--- a/progs/matcher/re1.sc	Sun Oct 02 08:42:01 2022 +0100
+++ b/progs/matcher/re1.sc	Sun Oct 09 13:39:34 2022 +0100
@@ -19,9 +19,9 @@
 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 {
   case ZERO => false
   case ONE => true