diff -r de59aa20a1dc -r ffce7b61b446 main_testing3/re_test2.scala
--- a/main_testing3/re_test2.scala	Mon Nov 08 01:16:13 2021 +0000
+++ b/main_testing3/re_test2.scala	Mon Nov 08 01:39:00 2021 +0000
@@ -1,4 +1,4 @@
-import CW8c._
+import M3._
 
 assert(der('a', ZERO | ONE) == (ZERO | ZERO))
 assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALT((ONE | ZERO) ~ CHAR('a'), ONE))