--- a/progs/re3.scala	Mon Oct 24 14:46:47 2016 +0100
+++ b/progs/re3.scala	Sat Oct 29 21:45:44 2016 +0100
@@ -8,6 +8,7 @@
 case class STAR(r: Rexp) extends Rexp 
 case class NTIMES(r: Rexp, n: Int) extends Rexp 
 
+
 // nullable function: tests whether the regular 
 // expression can recognise the empty string
 def nullable (r: Rexp) : Boolean = r match {
@@ -47,7 +48,6 @@
     case (r1s, ONE) => r1s
     case (r1s, r2s) => SEQ(r1s, r2s)
   }
-  case NTIMES(r1, n) => NTIMES(simp(r1), n)
   case r => r
 }