More tuning in &nf.

.hgignore

@@ -14,21 +14,12 @@ lib/m114*
 lib/bip*
 docs/
 
-src/ext/
-src/ext2/
+src/ext*
 src/xxx/
 src/aig/au/
 src/aig/ssm/
 src/aig/ddb/
 
-src/base/abc2/
-src/base/abc2d/
-src/base/abc3/
-src/base/abc4/
- 
-src/base/pcm/
-src/base/ply/
-
 *~
 *.orig
 

src/misc/extra/extraUtilMisc.c

@@ -2208,7 +2208,12 @@ int * Extra_PermSchedule( int n )
     int nGroups = nFact / n / 2;
     int * pRes = ABC_ALLOC( int, nFact );
     int * pRes0, i, k, b = 0;
-    assert( n > 1 );
+    assert( n > 0 );
+    if ( n == 1 )
+    {
+        pRes[0] = 0;
+        return pRes;
+    }
     if ( n == 2 )
     {
         pRes[0] = pRes[1] = 0;