diff -r 6a77c260c8a5 -r ac79c2e534bd core_testing2/docdiff_test1.scala
--- a/core_testing2/docdiff_test1.scala	Thu Nov 02 11:32:10 2023 +0000
+++ b/core_testing2/docdiff_test1.scala	Thu Nov 02 12:37:58 2023 +0000
@@ -1,6 +1,7 @@
 
-import C2._
+def urbanmain() = {
+  import C2._
 
-assert(clean("ab a abc") == List("ab", "a", "abc"))
-
-assert(clean("ab*a abc1") == List("ab", "a", "abc1"))
+  assert(clean("ab a abc") == List("ab", "a", "abc"))
+  assert(clean("ab*a abc1") == List("ab", "a", "abc1"))
+}