--- a/progs/matcher/re1.sc	Fri Sep 18 00:34:47 2020 +0100
+++ b/progs/matcher/re1.sc	Mon Sep 21 10:44:48 2020 +0100
@@ -17,6 +17,7 @@
 case class SEQ(r1: Rexp, r2: Rexp) extends Rexp  // sequence
 case class STAR(r: Rexp) extends Rexp            // star
 
+
 // nullable function: tests whether a regular 
 // expression can recognise the empty string
 def nullable(r: Rexp) : Boolean = r match {