diff -r 244df77507c2 -r 253d1ccb65de main_marking3/re_test2.scala
--- a/main_marking3/re_test2.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/main_marking3/re_test2.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,26 +1,30 @@
-import M3._
+
+def urbanmain() = {
+
+  import M3._
 
-assert(der('a', ZERO | ONE) == ALT(ZERO, ZERO))
-assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALTs(List(SEQ(ALT(ONE, ZERO), CHAR('a')), SEQs(List(ONE)))))
-assert(der('a', (CHAR('a') | CHAR('a')) ~ CHAR('a')) == (ONE | ONE) ~ CHAR('a'))
-assert(der('a', STAR(CHAR('a'))) == (ONE ~ STAR(CHAR('a'))))
-assert(der('b', STAR(CHAR('a'))) == (ZERO ~ STAR(CHAR('a'))))
+  assert(der('a', ZERO | ONE) == ALT(ZERO, ZERO))
+  assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALTs(List(SEQ(ALT(ONE, ZERO), CHAR('a')), SEQs(List(ONE)))))
+  assert(der('a', (CHAR('a') | CHAR('a')) ~ CHAR('a')) == (ONE | ONE) ~ CHAR('a'))
+  assert(der('a', STAR(CHAR('a'))) == (ONE ~ STAR(CHAR('a'))))
+  assert(der('b', STAR(CHAR('a'))) == (ZERO ~ STAR(CHAR('a'))))
 
 
-val r0_urban = "a" ~ "b" ~ "c"
-assert(der('a', r0_urban) == (ONE ~ "b") ~ "c")
-assert(der('b', r0_urban) == (ZERO ~ "b") ~ "c")
-assert(der('c', r0_urban) == (ZERO ~ "b") ~ "c")
+  val r0_urban = "a" ~ "b" ~ "c"
+  assert(der('a', r0_urban) == (ONE ~ "b") ~ "c")
+  assert(der('b', r0_urban) == (ZERO ~ "b") ~ "c")
+  assert(der('c', r0_urban) == (ZERO ~ "b") ~ "c")
 
-val r1_urban = (ONE ~ "b") ~ "c"
+  val r1_urban = (ONE ~ "b") ~ "c"
 
-assert(der('a', r1_urban) == ((ZERO ~ "b") | SEQs(List(ZERO))) ~ "c")
-assert(der('b', r1_urban) == ((ZERO ~ "b") | SEQs(List(ONE))) ~ "c")
-assert(der('c', r1_urban) == ((ZERO ~ "b") | SEQs(List(ZERO))) ~ "c")
+  assert(der('a', r1_urban) == ((ZERO ~ "b") | SEQs(List(ZERO))) ~ "c")
+  assert(der('b', r1_urban) == ((ZERO ~ "b") | SEQs(List(ONE))) ~ "c")
+  assert(der('c', r1_urban) == ((ZERO ~ "b") | SEQs(List(ZERO))) ~ "c")
+
+  val r2_urban = ((ZERO ~ "b") | ONE) ~ "c"
 
-val r2_urban = ((ZERO ~ "b") | ONE) ~ "c"
+  assert(der('a', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ZERO))))
+  assert(der('b', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ZERO))))
+  assert(der('c', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ONE))))
+}
 
-assert(der('a', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ZERO))))
-assert(der('b', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ZERO))))
-assert(der('c', r2_urban) == ((((ZERO ~ "b") | ZERO) ~ "c") | SEQs(List(ONE))))
-