--- a/templates4/re.scala	Wed Oct 30 12:47:10 2019 +0000
+++ b/templates4/re.scala	Wed Oct 30 14:07:58 2019 +0000
@@ -1,5 +1,7 @@
-// Part 1 about Regular Expression Matching
-//==========================================
+// Core Part about Regular Expression Matching
+//=============================================
+
+object CW9c {
 
 // Regular Expressions
 abstract class Rexp
@@ -37,7 +39,7 @@
   def ~ (r: String) = SEQ(s, r)
 }
 
-// (1) Complete the function nullable according to
+// (5) Complete the function nullable according to
 // the definition given in the coursework; this 
 // function checks whether a regular expression
 // can match the empty string and Returns a boolean
@@ -46,7 +48,7 @@
 //def nullable (r: Rexp) : Boolean = ...
 
 
-// (2) Complete the function der according to
+// (6) Complete the function der according to
 // the definition given in the coursework; this
 // function calculates the derivative of a 
 // regular expression w.r.t. a character.
@@ -54,7 +56,7 @@
 //def der (c: Char, r: Rexp) : Rexp = ...
 
 
-// (3) Complete the simp function according to
+// (7) Complete the simp function according to
 // the specification given in the coursework; this
 // function simplifies a regular expression from
 // the inside out, like you would simplify arithmetic 
@@ -64,7 +66,7 @@
 //def simp(r: Rexp) : Rexp = ... 
 
 
-// (4) Complete the two functions below; the first 
+// (8) Complete the two functions below; the first 
 // calculates the derivative w.r.t. a string; the second
 // is the regular expression matcher taking a regular
 // expression and a string and checks whether the
@@ -75,7 +77,7 @@
 //def matcher(r: Rexp, s: String): Boolean = ...
 
 
-// (5) Complete the size function for regular
+// (9) Complete the size function for regular
 // expressions according to the specification 
 // given in the coursework.
 
@@ -132,3 +134,4 @@
 
 */
 
+}