diff -r f70d74fea67f -r 2a30c7dfe3ed main_marking3/re_test5.scala
--- a/main_marking3/re_test5.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/main_marking3/re_test5.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,6 +1,9 @@
-import M3._
+
+def urbanmain() = {
+
+  import M3._
 
-assert(flts(List(CHAR('a'), ZERO, ONE), Nil) == List(ZERO))
-assert(flts(List(CHAR('a'), ONE, ONE, CHAR('b')), Nil) == List(CHAR('a'), CHAR('b')))
-assert(flts(List(ONE ~ CHAR('a'), CHAR('b') ~ ONE), Nil) == List(ONE, CHAR('a'), CHAR('b'), ONE))
-
+  assert(flts(List(CHAR('a'), ZERO, ONE), Nil) == List(ZERO))
+  assert(flts(List(CHAR('a'), ONE, ONE, CHAR('b')), Nil) == List(CHAR('a'), CHAR('b')))
+  assert(flts(List(ONE ~ CHAR('a'), CHAR('b') ~ ONE), Nil) == List(ONE, CHAR('a'), CHAR('b'), ONE))
+}