--- a/progs/re2.scala	Mon Nov 14 15:50:42 2016 +0000
+++ b/progs/re2.scala	Sat Jan 07 14:52:26 2017 +0000
@@ -1,4 +1,5 @@
-// version with explicit n-times regular expression
+// version with explicit an n-times regular expression
+// this keeps the regular expression small
 
 abstract class Rexp 
 case object ZERO extends Rexp