diff -r 244df77507c2 -r 253d1ccb65de core_marking2/docdiff_test1.scala
--- a/core_marking2/docdiff_test1.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/core_marking2/docdiff_test1.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,4 +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"))
+}