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diff --git a/src/aig/dch/dchInt.h b/src/aig/dch/dchInt.h
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+++ b/src/aig/dch/dchInt.h
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+/**CFile****************************************************************
+
+  FileName    [dchInt.h]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Choice computation for tech-mapping.]
+
+  Synopsis    [External declarations.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 29, 2008.]
+
+  Revision    [$Id: dchInt.h,v 1.00 2008/07/29 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+ 
+#ifndef __DCH_INT_H__
+#define __DCH_INT_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                          INCLUDES                                ///
+////////////////////////////////////////////////////////////////////////
+
+#include "aig.h"
+#include "satSolver.h"
+#include "dch.h"
+
+////////////////////////////////////////////////////////////////////////
+///                         PARAMETERS                               ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                         BASIC TYPES                              ///
+////////////////////////////////////////////////////////////////////////
+
+// equivalence classes
+typedef struct Dch_Cla_t_ Dch_Cla_t;
+struct Dch_Cla_t_
+{
+    int              nNodes;       // the number of nodes in the class
+    int              pNodes[0];    // the nodes of the class
+};
+
+// choicing manager
+typedef struct Dch_Man_t_ Dch_Man_t;
+struct Dch_Man_t_
+{
+    // parameters
+    Dch_Pars_t *     pPars;
+    // AIGs used in the package
+    Vec_Ptr_t *      vAigs;        // user-given AIGs
+    Aig_Man_t *      pAigTotal;    // intermediate AIG
+    Aig_Man_t *      pAigFraig;    // final AIG
+    // equivalence classes
+    Dch_Cla_t **     ppClasses;    // classes for representative nodes
+    // SAT solving
+    sat_solver *     pSat;         // recyclable SAT solver
+    Vec_Int_t **     ppSatVars;    // SAT variables for used nodes
+    Vec_Ptr_t *      vUsedNodes;   // nodes whose SAT vars are assigned
+    // runtime stats
+};
+
+////////////////////////////////////////////////////////////////////////
+///                      MACRO DEFINITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                    FUNCTION DECLARATIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/*=== dchAig.c =====================================================*/
+extern Aig_Man_t *     Dch_DeriveTotalAig( Vec_Ptr_t * vAigs );
+extern Aig_Man_t *     Dch_DeriveChoiceAig( Aig_Man_t * pAig );
+
+/*=== dchMan.c =====================================================*/
+extern Dch_Man_t *     Dch_ManCreate( Vec_Ptr_t * vAigs, Dch_Pars_t * pPars );
+extern void            Dch_ManStop( Dch_Man_t * p );
+
+/*=== dchSat.c =====================================================*/
+ 
+/*=== dchSim.c =====================================================*/
+extern Dch_Cla_t **    Dch_CreateCandEquivClasses( Aig_Man_t * pAig, int nWords, int fVerbose );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+