diff -r 244df77507c2 -r 253d1ccb65de main_marking5/bf_test4b.scala
--- a/main_marking5/bf_test4b.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/main_marking5/bf_test4b.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,21 +1,23 @@
-import M5a._
 
+def urbanmain() = {
+
+  import M5a._
 
-import scala.concurrent._
-import scala.concurrent.duration._
-import ExecutionContext.Implicits.global
-import scala.language.postfixOps 
+  import scala.concurrent._
+  import scala.concurrent.duration._
+  import ExecutionContext.Implicits.global
+  import scala.language.postfixOps 
 
-lazy val f = Future {
-val urban_bench = 
-""">+[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++
+  lazy val f = Future {
+    val urban_bench = 
+      """>+[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++
    [>++++++++<-]>.[-]<<>++++++++++[>++++++++++[>++
    ++++++++[>++++++++++[>++++++++++[>++++++++++[>+
    +++++++++[-]<-]<-]<-]<-]<-]<-]<-]++++++++++."""
 
-assert(run(urban_bench, Map()) == 
-  Map(0 -> 10, 5 -> 0, 1 -> 0, 6 -> 0, 2 -> 0, 7 -> 0, 3 -> 0, 4 -> 0))
+  assert(run(urban_bench, Map()) == Map(0 -> 10, 5 -> 0, 1 -> 0, 6 -> 0, 2 -> 0, 7 -> 0, 3 -> 0, 4 -> 0))
 
-}
+  }
 
-Await.result(f, 32 second)
+  Await.result(f, 32 second)
+}