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diff --git a/src/opt/sim/simSym.c b/src/opt/sim/simSym.c
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+/**CFile****************************************************************
+
+  FileName    [simSym.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Network and node package.]
+
+  Synopsis    [Simulation to determine two-variable symmetries.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - June 20, 2005.]
+
+  Revision    [$Id: simSym.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "abc.h"
+#include "sim.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+ 
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFITIONS                           ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Computes two variable symmetries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Sim_ComputeTwoVarSymms( Abc_Ntk_t * pNtk )
+{
+    Sym_Man_t * p;
+    Vec_Ptr_t * vResult;
+    int Result;
+    int i, clk = clock();
+
+//    srand( time(NULL) );
+    srand( 0xABC );
+
+    // start the simulation manager
+    p = Sym_ManStart( pNtk );
+    p->nPairsTotal = Sim_UtilCountAllPairs( p->vSuppFun, p->nSimWords, p->vPairsTotal );
+
+    // detect symmetries using circuit structure
+    Sim_SymmsStructCompute( pNtk, p->vMatrSymms );
+    p->nPairsSymm = p->nPairsSymmStr = Sim_UtilCountPairs( p->vMatrSymms, p->vPairsSym );
+
+printf( "Total = %6d.  Sym = %6d.  NonSym = %6d.  Remaining = %6d.\n", 
+       p->nPairsTotal, p->nPairsSymm, p->nPairsNonSymm, p->nPairsTotal-p->nPairsSymm-p->nPairsNonSymm );
+
+    // detect symmetries using simulation
+    for ( i = 1; i <= 1000; i++ )
+    {
+        // generate random pattern
+        Sim_UtilGetRandom( p->uPatRand, p->nSimWords );
+        // simulate this pattern
+        Sim_SymmsSimulate( p, p->uPatRand, p->vMatrNonSymms );
+        if ( i % 100 != 0 )
+            continue;
+        // count the number of pairs
+        p->nPairsSymm    = Sim_UtilCountPairs( p->vMatrSymms,    p->vPairsSym );
+        p->nPairsNonSymm = Sim_UtilCountPairs( p->vMatrNonSymms, p->vPairsNonSym );
+
+printf( "Total = %6d.  Sym = %6d.  NonSym = %6d.  Remaining = %6d.\n", 
+       p->nPairsTotal, p->nPairsSymm, p->nPairsNonSymm, p->nPairsTotal-p->nPairsSymm-p->nPairsNonSymm );
+    }
+
+    Result = p->nPairsSymm;
+    vResult = p->vMatrSymms;  
+    //  p->vMatrSymms = NULL;
+    Sym_ManStop( p );
+    return Result;
+}
+
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+