--- a/progs/pow.scala	Tue Jan 12 02:49:26 2016 +0000
+++ b/progs/pow.scala	Mon Feb 22 22:09:31 2016 +0000
@@ -12,6 +12,9 @@
 val B = Set("a", "b", "c", "")
 pow(B, 4).size                            // -> 121
 
+val B2 = Set("a", "b", "c", "")
+pow(B2, 3).size                           // -> 40
+
 val C = Set("a", "b", "")
 pow(C, 2)
 pow(C, 2).size                            // -> 7