--- a/progs/re1.scala	Fri Oct 02 08:48:46 2015 +0100
+++ b/progs/re1.scala	Fri Oct 02 23:44:14 2015 +0100
@@ -39,10 +39,10 @@
 def matches(r: Rexp, s: String) : Boolean = nullable(ders(s.toList, r))
 
 //example from the homework
-//val r = STAR(ALT(SEQ(CHAR('a'), CHAR('b')), CHAR('b')))
-//der('a', r)
-//der('b', r)
-//der('c', r)
+val r = STAR(ALT(SEQ(CHAR('a'), CHAR('b')), CHAR('b')))
+der('a', r)
+der('b', r)
+der('c', r)
 
 //optional: one or zero times
 def OPT(r: Rexp) = ALT(r, EMPTY)