--- a/re1.scala	Wed Oct 31 08:56:08 2012 +0000
+++ b/re1.scala	Wed Oct 31 21:46:27 2012 +0000
@@ -1,7 +1,5 @@
     
-abstract class Rexp {
-  def simp : Rexp = this
-}
+abstract class Rexp
 
 case object NULL extends Rexp
 case object EMPTY extends Rexp
@@ -45,7 +43,7 @@
 // derivative w.r.t. a string (iterates der)
 def ders (s: List[Char], r: Rexp) : Rexp = s match {
   case Nil => r
-  case c::s => ders(s, der(c, r).simp)
+  case c::s => ders(s, der(c, r))
 }
 
 // main matcher function
@@ -71,7 +69,7 @@
   (end - start)/(i * 1.0e9)
 }
 
-for (i <- 1 to 22) {
+for (i <- 1 to 29) {
   println(i + ": " + "%.5f".format(time_needed(1, matcher(RTEST(i), "a" * i))))
 }