--- a/progs/display/nfa.scala	Tue May 09 12:31:55 2017 +0100
+++ b/progs/display/nfa.scala	Wed May 10 17:03:21 2017 +0100
@@ -1,6 +1,8 @@
 // NFAs in Scala using partial functions (returning
 // sets of states)
-import scala.util.Try
+//
+// needs :load dfa.scala   for states
+
 
 // type abbreviation for partial functions
 type :=>[A, B] = PartialFunction[A, B]