofs[nStep+1][2*i+1], ppCofs[nStep][i], nVars, pTryVars[v] );
+                ppNtks[nStep+1][2*i+0] = Kit_DsdDecompose( ppCofs[nStep+1][2*i+0], nVars );
+                ppNtks[nStep+1][2*i+1] = Kit_DsdDecompose( ppCofs[nStep+1][2*i+1], nVars );
+                // compute the largest non-decomp block
+                nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[nStep+1][2*i+0]);
+                nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+                nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[nStep+1][2*i+1]);
+                nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+                // compute the sum total of supports
+                nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nStep+1][2*i+0], nVars );
+                nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nStep+1][2*i+1], nVars );
+                // free the networks
+                Kit_DsdNtkFree( ppNtks[nStep+1][2*i+0] );
+                Kit_DsdNtkFree( ppNtks[nStep+1][2*i+1] );
+            }
+            // find the min max support size of the prime component
+            if ( nPrimeSizeMin > nPrimeSizeMax || (nPrimeSizeMin == nPrimeSizeMax && nSuppSizeMin > nSuppSizeMax) )
+            {
+                nPrimeSizeMin = nPrimeSizeMax;
+                nSuppSizeMin  = nSuppSizeMax;
+                iVarBest      = pTryVars[v];
+            }
+        }
+        assert( iVarBest != -1 );
+        // save the variable
+        if ( pCofVars )
+            pCofVars[nStep] = iVarBest;
+        // cofactor w.r.t. the best
+        for ( i = 0; i < nSize; i++ )
+        {
+            Kit_TruthCofactor0New( ppCofs[nStep+1][2*i+0], ppCofs[nStep][i], nVars, iVarBest );
+            Kit_TruthCofactor1New( ppCofs[nStep+1][2*i+1], ppCofs[nStep][i], nVars, iVarBest );
+            ppNtks[nStep+1][2*i+0] = Kit_DsdDecompose( ppCofs[nStep+1][2*i+0], nVars );
+            ppNtks[nStep+1][2*i+1] = Kit_DsdDecompose( ppCofs[nStep+1][2*i+1], nVars );
+            if ( fVerbose )
+            {
+                ppNtks[nStep+1][2*i+0] = Kit_DsdExpand( pTemp = ppNtks[nStep+1][2*i+0] );
+                Kit_DsdNtkFree( pTemp );
+                ppNtks[nStep+1][2*i+1] = Kit_DsdExpand( pTemp = ppNtks[nStep+1][2*i+1] );
+                Kit_DsdNtkFree( pTemp );
+
+                printf( "Cof%d%d: ", nStep+1, 2*i+0 );
+                Kit_DsdPrint( stdout, ppNtks[nStep+1][2*i+0] );
+                printf( "Cof%d%d: ", nStep+1, 2*i+1 );
+                Kit_DsdPrint( stdout, ppNtks[nStep+1][2*i+1] );
+            }
+        }
+    }
+
+    // free the networks
+    for ( i = 0; i <  5; i++ )
+    for ( k = 0; k < 16; k++ )
+        if ( ppNtks[i][k] )
+            Kit_DsdNtkFree( ppNtks[i][k] );
+    free( ppCofs[0][0] );
+
+    assert( nStep <= nLimit );
+    return nStep;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Canonical decomposition into completely DSD-structure.]
+
+  Description [Returns the number of cofactoring steps. Also returns
+  the cofactoring variables in pVars.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_DsdPrintCofactors( unsigned * pTruth, int nVars, int nCofLevel, int fVerbose )
+{
+    Kit_DsdNtk_t * ppNtks[32] = {0}, * pTemp;
+    unsigned * ppCofs[5][16];
+    int piCofVar[5];
+    int nPrimeSizeMax, nPrimeSizeCur, nSuppSizeMax;
+    int i, k, v1, v2, v3, v4, s, nSteps, nSize, nMemSize;
+    assert( nCofLevel < 5 );
+
+    // print the function
+    ppNtks[0] = Kit_DsdDecompose( pTruth, nVars );
+    ppNtks[0] = Kit_DsdExpand( pTemp = ppNtks[0] );
+    Kit_DsdNtkFree( pTemp );
+    if ( fVerbose )
+        Kit_DsdPrint( stdout, ppNtks[0] );
+    Kit_DsdNtkFree( ppNtks[0] );
+
+    // allocate storage for cofactors
+    nMemSize = Kit_TruthWordNum(nVars);
+    ppCofs[0][0] = ALLOC( unsigned, 80 * nMemSize );
+    nSize = 0;
+    for ( i = 0; i <  5; i++ )
+    for ( k = 0; k < 16; k++ )
+        ppCofs[i][k] = ppCofs[0][0] + nMemSize * nSize++;
+    assert( nSize == 80 );
+
+    // copy the function
+    Kit_TruthCopy( ppCofs[0][0], pTruth, nVars );
+
+    if ( nCofLevel == 1 )
+    for ( v1 = 0; v1 < nVars; v1++ )
+    {
+        nSteps = 0;
+        piCofVar[nSteps++] = v1;
+
+        printf( "    Variables { " );
+        for ( i = 0; i < nSteps; i++ )
+            printf( "%c ", 'a' + piCofVar[i] );
+        printf( "}\n" );
+
+        // single cofactors
+        for ( s = 1; s <= nSteps; s++ )
+        {
+            for ( k = 0; k < s; k++ )
+            {
+                nSize = (1 << k);
+                for ( i = 0; i < nSize; i++ )
+                {
+                    Kit_TruthCofactor0New( ppCofs[k+1][2*i+0], ppCofs[k][i], nVars, piCofVar[k] );
+                    Kit_TruthCofactor1New( ppCofs[k+1][2*i+1], ppCofs[k][i], nVars, piCofVar[k] );
+                }
+            }
+        }
+        // compute DSD networks
+        nSize = (1 << nSteps);
+        nPrimeSizeMax = 0;
+        nSuppSizeMax = 0;
+        for ( i = 0; i < nSize; i++ )
+        {
+            ppNtks[i] = Kit_DsdDecompose( ppCofs[nSteps][i], nVars );
+            ppNtks[i] = Kit_DsdExpand( pTemp = ppNtks[i] );
+            Kit_DsdNtkFree( pTemp );
+            if ( fVerbose )
+            {
+                printf( "Cof%d%d: ", nSteps, i );
+                Kit_DsdPrint( stdout, ppNtks[i] );
+            }
+            // compute the largest non-decomp block
+            nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[i]);
+            nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+            Kit_DsdNtkFree( ppNtks[i] );
+            nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nSteps][i], nVars );
+        }
+        printf( "Max = %2d. Supps = %2d.\n", nPrimeSizeMax, nSuppSizeMax );
+    }
+
+    if ( nCofLevel == 2 )
+    for ( v1 = 0; v1 < nVars; v1++ )
+    for ( v2 = v1+1; v2 < nVars; v2++ )
+    {
+        nSteps = 0;
+        piCofVar[nSteps++] = v1;
+        piCofVar[nSteps++] = v2;
+
+        printf( "    Variables { " );
+        for ( i = 0; i < nSteps; i++ )
+            printf( "%c ", 'a' + piCofVar[i] );
+        printf( "}\n" );
+
+        // single cofactors
+        for ( s = 1; s <= nSteps; s++ )
+        {
+            for ( k = 0; k < s; k++ )
+            {
+                nSize = (1 << k);
+                for ( i = 0; i < nSize; i++ )
+                {
+                    Kit_TruthCofactor0New( ppCofs[k+1][2*i+0], ppCofs[k][i], nVars, piCofVar[k] );
+                    Kit_TruthCofactor1New( ppCofs[k+1][2*i+1], ppCofs[k][i], nVars, piCofVar[k] );
+                }
+            }
+        }
+        // compute DSD networks
+        nSize = (1 << nSteps);
+        nPrimeSizeMax = 0;
+        nSuppSizeMax = 0;
+        for ( i = 0; i < nSize; i++ )
+        {
+            ppNtks[i] = Kit_DsdDecompose( ppCofs[nSteps][i], nVars );
+            ppNtks[i] = Kit_DsdExpand( pTemp = ppNtks[i] );
+            Kit_DsdNtkFree( pTemp );
+            if ( fVerbose )
+            {
+                printf( "Cof%d%d: ", nSteps, i );
+                Kit_DsdPrint( stdout, ppNtks[i] );
+            }
+            // compute the largest non-decomp block
+            nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[i]);
+            nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+            Kit_DsdNtkFree( ppNtks[i] );
+            nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nSteps][i], nVars );
+        }
+        printf( "Max = %2d. Supps = %2d.\n", nPrimeSizeMax, nSuppSizeMax );
+    }
+
+    if ( nCofLevel == 3 )
+    for ( v1 = 0; v1 < nVars; v1++ )
+    for ( v2 = v1+1; v2 < nVars; v2++ )
+    for ( v3 = v2+1; v3 < nVars; v3++ )
+    {
+        nSteps = 0;
+        piCofVar[nSteps++] = v1;
+        piCofVar[nSteps++] = v2;
+        piCofVar[nSteps++] = v3;
+
+        printf( "    Variables { " );
+        for ( i = 0; i < nSteps; i++ )
+            printf( "%c ", 'a' + piCofVar[i] );
+        printf( "}\n" );
+
+        // single cofactors
+        for ( s = 1; s <= nSteps; s++ )
+        {
+            for ( k = 0; k < s; k++ )
+            {
+                nSize = (1 << k);
+                for ( i = 0; i < nSize; i++ )
+                {
+                    Kit_TruthCofactor0New( ppCofs[k+1][2*i+0], ppCofs[k][i], nVars, piCofVar[k] );
+                    Kit_TruthCofactor1New( ppCofs[k+1][2*i+1], ppCofs[k][i], nVars, piCofVar[k] );
+                }
+            }
+        }
+        // compute DSD networks
+        nSize = (1 << nSteps);
+        nPrimeSizeMax = 0;
+        nSuppSizeMax = 0;
+        for ( i = 0; i < nSize; i++ )
+        {
+            ppNtks[i] = Kit_DsdDecompose( ppCofs[nSteps][i], nVars );
+            ppNtks[i] = Kit_DsdExpand( pTemp = ppNtks[i] );
+            Kit_DsdNtkFree( pTemp );
+            if ( fVerbose )
+            {
+                printf( "Cof%d%d: ", nSteps, i );
+                Kit_DsdPrint( stdout, ppNtks[i] );
+            }
+            // compute the largest non-decomp block
+            nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[i]);
+            nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+            Kit_DsdNtkFree( ppNtks[i] );
+            nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nSteps][i], nVars );
+        }
+        printf( "Max = %2d. Supps = %2d.\n", nPrimeSizeMax, nSuppSizeMax );
+    }
+
+    if ( nCofLevel == 4 )
+    for ( v1 = 0; v1 < nVars; v1++ )
+    for ( v2 = v1+1; v2 < nVars; v2++ )
+    for ( v3 = v2+1; v3 < nVars; v3++ )
+    for ( v4 = v3+1; v4 < nVars; v4++ )
+    {
+        nSteps = 0;
+        piCofVar[nSteps++] = v1;
+        piCofVar[nSteps++] = v2;
+        piCofVar[nSteps++] = v3;
+        piCofVar[nSteps++] = v4;
+
+        printf( "    Variables { " );
+        for ( i = 0; i < nSteps; i++ )
+            printf( "%c ", 'a' + piCofVar[i] );
+        printf( "}\n" );
+
+        // single cofactors
+        for ( s = 1; s <= nSteps; s++ )
+        {
+            for ( k = 0; k < s; k++ )
+            {
+                nSize = (1 << k);
+                for ( i = 0; i < nSize; i++ )
+                {
+                    Kit_TruthCofactor0New( ppCofs[k+1][2*i+0], ppCofs[k][i], nVars, piCofVar[k] );
+                    Kit_TruthCofactor1New( ppCofs[k+1][2*i+1], ppCofs[k][i], nVars, piCofVar[k] );
+                }
+            }
+        }
+        // compute DSD networks
+        nSize = (1 << nSteps);
+        nPrimeSizeMax = 0;
+        nSuppSizeMax = 0;
+        for ( i = 0; i < nSize; i++ )
+        {
+            ppNtks[i] = Kit_DsdDecompose( ppCofs[nSteps][i], nVars );
+            ppNtks[i] = Kit_DsdExpand( pTemp = ppNtks[i] );
+            Kit_DsdNtkFree( pTemp );
+            if ( fVerbose )
+            {
+                printf( "Cof%d%d: ", nSteps, i );
+                Kit_DsdPrint( stdout, ppNtks[i] );
+            }
+            // compute the largest non-decomp block
+            nPrimeSizeCur  = Kit_DsdNonDsdSizeMax(ppNtks[i]);
+            nPrimeSizeMax  = KIT_MAX( nPrimeSizeMax, nPrimeSizeCur );
+            Kit_DsdNtkFree( ppNtks[i] );
+            nSuppSizeMax += Kit_TruthSupportSize( ppCofs[nSteps][i], nVars );
+        }
+        printf( "Max = %2d. Supps = %2d.\n", nPrimeSizeMax, nSuppSizeMax );
+    }
+
+
+    free( ppCofs[0][0] );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitFactor.c b/abc70930/src/aig/kit/kitFactor.c
new file mode 100644
index 00000000..e3288342
--- /dev/null
+++ b/abc70930/src/aig/kit/kitFactor.c
@@ -0,0 +1,339 @@
+/**CFile****************************************************************
+
+  FileName    [kitFactor.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Algebraic factoring.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitFactor.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// factoring fails if intermediate memory usage exceed this limit
+#define KIT_FACTOR_MEM_LIMIT  (1<<16)
+
+static Kit_Edge_t  Kit_SopFactor_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory );
+static Kit_Edge_t  Kit_SopFactorLF_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, Kit_Sop_t * cSimple, int nLits, Vec_Int_t * vMemory );
+static Kit_Edge_t  Kit_SopFactorTrivial( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits );
+static Kit_Edge_t  Kit_SopFactorTrivialCube( Kit_Graph_t * pFForm, unsigned uCube, int nLits );
+
+extern int         Kit_SopFactorVerify( Vec_Int_t * cSop, Kit_Graph_t * pFForm, int nVars );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Factors the cover.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_SopFactor( Vec_Int_t * vCover, int fCompl, int nVars, Vec_Int_t * vMemory )
+{
+    Kit_Sop_t Sop, * cSop = &Sop;
+    Kit_Graph_t * pFForm;
+    Kit_Edge_t eRoot;
+//    int nCubes;
+
+    // works for up to 15 variables because divisin procedure
+    // used the last bit for marking the cubes going to the remainder
+    assert( nVars < 16 );
+
+    // check for trivial functions
+    if ( Vec_IntSize(vCover) == 0 )
+        return Kit_GraphCreateConst0();
+    if ( Vec_IntSize(vCover) == 1 && Vec_IntEntry(vCover, 0) == 0 )
+        return Kit_GraphCreateConst1();
+
+    // prepare memory manager
+//    Vec_IntClear( vMemory );
+    Vec_IntGrow( vMemory, KIT_FACTOR_MEM_LIMIT );
+
+    // perform CST
+    Kit_SopCreateInverse( cSop, vCover, 2 * nVars, vMemory ); // CST
+
+    // start the factored form
+    pFForm = Kit_GraphCreate( nVars );
+    // factor the cover
+    eRoot = Kit_SopFactor_rec( pFForm, cSop, 2 * nVars, vMemory );
+    // finalize the factored form
+    Kit_GraphSetRoot( pFForm, eRoot );
+    if ( fCompl )
+        Kit_GraphComplement( pFForm );
+
+    // verify the factored form
+//    nCubes = Vec_IntSize(vCover);
+//    Vec_IntShrink( vCover, nCubes );
+//    if ( !Kit_SopFactorVerify( vCover, pFForm, nVars ) )
+//        printf( "Verification has failed.\n" );
+    return pFForm;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursive factoring procedure.]
+
+  Description [For the pseudo-code, see Hachtel/Somenzi, 
+  Logic synthesis and verification algorithms, Kluwer, 1996, p. 432.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactor_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory )
+{
+    Kit_Sop_t Div, Quo, Rem, Com;
+    Kit_Sop_t * cDiv = &Div, * cQuo = &Quo, * cRem = &Rem, * cCom = &Com;
+    Kit_Edge_t eNodeDiv, eNodeQuo, eNodeRem, eNodeAnd;
+
+    // make sure the cover contains some cubes
+    assert( Kit_SopCubeNum(cSop) > 0 );
+
+    // get the divisor
+    if ( !Kit_SopDivisor(cDiv, cSop, nLits, vMemory) )
+        return Kit_SopFactorTrivial( pFForm, cSop, nLits );
+
+    // divide the cover by the divisor
+    Kit_SopDivideInternal( cSop, cDiv, cQuo, cRem, vMemory );
+
+    // check the trivial case
+    assert( Kit_SopCubeNum(cQuo) > 0 );
+    if ( Kit_SopCubeNum(cQuo) == 1 )
+        return Kit_SopFactorLF_rec( pFForm, cSop, cQuo, nLits, vMemory );
+
+    // make the quotient cube free
+    Kit_SopMakeCubeFree( cQuo );
+
+    // divide the cover by the quotient
+    Kit_SopDivideInternal( cSop, cQuo, cDiv, cRem, vMemory );
+
+    // check the trivial case
+    if ( Kit_SopIsCubeFree( cDiv ) )
+    {
+        eNodeDiv = Kit_SopFactor_rec( pFForm, cDiv, nLits, vMemory );
+        eNodeQuo = Kit_SopFactor_rec( pFForm, cQuo, nLits, vMemory );
+        eNodeAnd = Kit_GraphAddNodeAnd( pFForm, eNodeDiv, eNodeQuo );
+        if ( Kit_SopCubeNum(cRem) == 0 )
+            return eNodeAnd;
+        eNodeRem = Kit_SopFactor_rec( pFForm, cRem, nLits, vMemory );
+        return Kit_GraphAddNodeOr( pFForm, eNodeAnd, eNodeRem );
+    }
+
+    // get the common cube
+    Kit_SopCommonCubeCover( cCom, cDiv, vMemory );
+
+    // solve the simple problem
+    return Kit_SopFactorLF_rec( pFForm, cSop, cCom, nLits, vMemory );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Internal recursive factoring procedure for the leaf case.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactorLF_rec( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, Kit_Sop_t * cSimple, int nLits, Vec_Int_t * vMemory )
+{
+    Kit_Sop_t Div, Quo, Rem;
+    Kit_Sop_t * cDiv = &Div, * cQuo = &Quo, * cRem = &Rem;
+    Kit_Edge_t eNodeDiv, eNodeQuo, eNodeRem, eNodeAnd;
+    assert( Kit_SopCubeNum(cSimple) == 1 );
+    // get the most often occurring literal
+    Kit_SopBestLiteralCover( cDiv, cSop, Kit_SopCube(cSimple, 0), nLits, vMemory );
+    // divide the cover by the literal
+    Kit_SopDivideByCube( cSop, cDiv, cQuo, cRem, vMemory );
+    // get the node pointer for the literal
+    eNodeDiv = Kit_SopFactorTrivialCube( pFForm, Kit_SopCube(cDiv, 0), nLits );
+    // factor the quotient and remainder
+    eNodeQuo = Kit_SopFactor_rec( pFForm, cQuo, nLits, vMemory );
+    eNodeAnd = Kit_GraphAddNodeAnd( pFForm, eNodeDiv, eNodeQuo );
+    if ( Kit_SopCubeNum(cRem) == 0 )
+        return eNodeAnd;
+    eNodeRem = Kit_SopFactor_rec( pFForm, cRem, nLits, vMemory );
+    return Kit_GraphAddNodeOr( pFForm, eNodeAnd, eNodeRem );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Factoring cube.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactorTrivialCube_rec( Kit_Graph_t * pFForm, unsigned uCube, int nStart, int nFinish )
+{
+    Kit_Edge_t eNode1, eNode2;
+    int i, iLit = -1, nLits, nLits1, nLits2;
+    assert( uCube );
+    // count the number of literals in this interval
+    nLits = 0;
+    for ( i = nStart; i < nFinish; i++ )
+        if ( Kit_CubeHasLit(uCube, i) )
+        {
+            iLit = i;
+            nLits++;
+        }
+    assert( iLit != -1 );
+    // quit if there is only one literal        
+    if ( nLits == 1 )
+        return Kit_EdgeCreate( iLit/2, iLit%2 ); // CST
+    // split the literals into two parts
+    nLits1 = nLits/2;
+    nLits2 = nLits - nLits1;
+//    nLits2 = nLits/2;
+//    nLits1 = nLits - nLits2;
+    // find the splitting point
+    nLits = 0;
+    for ( i = nStart; i < nFinish; i++ )
+        if ( Kit_CubeHasLit(uCube, i) )
+        {
+            if ( nLits == nLits1 )
+                break;
+            nLits++;
+        }
+    // recursively construct the tree for the parts
+    eNode1 = Kit_SopFactorTrivialCube_rec( pFForm, uCube, nStart, i  );
+    eNode2 = Kit_SopFactorTrivialCube_rec( pFForm, uCube, i, nFinish );
+    return Kit_GraphAddNodeAnd( pFForm, eNode1, eNode2 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Factoring cube.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactorTrivialCube( Kit_Graph_t * pFForm, unsigned uCube, int nLits )
+{
+    return Kit_SopFactorTrivialCube_rec( pFForm, uCube, 0, nLits );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Factoring SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactorTrivial_rec( Kit_Graph_t * pFForm, unsigned * pCubes, int nCubes, int nLits )
+{
+    Kit_Edge_t eNode1, eNode2;
+    int nCubes1, nCubes2;
+    if ( nCubes == 1 )
+        return Kit_SopFactorTrivialCube_rec( pFForm, pCubes[0], 0, nLits );
+    // split the cubes into two parts
+    nCubes1 = nCubes/2;
+    nCubes2 = nCubes - nCubes1;
+//    nCubes2 = nCubes/2;
+//    nCubes1 = nCubes - nCubes2;
+    // recursively construct the tree for the parts
+    eNode1 = Kit_SopFactorTrivial_rec( pFForm, pCubes,           nCubes1, nLits );
+    eNode2 = Kit_SopFactorTrivial_rec( pFForm, pCubes + nCubes1, nCubes2, nLits );
+    return Kit_GraphAddNodeOr( pFForm, eNode1, eNode2 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Factoring the cover, which has no algebraic divisors.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_SopFactorTrivial( Kit_Graph_t * pFForm, Kit_Sop_t * cSop, int nLits )
+{
+    return Kit_SopFactorTrivial_rec( pFForm, cSop->pCubes, cSop->nCubes, nLits );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Testing procedure for the factoring code.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_FactorTest( unsigned * pTruth, int nVars )
+{
+    Vec_Int_t * vCover, * vMemory;
+    Kit_Graph_t * pGraph;
+//    unsigned uTruthRes;
+    int RetValue;
+
+    // derive SOP
+    vCover = Vec_IntAlloc( 0 );
+    RetValue = Kit_TruthIsop( pTruth, nVars, vCover, 0 );
+    assert( RetValue == 0 );
+
+    // derive factored form
+    vMemory = Vec_IntAlloc( 0 );
+    pGraph = Kit_SopFactor( vCover, 0, nVars, vMemory );
+/*
+    // derive truth table
+    assert( nVars <= 5 );
+    uTruthRes = Kit_GraphToTruth( pGraph );
+    if ( uTruthRes != pTruth[0] )
+        printf( "Verification failed!" );
+*/
+    printf( "Vars = %2d. Cubes = %3d. FFNodes = %3d. FF_memory = %3d.\n",
+        nVars, Vec_IntSize(vCover), Kit_GraphNodeNum(pGraph), Vec_IntSize(vMemory) );
+
+    Vec_IntFree( vMemory );
+    Vec_IntFree( vCover );
+    Kit_GraphFree( pGraph );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitGraph.c b/abc70930/src/aig/kit/kitGraph.c
new file mode 100644
index 00000000..80dcbdc0
--- /dev/null
+++ b/abc70930/src/aig/kit/kitGraph.c
@@ -0,0 +1,397 @@
+/**CFile****************************************************************
+
+  FileName    [kitGraph.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Decomposition graph representation.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitGraph.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates a graph with the given number of leaves.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_GraphCreate( int nLeaves )   
+{
+    Kit_Graph_t * pGraph;
+    pGraph = ALLOC( Kit_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Kit_Graph_t) );
+    pGraph->nLeaves = nLeaves;
+    pGraph->nSize = nLeaves;
+    pGraph->nCap = 2 * nLeaves + 50;
+    pGraph->pNodes = ALLOC( Kit_Node_t, pGraph->nCap );
+    memset( pGraph->pNodes, 0, sizeof(Kit_Node_t) * pGraph->nSize );
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates constant 0 graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_GraphCreateConst0()   
+{
+    Kit_Graph_t * pGraph;
+    pGraph = ALLOC( Kit_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Kit_Graph_t) );
+    pGraph->fConst = 1;
+    pGraph->eRoot.fCompl = 1;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates constant 1 graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_GraphCreateConst1()   
+{
+    Kit_Graph_t * pGraph;
+    pGraph = ALLOC( Kit_Graph_t, 1 );
+    memset( pGraph, 0, sizeof(Kit_Graph_t) );
+    pGraph->fConst = 1;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the literal graph.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_GraphCreateLeaf( int iLeaf, int nLeaves, int fCompl )   
+{
+    Kit_Graph_t * pGraph;
+    assert( 0 <= iLeaf && iLeaf < nLeaves );
+    pGraph = Kit_GraphCreate( nLeaves );
+    pGraph->eRoot.Node   = iLeaf;
+    pGraph->eRoot.fCompl = fCompl;
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates a graph with the given number of leaves.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_GraphFree( Kit_Graph_t * pGraph )   
+{
+    FREE( pGraph->pNodes );
+    free( pGraph );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Appends a new node to the graph.]
+
+  Description [This procedure is meant for internal use.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Node_t * Kit_GraphAppendNode( Kit_Graph_t * pGraph )   
+{
+    Kit_Node_t * pNode;
+    if ( pGraph->nSize == pGraph->nCap )
+    {
+        pGraph->pNodes = REALLOC( Kit_Node_t, pGraph->pNodes, 2 * pGraph->nCap ); 
+        pGraph->nCap   = 2 * pGraph->nCap;
+    }
+    pNode = pGraph->pNodes + pGraph->nSize++;
+    memset( pNode, 0, sizeof(Kit_Node_t) );
+    return pNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an AND node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_GraphAddNodeAnd( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1 )
+{
+    Kit_Node_t * pNode;
+    // get the new node
+    pNode = Kit_GraphAppendNode( pGraph );
+    // set the inputs and other info
+    pNode->eEdge0 = eEdge0;
+    pNode->eEdge1 = eEdge1;
+    pNode->fCompl0 = eEdge0.fCompl;
+    pNode->fCompl1 = eEdge1.fCompl;
+    return Kit_EdgeCreate( pGraph->nSize - 1, 0 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an OR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_GraphAddNodeOr( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1 )
+{
+    Kit_Node_t * pNode;
+    // get the new node
+    pNode = Kit_GraphAppendNode( pGraph );
+    // set the inputs and other info
+    pNode->eEdge0 = eEdge0;
+    pNode->eEdge1 = eEdge1;
+    pNode->fCompl0 = eEdge0.fCompl;
+    pNode->fCompl1 = eEdge1.fCompl;
+    // make adjustments for the OR gate
+    pNode->fNodeOr = 1;
+    pNode->eEdge0.fCompl = !pNode->eEdge0.fCompl;
+    pNode->eEdge1.fCompl = !pNode->eEdge1.fCompl;
+    return Kit_EdgeCreate( pGraph->nSize - 1, 1 );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an XOR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_GraphAddNodeXor( Kit_Graph_t * pGraph, Kit_Edge_t eEdge0, Kit_Edge_t eEdge1, int Type )
+{
+    Kit_Edge_t eNode0, eNode1, eNode;
+    if ( Type == 0 )
+    {
+        // derive the first AND
+        eEdge0.fCompl ^= 1;
+        eNode0 = Kit_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        eEdge0.fCompl ^= 1;
+        // derive the second AND
+        eEdge1.fCompl ^= 1;
+        eNode1 = Kit_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the final OR
+        eNode = Kit_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+    }
+    else
+    {
+        // derive the first AND
+        eNode0 = Kit_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the second AND
+        eEdge0.fCompl ^= 1;
+        eEdge1.fCompl ^= 1;
+        eNode1 = Kit_GraphAddNodeAnd( pGraph, eEdge0, eEdge1 );
+        // derive the final OR
+        eNode = Kit_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+        eNode.fCompl ^= 1;
+    }
+    return eNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates an XOR node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Edge_t Kit_GraphAddNodeMux( Kit_Graph_t * pGraph, Kit_Edge_t eEdgeC, Kit_Edge_t eEdgeT, Kit_Edge_t eEdgeE, int Type )
+{
+    Kit_Edge_t eNode0, eNode1, eNode;
+    if ( Type == 0 )
+    {
+        // derive the first AND
+        eNode0 = Kit_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeT );
+        // derive the second AND
+        eEdgeC.fCompl ^= 1;
+        eNode1 = Kit_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeE );
+        // derive the final OR
+        eNode = Kit_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+    }
+    else
+    {
+        // complement the arguments
+        eEdgeT.fCompl ^= 1;
+        eEdgeE.fCompl ^= 1;
+        // derive the first AND
+        eNode0 = Kit_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeT );
+        // derive the second AND
+        eEdgeC.fCompl ^= 1;
+        eNode1 = Kit_GraphAddNodeAnd( pGraph, eEdgeC, eEdgeE );
+        // derive the final OR
+        eNode = Kit_GraphAddNodeOr( pGraph, eNode0, eNode1 );
+        eNode.fCompl ^= 1;
+    }
+    return eNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_GraphToTruth( Kit_Graph_t * pGraph )
+{
+    unsigned uTruths[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    unsigned uTruth = 0, uTruth0, uTruth1;
+    Kit_Node_t * pNode;
+    int i;
+
+    // sanity checks
+    assert( Kit_GraphLeaveNum(pGraph) >= 0 );
+    assert( Kit_GraphLeaveNum(pGraph) <= pGraph->nSize );
+    assert( Kit_GraphLeaveNum(pGraph) <= 5 );
+
+    // check for constant function
+    if ( Kit_GraphIsConst(pGraph) )
+        return Kit_GraphIsComplement(pGraph)? 0 : ~((unsigned)0);
+    // check for a literal
+    if ( Kit_GraphIsVar(pGraph) )
+        return Kit_GraphIsComplement(pGraph)? ~uTruths[Kit_GraphVarInt(pGraph)] : uTruths[Kit_GraphVarInt(pGraph)];
+
+    // assign the elementary variables
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->pFunc = (void *)(long)uTruths[i];
+
+    // compute the function for each internal node
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        uTruth0 = (unsigned)(long)Kit_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc;
+        uTruth1 = (unsigned)(long)Kit_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc;
+        uTruth0 = pNode->eEdge0.fCompl? ~uTruth0 : uTruth0;
+        uTruth1 = pNode->eEdge1.fCompl? ~uTruth1 : uTruth1;
+        uTruth = uTruth0 & uTruth1;
+        pNode->pFunc = (void *)(long)uTruth;
+    }
+
+    // complement the result if necessary
+    return Kit_GraphIsComplement(pGraph)? ~uTruth : uTruth;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the factored form from the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Kit_Graph_t * Kit_TruthToGraph( unsigned * pTruth, int nVars, Vec_Int_t * vMemory )
+{
+    Kit_Graph_t * pGraph;
+    int RetValue;
+    // derive SOP
+    RetValue = Kit_TruthIsop( pTruth, nVars, vMemory, 1 ); // tried 1 and found not useful in "renode"
+    if ( RetValue == -1 )
+        return NULL;
+    if ( Vec_IntSize(vMemory) > 128 )
+        return NULL;
+//    printf( "Isop size = %d.\n", Vec_IntSize(vMemory) );
+    assert( RetValue == 0 || RetValue == 1 );
+    // derive factored form
+    pGraph = Kit_SopFactor( vMemory, RetValue, nVars, vMemory );
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the maximum depth from the leaf to the root.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_GraphLeafDepth_rec( Kit_Graph_t * pGraph, Kit_Node_t * pNode, Kit_Node_t * pLeaf )
+{
+    int Depth0, Depth1, Depth;
+    if ( pNode == pLeaf )
+        return 0;
+    if ( Kit_GraphNodeIsVar(pGraph, pNode) )
+        return -100;
+    Depth0 = Kit_GraphLeafDepth_rec( pGraph, Kit_GraphNodeFanin0(pGraph, pNode), pLeaf );
+    Depth1 = Kit_GraphLeafDepth_rec( pGraph, Kit_GraphNodeFanin1(pGraph, pNode), pLeaf );
+    Depth = KIT_MAX( Depth0, Depth1 );
+    Depth = (Depth == -100) ? -100 : Depth + 1;
+    return Depth;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/kit/kitHop.c b/abc70930/src/aig/kit/kitHop.c
new file mode 100644
index 00000000..86ec5a88
--- /dev/null
+++ b/abc70930/src/aig/kit/kitHop.c
@@ -0,0 +1,144 @@
+/**CFile****************************************************************
+
+  FileName    [kitHop.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures involving AIGs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitHop.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+#include "hop.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Transforms the decomposition graph into the AIG.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Kit_GraphToHopInternal( Hop_Man_t * pMan, Kit_Graph_t * pGraph )
+{
+    Kit_Node_t * pNode = NULL;
+    Hop_Obj_t * pAnd0, * pAnd1;
+    int i;
+    // check for constant function
+    if ( Kit_GraphIsConst(pGraph) )
+        return Hop_NotCond( Hop_ManConst1(pMan), Kit_GraphIsComplement(pGraph) );
+    // check for a literal
+    if ( Kit_GraphIsVar(pGraph) )
+        return Hop_NotCond( Kit_GraphVar(pGraph)->pFunc, Kit_GraphIsComplement(pGraph) );
+    // build the AIG nodes corresponding to the AND gates of the graph
+    Kit_GraphForEachNode( pGraph, pNode, i )
+    {
+        pAnd0 = Hop_NotCond( Kit_GraphNode(pGraph, pNode->eEdge0.Node)->pFunc, pNode->eEdge0.fCompl ); 
+        pAnd1 = Hop_NotCond( Kit_GraphNode(pGraph, pNode->eEdge1.Node)->pFunc, pNode->eEdge1.fCompl ); 
+        pNode->pFunc = Hop_And( pMan, pAnd0, pAnd1 );
+    }
+    // complement the result if necessary
+    return Hop_NotCond( pNode->pFunc, Kit_GraphIsComplement(pGraph) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Strashes one logic node using its SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Kit_GraphToHop( Hop_Man_t * pMan, Kit_Graph_t * pGraph )
+{
+    Kit_Node_t * pNode = NULL;
+    int i;
+    // collect the fanins
+    Kit_GraphForEachLeaf( pGraph, pNode, i )
+        pNode->pFunc = Hop_IthVar( pMan, i );
+    // perform strashing
+    return Kit_GraphToHopInternal( pMan, pGraph );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Strashed onen logic nodes using its truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Kit_TruthToHop( Hop_Man_t * pMan, unsigned * pTruth, int nVars, Vec_Int_t * vMemory )
+{
+    Hop_Obj_t * pObj;
+    Kit_Graph_t * pGraph;
+    // transform truth table into the decomposition tree
+    if ( vMemory == NULL )
+    {
+        vMemory = Vec_IntAlloc( 0 );
+        pGraph = Kit_TruthToGraph( pTruth, nVars, vMemory );
+        Vec_IntFree( vMemory );
+    }
+    else
+        pGraph = Kit_TruthToGraph( pTruth, nVars, vMemory );
+    // derive the AIG for the decomposition tree
+    pObj = Kit_GraphToHop( pMan, pGraph );
+    Kit_GraphFree( pGraph );
+    return pObj;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Strashes one logic node using its SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Hop_Obj_t * Kit_CoverToHop( Hop_Man_t * pMan, Vec_Int_t * vCover, int nVars, Vec_Int_t * vMemory )
+{
+    Kit_Graph_t * pGraph;
+    Hop_Obj_t * pFunc;
+    // perform factoring
+    pGraph = Kit_SopFactor( vCover, 0, nVars, vMemory );
+    // convert graph to the AIG
+    pFunc = Kit_GraphToHop( pMan, pGraph );
+    Kit_GraphFree( pGraph );
+    return pFunc;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitIsop.c b/abc70930/src/aig/kit/kitIsop.c
new file mode 100644
index 00000000..42fae2ea
--- /dev/null
+++ b/abc70930/src/aig/kit/kitIsop.c
@@ -0,0 +1,325 @@
+/**CFile****************************************************************
+
+  FileName    [kitIsop.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [ISOP computation based on Morreale's algorithm.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitIsop.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// ISOP computation fails if intermediate memory usage exceed this limit
+#define KIT_ISOP_MEM_LIMIT  (1<<16)
+
+// static procedures to compute ISOP
+static unsigned * Kit_TruthIsop_rec( unsigned * puOn, unsigned * puOnDc, int nVars, Kit_Sop_t * pcRes, Vec_Int_t * vStore );
+static unsigned   Kit_TruthIsop5_rec( unsigned uOn, unsigned uOnDc, int nVars, Kit_Sop_t * pcRes, Vec_Int_t * vStore );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes ISOP from TT.]
+
+  Description [Returns the cover in vMemory. Uses the rest of array in vMemory
+  as an intermediate memory storage. Returns the cover with -1 cubes, if the
+  the computation exceeded the memory limit (KIT_ISOP_MEM_LIMIT words of
+  intermediate data).]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthIsop( unsigned * puTruth, int nVars, Vec_Int_t * vMemory, int fTryBoth )
+{
+    Kit_Sop_t cRes, * pcRes = &cRes;
+    Kit_Sop_t cRes2, * pcRes2 = &cRes2;
+    unsigned * pResult;
+    int RetValue = 0;
+    assert( nVars >= 0 && nVars < 16 );
+    // if nVars < 5, make sure it does not depend on those vars
+//    for ( i = nVars; i < 5; i++ )
+//        assert( !Kit_TruthVarInSupport(puTruth, 5, i) );
+    // prepare memory manager
+    Vec_IntClear( vMemory );
+    Vec_IntGrow( vMemory, KIT_ISOP_MEM_LIMIT );
+    // compute ISOP for the direct polarity
+    pResult = Kit_TruthIsop_rec( puTruth, puTruth, nVars, pcRes, vMemory );
+    if ( pcRes->nCubes == -1 )
+    {
+        vMemory->nSize = -1;
+        return -1;
+    }
+    assert( Kit_TruthIsEqual( puTruth, pResult, nVars ) );
+    if ( pcRes->nCubes == 0 || (pcRes->nCubes == 1 && pcRes->pCubes[0] == 0) )
+    {
+        vMemory->pArray[0] = 0;
+        Vec_IntShrink( vMemory, pcRes->nCubes );
+        return 0;
+    }
+    if ( fTryBoth )
+    {
+        // compute ISOP for the complemented polarity
+        Kit_TruthNot( puTruth, puTruth, nVars );
+        pResult = Kit_TruthIsop_rec( puTruth, puTruth, nVars, pcRes2, vMemory );
+        if ( pcRes2->nCubes >= 0 )
+        {
+            assert( Kit_TruthIsEqual( puTruth, pResult, nVars ) );
+            if ( pcRes->nCubes > pcRes2->nCubes )
+            {
+                RetValue = 1;
+                pcRes = pcRes2;
+            }
+        }
+        Kit_TruthNot( puTruth, puTruth, nVars );
+    }
+//    printf( "%d ", vMemory->nSize );
+    // move the cover representation to the beginning of the memory buffer
+    memmove( vMemory->pArray, pcRes->pCubes, pcRes->nCubes * sizeof(unsigned) );
+    Vec_IntShrink( vMemory, pcRes->nCubes );
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes ISOP 6 variables or more.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned * Kit_TruthIsop_rec( unsigned * puOn, unsigned * puOnDc, int nVars, Kit_Sop_t * pcRes, Vec_Int_t * vStore )
+{
+    Kit_Sop_t cRes0, cRes1, cRes2;
+    Kit_Sop_t * pcRes0 = &cRes0, * pcRes1 = &cRes1, * pcRes2 = &cRes2;
+    unsigned * puRes0, * puRes1, * puRes2;
+    unsigned * puOn0, * puOn1, * puOnDc0, * puOnDc1, * pTemp, * pTemp0, * pTemp1;
+    int i, k, Var, nWords, nWordsAll;
+//    assert( Kit_TruthIsImply( puOn, puOnDc, nVars ) );
+    // allocate room for the resulting truth table
+    nWordsAll = Kit_TruthWordNum( nVars );
+    pTemp = Vec_IntFetch( vStore, nWordsAll );
+    if ( pTemp == NULL )
+    {
+        pcRes->nCubes = -1;
+        return NULL;
+    }
+    // check for constants
+    if ( Kit_TruthIsConst0( puOn, nVars ) )
+    {
+        pcRes->nCubes = 0;
+        pcRes->pCubes = NULL;
+        Kit_TruthClear( pTemp, nVars );
+        return pTemp;
+    }
+    if ( Kit_TruthIsConst1( puOnDc, nVars ) )
+    {
+        pcRes->nCubes = 1;
+        pcRes->pCubes = Vec_IntFetch( vStore, 1 );
+        if ( pcRes->pCubes == NULL )
+        {
+            pcRes->nCubes = -1;
+            return NULL;
+        }
+        pcRes->pCubes[0] = 0;
+        Kit_TruthFill( pTemp, nVars );
+        return pTemp;
+    }
+    assert( nVars > 0 );
+    // find the topmost var
+    for ( Var = nVars-1; Var >= 0; Var-- )
+        if ( Kit_TruthVarInSupport( puOn, nVars, Var ) || 
+             Kit_TruthVarInSupport( puOnDc, nVars, Var ) )
+             break;
+    assert( Var >= 0 );
+    // consider a simple case when one-word computation can be used
+    if ( Var < 5 )
+    {
+        unsigned uRes = Kit_TruthIsop5_rec( puOn[0], puOnDc[0], Var+1, pcRes, vStore );
+        for ( i = 0; i < nWordsAll; i++ )
+            pTemp[i] = uRes;
+        return pTemp;
+    }
+    assert( Var >= 5 );
+    nWords = Kit_TruthWordNum( Var );
+    // cofactor
+    puOn0   = puOn;    puOn1   = puOn + nWords;
+    puOnDc0 = puOnDc;  puOnDc1 = puOnDc + nWords;
+    pTemp0  = pTemp;   pTemp1  = pTemp + nWords;
+    // solve for cofactors
+    Kit_TruthSharp( pTemp0, puOn0, puOnDc1, Var );
+    puRes0 = Kit_TruthIsop_rec( pTemp0, puOnDc0, Var, pcRes0, vStore );
+    if ( pcRes0->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return NULL;
+    }
+    Kit_TruthSharp( pTemp1, puOn1, puOnDc0, Var );
+    puRes1 = Kit_TruthIsop_rec( pTemp1, puOnDc1, Var, pcRes1, vStore );
+    if ( pcRes1->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return NULL;
+    }
+    Kit_TruthSharp( pTemp0, puOn0, puRes0, Var );
+    Kit_TruthSharp( pTemp1, puOn1, puRes1, Var );
+    Kit_TruthOr( pTemp0, pTemp0, pTemp1, Var );
+    Kit_TruthAnd( pTemp1, puOnDc0, puOnDc1, Var );
+    puRes2 = Kit_TruthIsop_rec( pTemp0, pTemp1, Var, pcRes2, vStore );
+    if ( pcRes2->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return NULL;
+    }
+    // create the resulting cover
+    pcRes->nCubes = pcRes0->nCubes + pcRes1->nCubes + pcRes2->nCubes;
+    pcRes->pCubes = Vec_IntFetch( vStore, pcRes->nCubes );
+    if ( pcRes->pCubes == NULL )
+    {
+        pcRes->nCubes = -1;
+        return NULL;
+    }
+    k = 0;
+    for ( i = 0; i < pcRes0->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes0->pCubes[i] | (1 << ((Var<<1)+0));
+    for ( i = 0; i < pcRes1->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes1->pCubes[i] | (1 << ((Var<<1)+1));
+    for ( i = 0; i < pcRes2->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes2->pCubes[i];
+    assert( k == pcRes->nCubes );
+    // create the resulting truth table
+    Kit_TruthOr( pTemp0, puRes0, puRes2, Var );
+    Kit_TruthOr( pTemp1, puRes1, puRes2, Var );
+    // copy the table if needed
+    nWords <<= 1;
+    for ( i = 1; i < nWordsAll/nWords; i++ )
+        for ( k = 0; k < nWords; k++ )
+            pTemp[i*nWords + k] = pTemp[k];
+    // verify in the end
+//    assert( Kit_TruthIsImply( puOn, pTemp, nVars ) );
+//    assert( Kit_TruthIsImply( pTemp, puOnDc, nVars ) );
+    return pTemp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes ISOP for 5 variables or less.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_TruthIsop5_rec( unsigned uOn, unsigned uOnDc, int nVars, Kit_Sop_t * pcRes, Vec_Int_t * vStore )
+{
+    unsigned uMasks[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 };
+    Kit_Sop_t cRes0, cRes1, cRes2;
+    Kit_Sop_t * pcRes0 = &cRes0, * pcRes1 = &cRes1, * pcRes2 = &cRes2;
+    unsigned uOn0, uOn1, uOnDc0, uOnDc1, uRes0, uRes1, uRes2;
+    int i, k, Var;
+    assert( nVars <= 5 );
+    assert( (uOn & ~uOnDc) == 0 );
+    if ( uOn == 0 )
+    {
+        pcRes->nCubes = 0;
+        pcRes->pCubes = NULL;
+        return 0;
+    }
+    if ( uOnDc == 0xFFFFFFFF )
+    {
+        pcRes->nCubes = 1;
+        pcRes->pCubes = Vec_IntFetch( vStore, 1 );
+        if ( pcRes->pCubes == NULL )
+        {
+            pcRes->nCubes = -1;
+            return 0;
+        }
+        pcRes->pCubes[0] = 0;
+        return 0xFFFFFFFF;
+    }
+    assert( nVars > 0 );
+    // find the topmost var
+    for ( Var = nVars-1; Var >= 0; Var-- )
+        if ( Kit_TruthVarInSupport( &uOn, 5, Var ) || 
+             Kit_TruthVarInSupport( &uOnDc, 5, Var ) )
+             break;
+    assert( Var >= 0 );
+    // cofactor
+    uOn0   = uOn1   = uOn;
+    uOnDc0 = uOnDc1 = uOnDc;
+    Kit_TruthCofactor0( &uOn0, Var + 1, Var );
+    Kit_TruthCofactor1( &uOn1, Var + 1, Var );
+    Kit_TruthCofactor0( &uOnDc0, Var + 1, Var );
+    Kit_TruthCofactor1( &uOnDc1, Var + 1, Var );
+    // solve for cofactors
+    uRes0 = Kit_TruthIsop5_rec( uOn0 & ~uOnDc1, uOnDc0, Var, pcRes0, vStore );
+    if ( pcRes0->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return 0;
+    }
+    uRes1 = Kit_TruthIsop5_rec( uOn1 & ~uOnDc0, uOnDc1, Var, pcRes1, vStore );
+    if ( pcRes1->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return 0;
+    }
+    uRes2 = Kit_TruthIsop5_rec( (uOn0 & ~uRes0) | (uOn1 & ~uRes1), uOnDc0 & uOnDc1, Var, pcRes2, vStore );
+    if ( pcRes2->nCubes == -1 )
+    {
+        pcRes->nCubes = -1;
+        return 0;
+    }
+    // create the resulting cover
+    pcRes->nCubes = pcRes0->nCubes + pcRes1->nCubes + pcRes2->nCubes;
+    pcRes->pCubes = Vec_IntFetch( vStore, pcRes->nCubes );
+    if ( pcRes->pCubes == NULL )
+    {
+        pcRes->nCubes = -1;
+        return 0;
+    }
+    k = 0;
+    for ( i = 0; i < pcRes0->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes0->pCubes[i] | (1 << ((Var<<1)+0));
+    for ( i = 0; i < pcRes1->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes1->pCubes[i] | (1 << ((Var<<1)+1));
+    for ( i = 0; i < pcRes2->nCubes; i++ )
+        pcRes->pCubes[k++] = pcRes2->pCubes[i];
+    assert( k == pcRes->nCubes );
+    // derive the final truth table
+    uRes2 |= (uRes0 & ~uMasks[Var]) | (uRes1 & uMasks[Var]);
+//    assert( (uOn & ~uRes2) == 0 );
+//    assert( (uRes2 & ~uOnDc) == 0 );
+    return uRes2;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitSop.c b/abc70930/src/aig/kit/kitSop.c
new file mode 100644
index 00000000..20ad0651
--- /dev/null
+++ b/abc70930/src/aig/kit/kitSop.c
@@ -0,0 +1,572 @@
+/**CFile****************************************************************
+
+  FileName    [kitSop.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures involving SOPs.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitSop.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Creates SOP from the cube array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopCreate( Kit_Sop_t * cResult, Vec_Int_t * vInput, int nVars, Vec_Int_t * vMemory )
+{
+    unsigned uCube;
+    int i;
+    // start the cover
+    cResult->nCubes = 0;
+    cResult->pCubes = Vec_IntFetch( vMemory, Vec_IntSize(vInput) );
+    // add the cubes
+    Vec_IntForEachEntry( vInput, uCube, i )
+        Kit_SopPushCube( cResult, uCube );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates SOP from the cube array.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopCreateInverse( Kit_Sop_t * cResult, Vec_Int_t * vInput, int nLits, Vec_Int_t * vMemory )
+{
+    unsigned uCube, uMask = 0;
+    int i, nCubes = Vec_IntSize(vInput);
+    // start the cover
+    cResult->nCubes = 0;
+    cResult->pCubes = Vec_IntFetch( vMemory, nCubes );
+    // add the cubes
+//    Vec_IntForEachEntry( vInput, uCube, i )
+    for ( i = 0; i < nCubes; i++ )
+    {
+        uCube = Vec_IntEntry( vInput, i );
+        uMask = ((uCube | (uCube >> 1)) & 0x55555555);
+        uMask |= (uMask << 1);
+        Kit_SopPushCube( cResult, uCube ^ uMask );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Duplicates SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopDup( Kit_Sop_t * cResult, Kit_Sop_t * cSop, Vec_Int_t * vMemory )
+{
+    unsigned uCube;
+    int i;
+    // start the cover
+    cResult->nCubes = 0;
+    cResult->pCubes = Vec_IntFetch( vMemory, Kit_SopCubeNum(cSop) );
+    // add the cubes
+    Kit_SopForEachCube( cSop, uCube, i )
+        Kit_SopPushCube( cResult, uCube );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives the quotient of division by literal.]
+
+  Description [Reduces the cover to be equal to the result of
+  division of the given cover by the literal.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopDivideByLiteralQuo( Kit_Sop_t * cSop, int iLit )
+{
+    unsigned uCube;
+    int i, k = 0;
+    Kit_SopForEachCube( cSop, uCube, i )
+    {
+        if ( Kit_CubeHasLit(uCube, iLit) )
+            Kit_SopWriteCube( cSop, Kit_CubeRemLit(uCube, iLit), k++ );
+    }
+    Kit_SopShrink( cSop, k );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Divides cover by one cube.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopDivideByCube( Kit_Sop_t * cSop, Kit_Sop_t * cDiv, Kit_Sop_t * vQuo, Kit_Sop_t * vRem, Vec_Int_t * vMemory )
+{
+    unsigned uCube, uDiv;
+    int i;
+    // get the only cube
+    assert( Kit_SopCubeNum(cDiv) == 1 );
+    uDiv = Kit_SopCube(cDiv, 0);
+    // allocate covers
+    vQuo->nCubes = 0;
+    vQuo->pCubes = Vec_IntFetch( vMemory, Kit_SopCubeNum(cSop) );
+    vRem->nCubes = 0;
+    vRem->pCubes = Vec_IntFetch( vMemory, Kit_SopCubeNum(cSop) );
+    // sort the cubes
+    Kit_SopForEachCube( cSop, uCube, i )
+    {
+        if ( Kit_CubeContains( uCube, uDiv ) )
+            Kit_SopPushCube( vQuo, Kit_CubeSharp(uCube, uDiv) );
+        else
+            Kit_SopPushCube( vRem, uCube );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Divides cover by one cube.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopDivideInternal( Kit_Sop_t * cSop, Kit_Sop_t * cDiv, Kit_Sop_t * vQuo, Kit_Sop_t * vRem, Vec_Int_t * vMemory )
+{
+    unsigned uCube, uDiv, uCube2, uDiv2, uQuo;
+    int i, i2, k, k2, nCubesRem;
+    assert( Kit_SopCubeNum(cSop) >= Kit_SopCubeNum(cDiv) );
+    // consider special case
+    if ( Kit_SopCubeNum(cDiv) == 1 )
+    {
+        Kit_SopDivideByCube( cSop, cDiv, vQuo, vRem, vMemory );
+        return;
+    }
+    // allocate quotient
+    vQuo->nCubes = 0;
+    vQuo->pCubes = Vec_IntFetch( vMemory, Kit_SopCubeNum(cSop) / Kit_SopCubeNum(cDiv) );
+    // for each cube of the cover
+    // it either belongs to the quotient or to the remainder
+    Kit_SopForEachCube( cSop, uCube, i )
+    {
+        // skip taken cubes
+        if ( Kit_CubeIsMarked(uCube) )
+            continue;
+        // find a matching cube in the divisor
+        uDiv = ~0;
+        Kit_SopForEachCube( cDiv, uDiv, k )
+            if ( Kit_CubeContains( uCube, uDiv ) )
+                break;
+        // the cube is not found 
+        if ( k == Kit_SopCubeNum(cDiv) )
+            continue;
+        // the quotient cube exists
+        uQuo = Kit_CubeSharp( uCube, uDiv );
+        // find corresponding cubes for other cubes of the divisor
+        uDiv2 = ~0;
+        Kit_SopForEachCube( cDiv, uDiv2, k2 )
+        {
+            if ( k2 == k )
+                continue;
+            // find a matching cube
+            Kit_SopForEachCube( cSop, uCube2, i2 )
+            {
+                // skip taken cubes
+                if ( Kit_CubeIsMarked(uCube2) )
+                    continue;
+                // check if the cube can be used
+                if ( Kit_CubeContains( uCube2, uDiv2 ) && uQuo == Kit_CubeSharp( uCube2, uDiv2 ) )
+                    break;
+            }
+            // the case when the cube is not found
+            if ( i2 == Kit_SopCubeNum(cSop) )
+                break;
+        }
+        // we did not find some cubes - continue looking at other cubes
+        if ( k2 != Kit_SopCubeNum(cDiv) )
+            continue;
+        // we found all cubes - add the quotient cube
+        Kit_SopPushCube( vQuo, uQuo );
+
+        // mark the first cube
+        Kit_SopWriteCube( cSop, Kit_CubeMark(uCube), i );
+        // mark other cubes that have this quotient
+        Kit_SopForEachCube( cDiv, uDiv2, k2 )
+        {
+            if ( k2 == k )
+                continue;
+            // find a matching cube
+            Kit_SopForEachCube( cSop, uCube2, i2 )
+            {
+                // skip taken cubes
+                if ( Kit_CubeIsMarked(uCube2) )
+                    continue;
+                // check if the cube can be used
+                if ( Kit_CubeContains( uCube2, uDiv2 ) && uQuo == Kit_CubeSharp( uCube2, uDiv2 ) )
+                    break;
+            }
+            assert( i2 < Kit_SopCubeNum(cSop) );
+            // the cube is found, mark it 
+            // (later we will add all unmarked cubes to the remainder)
+            Kit_SopWriteCube( cSop, Kit_CubeMark(uCube2), i2 );
+        }
+    }
+    // determine the number of cubes in the remainder
+    nCubesRem = Kit_SopCubeNum(cSop) - Kit_SopCubeNum(vQuo) * Kit_SopCubeNum(cDiv);
+    // allocate remainder
+    vRem->nCubes = 0;
+    vRem->pCubes = Vec_IntFetch( vMemory, nCubesRem );
+    // finally add the remaining unmarked cubes to the remainder 
+    // and clean the marked cubes in the cover
+    Kit_SopForEachCube( cSop, uCube, i )
+    {
+        if ( !Kit_CubeIsMarked(uCube) )
+        {
+            Kit_SopPushCube( vRem, uCube );
+            continue;
+        }
+        Kit_SopWriteCube( cSop, Kit_CubeUnmark(uCube), i );
+    }
+    assert( nCubesRem == Kit_SopCubeNum(vRem) );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the common cube.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline unsigned Kit_SopCommonCube( Kit_Sop_t * cSop )
+{
+    unsigned uMask, uCube;
+    int i;
+    uMask = ~(unsigned)0;
+    Kit_SopForEachCube( cSop, uCube, i )
+        uMask &= uCube;
+    return uMask;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Makes the cover cube-free.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopMakeCubeFree( Kit_Sop_t * cSop )
+{
+    unsigned uMask, uCube;
+    int i;
+    uMask = Kit_SopCommonCube( cSop );
+    if ( uMask == 0 )
+        return;
+    // remove the common cube
+    Kit_SopForEachCube( cSop, uCube, i )
+        Kit_SopWriteCube( cSop, Kit_CubeSharp(uCube, uMask), i );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks if the cover is cube-free.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopIsCubeFree( Kit_Sop_t * cSop )
+{
+    return Kit_SopCommonCube( cSop ) == 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates SOP composes of the common cube of the given SOP.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopCommonCubeCover( Kit_Sop_t * cResult, Kit_Sop_t * cSop, Vec_Int_t * vMemory )
+{
+    assert( Kit_SopCubeNum(cSop) > 0 );
+    cResult->nCubes = 0;
+    cResult->pCubes = Vec_IntFetch( vMemory, 1 );
+    Kit_SopPushCube( cResult, Kit_SopCommonCube(cSop) );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Find any literal that occurs more than once.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopAnyLiteral( Kit_Sop_t * cSop, int nLits )
+{
+    unsigned uCube;
+    int i, k, nLitsCur;
+    // go through each literal
+    for ( i = 0; i < nLits; i++ )
+    {
+        // go through all the cubes
+        nLitsCur = 0;
+        Kit_SopForEachCube( cSop, uCube, k )
+            if ( Kit_CubeHasLit(uCube, i) )
+                nLitsCur++;
+        if ( nLitsCur > 1 )
+            return i;
+    }
+    return -1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find the least often occurring literal.]
+
+  Description [Find the least often occurring literal among those
+  that occur more than once.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopWorstLiteral( Kit_Sop_t * cSop, int nLits )
+{
+    unsigned uCube;
+    int i, k, iMin, nLitsMin, nLitsCur;
+    int fUseFirst = 1;
+
+    // go through each literal
+    iMin = -1;
+    nLitsMin = 1000000;
+    for ( i = 0; i < nLits; i++ )
+    {
+        // go through all the cubes
+        nLitsCur = 0;
+        Kit_SopForEachCube( cSop, uCube, k )
+            if ( Kit_CubeHasLit(uCube, i) )
+                nLitsCur++;
+        // skip the literal that does not occur or occurs once
+        if ( nLitsCur < 2 )
+            continue;
+        // check if this is the best literal
+        if ( fUseFirst )
+        {
+            if ( nLitsMin > nLitsCur )
+            {
+                nLitsMin = nLitsCur;
+                iMin = i;
+            }
+        }
+        else
+        {
+            if ( nLitsMin >= nLitsCur )
+            {
+                nLitsMin = nLitsCur;
+                iMin = i;
+            }
+        }
+    }
+    if ( nLitsMin < 1000000 )
+        return iMin;
+    return -1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Find the least often occurring literal.]
+
+  Description [Find the least often occurring literal among those
+  that occur more than once.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopBestLiteral( Kit_Sop_t * cSop, int nLits, unsigned uMask )
+{
+    unsigned uCube;
+    int i, k, iMax, nLitsMax, nLitsCur;
+    int fUseFirst = 1;
+
+    // go through each literal
+    iMax = -1;
+    nLitsMax = -1;
+    for ( i = 0; i < nLits; i++ )
+    {
+        if ( !Kit_CubeHasLit(uMask, i) )
+            continue;
+        // go through all the cubes
+        nLitsCur = 0;
+        Kit_SopForEachCube( cSop, uCube, k )
+            if ( Kit_CubeHasLit(uCube, i) )
+                nLitsCur++;
+        // skip the literal that does not occur or occurs once
+        if ( nLitsCur < 2 )
+            continue;
+        // check if this is the best literal
+        if ( fUseFirst )
+        {
+            if ( nLitsMax < nLitsCur )
+            {
+                nLitsMax = nLitsCur;
+                iMax = i;
+            }
+        }
+        else
+        {
+            if ( nLitsMax <= nLitsCur )
+            {
+                nLitsMax = nLitsCur;
+                iMax = i;
+            }
+        }
+    }
+    if ( nLitsMax >= 0 )
+        return iMax;
+    return -1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes a level-zero kernel.]
+
+  Description [Modifies the cover to contain one level-zero kernel.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopDivisorZeroKernel_rec( Kit_Sop_t * cSop, int nLits )
+{
+    int iLit;
+    // find any literal that occurs at least two times
+    iLit = Kit_SopWorstLiteral( cSop, nLits );
+    if ( iLit == -1 )
+        return;
+    // derive the cube-free quotient
+    Kit_SopDivideByLiteralQuo( cSop, iLit ); // the same cover
+    Kit_SopMakeCubeFree( cSop );             // the same cover
+    // call recursively
+    Kit_SopDivisorZeroKernel_rec( cSop, nLits );    // the same cover
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes the quick divisor of the cover.]
+
+  Description [Returns 0, if there is no divisor other than trivial.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_SopDivisor( Kit_Sop_t * cResult, Kit_Sop_t * cSop, int nLits, Vec_Int_t * vMemory )
+{
+    if ( Kit_SopCubeNum(cSop) <= 1 )
+        return 0;
+    if ( Kit_SopAnyLiteral( cSop, nLits ) == -1 )
+        return 0;
+    // duplicate the cover
+    Kit_SopDup( cResult, cSop, vMemory );
+    // perform the kerneling
+    Kit_SopDivisorZeroKernel_rec( cResult, nLits );
+    assert( Kit_SopCubeNum(cResult) > 0 );
+    return 1;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Create the one-literal cover with the best literal from cSop.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_SopBestLiteralCover( Kit_Sop_t * cResult, Kit_Sop_t * cSop, unsigned uCube, int nLits, Vec_Int_t * vMemory )
+{
+    int iLitBest;
+    // get the best literal
+    iLitBest = Kit_SopBestLiteral( cSop, nLits, uCube );
+    // start the cover
+    cResult->nCubes = 0;
+    cResult->pCubes = Vec_IntFetch( vMemory, 1 );
+    // set the cube
+    Kit_SopPushCube( cResult, Kit_CubeSetLit(0, iLitBest) );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kitTruth.c b/abc70930/src/aig/kit/kitTruth.c
new file mode 100644
index 00000000..dab60132
--- /dev/null
+++ b/abc70930/src/aig/kit/kitTruth.c
@@ -0,0 +1,1721 @@
+/**CFile****************************************************************
+
+  FileName    [kitTruth.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    [Procedures involving truth tables.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kitTruth.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Swaps two adjacent variables in the truth table.]
+
+  Description [Swaps var number Start and var number Start+1 (0-based numbers).
+  The input truth table is pIn. The output truth table is pOut.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthSwapAdjacentVars( unsigned * pOut, unsigned * pIn, int nVars, int iVar )
+{
+    static unsigned PMasks[4][3] = {
+        { 0x99999999, 0x22222222, 0x44444444 },
+        { 0xC3C3C3C3, 0x0C0C0C0C, 0x30303030 },
+        { 0xF00FF00F, 0x00F000F0, 0x0F000F00 },
+        { 0xFF0000FF, 0x0000FF00, 0x00FF0000 }
+    };
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step, Shift;
+
+    assert( iVar < nVars - 1 );
+    if ( iVar < 4 )
+    {
+        Shift = (1 << iVar);
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & PMasks[iVar][0]) | ((pIn[i] & PMasks[iVar][1]) << Shift) | ((pIn[i] & PMasks[iVar][2]) >> Shift);
+    }
+    else if ( iVar > 4 )
+    {
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 4*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pOut[i] = pIn[i];
+            for ( i = 0; i < Step; i++ )
+                pOut[Step+i] = pIn[2*Step+i];
+            for ( i = 0; i < Step; i++ )
+                pOut[2*Step+i] = pIn[Step+i];
+            for ( i = 0; i < Step; i++ )
+                pOut[3*Step+i] = pIn[3*Step+i];
+            pIn  += 4*Step;
+            pOut += 4*Step;
+        }
+    }
+    else // if ( iVar == 4 )
+    {
+        for ( i = 0; i < nWords; i += 2 )
+        {
+            pOut[i]   = (pIn[i]   & 0x0000FFFF) | ((pIn[i+1] & 0x0000FFFF) << 16);
+            pOut[i+1] = (pIn[i+1] & 0xFFFF0000) | ((pIn[i]   & 0xFFFF0000) >> 16);
+        }
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Swaps two adjacent variables in the truth table.]
+
+  Description [Swaps var number Start and var number Start+1 (0-based numbers).
+  The input truth table is pIn. The output truth table is pOut.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthSwapAdjacentVars2( unsigned * pIn, unsigned * pOut, int nVars, int Start )
+{
+    int nWords = (nVars <= 5)? 1 : (1 << (nVars-5));
+    int i, k, Step;
+
+    assert( Start < nVars - 1 );
+    switch ( Start )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x99999999) | ((pIn[i] & 0x22222222) << 1) | ((pIn[i] & 0x44444444) >> 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xC3C3C3C3) | ((pIn[i] & 0x0C0C0C0C) << 2) | ((pIn[i] & 0x30303030) >> 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xF00FF00F) | ((pIn[i] & 0x00F000F0) << 4) | ((pIn[i] & 0x0F000F00) >> 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xFF0000FF) | ((pIn[i] & 0x0000FF00) << 8) | ((pIn[i] & 0x00FF0000) >> 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i += 2 )
+        {
+            pOut[i]   = (pIn[i]   & 0x0000FFFF) | ((pIn[i+1] & 0x0000FFFF) << 16);
+            pOut[i+1] = (pIn[i+1] & 0xFFFF0000) | ((pIn[i]   & 0xFFFF0000) >> 16);
+        }
+        return;
+    default:
+        Step = (1 << (Start - 5));
+        for ( k = 0; k < nWords; k += 4*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pOut[i] = pIn[i];
+            for ( i = 0; i < Step; i++ )
+                pOut[Step+i] = pIn[2*Step+i];
+            for ( i = 0; i < Step; i++ )
+                pOut[2*Step+i] = pIn[Step+i];
+            for ( i = 0; i < Step; i++ )
+                pOut[3*Step+i] = pIn[3*Step+i];
+            pIn  += 4*Step;
+            pOut += 4*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Expands the truth table according to the phase.]
+
+  Description [The input and output truth tables are in pIn/pOut. The current number
+  of variables is nVars. The total number of variables in nVarsAll. The last argument
+  (Phase) contains shows where the variables should go.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthStretch( unsigned * pOut, unsigned * pIn, int nVars, int nVarsAll, unsigned Phase, int fReturnIn )
+{
+    unsigned * pTemp;
+    int i, k, Var = nVars - 1, Counter = 0;
+    for ( i = nVarsAll - 1; i >= 0; i-- )
+        if ( Phase & (1 << i) )
+        {
+            for ( k = Var; k < i; k++ )
+            {
+                Kit_TruthSwapAdjacentVars( pOut, pIn, nVarsAll, k );
+                pTemp = pIn; pIn = pOut; pOut = pTemp;
+                Counter++;
+            }
+            Var--;
+        }
+    assert( Var == -1 );
+    // swap if it was moved an even number of times
+    if ( fReturnIn ^ !(Counter & 1) )
+        Kit_TruthCopy( pOut, pIn, nVarsAll );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Shrinks the truth table according to the phase.]
+
+  Description [The input and output truth tables are in pIn/pOut. The current number
+  of variables is nVars. The total number of variables in nVarsAll. The last argument
+  (Phase) contains shows what variables should remain.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthShrink( unsigned * pOut, unsigned * pIn, int nVars, int nVarsAll, unsigned Phase, int fReturnIn )
+{
+    unsigned * pTemp;
+    int i, k, Var = 0, Counter = 0;
+    for ( i = 0; i < nVarsAll; i++ )
+        if ( Phase & (1 << i) )
+        {
+            for ( k = i-1; k >= Var; k-- )
+            {
+                Kit_TruthSwapAdjacentVars( pOut, pIn, nVarsAll, k );
+                pTemp = pIn; pIn = pOut; pOut = pTemp;
+                Counter++;
+            }
+            Var++;
+        }
+    assert( Var == nVars );
+    // swap if it was moved an even number of times
+    if ( fReturnIn ^ !(Counter & 1) )
+        Kit_TruthCopy( pOut, pIn, nVarsAll );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Returns 1 if TT depends on the given variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthVarInSupport( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            if ( (pTruth[i] & 0x55555555) != ((pTruth[i] & 0xAAAAAAAA) >> 1) )
+                return 1;
+        return 0;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            if ( (pTruth[i] & 0x33333333) != ((pTruth[i] & 0xCCCCCCCC) >> 2) )
+                return 1;
+        return 0;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            if ( (pTruth[i] & 0x0F0F0F0F) != ((pTruth[i] & 0xF0F0F0F0) >> 4) )
+                return 1;
+        return 0;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            if ( (pTruth[i] & 0x00FF00FF) != ((pTruth[i] & 0xFF00FF00) >> 8) )
+                return 1;
+        return 0;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            if ( (pTruth[i] & 0x0000FFFF) != ((pTruth[i] & 0xFFFF0000) >> 16) )
+                return 1;
+        return 0;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                if ( pTruth[i] != pTruth[Step+i] )
+                    return 1;
+            pTruth += 2*Step;
+        }
+        return 0;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the number of support vars.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthSupportSize( unsigned * pTruth, int nVars )
+{
+    int i, Counter = 0;
+    for ( i = 0; i < nVars; i++ )
+        Counter += Kit_TruthVarInSupport( pTruth, nVars, i );
+    return Counter;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns support of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_TruthSupport( unsigned * pTruth, int nVars )
+{
+    int i, Support = 0;
+    for ( i = 0; i < nVars; i++ )
+        if ( Kit_TruthVarInSupport( pTruth, nVars, i ) )
+            Support |= (1 << i);
+    return Support;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Computes negative cofactor of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCofactor0( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0x55555555) | ((pTruth[i] & 0x55555555) << 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0x33333333) | ((pTruth[i] & 0x33333333) << 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0x0F0F0F0F) | ((pTruth[i] & 0x0F0F0F0F) << 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0x00FF00FF) | ((pTruth[i] & 0x00FF00FF) << 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0x0000FFFF) | ((pTruth[i] & 0x0000FFFF) << 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pTruth[Step+i] = pTruth[i];
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes positive cofactor of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCofactor1( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0xAAAAAAAA) | ((pTruth[i] & 0xAAAAAAAA) >> 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0xCCCCCCCC) | ((pTruth[i] & 0xCCCCCCCC) >> 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0xF0F0F0F0) | ((pTruth[i] & 0xF0F0F0F0) >> 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0xFF00FF00) | ((pTruth[i] & 0xFF00FF00) >> 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = (pTruth[i] & 0xFFFF0000) | ((pTruth[i] & 0xFFFF0000) >> 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pTruth[i] = pTruth[Step+i];
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes positive cofactor of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCofactor0New( unsigned * pOut, unsigned * pIn, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x55555555) | ((pIn[i] & 0x55555555) << 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x33333333) | ((pIn[i] & 0x33333333) << 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x0F0F0F0F) | ((pIn[i] & 0x0F0F0F0F) << 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x00FF00FF) | ((pIn[i] & 0x00FF00FF) << 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0x0000FFFF) | ((pIn[i] & 0x0000FFFF) << 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pOut[i] = pOut[Step+i] = pIn[i];
+            pIn += 2*Step;
+            pOut += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes positive cofactor of the function.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCofactor1New( unsigned * pOut, unsigned * pIn, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xAAAAAAAA) | ((pIn[i] & 0xAAAAAAAA) >> 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xCCCCCCCC) | ((pIn[i] & 0xCCCCCCCC) >> 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xF0F0F0F0) | ((pIn[i] & 0xF0F0F0F0) >> 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xFF00FF00) | ((pIn[i] & 0xFF00FF00) >> 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pIn[i] & 0xFFFF0000) | ((pIn[i] & 0xFFFF0000) >> 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+                pOut[i] = pOut[Step+i] = pIn[Step+i];
+            pIn += 2*Step;
+            pOut += 2*Step;
+        }
+        return;
+    }
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Existentially quantifies the variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthExist( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] |=  ((pTruth[i] & 0xAAAAAAAA) >> 1) | ((pTruth[i] & 0x55555555) << 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] |=  ((pTruth[i] & 0xCCCCCCCC) >> 2) | ((pTruth[i] & 0x33333333) << 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] |=  ((pTruth[i] & 0xF0F0F0F0) >> 4) | ((pTruth[i] & 0x0F0F0F0F) << 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] |=  ((pTruth[i] & 0xFF00FF00) >> 8) | ((pTruth[i] & 0x00FF00FF) << 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] |=  ((pTruth[i] & 0xFFFF0000) >> 16) | ((pTruth[i] & 0x0000FFFF) << 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pTruth[i]     |= pTruth[Step+i];
+                pTruth[Step+i] = pTruth[i];
+            }
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Existentially quantifies the variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthExistNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] | ((pTruth[i] & 0xAAAAAAAA) >> 1) | ((pTruth[i] & 0x55555555) << 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] | ((pTruth[i] & 0xCCCCCCCC) >> 2) | ((pTruth[i] & 0x33333333) << 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] | ((pTruth[i] & 0xF0F0F0F0) >> 4) | ((pTruth[i] & 0x0F0F0F0F) << 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] | ((pTruth[i] & 0xFF00FF00) >> 8) | ((pTruth[i] & 0x00FF00FF) << 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] | ((pTruth[i] & 0xFFFF0000) >> 16) | ((pTruth[i] & 0x0000FFFF) << 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pRes[i]      = pTruth[i] | pTruth[Step+i];
+                pRes[Step+i] = pRes[i];
+            }
+            pRes += 2*Step;
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Existantially quantifies the set of variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthExistSet( unsigned * pRes, unsigned * pTruth, int nVars, unsigned uMask )
+{
+    int v;
+    Kit_TruthCopy( pRes, pTruth, nVars );
+    for ( v = 0; v < nVars; v++ )
+        if ( uMask & (1 << v) )
+            Kit_TruthExist( pRes, nVars, v );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Unversally quantifies the variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthForall( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] &=  ((pTruth[i] & 0xAAAAAAAA) >> 1) | ((pTruth[i] & 0x55555555) << 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] &=  ((pTruth[i] & 0xCCCCCCCC) >> 2) | ((pTruth[i] & 0x33333333) << 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] &=  ((pTruth[i] & 0xF0F0F0F0) >> 4) | ((pTruth[i] & 0x0F0F0F0F) << 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] &=  ((pTruth[i] & 0xFF00FF00) >> 8) | ((pTruth[i] & 0x00FF00FF) << 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] &=  ((pTruth[i] & 0xFFFF0000) >> 16) | ((pTruth[i] & 0x0000FFFF) << 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pTruth[i]     &= pTruth[Step+i];
+                pTruth[Step+i] = pTruth[i];
+            }
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Universally quantifies the variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthForallNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] & (((pTruth[i] & 0xAAAAAAAA) >> 1) | ((pTruth[i] & 0x55555555) << 1));
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] & (((pTruth[i] & 0xCCCCCCCC) >> 2) | ((pTruth[i] & 0x33333333) << 2));
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] & (((pTruth[i] & 0xF0F0F0F0) >> 4) | ((pTruth[i] & 0x0F0F0F0F) << 4));
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] & (((pTruth[i] & 0xFF00FF00) >> 8) | ((pTruth[i] & 0x00FF00FF) << 8));
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] & (((pTruth[i] & 0xFFFF0000) >> 16) | ((pTruth[i] & 0x0000FFFF) << 16));
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pRes[i]      = pTruth[i] & pTruth[Step+i];
+                pRes[Step+i] = pRes[i];
+            }
+            pRes += 2*Step;
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Universally quantifies the variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthUniqueNew( unsigned * pRes, unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] ^ (((pTruth[i] & 0xAAAAAAAA) >> 1) | ((pTruth[i] & 0x55555555) << 1));
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] ^ (((pTruth[i] & 0xCCCCCCCC) >> 2) | ((pTruth[i] & 0x33333333) << 2));
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] ^ (((pTruth[i] & 0xF0F0F0F0) >> 4) | ((pTruth[i] & 0x0F0F0F0F) << 4));
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] ^ (((pTruth[i] & 0xFF00FF00) >> 8) | ((pTruth[i] & 0x00FF00FF) << 8));
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pRes[i] =  pTruth[i] ^ (((pTruth[i] & 0xFFFF0000) >> 16) | ((pTruth[i] & 0x0000FFFF) << 16));
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pRes[i]      = pTruth[i] ^ pTruth[Step+i];
+                pRes[Step+i] = pRes[i];
+            }
+            pRes += 2*Step;
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Universally quantifies the set of variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthForallSet( unsigned * pRes, unsigned * pTruth, int nVars, unsigned uMask )
+{
+    int v;
+    Kit_TruthCopy( pRes, pTruth, nVars );
+    for ( v = 0; v < nVars; v++ )
+        if ( uMask & (1 << v) )
+            Kit_TruthForall( pRes, nVars, v );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Multiplexes two functions with the given variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthMuxVar( unsigned * pOut, unsigned * pCof0, unsigned * pCof1, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pCof0[i] & 0x55555555) | (pCof1[i] & 0xAAAAAAAA);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pCof0[i] & 0x33333333) | (pCof1[i] & 0xCCCCCCCC);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pCof0[i] & 0x0F0F0F0F) | (pCof1[i] & 0xF0F0F0F0);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pCof0[i] & 0x00FF00FF) | (pCof1[i] & 0xFF00FF00);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (pCof0[i] & 0x0000FFFF) | (pCof1[i] & 0xFFFF0000);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pOut[i]      = pCof0[i];
+                pOut[Step+i] = pCof1[Step+i];
+            }
+            pOut += 2*Step;
+            pCof0 += 2*Step;
+            pCof1 += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Multiplexes two functions with the given variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthMuxVarPhase( unsigned * pOut, unsigned * pCof0, unsigned * pCof1, int nVars, int iVar, int fCompl0 )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+
+    if ( fCompl0 == 0 )
+    {
+        Kit_TruthMuxVar( pOut, pCof0, pCof1, nVars, iVar );
+        return;
+    }
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (~pCof0[i] & 0x55555555) | (pCof1[i] & 0xAAAAAAAA);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (~pCof0[i] & 0x33333333) | (pCof1[i] & 0xCCCCCCCC);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (~pCof0[i] & 0x0F0F0F0F) | (pCof1[i] & 0xF0F0F0F0);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (~pCof0[i] & 0x00FF00FF) | (pCof1[i] & 0xFF00FF00);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pOut[i] = (~pCof0[i] & 0x0000FFFF) | (pCof1[i] & 0xFFFF0000);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                pOut[i]      = ~pCof0[i];
+                pOut[Step+i] = pCof1[Step+i];
+            }
+            pOut += 2*Step;
+            pCof0 += 2*Step;
+            pCof1 += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks symmetry of two variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthVarsSymm( unsigned * pTruth, int nVars, int iVar0, int iVar1 )
+{
+    static unsigned uTemp0[16], uTemp1[16];
+    assert( nVars <= 9 );
+    // compute Cof01
+    Kit_TruthCopy( uTemp0, pTruth, nVars );
+    Kit_TruthCofactor0( uTemp0, nVars, iVar0 );
+    Kit_TruthCofactor1( uTemp0, nVars, iVar1 );
+    // compute Cof10
+    Kit_TruthCopy( uTemp1, pTruth, nVars );
+    Kit_TruthCofactor1( uTemp1, nVars, iVar0 );
+    Kit_TruthCofactor0( uTemp1, nVars, iVar1 );
+    // compare
+    return Kit_TruthIsEqual( uTemp0, uTemp1, nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Checks antisymmetry of two variables.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthVarsAntiSymm( unsigned * pTruth, int nVars, int iVar0, int iVar1 )
+{
+    static unsigned uTemp0[16], uTemp1[16];
+    assert( nVars <= 9 );
+    // compute Cof00
+    Kit_TruthCopy( uTemp0, pTruth, nVars );
+    Kit_TruthCofactor0( uTemp0, nVars, iVar0 );
+    Kit_TruthCofactor0( uTemp0, nVars, iVar1 );
+    // compute Cof11
+    Kit_TruthCopy( uTemp1, pTruth, nVars );
+    Kit_TruthCofactor1( uTemp1, nVars, iVar0 );
+    Kit_TruthCofactor1( uTemp1, nVars, iVar1 );
+    // compare
+    return Kit_TruthIsEqual( uTemp0, uTemp1, nVars );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Changes phase of the function w.r.t. one variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthChangePhase( unsigned * pTruth, int nVars, int iVar )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Step;
+    unsigned Temp;
+
+    assert( iVar < nVars );
+    switch ( iVar )
+    {
+    case 0:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ((pTruth[i] & 0x55555555) << 1) | ((pTruth[i] & 0xAAAAAAAA) >> 1);
+        return;
+    case 1:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ((pTruth[i] & 0x33333333) << 2) | ((pTruth[i] & 0xCCCCCCCC) >> 2);
+        return;
+    case 2:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ((pTruth[i] & 0x0F0F0F0F) << 4) | ((pTruth[i] & 0xF0F0F0F0) >> 4);
+        return;
+    case 3:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ((pTruth[i] & 0x00FF00FF) << 8) | ((pTruth[i] & 0xFF00FF00) >> 8);
+        return;
+    case 4:
+        for ( i = 0; i < nWords; i++ )
+            pTruth[i] = ((pTruth[i] & 0x0000FFFF) << 16) | ((pTruth[i] & 0xFFFF0000) >> 16);
+        return;
+    default:
+        Step = (1 << (iVar - 5));
+        for ( k = 0; k < nWords; k += 2*Step )
+        {
+            for ( i = 0; i < Step; i++ )
+            {
+                Temp = pTruth[i];
+                pTruth[i] = pTruth[Step+i];
+                pTruth[Step+i] = Temp;
+            }
+            pTruth += 2*Step;
+        }
+        return;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Computes minimum overlap in supports of cofactors.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthMinCofSuppOverlap( unsigned * pTruth, int nVars, int * pVarMin )
+{
+    static unsigned uCofactor[16];
+    int i, ValueCur, ValueMin, VarMin;
+    unsigned uSupp0, uSupp1;
+    int nVars0, nVars1;
+    assert( nVars <= 9 );
+    ValueMin = 32;
+    VarMin   = -1;
+    for ( i = 0; i < nVars; i++ )
+    {
+        // get negative cofactor
+        Kit_TruthCopy( uCofactor, pTruth, nVars );
+        Kit_TruthCofactor0( uCofactor, nVars, i );
+        uSupp0 = Kit_TruthSupport( uCofactor, nVars );
+        nVars0 = Kit_WordCountOnes( uSupp0 );
+//Kit_PrintBinary( stdout, &uSupp0, 8 ); printf( "\n" );
+        // get positive cofactor
+        Kit_TruthCopy( uCofactor, pTruth, nVars );
+        Kit_TruthCofactor1( uCofactor, nVars, i );
+        uSupp1 = Kit_TruthSupport( uCofactor, nVars );
+        nVars1 = Kit_WordCountOnes( uSupp1 );
+//Kit_PrintBinary( stdout, &uSupp1, 8 ); printf( "\n" );
+        // get the number of common vars
+        ValueCur = Kit_WordCountOnes( uSupp0 & uSupp1 );
+        if ( ValueMin > ValueCur && nVars0 <= 5 && nVars1 <= 5 )
+        {
+            ValueMin = ValueCur;
+            VarMin = i;
+        }
+        if ( ValueMin == 0 )
+            break;
+    }
+    if ( pVarMin )
+        *pVarMin = VarMin;
+    return ValueMin;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Find the best cofactoring variable.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthBestCofVar( unsigned * pTruth, int nVars, unsigned * pCof0, unsigned * pCof1 )
+{
+    int i, iBestVar, nSuppSizeCur0, nSuppSizeCur1, nSuppSizeCur, nSuppSizeMin;
+    if ( Kit_TruthIsConst0(pTruth, nVars) || Kit_TruthIsConst1(pTruth, nVars) )
+        return -1;
+    // iterate through variables
+    iBestVar = -1;
+    nSuppSizeMin = KIT_INFINITY;
+    for ( i = 0; i < nVars; i++ )
+    {
+        // cofactor the functiona and get support sizes
+        Kit_TruthCofactor0New( pCof0, pTruth, nVars, i );
+        Kit_TruthCofactor1New( pCof1, pTruth, nVars, i );
+        nSuppSizeCur0 = Kit_TruthSupportSize( pCof0, nVars );
+        nSuppSizeCur1 = Kit_TruthSupportSize( pCof1, nVars );
+        nSuppSizeCur  = nSuppSizeCur0 + nSuppSizeCur1;
+        // compare this variable with other variables
+        if ( nSuppSizeMin > nSuppSizeCur ) 
+        {
+            nSuppSizeMin = nSuppSizeCur;
+            iBestVar = i;
+        }
+    }
+    assert( iBestVar != -1 );
+    // cofactor w.r.t. this variable
+    Kit_TruthCofactor0New( pCof0, pTruth, nVars, iBestVar );
+    Kit_TruthCofactor1New( pCof1, pTruth, nVars, iBestVar );
+    return iBestVar;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1's in each cofactor.]
+
+  Description [The resulting numbers are stored in the array of shorts, 
+  whose length is 2*nVars. The number of 1's is counted in a different
+  space than the original function. For example, if the function depends 
+  on k variables, the cofactors are assumed to depend on k-1 variables.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCountOnesInCofs( unsigned * pTruth, int nVars, short * pStore )
+{
+    int nWords = Kit_TruthWordNum( nVars );
+    int i, k, Counter;
+    memset( pStore, 0, sizeof(short) * 2 * nVars );
+    if ( nVars <= 5 )
+    {
+        if ( nVars > 0 )
+        {
+            pStore[2*0+0] = Kit_WordCountOnes( pTruth[0] & 0x55555555 );
+            pStore[2*0+1] = Kit_WordCountOnes( pTruth[0] & 0xAAAAAAAA );
+        }
+        if ( nVars > 1 )
+        {
+            pStore[2*1+0] = Kit_WordCountOnes( pTruth[0] & 0x33333333 );
+            pStore[2*1+1] = Kit_WordCountOnes( pTruth[0] & 0xCCCCCCCC );
+        }
+        if ( nVars > 2 )
+        {
+            pStore[2*2+0] = Kit_WordCountOnes( pTruth[0] & 0x0F0F0F0F );
+            pStore[2*2+1] = Kit_WordCountOnes( pTruth[0] & 0xF0F0F0F0 );
+        }
+        if ( nVars > 3 )
+        {
+            pStore[2*3+0] = Kit_WordCountOnes( pTruth[0] & 0x00FF00FF );
+            pStore[2*3+1] = Kit_WordCountOnes( pTruth[0] & 0xFF00FF00 );
+        }
+        if ( nVars > 4 )
+        {
+            pStore[2*4+0] = Kit_WordCountOnes( pTruth[0] & 0x0000FFFF );
+            pStore[2*4+1] = Kit_WordCountOnes( pTruth[0] & 0xFFFF0000 );
+        }
+        return;
+    }
+    // nVars >= 6
+    // count 1's for all other variables
+    for ( k = 0; k < nWords; k++ )
+    {
+        Counter = Kit_WordCountOnes( pTruth[k] );
+        for ( i = 5; i < nVars; i++ )
+            if ( k & (1 << (i-5)) )
+                pStore[2*i+1] += Counter;
+            else
+                pStore[2*i+0] += Counter;
+    }
+    // count 1's for the first five variables
+    for ( k = 0; k < nWords/2; k++ )
+    {
+        pStore[2*0+0] += Kit_WordCountOnes( (pTruth[0] & 0x55555555) | ((pTruth[1] & 0x55555555) <<  1) );
+        pStore[2*0+1] += Kit_WordCountOnes( (pTruth[0] & 0xAAAAAAAA) | ((pTruth[1] & 0xAAAAAAAA) >>  1) );
+        pStore[2*1+0] += Kit_WordCountOnes( (pTruth[0] & 0x33333333) | ((pTruth[1] & 0x33333333) <<  2) );
+        pStore[2*1+1] += Kit_WordCountOnes( (pTruth[0] & 0xCCCCCCCC) | ((pTruth[1] & 0xCCCCCCCC) >>  2) );
+        pStore[2*2+0] += Kit_WordCountOnes( (pTruth[0] & 0x0F0F0F0F) | ((pTruth[1] & 0x0F0F0F0F) <<  4) );
+        pStore[2*2+1] += Kit_WordCountOnes( (pTruth[0] & 0xF0F0F0F0) | ((pTruth[1] & 0xF0F0F0F0) >>  4) );
+        pStore[2*3+0] += Kit_WordCountOnes( (pTruth[0] & 0x00FF00FF) | ((pTruth[1] & 0x00FF00FF) <<  8) );
+        pStore[2*3+1] += Kit_WordCountOnes( (pTruth[0] & 0xFF00FF00) | ((pTruth[1] & 0xFF00FF00) >>  8) );
+        pStore[2*4+0] += Kit_WordCountOnes( (pTruth[0] & 0x0000FFFF) | ((pTruth[1] & 0x0000FFFF) << 16) );
+        pStore[2*4+1] += Kit_WordCountOnes( (pTruth[0] & 0xFFFF0000) | ((pTruth[1] & 0xFFFF0000) >> 16) );
+        pTruth += 2;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Counts the number of 1's in each cofactor.]
+
+  Description [Verifies the above procedure.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCountOnesInCofsSlow( unsigned * pTruth, int nVars, short * pStore, unsigned * pAux )
+{
+    int i;
+    for ( i = 0; i < nVars; i++ )
+    {
+        Kit_TruthCofactor0New( pAux, pTruth, nVars, i );
+        pStore[2*i+0] = Kit_TruthCountOnes( pAux, nVars ) / 2;
+        Kit_TruthCofactor1New( pAux, pTruth, nVars, i );
+        pStore[2*i+1] = Kit_TruthCountOnes( pAux, nVars ) / 2;
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Canonicize the truth table.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_TruthHash( unsigned * pIn, int nWords )
+{
+    // The 1,024 smallest prime numbers used to compute the hash value
+    // http://www.math.utah.edu/~alfeld/math/primelist.html
+    static int HashPrimes[1024] = { 2, 3, 5, 
+    7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 
+    101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 
+    193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 
+    293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 
+    409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 
+    521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 
+    641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 
+    757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 
+    881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997, 
+    1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 
+    1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193, 
+    1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 
+    1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 
+    1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489, 1493, 
+    1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, 
+    1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 
+    1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, 
+    1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 
+    1933, 1949, 1951, 1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 
+    2039, 2053, 2063, 2069, 2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 
+    2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 
+    2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 
+    2371, 2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, 
+    2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, 
+    2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693, 
+    2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, 
+    2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903, 
+    2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001, 3011, 3019, 3023, 
+    3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, 
+    3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, 
+    3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 
+    3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 
+    3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 
+    3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 
+    3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 
+    3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, 
+    3943, 3947, 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 
+    4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 
+    4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273, 4283, 
+    4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409, 4421, 4423, 
+    4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517, 4519, 4523, 4547, 
+    4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621, 4637, 4639, 4643, 4649, 4651, 4657, 
+    4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, 
+    4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, 
+    4933, 4937, 4943, 4951, 4957, 4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011, 
+    5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, 
+    5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, 
+    5281, 5297, 5303, 5309, 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, 
+    5417, 5419, 5431, 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 
+    5519, 5521, 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, 
+    5651, 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743, 
+    5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851, 5857, 
+    5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939, 5953, 5981, 5987, 6007, 
+    6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091, 6101, 6113, 6121, 
+    6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, 
+    6257, 6263, 6269, 6271, 6277, 6287, 6299, 6301, 6311, 6317, 6323, 6329, 6337, 6343, 
+    6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473, 
+    6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581, 6599, 6607, 
+    6619, 6637, 6653, 6659, 6661, 6673, 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, 
+    6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, 
+    6863, 6869, 6871, 6883, 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 
+    6977, 6983, 6991, 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 
+    7109, 7121, 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, 
+    7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349, 7351, 7369, 
+    7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507, 7517, 
+    7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589, 7591, 7603, 
+    7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687, 7691, 7699, 7703, 7717, 7723, 
+    7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, 
+    7877, 7879, 7883, 7901, 7907, 7919, 7927, 7933, 7937, 7949, 7951, 7963, 7993, 8009, 
+    8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111, 8117, 8123, 
+    8147, 8161 };
+    int i;
+    unsigned uHashKey;
+    assert( nWords <= 1024 );
+    uHashKey = 0;
+    for ( i = 0; i < nWords; i++ )
+        uHashKey ^= HashPrimes[i] * pIn[i];
+    return uHashKey;
+}
+
+ 
+/**Function*************************************************************
+
+  Synopsis    [Canonicize the truth table.]
+
+  Description [Returns the phase. ]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+unsigned Kit_TruthSemiCanonicize( unsigned * pInOut, unsigned * pAux, int nVars, char * pCanonPerm, short * pStore )
+{
+//    short pStore2[32];
+    unsigned * pIn = pInOut, * pOut = pAux, * pTemp;
+//    int nWords = Kit_TruthWordNum( nVars );
+    int i, Temp, fChange, Counter;//, nOnes;//, k, j, w, Limit;
+    unsigned uCanonPhase;
+
+    // canonicize output
+    uCanonPhase = 0;
+/*
+    nOnes = Kit_TruthCountOnes(pIn, nVars);
+    if ( (nOnes > nWords * 16) )//|| ((nOnes == nWords * 16) && (pIn[0] & 1)) )
+    {
+        uCanonPhase |= (1 << nVars);
+        Kit_TruthNot( pIn, pIn, nVars );
+    }
+*/
+    // collect the minterm counts
+    Kit_TruthCountOnesInCofs( pIn, nVars, pStore );
+//    Kit_TruthCountOnesInCofsSlow( pIn, nVars, pStore2, pAux );
+//    for ( i = 0; i < 2*nVars; i++ )
+//    {
+//        assert( pStore[i] == pStore2[i] );
+//    }
+
+    // canonicize phase
+    for ( i = 0; i < nVars; i++ )
+    {
+        if ( pStore[2*i+0] >= pStore[2*i+1] )
+            continue;
+        uCanonPhase |= (1 << i);
+        Temp = pStore[2*i+0];
+        pStore[2*i+0] = pStore[2*i+1];
+        pStore[2*i+1] = Temp;
+        Kit_TruthChangePhase( pIn, nVars, i );
+    }
+
+//    Kit_PrintHexadecimal( stdout, pIn, nVars );
+//    printf( "\n" );
+
+    // permute
+    Counter = 0;
+    do {
+        fChange = 0;
+        for ( i = 0; i < nVars-1; i++ )
+        {
+            if ( pStore[2*i] >= pStore[2*(i+1)] )
+                continue;
+            Counter++;
+            fChange = 1;
+
+            Temp = pCanonPerm[i];
+            pCanonPerm[i] = pCanonPerm[i+1];
+            pCanonPerm[i+1] = Temp;
+
+            Temp = pStore[2*i];
+            pStore[2*i] = pStore[2*(i+1)];
+            pStore[2*(i+1)] = Temp;
+
+            Temp = pStore[2*i+1];
+            pStore[2*i+1] = pStore[2*(i+1)+1];
+            pStore[2*(i+1)+1] = Temp;
+
+            // if the polarity of variables is different, swap them
+            if ( ((uCanonPhase & (1 << i)) > 0) != ((uCanonPhase & (1 << (i+1))) > 0) )
+            {
+                uCanonPhase ^= (1 << i);
+                uCanonPhase ^= (1 << (i+1));
+            }
+
+            Kit_TruthSwapAdjacentVars( pOut, pIn, nVars, i );
+            pTemp = pIn; pIn = pOut; pOut = pTemp;
+        }
+    } while ( fChange );
+
+/*
+    Extra_PrintBinary( stdout, &uCanonPhase, nVars+1 ); printf( " : " );
+    for ( i = 0; i < nVars; i++ )
+        printf( "%d=%d/%d  ", pCanonPerm[i], pStore[2*i], pStore[2*i+1] );
+    printf( "  C = %d\n", Counter );
+    Extra_PrintHexadecimal( stdout, pIn, nVars );
+    printf( "\n" );
+*/
+
+/*
+    // process symmetric variable groups
+    uSymms = 0;
+    for ( i = 0; i < nVars-1; i++ )
+    {
+        if ( pStore[2*i] != pStore[2*(i+1)] ) // i and i+1 cannot be symmetric
+            continue;
+        if ( pStore[2*i] != pStore[2*i+1] )
+            continue;
+        if ( Kit_TruthVarsSymm( pIn, nVars, i, i+1 ) )
+            continue;
+        if ( Kit_TruthVarsAntiSymm( pIn, nVars, i, i+1 ) )
+            Kit_TruthChangePhase( pIn, nVars, i+1 );
+    }
+*/
+
+/*
+    // process symmetric variable groups
+    uSymms = 0;
+    for ( i = 0; i < nVars-1; i++ )
+    {
+        if ( pStore[2*i] != pStore[2*(i+1)] ) // i and i+1 cannot be symmetric
+            continue;
+        // i and i+1 can be symmetric
+        // find the end of this group
+        for ( k = i+1; k < nVars; k++ )
+            if ( pStore[2*i] != pStore[2*k] ) 
+                break;
+        Limit = k;
+        assert( i < Limit-1 );
+        // go through the variables in this group
+        for ( j = i + 1; j < Limit; j++ )
+        {
+            // check symmetry
+            if ( Kit_TruthVarsSymm( pIn, nVars, i, j ) )
+            {
+                uSymms |= (1 << j);
+                continue;
+            }
+            // they are phase-unknown
+            if ( pStore[2*i] == pStore[2*i+1] ) 
+            {
+                if ( Kit_TruthVarsAntiSymm( pIn, nVars, i, j ) )
+                {
+                    Kit_TruthChangePhase( pIn, nVars, j );
+                    uCanonPhase ^= (1 << j);
+                    uSymms |= (1 << j);
+                    continue;
+                }
+            }
+
+            // they are not symmetric - move j as far as it goes in the group
+            for ( k = j; k < Limit-1; k++ )
+            {
+                Counter++;
+
+                Temp = pCanonPerm[k];
+                pCanonPerm[k] = pCanonPerm[k+1];
+                pCanonPerm[k+1] = Temp;
+
+                assert( pStore[2*k] == pStore[2*(k+1)] );
+                Kit_TruthSwapAdjacentVars( pOut, pIn, nVars, k );
+                pTemp = pIn; pIn = pOut; pOut = pTemp;
+            }
+            Limit--;
+            j--;
+        }
+        i = Limit - 1;
+    }
+*/
+
+    // swap if it was moved an even number of times
+    if ( Counter & 1 )
+        Kit_TruthCopy( pOut, pIn, nVars );
+    return uCanonPhase;
+}
+
+ 
+/**Function*************************************************************
+
+  Synopsis    [Fast counting minterms in the cofactors of a function.]
+
+  Description [Returns the total number of minterms in the function.
+  The resulting array (pRes) contains the number of minterms in 0-cofactor
+  w.r.t. each variables. The additional array (pBytes) is used for internal 
+  storage. It should have the size equal to the number of truth table bytes.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Kit_TruthCountMinterms( unsigned * pTruth, int nVars, int * pRes, int * pBytes )
+{
+    // the number of 1s if every byte as well as in the 0-cofactors w.r.t. three variables
+    static unsigned Table[256] = {
+        0x00000000, 0x01010101, 0x01010001, 0x02020102, 0x01000101, 0x02010202, 0x02010102, 0x03020203,
+        0x01000001, 0x02010102, 0x02010002, 0x03020103, 0x02000102, 0x03010203, 0x03010103, 0x04020204,
+        0x00010101, 0x01020202, 0x01020102, 0x02030203, 0x01010202, 0x02020303, 0x02020203, 0x03030304,
+        0x01010102, 0x02020203, 0x02020103, 0x03030204, 0x02010203, 0x03020304, 0x03020204, 0x04030305,
+        0x00010001, 0x01020102, 0x01020002, 0x02030103, 0x01010102, 0x02020203, 0x02020103, 0x03030204,
+        0x01010002, 0x02020103, 0x02020003, 0x03030104, 0x02010103, 0x03020204, 0x03020104, 0x04030205,
+        0x00020102, 0x01030203, 0x01030103, 0x02040204, 0x01020203, 0x02030304, 0x02030204, 0x03040305,
+        0x01020103, 0x02030204, 0x02030104, 0x03040205, 0x02020204, 0x03030305, 0x03030205, 0x04040306,
+        0x00000101, 0x01010202, 0x01010102, 0x02020203, 0x01000202, 0x02010303, 0x02010203, 0x03020304,
+        0x01000102, 0x02010203, 0x02010103, 0x03020204, 0x02000203, 0x03010304, 0x03010204, 0x04020305,
+        0x00010202, 0x01020303, 0x01020203, 0x02030304, 0x01010303, 0x02020404, 0x02020304, 0x03030405,
+        0x01010203, 0x02020304, 0x02020204, 0x03030305, 0x02010304, 0x03020405, 0x03020305, 0x04030406,
+        0x00010102, 0x01020203, 0x01020103, 0x02030204, 0x01010203, 0x02020304, 0x02020204, 0x03030305,
+        0x01010103, 0x02020204, 0x02020104, 0x03030205, 0x02010204, 0x03020305, 0x03020205, 0x04030306,
+        0x00020203, 0x01030304, 0x01030204, 0x02040305, 0x01020304, 0x02030405, 0x02030305, 0x03040406,
+        0x01020204, 0x02030305, 0x02030205, 0x03040306, 0x02020305, 0x03030406, 0x03030306, 0x04040407,
+        0x00000001, 0x01010102, 0x01010002, 0x02020103, 0x01000102, 0x02010203, 0x02010103, 0x03020204,
+        0x01000002, 0x02010103, 0x02010003, 0x03020104, 0x02000103, 0x03010204, 0x03010104, 0x04020205,
+        0x00010102, 0x01020203, 0x01020103, 0x02030204, 0x01010203, 0x02020304, 0x02020204, 0x03030305,
+        0x01010103, 0x02020204, 0x02020104, 0x03030205, 0x02010204, 0x03020305, 0x03020205, 0x04030306,
+        0x00010002, 0x01020103, 0x01020003, 0x02030104, 0x01010103, 0x02020204, 0x02020104, 0x03030205,
+        0x01010003, 0x02020104, 0x02020004, 0x03030105, 0x02010104, 0x03020205, 0x03020105, 0x04030206,
+        0x00020103, 0x01030204, 0x01030104, 0x02040205, 0x01020204, 0x02030305, 0x02030205, 0x03040306,
+        0x01020104, 0x02030205, 0x02030105, 0x03040206, 0x02020205, 0x03030306, 0x03030206, 0x04040307,
+        0x00000102, 0x01010203, 0x01010103, 0x02020204, 0x01000203, 0x02010304, 0x02010204, 0x03020305,
+        0x01000103, 0x02010204, 0x02010104, 0x03020205, 0x02000204, 0x03010305, 0x03010205, 0x04020306,
+        0x00010203, 0x01020304, 0x01020204, 0x02030305, 0x01010304, 0x02020405, 0x02020305, 0x03030406,
+        0x01010204, 0x02020305, 0x02020205, 0x03030306, 0x02010305, 0x03020406, 0x03020306, 0x04030407,
+        0x00010103, 0x01020204, 0x01020104, 0x02030205, 0x01010204, 0x02020305, 0x02020205, 0x03030306,
+        0x01010104, 0x02020205, 0x02020105, 0x03030206, 0x02010205, 0x03020306, 0x03020206, 0x04030307,
+        0x00020204, 0x01030305, 0x01030205, 0x02040306, 0x01020305, 0x02030406, 0x02030306, 0x03040407,
+        0x01020205, 0x02030306, 0x02030206, 0x03040307, 0x02020306, 0x03030407, 0x03030307, 0x04040408
+    };
+    unsigned uSum;
+    unsigned char * pTruthC, * pLimit;
+    int i, iVar, Step, nWords, nBytes, nTotal;
+
+    assert( nVars <= 20 );
+
+    // clear storage
+    memset( pRes, 0, sizeof(int) * nVars );
+
+    // count the number of one's in 0-cofactors of the first three variables
+    nTotal = uSum = 0;
+    nWords = Kit_TruthWordNum( nVars );
+    nBytes = nWords * 4;
+    pTruthC = (unsigned char *)pTruth;
+    pLimit = pTruthC + nBytes;
+    for ( ; pTruthC < pLimit; pTruthC++ )
+    {
+        uSum += Table[*pTruthC];
+        *pBytes++ = (Table[*pTruthC] & 0xff);
+        if ( (uSum & 0xff) > 246 )
+        {
+            nTotal += (uSum & 0xff);
+            pRes[0] += ((uSum >>  8) & 0xff);
+            pRes[2] += ((uSum >> 16) & 0xff);
+            pRes[3] += ((uSum >> 24) & 0xff);
+            uSum = 0;
+        }
+    }
+    if ( uSum )
+    {
+        nTotal += (uSum & 0xff);
+        pRes[0] += ((uSum >>  8) & 0xff);
+        pRes[1] += ((uSum >> 16) & 0xff);
+        pRes[2] += ((uSum >> 24) & 0xff);
+    }
+
+    // count all other variables
+    for ( iVar = 3, Step = 1; Step < nBytes; Step *= 2, iVar++ )
+        for ( i = 0; i < nBytes; i += Step + Step )
+        {
+            pRes[iVar] += pBytes[i];
+            pBytes[i] += pBytes[i+Step];
+        }
+    assert( pBytes[0] == nTotal );
+    assert( iVar == nVars );
+    return nTotal;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Prints the hex unsigned into a file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_PrintHexadecimal( FILE * pFile, unsigned Sign[], int nVars )
+{
+    int nDigits, Digit, k;
+    // write the number into the file
+    nDigits = (1 << nVars) / 4;
+    for ( k = nDigits - 1; k >= 0; k-- )
+    {
+        Digit = ((Sign[k/8] >> ((k%8) * 4)) & 15);
+        if ( Digit < 10 )
+            fprintf( pFile, "%d", Digit );
+        else
+            fprintf( pFile, "%c", 'a' + Digit-10 );
+    }
+//    fprintf( pFile, "\n" );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Fast counting minterms for the functions.]
+
+  Description [Returns 0 if the function is a constant.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Kit_TruthCountMintermsPrecomp()
+{
+    int bit_count[256] = {
+      0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+      1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+      1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+      2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+      1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+      2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+      2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+      3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
+    };
+    unsigned i, uWord;
+    for ( i = 0; i < 256; i++ )
+    {
+        if ( i % 8 == 0 )
+            printf( "\n" );
+        uWord  =  bit_count[i];
+        uWord |= (bit_count[i & 0x55] <<  8);
+        uWord |= (bit_count[i & 0x33] << 16);
+        uWord |= (bit_count[i & 0x0f] << 24);
+        printf( "0x" );
+        Kit_PrintHexadecimal( stdout, &uWord, 5 );
+        printf( ", " );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Dumps truth table into a file.]
+
+  Description [Generates script file for reading into ABC.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Kit_TruthDumpToFile( unsigned * pTruth, int nVars, int nFile )
+{
+    static char pFileName[100];
+    FILE * pFile;
+    sprintf( pFileName, "tt\\s%04d", nFile );
+    pFile = fopen( pFileName, "w" );
+    fprintf( pFile, "rt " );
+    Kit_PrintHexadecimal( pFile, pTruth, nVars );
+    fprintf( pFile, "; bdd; sop; ps\n" );
+    fclose( pFile );
+    return pFileName;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/kit_.c b/abc70930/src/aig/kit/kit_.c
new file mode 100644
index 00000000..5c68ee3c
--- /dev/null
+++ b/abc70930/src/aig/kit/kit_.c
@@ -0,0 +1,48 @@
+/**CFile****************************************************************
+
+  FileName    [kit_.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Computation kit.]
+
+  Synopsis    []
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Dec 6, 2006.]
+
+  Revision    [$Id: kit_.c,v 1.00 2006/12/06 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "kit.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/kit/module.make b/abc70930/src/aig/kit/module.make
new file mode 100644
index 00000000..ea62381b
--- /dev/null
+++ b/abc70930/src/aig/kit/module.make
@@ -0,0 +1,10 @@
+SRC +=  src/aig/kit/kitAig.c \
+    src/aig/kit/kitBdd.c \
+    src/aig/kit/kitCloud.c src/aig/kit/cloud.c \
+    src/aig/kit/kitDsd.c \
+    src/aig/kit/kitFactor.c \
+    src/aig/kit/kitGraph.c \
+    src/aig/kit/kitHop.c \
+    src/aig/kit/kitIsop.c \
+    src/aig/kit/kitSop.c \
+    src/aig/kit/kitTruth.c
diff --git a/abc70930/src/aig/mem/mem.c b/abc70930/src/aig/mem/mem.c
new file mode 100644
index 00000000..f5bfbfd8
--- /dev/null
+++ b/abc70930/src/aig/mem/mem.c
@@ -0,0 +1,604 @@
+/**CFile****************************************************************
+
+  FileName    [esopMem.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Cover manipulation package.]
+
+  Synopsis    [Memory managers.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: esopMem.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include "mem.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+struct Mem_Fixed_t_
+{
+    // information about individual entries
+    int           nEntrySize;    // the size of one entry
+    int           nEntriesAlloc; // the total number of entries allocated
+    int           nEntriesUsed;  // the number of entries in use
+    int           nEntriesMax;   // the max number of entries in use
+    char *        pEntriesFree;  // the linked list of free entries
+
+    // this is where the memory is stored
+    int           nChunkSize;    // the size of one chunk
+    int           nChunksAlloc;  // the maximum number of memory chunks 
+    int           nChunks;       // the current number of memory chunks 
+    char **       pChunks;       // the allocated memory
+
+    // statistics
+    int           nMemoryUsed;   // memory used in the allocated entries
+    int           nMemoryAlloc;  // memory allocated
+};
+
+struct Mem_Flex_t_
+{
+    // information about individual entries
+    int           nEntriesUsed;  // the number of entries allocated
+    char *        pCurrent;      // the current pointer to free memory
+    char *        pEnd;          // the first entry outside the free memory
+
+    // this is where the memory is stored
+    int           nChunkSize;    // the size of one chunk
+    int           nChunksAlloc;  // the maximum number of memory chunks 
+    int           nChunks;       // the current number of memory chunks 
+    char **       pChunks;       // the allocated memory
+
+    // statistics
+    int           nMemoryUsed;   // memory used in the allocated entries
+    int           nMemoryAlloc;  // memory allocated
+};
+
+struct Mem_Step_t_
+{
+    int             nMems;    // the number of fixed memory managers employed
+    Mem_Fixed_t **  pMems;    // memory managers: 2^1 words, 2^2 words, etc
+    int             nMapSize; // the size of the memory array
+    Mem_Fixed_t **  pMap;     // maps the number of bytes into its memory manager
+};
+
+#define ALLOC(type, num)     ((type *) malloc(sizeof(type) * (num)))
+#define FREE(obj)             ((obj) ? (free((char *) (obj)), (obj) = 0) : 0)
+#define REALLOC(type, obj, num)    \
+        ((obj) ? ((type *) realloc((char *)(obj), sizeof(type) * (num))) : \
+         ((type *) malloc(sizeof(type) * (num))))
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates memory pieces of fixed size.]
+
+  Description [The size of the chunk is computed as the minimum of
+  1024 entries and 64K. Can only work with entry size at least 4 byte long.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Mem_Fixed_t * Mem_FixedStart( int nEntrySize )
+{
+    Mem_Fixed_t * p;
+
+    p = ALLOC( Mem_Fixed_t, 1 );
+    memset( p, 0, sizeof(Mem_Fixed_t) );
+
+    p->nEntrySize    = nEntrySize;
+    p->nEntriesAlloc = 0;
+    p->nEntriesUsed  = 0;
+    p->pEntriesFree  = NULL;
+
+    if ( nEntrySize * (1 << 10) < (1<<16) )
+        p->nChunkSize = (1 << 10);
+    else
+        p->nChunkSize = (1<<16) / nEntrySize;
+    if ( p->nChunkSize < 8 )
+        p->nChunkSize = 8;
+
+    p->nChunksAlloc  = 64;
+    p->nChunks       = 0;
+    p->pChunks       = ALLOC( char *, p->nChunksAlloc );
+
+    p->nMemoryUsed   = 0;
+    p->nMemoryAlloc  = 0;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_FixedStop( Mem_Fixed_t * p, int fVerbose )
+{
+    int i;
+    if ( p == NULL )
+        return;
+    if ( fVerbose )
+    {
+        printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n",
+            p->nEntrySize, p->nChunkSize, p->nChunks );
+        printf( "   Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n",
+            p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc );
+    }
+    for ( i = 0; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    free( p->pChunks );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Mem_FixedEntryFetch( Mem_Fixed_t * p )
+{
+    char * pTemp;
+    int i;
+
+    // check if there are still free entries
+    if ( p->nEntriesUsed == p->nEntriesAlloc )
+    { // need to allocate more entries
+        assert( p->pEntriesFree == NULL );
+        if ( p->nChunks == p->nChunksAlloc )
+        {
+            p->nChunksAlloc *= 2;
+            p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); 
+        }
+        p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize );
+        p->nMemoryAlloc += p->nEntrySize * p->nChunkSize;
+        // transform these entries into a linked list
+        pTemp = p->pEntriesFree;
+        for ( i = 1; i < p->nChunkSize; i++ )
+        {
+            *((char **)pTemp) = pTemp + p->nEntrySize;
+            pTemp += p->nEntrySize;
+        }
+        // set the last link
+        *((char **)pTemp) = NULL;
+        // add the chunk to the chunk storage
+        p->pChunks[ p->nChunks++ ] = p->pEntriesFree;
+        // add to the number of entries allocated
+        p->nEntriesAlloc += p->nChunkSize;
+    }
+    // incrememt the counter of used entries
+    p->nEntriesUsed++;
+    if ( p->nEntriesMax < p->nEntriesUsed )
+        p->nEntriesMax = p->nEntriesUsed;
+    // return the first entry in the free entry list
+    pTemp = p->pEntriesFree;
+    p->pEntriesFree = *((char **)pTemp);
+    return pTemp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_FixedEntryRecycle( Mem_Fixed_t * p, char * pEntry )
+{
+    // decrement the counter of used entries
+    p->nEntriesUsed--;
+    // add the entry to the linked list of free entries
+    *((char **)pEntry) = p->pEntriesFree;
+    p->pEntriesFree = pEntry;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description [Relocates all the memory except the first chunk.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_FixedRestart( Mem_Fixed_t * p )
+{
+    int i;
+    char * pTemp;
+
+    // deallocate all chunks except the first one
+    for ( i = 1; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    p->nChunks = 1;
+    // transform these entries into a linked list
+    pTemp = p->pChunks[0];
+    for ( i = 1; i < p->nChunkSize; i++ )
+    {
+        *((char **)pTemp) = pTemp + p->nEntrySize;
+        pTemp += p->nEntrySize;
+    }
+    // set the last link
+    *((char **)pTemp) = NULL;
+    // set the free entry list
+    p->pEntriesFree  = p->pChunks[0];
+    // set the correct statistics
+    p->nMemoryAlloc  = p->nEntrySize * p->nChunkSize;
+    p->nMemoryUsed   = 0;
+    p->nEntriesAlloc = p->nChunkSize;
+    p->nEntriesUsed  = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Mem_FixedReadMemUsage( Mem_Fixed_t * p )
+{
+    return p->nMemoryAlloc;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Mem_FixedReadMaxEntriesUsed( Mem_Fixed_t * p )
+{
+    return p->nEntriesMax;
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Allocates entries of flexible size.]
+
+  Description [Can only work with entry size at least 4 byte long.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Mem_Flex_t * Mem_FlexStart()
+{
+    Mem_Flex_t * p;
+
+    p = ALLOC( Mem_Flex_t, 1 );
+    memset( p, 0, sizeof(Mem_Flex_t) );
+
+    p->nEntriesUsed  = 0;
+    p->pCurrent      = NULL;
+    p->pEnd          = NULL;
+
+    p->nChunkSize    = (1 << 14);
+    p->nChunksAlloc  = 64;
+    p->nChunks       = 0;
+    p->pChunks       = ALLOC( char *, p->nChunksAlloc );
+
+    p->nMemoryUsed   = 0;
+    p->nMemoryAlloc  = 0;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_FlexStop( Mem_Flex_t * p, int fVerbose )
+{
+    int i;
+    if ( p == NULL )
+        return;
+    if ( fVerbose )
+    {
+        printf( "Flexible memory manager: Chunk size = %d. Chunks used = %d.\n",
+            p->nChunkSize, p->nChunks );
+        printf( "   Entries used = %d. Memory used = %d. Memory alloc = %d.\n",
+            p->nEntriesUsed, p->nMemoryUsed, p->nMemoryAlloc );
+    }
+    for ( i = 0; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    free( p->pChunks );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Mem_FlexEntryFetch( Mem_Flex_t * p, int nBytes )
+{
+    char * pTemp;
+    // check if there are still free entries
+    if ( p->pCurrent == NULL || p->pCurrent + nBytes > p->pEnd )
+    { // need to allocate more entries
+        if ( p->nChunks == p->nChunksAlloc )
+        {
+            p->nChunksAlloc *= 2;
+            p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); 
+        }
+        if ( nBytes > p->nChunkSize )
+        {
+            // resize the chunk size if more memory is requested than it can give
+            // (ideally, this should never happen)
+            p->nChunkSize = 2 * nBytes;
+        }
+        p->pCurrent = ALLOC( char, p->nChunkSize );
+        p->pEnd     = p->pCurrent + p->nChunkSize;
+        p->nMemoryAlloc += p->nChunkSize;
+        // add the chunk to the chunk storage
+        p->pChunks[ p->nChunks++ ] = p->pCurrent;
+    }
+    assert( p->pCurrent + nBytes <= p->pEnd );
+    // increment the counter of used entries
+    p->nEntriesUsed++;
+    // keep track of the memory used
+    p->nMemoryUsed += nBytes;
+    // return the next entry
+    pTemp = p->pCurrent;
+    p->pCurrent += nBytes;
+    return pTemp;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description [Relocates all the memory except the first chunk.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_FlexRestart( Mem_Flex_t * p )
+{
+    int i;
+    if ( p->nChunks == 0 )
+        return;
+    // deallocate all chunks except the first one
+    for ( i = 1; i < p->nChunks; i++ )
+        free( p->pChunks[i] );
+    p->nChunks  = 1;
+    p->nMemoryAlloc = p->nChunkSize;
+    // transform these entries into a linked list
+    p->pCurrent = p->pChunks[0];
+    p->pEnd     = p->pCurrent + p->nChunkSize;
+    p->nEntriesUsed = 0;
+    p->nMemoryUsed = 0;
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Mem_FlexReadMemUsage( Mem_Flex_t * p )
+{
+    return p->nMemoryUsed;
+}
+
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Starts the hierarchical memory manager.]
+
+  Description [This manager can allocate entries of any size.
+  Iternally they are mapped into the entries with the number of bytes
+  equal to the power of 2. The smallest entry size is 8 bytes. The
+  next one is 16 bytes etc. So, if the user requests 6 bytes, he gets 
+  8 byte entry. If we asks for 25 bytes, he gets 32 byte entry etc.
+  The input parameters "nSteps" says how many fixed memory managers
+  are employed internally. Calling this procedure with nSteps equal
+  to 10 results in 10 hierarchically arranged internal memory managers, 
+  which can allocate up to 4096 (1Kb) entries. Requests for larger 
+  entries are handed over to malloc() and then free()ed.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Mem_Step_t * Mem_StepStart( int nSteps )
+{
+    Mem_Step_t * p;
+    int i, k;
+    p = ALLOC( Mem_Step_t, 1 );
+    memset( p, 0, sizeof(Mem_Step_t) );
+    p->nMems = nSteps;
+    // start the fixed memory managers
+    p->pMems = ALLOC( Mem_Fixed_t *, p->nMems );
+    for ( i = 0; i < p->nMems; i++ )
+        p->pMems[i] = Mem_FixedStart( (8<<i) );
+    // set up the mapping of the required memory size into the corresponding manager
+    p->nMapSize = (4<<p->nMems);
+    p->pMap = ALLOC( Mem_Fixed_t *, p->nMapSize+1 );
+    p->pMap[0] = NULL;
+    for ( k = 1; k <= 4; k++ )
+        p->pMap[k] = p->pMems[0];
+    for ( i = 0; i < p->nMems; i++ )
+        for ( k = (4<<i)+1; k <= (8<<i); k++ )
+            p->pMap[k] = p->pMems[i];
+//for ( i = 1; i < 100; i ++ )
+//printf( "%10d: size = %10d\n", i, p->pMap[i]->nEntrySize );
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the memory manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_StepStop( Mem_Step_t * p, int fVerbose )
+{
+    int i;
+    for ( i = 0; i < p->nMems; i++ )
+        Mem_FixedStop( p->pMems[i], fVerbose );
+//    if ( p->pLargeChunks ) 
+//    {
+//      for ( i = 0; i < p->nLargeChunks; i++ )
+//          free( p->pLargeChunks[i] );
+//      free( p->pLargeChunks );
+//    }
+    free( p->pMems );
+    free( p->pMap );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Creates the entry.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Mem_StepEntryFetch( Mem_Step_t * p, int nBytes )
+{
+    if ( nBytes == 0 )
+        return NULL;
+    if ( nBytes > p->nMapSize )
+    {
+//        printf( "Allocating %d bytes.\n", nBytes );
+/*
+        if ( p->nLargeChunks == p->nLargeChunksAlloc )
+        {
+            if ( p->nLargeChunksAlloc == 0 )
+                p->nLargeChunksAlloc = 5;
+            p->nLargeChunksAlloc *= 2;
+            p->pLargeChunks = REALLOC( char *, p->pLargeChunks, p->nLargeChunksAlloc ); 
+        }
+        p->pLargeChunks[ p->nLargeChunks++ ] = ALLOC( char, nBytes );
+        return p->pLargeChunks[ p->nLargeChunks - 1 ];
+*/
+        return ALLOC( char, nBytes );
+    }
+    return Mem_FixedEntryFetch( p->pMap[nBytes] );
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Recycles the entry.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Mem_StepEntryRecycle( Mem_Step_t * p, char * pEntry, int nBytes )
+{
+    if ( nBytes == 0 )
+        return;
+    if ( nBytes > p->nMapSize )
+    {
+        free( pEntry );
+        return;
+    }
+    Mem_FixedEntryRecycle( p->pMap[nBytes], pEntry );
+}
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Mem_StepReadMemUsage( Mem_Step_t * p )
+{
+    int i, nMemTotal = 0;
+    for ( i = 0; i < p->nMems; i++ )
+        nMemTotal += p->pMems[i]->nMemoryAlloc;
+    return nMemTotal;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
diff --git a/abc70930/src/aig/mem/mem.h b/abc70930/src/aig/mem/mem.h
new file mode 100644
index 00000000..d43e5fc3
--- /dev/null
+++ b/abc70930/src/aig/mem/mem.h
@@ -0,0 +1,72 @@
+/**CFile****************************************************************
+
+  FileName    [mem.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Memory management.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: mem.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#ifndef __MEM_H__
+#define __MEM_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+typedef struct Mem_Fixed_t_    Mem_Fixed_t;    
+typedef struct Mem_Flex_t_     Mem_Flex_t;     
+typedef struct Mem_Step_t_     Mem_Step_t;     
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+ 
+/*=== mem.c ===========================================================*/
+// fixed-size-block memory manager
+extern Mem_Fixed_t * Mem_FixedStart( int nEntrySize );
+extern void          Mem_FixedStop( Mem_Fixed_t * p, int fVerbose );
+extern char *        Mem_FixedEntryFetch( Mem_Fixed_t * p );
+extern void          Mem_FixedEntryRecycle( Mem_Fixed_t * p, char * pEntry );
+extern void          Mem_FixedRestart( Mem_Fixed_t * p );
+extern int           Mem_FixedReadMemUsage( Mem_Fixed_t * p );
+extern int           Mem_FixedReadMaxEntriesUsed( Mem_Fixed_t * p );
+// flexible-size-block memory manager
+extern Mem_Flex_t *  Mem_FlexStart();
+extern void          Mem_FlexStop( Mem_Flex_t * p, int fVerbose );
+extern char *        Mem_FlexEntryFetch( Mem_Flex_t * p, int nBytes );
+extern void          Mem_FlexRestart( Mem_Flex_t * p );
+extern int           Mem_FlexReadMemUsage( Mem_Flex_t * p );
+// hierarchical memory manager
+extern Mem_Step_t *  Mem_StepStart( int nSteps );
+extern void          Mem_StepStop( Mem_Step_t * p, int fVerbose );
+extern char *        Mem_StepEntryFetch( Mem_Step_t * p, int nBytes );
+extern void          Mem_StepEntryRecycle( Mem_Step_t * p, char * pEntry, int nBytes );
+extern int           Mem_StepReadMemUsage( Mem_Step_t * p );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/mem/module.make b/abc70930/src/aig/mem/module.make
new file mode 100644
index 00000000..ae6fcbe4
--- /dev/null
+++ b/abc70930/src/aig/mem/module.make
@@ -0,0 +1 @@
+SRC +=    src/aig/mem/mem.c 
diff --git a/abc70930/src/aig/rwt/module.make b/abc70930/src/aig/rwt/module.make
new file mode 100644
index 00000000..439d576f
--- /dev/null
+++ b/abc70930/src/aig/rwt/module.make
@@ -0,0 +1,3 @@
+SRC +=  src/aig/rwt/rwtDec.c \
+    src/aig/rwt/rwtMan.c \
+    src/aig/rwt/rwtUtil.c
diff --git a/abc70930/src/aig/rwt/rwt.h b/abc70930/src/aig/rwt/rwt.h
new file mode 100644
index 00000000..9199ff2a
--- /dev/null
+++ b/abc70930/src/aig/rwt/rwt.h
@@ -0,0 +1,156 @@
+/**CFile****************************************************************
+
+  FileName    [rwt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting package.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: rwt.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __RWT_H__
+#define __RWT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include "mem.h"
+#include "extra.h"
+#include "vec.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+ 
+#define RWT_LIMIT  1048576/4  // ((1 << 20) 
+#define RWT_MIN(a,b)      (((a) < (b))? (a) : (b))
+#define RWT_MAX(a,b)      (((a) > (b))? (a) : (b))
+
+typedef struct Rwt_Man_t_   Rwt_Man_t;
+typedef struct Rwt_Node_t_  Rwt_Node_t;
+
+struct Rwt_Man_t_
+{
+    // internal lookups
+    int                nFuncs;           // number of four var functions
+    unsigned short *   puCanons;         // canonical forms
+    char *             pPhases;          // canonical phases
+    char *             pPerms;           // canonical permutations
+    unsigned char *    pMap;             // mapping of functions into class numbers
+    unsigned short *   pMapInv;          // mapping of classes into functions
+    char *             pPractical;       // practical NPN classes
+    char **            pPerms4;          // four-var permutations
+    // node space
+    Vec_Ptr_t *        vForest;          // all the nodes
+    Rwt_Node_t **      pTable;           // the hash table of nodes by their canonical form
+    Vec_Vec_t *        vClasses;         // the nodes of the equivalence classes
+    Mem_Fixed_t *      pMmNode;          // memory for nodes and cuts
+    // statistical variables
+    int                nTravIds;         // the counter of traversal IDs
+    int                nConsidered;      // the number of nodes considered
+    int                nAdded;           // the number of nodes added to lists
+    int                nClasses;         // the number of NN classes
+    // the result of resynthesis
+    int                fCompl;           // indicates if the output of FF should be complemented
+    void *             pCut;             // the decomposition tree (temporary)
+    void *             pGraph;           // the decomposition tree (temporary)
+    char *             pPerm;            // permutation used for the best cut
+    Vec_Ptr_t *        vFanins;          // the fanins array (temporary)
+    Vec_Ptr_t *        vFaninsCur;       // the fanins array (temporary)
+    Vec_Int_t *        vLevNums;         // the array of levels (temporary)
+    Vec_Ptr_t *        vNodesTemp;       // the nodes in MFFC (temporary)
+    // node statistics
+    int                nNodesConsidered;
+    int                nNodesRewritten;
+    int                nNodesGained;
+    int                nScores[222];
+    int                nCutsGood;
+    int                nCutsBad;
+    int                nSubgraphs;
+    // runtime statistics
+    int                timeStart;
+    int                timeTruth;
+    int                timeCut;
+    int                timeRes;
+    int                timeEval;
+    int                timeMffc;
+    int                timeUpdate;
+    int                timeTotal;
+};
+
+struct Rwt_Node_t_ // 24 bytes
+{
+    int                Id;               // ID 
+    int                TravId;           // traversal ID
+    unsigned           uTruth : 16;      // truth table
+    unsigned           Volume :  8;      // volume
+    unsigned           Level  :  6;      // level
+    unsigned           fUsed  :  1;      // mark
+    unsigned           fExor  :  1;      // mark
+    Rwt_Node_t *       p0;               // first child
+    Rwt_Node_t *       p1;               // second child
+    Rwt_Node_t *       pNext;            // next in the table
+};
+
+// manipulation of complemented attributes
+static inline int          Rwt_IsComplement( Rwt_Node_t * p )    { return (int)(((unsigned long)p) & 01);            }
+static inline Rwt_Node_t * Rwt_Regular( Rwt_Node_t * p )         { return (Rwt_Node_t *)((unsigned long)(p) & ~01);  }
+static inline Rwt_Node_t * Rwt_Not( Rwt_Node_t * p )             { return (Rwt_Node_t *)((unsigned long)(p) ^  01);  }
+static inline Rwt_Node_t * Rwt_NotCond( Rwt_Node_t * p, int c )  { return (Rwt_Node_t *)((unsigned long)(p) ^ (c));  }
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== rwrDec.c ========================================================*/
+extern void              Rwt_ManPreprocess( Rwt_Man_t * p );
+/*=== rwrMan.c ========================================================*/
+extern Rwt_Man_t *       Rwt_ManStart( int fPrecompute );
+extern void              Rwt_ManStop( Rwt_Man_t * p );
+extern void              Rwt_ManPrintStats( Rwt_Man_t * p );
+extern void              Rwt_ManPrintStatsFile( Rwt_Man_t * p );
+extern void *            Rwt_ManReadDecs( Rwt_Man_t * p );
+extern Vec_Ptr_t *       Rwt_ManReadLeaves( Rwt_Man_t * p );
+extern int               Rwt_ManReadCompl( Rwt_Man_t * p );
+extern void              Rwt_ManAddTimeCuts( Rwt_Man_t * p, int Time );
+extern void              Rwt_ManAddTimeUpdate( Rwt_Man_t * p, int Time );
+extern void              Rwt_ManAddTimeTotal( Rwt_Man_t * p, int Time );
+/*=== rwrUtil.c ========================================================*/
+extern void              Rwt_ManLoadFromArray( Rwt_Man_t * p, int fVerbose );
+extern char *            Rwt_ManGetPractical( Rwt_Man_t * p );
+extern Rwt_Node_t *      Rwt_ManAddVar( Rwt_Man_t * p, unsigned uTruth, int fPrecompute );
+extern void              Rwt_ManIncTravId( Rwt_Man_t * p );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
diff --git a/abc70930/src/aig/rwt/rwtDec.c b/abc70930/src/aig/rwt/rwtDec.c
new file mode 100644
index 00000000..98019629
--- /dev/null
+++ b/abc70930/src/aig/rwt/rwtDec.c
@@ -0,0 +1,150 @@
+/**CFile****************************************************************
+
+  FileName    [rwtDec.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting package.]
+
+  Synopsis    [Evaluation and decomposition procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: rwtDec.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "rwt.h"
+#include "deco.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode );
+static Dec_Edge_t    Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph );
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Preprocesses computed library of subgraphs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManPreprocess( Rwt_Man_t * p )
+{
+    Dec_Graph_t * pGraph;
+    Rwt_Node_t * pNode;
+    int i, k;
+    // put the nodes into the structure
+    p->pMapInv  = ALLOC( unsigned short, 222 );
+    memset( p->pMapInv, 0, sizeof(unsigned short) * 222 );
+    p->vClasses = Vec_VecStart( 222 );
+    for ( i = 0; i < p->nFuncs; i++ )
+    {
+        if ( p->pTable[i] == NULL )
+            continue;
+        // consider all implementations of this function
+        for ( pNode = p->pTable[i]; pNode; pNode = pNode->pNext )
+        {
+            assert( pNode->uTruth == p->pTable[i]->uTruth );
+            assert( p->pMap[pNode->uTruth] >= 0 && p->pMap[pNode->uTruth] < 222 );
+            Vec_VecPush( p->vClasses, p->pMap[pNode->uTruth], pNode );
+            p->pMapInv[ p->pMap[pNode->uTruth] ] = p->puCanons[pNode->uTruth];
+        }
+    }
+    // compute decomposition forms for each node and verify them
+    Vec_VecForEachEntry( p->vClasses, pNode, i, k )
+    {
+        pGraph = Rwt_NodePreprocess( p, pNode );
+        pNode->pNext = (Rwt_Node_t *)pGraph;
+//        assert( pNode->uTruth == (Dec_GraphDeriveTruth(pGraph) & 0xFFFF) );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Preprocesses subgraphs rooted at this node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Graph_t * Rwt_NodePreprocess( Rwt_Man_t * p, Rwt_Node_t * pNode )
+{
+    Dec_Graph_t * pGraph;
+    Dec_Edge_t eRoot;
+    assert( !Rwt_IsComplement(pNode) );
+    // consider constant
+    if ( pNode->uTruth == 0 )
+        return Dec_GraphCreateConst0();
+    // consider the case of elementary var
+    if ( pNode->uTruth == 0x00FF )
+        return Dec_GraphCreateLeaf( 3, 4, 1 );
+    // start the subgraphs
+    pGraph = Dec_GraphCreate( 4 );
+    // collect the nodes
+    Rwt_ManIncTravId( p );
+    eRoot = Rwt_TravCollect_rec( p, pNode, pGraph );
+    Dec_GraphSetRoot( pGraph, eRoot );
+    return pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Dec_Edge_t Rwt_TravCollect_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, Dec_Graph_t * pGraph )
+{
+    Dec_Edge_t eNode0, eNode1, eNode;
+    // elementary variable
+    if ( pNode->fUsed )
+        return Dec_EdgeCreate( pNode->Id - 1, 0 );
+    // previously visited node
+    if ( pNode->TravId == p->nTravIds )
+        return Dec_IntToEdge( pNode->Volume );
+    pNode->TravId = p->nTravIds;
+    // solve for children
+    eNode0 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p0), pGraph );
+    if ( Rwt_IsComplement(pNode->p0) )    
+        eNode0.fCompl = !eNode0.fCompl;
+    eNode1 = Rwt_TravCollect_rec( p, Rwt_Regular(pNode->p1), pGraph );
+    if ( Rwt_IsComplement(pNode->p1) )    
+        eNode1.fCompl = !eNode1.fCompl;
+    // create the decomposition node(s)
+    if ( pNode->fExor )
+        eNode = Dec_GraphAddNodeXor( pGraph, eNode0, eNode1, 0 );
+    else
+        eNode = Dec_GraphAddNodeAnd( pGraph, eNode0, eNode1 );
+    // save the result
+    pNode->Volume = Dec_EdgeToInt( eNode );
+    return eNode;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/rwt/rwtMan.c b/abc70930/src/aig/rwt/rwtMan.c
new file mode 100644
index 00000000..869043a4
--- /dev/null
+++ b/abc70930/src/aig/rwt/rwtMan.c
@@ -0,0 +1,358 @@
+/**CFile****************************************************************
+
+  FileName    [rwtMan.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting package.]
+
+  Synopsis    [Rewriting manager.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: rwtMan.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "rwt.h"
+#include "deco.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+static unsigned short * s_puCanons = NULL; 
+static char *           s_pPhases = NULL; 
+static char *           s_pPerms = NULL; 
+static unsigned char *  s_pMap = NULL;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Starts residual rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManGlobalStart()
+{ 
+    if ( s_puCanons == NULL )
+        Extra_Truth4VarNPN( &s_puCanons, &s_pPhases, &s_pPerms, &s_pMap );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Starts residual rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManGlobalStop()
+{ 
+    FREE( s_puCanons );
+    FREE( s_pPhases );
+    FREE( s_pPerms );
+    FREE( s_pMap );
+} 
+
+/**Function*************************************************************
+
+  Synopsis    [Starts rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rwt_Man_t * Rwt_ManStart( int fPrecompute )
+{
+    Rwt_Man_t * p;
+    int clk = clock();
+clk = clock();
+    p = ALLOC( Rwt_Man_t, 1 );
+    memset( p, 0, sizeof(Rwt_Man_t) );
+    p->nFuncs = (1<<16);
+    // copy the global tables
+    Rwt_ManGlobalStart();
+    p->puCanons = s_puCanons; 
+    p->pPhases  = s_pPhases; 
+    p->pPerms   = s_pPerms; 
+    p->pMap     = s_pMap; 
+    // initialize practical NPN classes
+    p->pPractical  = Rwt_ManGetPractical( p );
+    // create the table
+    p->pTable = ALLOC( Rwt_Node_t *, p->nFuncs );
+    memset( p->pTable, 0, sizeof(Rwt_Node_t *) * p->nFuncs );
+    // create the elementary nodes
+    p->pMmNode  = Mem_FixedStart( sizeof(Rwt_Node_t) );
+    p->vForest  = Vec_PtrAlloc( 100 );
+    Rwt_ManAddVar( p, 0x0000, fPrecompute ); // constant 0
+    Rwt_ManAddVar( p, 0xAAAA, fPrecompute ); // var A
+    Rwt_ManAddVar( p, 0xCCCC, fPrecompute ); // var B
+    Rwt_ManAddVar( p, 0xF0F0, fPrecompute ); // var C
+    Rwt_ManAddVar( p, 0xFF00, fPrecompute ); // var D
+    p->nClasses = 5;
+    // other stuff
+    p->nTravIds   = 1;
+    p->pPerms4    = Extra_Permutations( 4 );
+    p->vLevNums   = Vec_IntAlloc( 50 );
+    p->vFanins    = Vec_PtrAlloc( 50 );
+    p->vFaninsCur = Vec_PtrAlloc( 50 );
+    p->vNodesTemp = Vec_PtrAlloc( 50 );
+    if ( fPrecompute )
+    {   // precompute subgraphs
+//        Rwt_ManPrecompute( p );
+//        Rwt_ManPrint( p );
+//        Rwt_ManWriteToArray( p );
+    }
+    else
+    {   // load saved subgraphs
+        Rwt_ManLoadFromArray( p, 0 );
+//        Rwt_ManPrint( p );
+        Rwt_ManPreprocess( p );
+    }
+p->timeStart = clock() - clk;
+    return p;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops rewriting manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManStop( Rwt_Man_t * p )
+{
+    if ( p->vClasses )
+    {
+        Rwt_Node_t * pNode;
+        int i, k;
+        Vec_VecForEachEntry( p->vClasses, pNode, i, k )
+            Dec_GraphFree( (Dec_Graph_t *)pNode->pNext );
+    }
+    if ( p->vClasses )  Vec_VecFree( p->vClasses );
+    Vec_PtrFree( p->vNodesTemp );
+    Vec_PtrFree( p->vForest );
+    Vec_IntFree( p->vLevNums );
+    Vec_PtrFree( p->vFanins );
+    Vec_PtrFree( p->vFaninsCur );
+    Mem_FixedStop( p->pMmNode, 0 );
+    FREE( p->pMapInv );
+    free( p->pTable );
+    free( p->pPractical );
+    free( p->pPerms4 );
+    free( p );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManPrintStats( Rwt_Man_t * p )
+{
+    int i, Counter = 0;
+    for ( i = 0; i < 222; i++ )
+        Counter += (p->nScores[i] > 0);
+
+    printf( "Rewriting statistics:\n" );
+    printf( "Total cuts tries  = %8d.\n", p->nCutsGood );
+    printf( "Bad cuts found    = %8d.\n", p->nCutsBad );
+    printf( "Total subgraphs   = %8d.\n", p->nSubgraphs );
+    printf( "Used NPN classes  = %8d.\n", Counter );
+    printf( "Nodes considered  = %8d.\n", p->nNodesConsidered );
+    printf( "Nodes rewritten   = %8d.\n", p->nNodesRewritten );
+    printf( "Calculated gain   = %8d.\n", p->nNodesGained     );
+    PRT( "Start       ", p->timeStart );
+    PRT( "Cuts        ", p->timeCut );
+    PRT( "Truth       ", p->timeTruth );
+    PRT( "Resynthesis ", p->timeRes );
+    PRT( "    Mffc    ", p->timeMffc );
+    PRT( "    Eval    ", p->timeEval );
+    PRT( "Update      ", p->timeUpdate );
+    PRT( "TOTAL       ", p->timeTotal );
+
+/*
+    printf( "The scores are:\n" );
+    for ( i = 0; i < 222; i++ )
+        if ( p->nScores[i] > 0 )
+        {
+            extern void Ivy_TruthDsdComputePrint( unsigned uTruth );
+            printf( "%3d = %8d  canon = %5d  ", i, p->nScores[i], p->pMapInv[i] );
+            Ivy_TruthDsdComputePrint( (unsigned)p->pMapInv[i] | ((unsigned)p->pMapInv[i] << 16) );
+        }
+    printf( "\n" );
+*/
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManPrintStatsFile( Rwt_Man_t * p )
+{
+    FILE * pTable;
+    pTable = fopen( "stats.txt", "a+" );
+    fprintf( pTable, "%d ", p->nCutsGood );
+    fprintf( pTable, "%d ", p->nSubgraphs );
+    fprintf( pTable, "%d ", p->nNodesRewritten );
+    fprintf( pTable, "%d", p->nNodesGained );
+    fprintf( pTable, "\n" );
+    fclose( pTable );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void * Rwt_ManReadDecs( Rwt_Man_t * p )
+{
+    return p->pGraph;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Vec_Ptr_t * Rwt_ManReadLeaves( Rwt_Man_t * p )
+{
+    return p->vFanins;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rwt_ManReadCompl( Rwt_Man_t * p )
+{
+    return p->fCompl;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManAddTimeCuts( Rwt_Man_t * p, int Time )
+{
+    p->timeCut += Time;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManAddTimeUpdate( Rwt_Man_t * p, int Time )
+{
+    p->timeUpdate += Time;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Stops the resynthesis manager.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManAddTimeTotal( Rwt_Man_t * p, int Time )
+{
+    p->timeTotal += Time;
+}
+
+
+/**Function*************************************************************
+
+  Synopsis    [Precomputes AIG subgraphs.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_Precompute()
+{
+    Rwt_Man_t * p;
+    p = Rwt_ManStart( 1 );
+    Rwt_ManStop( p );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
diff --git a/abc70930/src/aig/rwt/rwtUtil.c b/abc70930/src/aig/rwt/rwtUtil.c
new file mode 100644
index 00000000..af3e1893
--- /dev/null
+++ b/abc70930/src/aig/rwt/rwtUtil.c
@@ -0,0 +1,665 @@
+/**CFile****************************************************************
+
+  FileName    [rwtUtil.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [DAG-aware AIG rewriting package.]
+
+  Synopsis    [Various utilities.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: rwtUtil.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "rwt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+// precomputed data
+#ifdef _WIN32
+unsigned short s_RwtPracticalClasses[];
+unsigned short s_RwtAigSubgraphs[];
+#else
+static unsigned short s_RwtPracticalClasses[];
+static unsigned short s_RwtAigSubgraphs[];
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Adds the node to the end of the list.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ListAddToTail( Rwt_Node_t ** ppList, Rwt_Node_t * pNode )
+{
+    Rwt_Node_t * pTemp;
+    // find the last one
+    for ( pTemp = *ppList; pTemp; pTemp = pTemp->pNext )
+        ppList = &pTemp->pNext;
+    // attach at the end
+    *ppList = pNode;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rwt_Node_t * Rwt_ManAddVar( Rwt_Man_t * p, unsigned uTruth, int fPrecompute )
+{
+    Rwt_Node_t * pNew;
+    pNew = (Rwt_Node_t *)Mem_FixedEntryFetch( p->pMmNode );
+    pNew->Id     = p->vForest->nSize;
+    pNew->TravId = 0;
+    pNew->uTruth = uTruth;
+    pNew->Level  = 0;
+    pNew->Volume = 0;
+    pNew->fUsed  = 1;
+    pNew->fExor  = 0;
+    pNew->p0     = NULL;
+    pNew->p1     = NULL;    
+    pNew->pNext  = NULL;
+    Vec_PtrPush( p->vForest, pNew );
+    if ( fPrecompute )
+        Rwt_ListAddToTail( p->pTable + uTruth, pNew );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+Rwt_Node_t * Rwt_ManAddNode( Rwt_Man_t * p, Rwt_Node_t * p0, Rwt_Node_t * p1, int fExor, int Level, int Volume )
+{
+    Rwt_Node_t * pNew;
+    unsigned uTruth;
+    // compute truth table, leve, volume
+    p->nConsidered++;
+    if ( fExor )
+        uTruth = (p0->uTruth ^ p1->uTruth);
+    else
+        uTruth = (Rwt_IsComplement(p0)? ~Rwt_Regular(p0)->uTruth : Rwt_Regular(p0)->uTruth) & 
+                 (Rwt_IsComplement(p1)? ~Rwt_Regular(p1)->uTruth : Rwt_Regular(p1)->uTruth) & 0xFFFF;
+    // create the new node
+    pNew = (Rwt_Node_t *)Mem_FixedEntryFetch( p->pMmNode );
+    pNew->Id     = p->vForest->nSize;
+    pNew->TravId = 0;
+    pNew->uTruth = uTruth;
+    pNew->Level  = Level;
+    pNew->Volume = Volume;
+    pNew->fUsed  = 0;
+    pNew->fExor  = fExor;
+    pNew->p0     = p0;
+    pNew->p1     = p1;
+    pNew->pNext  = NULL;
+    Vec_PtrPush( p->vForest, pNew );
+    // do not add if the node is not essential
+    if ( uTruth != p->puCanons[uTruth] )
+        return pNew;
+
+    // add to the list
+    p->nAdded++;
+    if ( p->pTable[uTruth] == NULL )
+        p->nClasses++;
+    Rwt_ListAddToTail( p->pTable + uTruth, pNew );
+    return pNew;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_Trav_rec( Rwt_Man_t * p, Rwt_Node_t * pNode, int * pVolume )
+{
+    if ( pNode->fUsed || pNode->TravId == p->nTravIds )
+        return;
+    pNode->TravId = p->nTravIds;
+    (*pVolume)++;
+    if ( pNode->fExor )
+        (*pVolume)++;
+    Rwt_Trav_rec( p, Rwt_Regular(pNode->p0), pVolume );
+    Rwt_Trav_rec( p, Rwt_Regular(pNode->p1), pVolume );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManIncTravId( Rwt_Man_t * p )
+{
+    Rwt_Node_t * pNode;
+    int i;
+    if ( p->nTravIds++ < 0x8FFFFFFF )
+        return;
+    Vec_PtrForEachEntry( p->vForest, pNode, i )
+        pNode->TravId = 0;
+    p->nTravIds = 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Adds one node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Rwt_ManNodeVolume( Rwt_Man_t * p, Rwt_Node_t * p0, Rwt_Node_t * p1 )
+{
+    int Volume = 0;
+    Rwt_ManIncTravId( p );
+    Rwt_Trav_rec( p, p0, &Volume );
+    Rwt_Trav_rec( p, p1, &Volume );
+    return Volume;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Loads data.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Rwt_ManLoadFromArray( Rwt_Man_t * p, int fVerbose )
+{
+    unsigned short * pArray = s_RwtAigSubgraphs;
+    Rwt_Node_t * p0, * p1;
+    unsigned Entry0, Entry1;
+    int Level, Volume, nEntries, fExor;
+    int i, clk = clock();
+
+    // reconstruct the forest
+    for ( i = 0; ; i++ )
+    {
+        Entry0 = pArray[2*i + 0];
+        Entry1 = pArray[2*i + 1];
+        if ( Entry0 == 0 && Entry1 == 0 )
+            break;
+        // get EXOR flag
+        fExor = (Entry0 & 1);
+        Entry0 >>= 1;
+        // get the nodes
+        p0 = p->vForest->pArray[Entry0 >> 1];
+        p1 = p->vForest->pArray[Entry1 >> 1];
+        // compute the level and volume of the new nodes
+        Level  = 1 + RWT_MAX( p0->Level, p1->Level );
+        Volume = 1 + Rwt_ManNodeVolume( p, p0, p1 );
+        // set the complemented attributes
+        p0 = Rwt_NotCond( p0, (Entry0 & 1) );
+        p1 = Rwt_NotCond( p1, (Entry1 & 1) );
+        // add the node
+//        Rwt_ManTryNode( p, p0, p1, Level, Volume );
+        Rwt_ManAddNode( p, p0, p1, fExor, Level, Volume + fExor );
+    }
+    nEntries = i - 1;
+    if ( fVerbose )
+    {
+        printf( "The number of classes = %d. Canonical nodes = %d.\n", p->nClasses, p->nAdded );
+        printf( "The number of nodes loaded = %d.  ", nEntries );  PRT( "Loading", clock() - clk );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Create practical classes.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+char * Rwt_ManGetPractical( Rwt_Man_t * p )
+{
+    char * pPractical;
+    int i;
+    pPractical = ALLOC( char, p->nFuncs );
+    memset( pPractical, 0, sizeof(char) * p->nFuncs );
+    pPractical[0] = 1;
+    for ( i = 1; ; i++ )
+    {
+        if ( s_RwtPracticalClasses[i] == 0 )
+            break;
+        pPractical[ s_RwtPracticalClasses[i] ] = 1;
+    }
+    return pPractical;
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+// the following 135 practical NPN classes of 4-variable functions were computed
+// by considering all 4-input cuts appearing in IWLS, MCNC, and ISCAS benchmarks
+static unsigned short s_RwtPracticalClasses[] = 
+{
+    0x0000, 0x0001, 0x0003, 0x0006, 0x0007, 0x000f, 0x0016, 0x0017, 0x0018, 0x0019, 0x001b, 
+    0x001e, 0x001f, 0x003c, 0x003d, 0x003f, 0x0069, 0x006b, 0x006f, 0x007e, 0x007f, 0x00ff, 
+    0x0116, 0x0118, 0x0119, 0x011a, 0x011b, 0x011e, 0x011f, 0x012c, 0x012d, 0x012f, 0x013c, 
+    0x013d, 0x013e, 0x013f, 0x0168, 0x0169, 0x016f, 0x017f, 0x0180, 0x0181, 0x0182, 0x0183, 
+    0x0186, 0x0189, 0x018b, 0x018f, 0x0198, 0x0199, 0x019b, 0x01a8, 0x01a9, 0x01aa, 0x01ab, 
+    0x01ac, 0x01ad, 0x01ae, 0x01af, 0x01bf, 0x01e9, 0x01ea, 0x01eb, 0x01ee, 0x01ef, 0x01fe, 
+    0x033c, 0x033d, 0x033f, 0x0356, 0x0357, 0x0358, 0x0359, 0x035a, 0x035b, 0x035f, 0x0368, 
+    0x0369, 0x036c, 0x036e, 0x037d, 0x03c0, 0x03c1, 0x03c3, 0x03c7, 0x03cf, 0x03d4, 0x03d5, 
+    0x03d7, 0x03d8, 0x03d9, 0x03dc, 0x03dd, 0x03de, 0x03fc, 0x0660, 0x0661, 0x0666, 0x0669, 
+    0x066f, 0x0676, 0x067e, 0x0690, 0x0696, 0x0697, 0x069f, 0x06b1, 0x06b6, 0x06f0, 0x06f2, 
+    0x06f6, 0x06f9, 0x0776, 0x0778, 0x07b0, 0x07b1, 0x07b4, 0x07bc, 0x07f0, 0x07f2, 0x07f8, 
+    0x0ff0, 0x1683, 0x1696, 0x1698, 0x169e, 0x16e9, 0x178e, 0x17e8, 0x18e7, 0x19e6, 0x1be4, 
+    0x1ee1, 0x3cc3, 0x6996, 0x0000
+};
+
+static unsigned short s_RwtAigSubgraphs[] = 
+{
+    0x0008,0x0002, 0x000a,0x0002, 0x0008,0x0003, 0x000a,0x0003, 0x0009,0x0002, 
+    0x000c,0x0002, 0x000e,0x0002, 0x000c,0x0003, 0x000e,0x0003, 0x000d,0x0002, 
+    0x000c,0x0004, 0x000e,0x0004, 0x000c,0x0005, 0x000e,0x0005, 0x000d,0x0004, 
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+    0x023a,0x0009, 0x023d,0x003a, 0x0245,0x0044, 0x0249,0x003a, 0x024e,0x009e, 
+    0x024e,0x0106, 0x0251,0x0026, 0x0258,0x0013, 0x0259,0x0024, 0x0258,0x0061, 
+    0x0259,0x0086, 0x0258,0x00c7, 0x0258,0x00df, 0x0259,0x00ec, 0x0258,0x00fc, 
+    0x025d,0x0024, 0x025d,0x00de, 0x0260,0x00f6, 0x0268,0x0009, 0x0269,0x0044, 
+    0x0268,0x00f3, 0x0268,0x00f9, 0x026d,0x003a, 0x0270,0x0068, 0x0275,0x003a, 
+    0x027a,0x0044, 0x0279,0x0044, 0x027e,0x007e, 0x0281,0x0044, 0x0285,0x0008, 
+    0x028d,0x0006, 0x028d,0x00d2, 0x0295,0x00cc, 0x0296,0x00f6, 0x0295,0x00f8, 
+    0x0299,0x0030, 0x029e,0x007e, 0x029d,0x0080, 0x02a6,0x008f, 0x02a6,0x0095, 
+    0x02aa,0x0029, 0x02aa,0x0030, 0x02b5,0x0008, 0x02b9,0x003a, 0x02bd,0x0004, 
+    0x02bd,0x00fc, 0x02c2,0x00b2, 0x02c1,0x00b4, 0x02c4,0x0029, 0x02c8,0x0029, 
+    0x02c8,0x0033, 0x02ca,0x003d, 0x02ce,0x0029, 0x02ce,0x0030, 0x02d2,0x0068, 
+    0x02d1,0x006a, 0x02d5,0x006a, 0x02d9,0x0008, 0x02de,0x012c, 0x02e2,0x012c, 
+    0x02e4,0x0009, 0x02e5,0x002a, 0x02e5,0x0056, 0x02e5,0x012c, 0x02ea,0x0029, 
+    0x02ea,0x0030, 0x02e9,0x0030, 0x02ec,0x0029, 0x02ec,0x0030, 0x02ee,0x012c, 
+    0x02f1,0x0068, 0x02f1,0x00b2, 0x02f1,0x0108, 0x02f1,0x012c, 0x02f6,0x0013, 
+    0x02f6,0x0015, 0x02f6,0x001f, 0x02f6,0x0030, 0x02f6,0x0065, 0x02f6,0x0067, 
+    0x02f6,0x009f, 0x02f6,0x00b6, 0x02f6,0x00b9, 0x02f6,0x00c0, 0x02f6,0x00cf, 
+    0x02f6,0x0107, 0x02f6,0x010b, 0x02f6,0x010f, 0x02f6,0x0115, 0x02f6,0x012d, 
+    0x02f6,0x0134, 0x02f6,0x0153, 0x02f6,0x0171, 0x02f6,0x0176, 0x02f8,0x0003, 
+    0x02fa,0x017b, 0x02fc,0x00ba, 0x02fc,0x00d3, 0x0302,0x0013, 0x0302,0x001f, 
+    0x0302,0x0030, 0x0302,0x005d, 0x0302,0x0065, 0x0302,0x0067, 0x0302,0x0099, 
+    0x0302,0x009f, 0x0302,0x00ad, 0x0302,0x00b9, 0x0302,0x00c0, 0x0302,0x00cf, 
+    0x0301,0x00d2, 0x0301,0x00fe, 0x0302,0x0107, 0x0302,0x010b, 0x0302,0x010f, 
+    0x0302,0x0117, 0x0302,0x0134, 0x0302,0x0153, 0x0302,0x0157, 0x0302,0x0176, 
+    0x0306,0x0029, 0x0308,0x00b2, 0x0309,0x00dc, 0x030d,0x00f8, 0x0312,0x00f3, 
+    0x0318,0x007e, 0x031d,0x0080, 0x0321,0x0008, 0x0321,0x0094, 0x0326,0x017b, 
+    0x0326,0x0181, 0x0329,0x012e, 0x032a,0x017b, 0x032a,0x0181, 0x032e,0x008f, 
+    0x032e,0x0095, 0x032e,0x00f3, 0x032e,0x00f9, 0x0332,0x0009, 0x0331,0x0008, 
+    0x0330,0x003d, 0x0330,0x0044, 0x0330,0x0053, 0x0332,0x008f, 0x0332,0x0095, 
+    0x0330,0x00b1, 0x0332,0x00f3, 0x0332,0x00f9, 0x0330,0x0127, 0x0332,0x017b, 
+    0x0332,0x0181, 0x033c,0x0013, 0x033c,0x001c, 0x033d,0x0086, 0x033d,0x00ec, 
+    0x033d,0x0172, 0x033e,0x019d, 0x0345,0x0002, 0x0344,0x008f, 0x0344,0x00f3, 
+    0x034d,0x0030, 0x0352,0x0033, 0x0354,0x0029, 0x0354,0x0030, 0x035a,0x0009, 
+    0x035a,0x017b, 0x035a,0x019b, 0x035a,0x01a2, 0x035e,0x0181, 0x0360,0x0009, 
+    0x0366,0x0009, 0x0364,0x0029, 0x0364,0x0030, 0x0364,0x0033, 0x0364,0x003a, 
+    0x0364,0x003d, 0x0364,0x0044, 0x0369,0x0030, 0x0370,0x0029, 0x0370,0x0030, 
+    0x0376,0x0033, 0x037a,0x0009, 0x037a,0x019b, 0x037a,0x01a2, 0x037c,0x0009, 
+    0x0382,0x0181, 0x0386,0x0009, 0x0384,0x0029, 0x0384,0x0030, 0x0384,0x0033, 
+    0x0384,0x003a, 0x0384,0x003d, 0x0384,0x0044, 0x038a,0x0044, 0x038a,0x009e, 
+    0x038a,0x0106, 0x038a,0x0198, 0x038d,0x010e, 0x038d,0x0152, 0x038d,0x0158, 
+    0x0392,0x009e, 0x0392,0x0106, 0x0392,0x0198, 0x0395,0x0086, 0x0395,0x009a, 
+    0x0395,0x00ec, 0x0395,0x0172, 0x0398,0x014e, 0x0398,0x0175, 0x0398,0x018d, 
+    0x039c,0x0023, 0x039c,0x0027, 0x039c,0x00ef, 0x039c,0x0139, 0x039c,0x0168, 
+    0x03a0,0x0019, 0x03a0,0x001d, 0x03a0,0x0023, 0x03a0,0x0027, 0x03a1,0x004e, 
+    0x03a4,0x0162, 0x03a4,0x0183, 0x03a8,0x0013, 0x03a8,0x0027, 0x03a8,0x0133, 
+    0x03a8,0x0148, 0x03a8,0x0181, 0x03ac,0x0013, 0x03ac,0x0027, 0x03b0,0x017b, 
+    0x03b0,0x0181, 0x03b4,0x004b, 0x03b4,0x00e0, 0x03b4,0x00fb, 0x03b8,0x000f, 
+    0x03b8,0x0013, 0x03b8,0x00ab, 0x03b8,0x00bf, 0x03b8,0x00d0, 0x03bd,0x00da, 
+    0x03bd,0x012c, 0x03c8,0x000f, 0x03c8,0x0013, 0x03c8,0x0019, 0x03c8,0x001d, 
+    0x03cd,0x0086, 0x03cd,0x00ec, 0x03cd,0x0172, 0x03d2,0x00e0, 0x03d2,0x00ef, 
+    0x03d2,0x0112, 0x03d2,0x0139, 0x03d2,0x0168, 0x03d6,0x017b, 0x03d6,0x0181, 
+    0x03da,0x0133, 0x03da,0x0148, 0x03e2,0x0023, 0x03e2,0x0027, 0x03e6,0x0027, 
+    0x03e6,0x0181, 0x03ee,0x017b, 0x03ee,0x0181, 0x03fe,0x003d, 0x0401,0x012a, 
+    0x0401,0x019e, 0x0405,0x01a0, 0x040a,0x000d, 0x040a,0x011f, 0x040a,0x016f, 
+    0x040d,0x012a, 0x0412,0x017b, 0x041a,0x0033, 0x041a,0x003d, 0x041a,0x0181, 
+    0x0421,0x0086, 0x0421,0x009a, 0x0421,0x00ec, 0x0421,0x0172, 0x042e,0x0205, 
+    0x043a,0x0205, 0x043e,0x017b, 0x0442,0x01f5, 0x044c,0x0007, 0x0452,0x0033, 
+    0x0452,0x01ce, 0x0452,0x01d0, 0x0452,0x01f1, 0x0452,0x01fb, 0x0452,0x0225, 
+    0x0454,0x0005, 0x045a,0x0033, 0x045a,0x0181, 0x045a,0x01ce, 0x045a,0x01d0, 
+    0x045a,0x01f1, 0x0469,0x01de, 0x046e,0x0181, 0x047a,0x01ce, 0x047a,0x01f1, 
+    0x0485,0x012c, 0x0489,0x012c, 0x0490,0x01d8, 0x0496,0x0033, 0x0496,0x003d, 
+    0x0498,0x008f, 0x0498,0x00f3, 0x049e,0x0044, 0x049e,0x0221, 0x04a1,0x0006, 
+    0x04a2,0x0044, 0x04a6,0x0221, 0x04a9,0x0004, 0x04ac,0x0027, 0x04b1,0x009a, 
+    0x04b6,0x0097, 0x04b8,0x0027, 0x04c6,0x0219, 0x04ca,0x017b, 0x04cc,0x004b, 
+    0x04d0,0x00ab, 0x04d6,0x017b, 0x04d8,0x000f, 0x04d8,0x0019, 0x04d8,0x0033, 
+    0x04d8,0x003d, 0x04de,0x003d, 0x04de,0x0103, 0x04de,0x018b, 0x04de,0x0231, 
+    0x04e2,0x0044, 0x04e2,0x009e, 0x04e2,0x0106, 0x04e2,0x0198, 0x04e5,0x01a4, 
+    0x04e5,0x01b6, 0x04ea,0x009e, 0x04ea,0x0106, 0x04ea,0x0198, 0x04ed,0x002e, 
+    0x04ed,0x0038, 0x04ed,0x00a2, 0x04f1,0x0086, 0x04f1,0x009a, 0x04f1,0x00ec, 
+    0x04f1,0x0172, 0x04f9,0x004e, 0x04f8,0x0229, 0x04f8,0x022d, 0x0500,0x023e, 
+    0x0504,0x0217, 0x0510,0x00f3, 0x0514,0x0043, 0x0514,0x004d, 0x0514,0x00c3, 
+    0x0514,0x013d, 0x0514,0x0215, 0x0514,0x0232, 0x0515,0x0260, 0x0519,0x002a, 
+    0x0518,0x0030, 0x0518,0x0067, 0x0518,0x00c9, 0x0518,0x01eb, 0x0518,0x01ef, 
+    0x051c,0x0139, 0x051c,0x0168, 0x0520,0x0027, 0x0526,0x014e, 0x0526,0x0175, 
+    0x0526,0x018d, 0x052d,0x0200, 0x0532,0x0021, 0x0532,0x00bf, 0x0532,0x00d0, 
+    0x0532,0x0239, 0x0532,0x0266, 0x053d,0x0024, 0x053d,0x00da, 0x054a,0x000f, 
+    0x054a,0x00ab, 0x054a,0x023a, 0x054e,0x0043, 0x054e,0x004d, 0x054e,0x00c3, 
+    0x054e,0x013d, 0x054e,0x0215, 0x054e,0x0232, 0x054e,0x029d, 0x0552,0x014e, 
+    0x0552,0x018d, 0x0556,0x00f3, 0x0556,0x01e4, 0x055a,0x0299, 0x055d,0x0086, 
+    0x055d,0x009a, 0x055d,0x00ec, 0x055d,0x0172, 0x0566,0x01dc, 0x0566,0x02a5, 
+    0x056d,0x020a, 0x057a,0x003d, 0x057a,0x01d4, 0x057a,0x01f3, 0x0579,0x025e, 
+    0x057e,0x0139, 0x057e,0x0168, 0x0581,0x0006, 0x0586,0x017b, 0x0586,0x0181, 
+    0x0586,0x028c, 0x0588,0x0007, 0x058e,0x0033, 0x058e,0x008f, 0x058e,0x01d0, 
+    0x058e,0x027c, 0x0590,0x0003, 0x0596,0x0033, 0x0596,0x008f, 0x0596,0x0095, 
+    0x0596,0x01d0, 0x0596,0x027c, 0x05a2,0x026f, 0x05a5,0x0284, 0x05aa,0x017b, 
+    0x05ac,0x0205, 0x05b2,0x008f, 0x05b6,0x017b, 0x05b8,0x01da, 0x05c1,0x0276, 
+    0x05c6,0x0248, 0x05c8,0x0247, 0x05c8,0x027e, 0x05cc,0x003d, 0x05cc,0x01d4, 
+    0x05cc,0x01f3, 0x05d0,0x014e, 0x05d0,0x018d, 0x05da,0x00f9, 0x05dd,0x0006, 
+    0x05de,0x0044, 0x05e5,0x002e, 0x05e6,0x02f1, 0x05ea,0x01d4, 0x05ea,0x01f3, 
+    0x05ea,0x022d, 0x05ed,0x0002, 0x05f6,0x0027, 0x05fa,0x0097, 0x05fc,0x003d, 
+    0x0602,0x003d, 0x0606,0x00f3, 0x060a,0x0027, 0x060e,0x003d, 0x060e,0x0103, 
+    0x060e,0x018b, 0x060e,0x0231, 0x060e,0x02d1, 0x0611,0x01fc, 0x0611,0x0234, 
+    0x061a,0x0287, 0x061d,0x0214, 0x0621,0x01d4, 0x062a,0x0027, 0x062a,0x022d, 
+    0x062e,0x009e, 0x062e,0x0106, 0x062e,0x0198, 0x0632,0x009e, 0x0632,0x0106, 
+    0x0632,0x0198, 0x0639,0x0042, 0x0639,0x00b2, 0x0639,0x0108, 0x063d,0x01f8, 
+    0x0641,0x0086, 0x0641,0x009a, 0x0641,0x00ec, 0x0641,0x0172, 0x0645,0x0044, 
+    0x0649,0x0042, 0x0648,0x0087, 0x0648,0x00ed, 0x0648,0x0173, 0x0649,0x01a0, 
+    0x0648,0x0241, 0x0648,0x026f, 0x0648,0x02df, 0x0648,0x0307, 0x064c,0x023a, 
+    0x064c,0x02b3, 0x0651,0x0062, 0x0650,0x0217, 0x0651,0x02ac, 0x0650,0x02d6, 
+    0x0655,0x0042, 0x065d,0x0042, 0x0664,0x02b1, 0x0664,0x02ce, 0x0669,0x0238, 
+    0x066d,0x002a, 0x066c,0x0039, 0x066d,0x01f6, 0x066c,0x0213, 0x066c,0x022e, 
+    0x066d,0x02a2, 0x066c,0x02e1, 0x0671,0x002a, 0x0670,0x0030, 0x0670,0x0067, 
+    0x0670,0x00c9, 0x0670,0x01eb, 0x0670,0x01ef, 0x0670,0x02c3, 0x0675,0x0020, 
+    0x0678,0x0133, 0x0678,0x0148, 0x067c,0x0027, 0x0681,0x023a, 0x0684,0x0021, 
+    0x0684,0x00bf, 0x0684,0x00d0, 0x0689,0x01fc, 0x068e,0x0162, 0x068e,0x0183, 
+    0x0691,0x0200, 0x0696,0x0023, 0x0696,0x00e0, 0x0696,0x00fb, 0x0696,0x0268, 
+    0x069a,0x0282, 0x069d,0x007e, 0x06a2,0x004b, 0x06a2,0x023e, 0x06a2,0x02dc, 
+    0x06a6,0x0097, 0x06aa,0x02b1, 0x06aa,0x02ce, 0x06ae,0x0039, 0x06ae,0x0213, 
+    0x06ae,0x022e, 0x06ae,0x02e1, 0x06b2,0x0162, 0x06b2,0x0183, 0x06b6,0x0023, 
+    0x06b6,0x00e0, 0x06b6,0x00fb, 0x06ba,0x008f, 0x06ba,0x01e4, 0x06be,0x034b, 
+    0x06c1,0x0086, 0x06c1,0x009a, 0x06c1,0x00ec, 0x06c1,0x0172, 0x06c6,0x01da, 
+    0x06c6,0x0280, 0x06c6,0x0351, 0x06ce,0x008f, 0x06d2,0x01e3, 0x06d2,0x0287, 
+    0x06d2,0x0353, 0x06d6,0x027a, 0x06d6,0x029b, 0x06da,0x0033, 0x06da,0x01ce, 
+    0x06da,0x01f1, 0x06de,0x0133, 0x06de,0x0148, 0x06e2,0x0021, 0x06e2,0x00bf, 
+    0x06e2,0x00d0, 0x06e5,0x023a, 0x06e9,0x0004, 0x06ee,0x028c, 0x06ee,0x0338, 
+    0x06f2,0x0328, 0x06f2,0x0330, 0x06f4,0x0005, 0x06f9,0x01e0, 0x06fe,0x0328, 
+    0x06fe,0x0330, 0x0702,0x003d, 0x0702,0x00f3, 0x0702,0x0330, 0x0704,0x0003, 
+    0x070a,0x003d, 0x070a,0x00f3, 0x070a,0x01d4, 0x070a,0x01f3, 0x070a,0x0330, 
+    0x0711,0x032a, 0x0711,0x032e, 0x0716,0x003d, 0x0718,0x0205, 0x0718,0x0282, 
+    0x071e,0x00f3, 0x0720,0x01dc, 0x0720,0x02a5, 0x0726,0x0324, 0x072a,0x028a, 
+    0x072a,0x02a7, 0x0729,0x031c, 0x0729,0x032a, 0x072e,0x003d, 0x072e,0x00f9, 
+    0x072e,0x022d, 0x072e,0x0248, 0x072e,0x02e4, 0x0730,0x003d, 0x0730,0x0247, 
+    0x0730,0x02e3, 0x0730,0x0324, 0x0732,0x0324, 0x0739,0x032e, 0x073e,0x003d, 
+    0x0740,0x003d, 0x0744,0x027a, 0x0744,0x029b, 0x0748,0x0033, 0x0748,0x01ce, 
+    0x0748,0x01f1, 0x074c,0x0162, 0x074c,0x0183, 0x0750,0x0023, 0x0750,0x00e0, 
+    0x0750,0x00fb, 0x0755,0x0246, 0x075a,0x0095, 0x075a,0x0397, 0x075d,0x0004, 
+    0x076a,0x03b3, 0x076d,0x0002, 0x0772,0x02fb, 0x0772,0x0301, 0x0772,0x0315, 
+    0x0772,0x0397, 0x0776,0x008f, 0x077e,0x0027, 0x078a,0x00a1, 0x0792,0x009d, 
+    0x0792,0x00c3, 0x0792,0x02fb, 0x0792,0x0301, 0x0792,0x0315, 0x0792,0x03bd, 
+    0x0796,0x0027, 0x0796,0x024f, 0x079e,0x009d, 0x07a6,0x009d, 0x07a6,0x02fb, 
+    0x07a6,0x0301, 0x07a6,0x0315, 0x07a6,0x03bd, 0x07aa,0x0027, 0x07aa,0x024f, 
+    0x07ae,0x009d, 0x07b9,0x004e, 0x07b8,0x0087, 0x07b8,0x00ed, 0x07b8,0x0173, 
+    0x07b8,0x0197, 0x07b9,0x021a, 0x07b9,0x02b8, 0x07b9,0x0364, 0x07be,0x0029, 
+    0x07be,0x0030, 0x07c0,0x017b, 0x07c6,0x017b, 0x07c8,0x00f3, 0x07ce,0x00f3, 
+    0x07d0,0x008f, 0x07d6,0x008f, 0x07d9,0x01e8, 0x07dd,0x0292, 0x07e2,0x0053, 
+    0x07e6,0x008f, 0x07e6,0x00f3, 0x07e6,0x017b, 0x07e8,0x0029, 0x07e8,0x0030, 
+    0x07ec,0x0021, 0x07ec,0x02ad, 0x07f2,0x0181, 0x07f2,0x0315, 0x07f4,0x0021, 
+    0x07f8,0x020f, 0x07fd,0x002e, 0x0800,0x008f, 0x0805,0x0006, 0x0809,0x03c2, 
+    0x080d,0x0084, 0x0812,0x0009, 0x0811,0x0008, 0x0812,0x00f3, 0x0812,0x00f9, 
+    0x0812,0x017b, 0x0812,0x0181, 0x0814,0x0033, 0x0818,0x0023, 0x081c,0x0285, 
+    0x0826,0x03bd, 0x082c,0x008f, 0x082c,0x017b, 0x0832,0x0043, 0x0832,0x011b, 
+    0x0832,0x01b3, 0x0832,0x01c3, 0x0835,0x032a, 0x0838,0x0085, 0x0839,0x032a, 
+    0x083e,0x0049, 0x083d,0x0084, 0x083e,0x02fb, 0x083e,0x0301, 0x083e,0x0315, 
+    0x083e,0x0397, 0x0842,0x0009, 0x0841,0x0008, 0x0844,0x0009, 0x0846,0x008f, 
+    0x084a,0x0033, 0x084e,0x0285, 0x0851,0x009a, 0x0856,0x00a1, 0x0859,0x031c, 
+    0x085d,0x00b2, 0x0861,0x0012, 0x0861,0x02cc, 0x0865,0x0058, 0x0865,0x007e, 
+    0x0869,0x004a, 0x0871,0x0010, 0x0876,0x003d, 0x0879,0x032c, 0x087e,0x0089, 
+    0x0882,0x0229, 0x0882,0x022d, 0x0882,0x02c7, 0x0882,0x02cb, 0x0886,0x0021, 
+    0x0886,0x02ad, 0x0885,0x0356, 0x088a,0x0017, 0x088a,0x020f, 0x0889,0x0354, 
+    0x088d,0x009c, 0x0892,0x0089, 0x0895,0x0246, 0x089a,0x03bd, 0x089e,0x008f, 
+    0x089e,0x02f9, 0x089e,0x0313, 0x08a1,0x032a, 0x08a6,0x0053, 0x08a6,0x0095, 
+    0x08a6,0x0397, 0x08a8,0x017b, 0x08ad,0x031a, 0x08b2,0x017b, 0x08b4,0x00f3, 
+    0x08b5,0x02a0, 0x08b8,0x0089, 0x08c1,0x0024, 0x08c4,0x00f3, 0x08c9,0x007e, 
+    0x08cd,0x007c, 0x08cd,0x0222, 0x08cd,0x0294, 0x08d1,0x003a, 0x08d6,0x0009, 
+    0x08d9,0x003a, 0x08dc,0x001f, 0x08e0,0x008f, 0x08e0,0x017b, 0x08e4,0x0009, 
+    0x08e8,0x01ed, 0x08ed,0x031c, 0x08f2,0x003d, 0x08f6,0x008f, 0x08f6,0x017b, 
+    0x08fa,0x0009, 0x08fe,0x003d, 0x0902,0x01e9, 0x0904,0x01e9, 0x0904,0x0381, 
+    0x090a,0x03b1, 0x090d,0x031a, 0x0910,0x0299, 0x0914,0x034b, 0x0919,0x0008, 
+    0x091c,0x0033, 0x091c,0x003d, 0x0920,0x0027, 0x0924,0x0027, 0x0924,0x01fb, 
+    0x092a,0x01ce, 0x092a,0x01f1, 0x092d,0x031c, 0x0930,0x001f, 0x0936,0x00c5, 
+    0x0938,0x00c5, 0x0938,0x0381, 0x093c,0x001b, 0x0942,0x017d, 0x094a,0x0027, 
+    0x094e,0x0027, 0x094e,0x01fb, 0x0952,0x03b1, 0x095a,0x0029, 0x095a,0x0030, 
+    0x095d,0x0030, 0x0961,0x0030, 0x0966,0x02f9, 0x0966,0x0313, 0x0968,0x02eb, 
+    0x096d,0x0008, 0x0970,0x017b, 0x0974,0x0033, 0x0979,0x0150, 0x097d,0x009a, 
+    0x0982,0x0293, 0x0984,0x0293, 0x0984,0x0379, 0x098a,0x02eb, 0x098e,0x0009, 
+    0x0992,0x003d, 0x0996,0x003d, 0x0999,0x0062, 0x099e,0x003d, 0x09a0,0x0027, 
+    0x09a5,0x0144, 0x09a8,0x02b5, 0x09ae,0x008f, 0x09ae,0x009d, 0x09b2,0x004d, 
+    0x09b2,0x0053, 0x09b2,0x00c3, 0x09b2,0x013d, 0x09b2,0x01c5, 0x09b2,0x0271, 
+    0x09b4,0x0025, 0x09ba,0x0033, 0x09ba,0x0079, 0x09bc,0x0015, 0x09c2,0x013f, 
+    0x09c4,0x013f, 0x09c4,0x0379, 0x09ca,0x02b5, 0x09cd,0x0006, 0x09da,0x0009, 
+    0x09d9,0x0008, 0x09dc,0x000b, 0x09dc,0x004f, 0x09dd,0x0086, 0x09e0,0x0009, 
+    0x09e6,0x00a1, 0x09e8,0x0009, 0x09ed,0x0086, 0x09f2,0x001f, 0x09f2,0x002f, 
+    0x09f2,0x0049, 0x09f2,0x006f, 0x09f2,0x0085, 0x09f2,0x0091, 0x09f2,0x00a9, 
+    0x09f2,0x00d3, 0x09f2,0x00d7, 0x09f2,0x011d, 0x09f2,0x0121, 0x09f2,0x0235, 
+    0x09f2,0x0393, 0x09f6,0x0324, 0x09f8,0x0049, 0x09f8,0x00a9, 0x09f8,0x011d, 
+    0x09fe,0x001f, 0x09fe,0x0029, 0x09fe,0x0033, 0x09fe,0x003d, 0x09fe,0x0085, 
+    0x09fe,0x008f, 0x09fe,0x00d3, 0x0a00,0x003d, 0x0a06,0x012d, 0x0a0e,0x00b3, 
+    0x0a10,0x000b, 0x0a10,0x0387, 0x0a16,0x0059, 0x0a18,0x0009, 0x0a1e,0x0043, 
+    0x0a24,0x0085, 0x0a2a,0x0009, 0x0a2d,0x0008, 0x0a32,0x028a, 0x0a32,0x02a7, 
+    0x0a31,0x031c, 0x0a35,0x032e, 0x0a39,0x0006, 0x0a3a,0x0105, 0x0a3a,0x024f, 
+    0x0a3c,0x0299, 0x0a42,0x01ed, 0x0a46,0x0299, 0x0a48,0x01ed, 0x0a4c,0x0059, 
+    0x0a52,0x000b, 0x0a52,0x0387, 0x0a56,0x000b, 0x0a5e,0x0009, 0x0a60,0x003d, 
+    0x0a66,0x0105, 0x0a6a,0x0195, 0x0a6c,0x000b, 0x0a76,0x0053, 0x0a78,0x0009, 
+    0x0a7a,0x008f, 0x0a82,0x0299, 0x0a86,0x01ed, 0x0a8a,0x0027, 0x0a8e,0x004b, 
+    0x0a92,0x003d, 0x0a95,0x0322, 0x0a99,0x0038, 0x0a99,0x0090, 0x0a9c,0x0061, 
+    0x0a9c,0x00c7, 0x0a9c,0x012d, 0x0a9c,0x016f, 0x0a9c,0x017d, 0x0a9c,0x02c9, 
+    0x0a9c,0x0383, 0x0aa1,0x0010, 0x0aa4,0x00b3, 0x0aa8,0x002f, 0x0aac,0x0027, 
+    0x0ab0,0x004b, 0x0ab4,0x0043, 0x0ab9,0x0090, 0x0abd,0x0010, 0x0ac4,0x0019, 
+    0x0acc,0x00f5, 0x0acc,0x022b, 0x0acc,0x037b, 0x0ad2,0x008f, 0x0ad2,0x01f1, 
+    0x0ad6,0x0324, 0x0ad9,0x0330, 0x0ade,0x008f, 0x0ade,0x01f1, 0x0ae0,0x017b, 
+    0x0ae4,0x008f, 0x0ae9,0x004e, 0x0aee,0x0027, 0x0af2,0x028a, 0x0af2,0x02a7, 
+    0x0af1,0x031c, 0x0af6,0x0027, 0x0af9,0x031c, 0x0afe,0x00e9, 0x0afe,0x02bb, 
+    0x0b02,0x000b, 0x0b06,0x00f5, 0x0b06,0x022b, 0x0b06,0x037b, 0x0b0a,0x003d, 
+    0x0000,0x0000 
+};
+
+