2 files changed, 17 insertions, 0 deletions
diff --git a/src/aig/cnf/cnf.h b/src/aig/cnf/cnf.h
index 5c742f5d..f4f782df 100644
--- a/src/aig/cnf/cnf.h
+++ b/src/aig/cnf/cnf.h
@@ -136,6 +136,7 @@ extern Cnf_Dat_t *     Cnf_DataAlloc( Aig_Man_t * pAig, int nVars, int nClauses,
 extern Cnf_Dat_t *     Cnf_DataDup( Cnf_Dat_t * p );
 extern void            Cnf_DataFree( Cnf_Dat_t * p );
 extern void            Cnf_DataLift( Cnf_Dat_t * p, int nVarsPlus );
+extern void            Cnf_DataFlipLastLiteral( Cnf_Dat_t * p );
 extern void            Cnf_DataPrint( Cnf_Dat_t * p, int fReadable );
 extern void            Cnf_DataWriteIntoFile( Cnf_Dat_t * p, char * pFileName, int fReadable );
 extern void *          Cnf_DataWriteIntoSolver( Cnf_Dat_t * p, int nFrames, int fInit );
diff --git a/src/aig/cnf/cnfMan.c b/src/aig/cnf/cnfMan.c
index f1c446fe..1e650a05 100644
--- a/src/aig/cnf/cnfMan.c
+++ b/src/aig/cnf/cnfMan.c
@@ -213,6 +213,22 @@ void Cnf_DataLift( Cnf_Dat_t * p, int nVarsPlus )
   SeeAlso     []
 
 ***********************************************************************/
+void Cnf_DataFlipLastLiteral( Cnf_Dat_t * p )
+{
+    p->pClauses[0][p->nLiterals-1] = lit_neg( p->pClauses[0][p->nLiterals-1] );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Writes CNF into a file.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
 void Cnf_DataPrint( Cnf_Dat_t * p, int fReadable )
 {
     FILE * pFile = stdout;