diff -r 244df77507c2 -r 253d1ccb65de main_marking5/bf_test6.scala
--- a/main_marking5/bf_test6.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/main_marking5/bf_test6.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,33 +1,35 @@
-import M5b._
 
-import io.Source
-import scala.util._
+def urbanmain() = {
+  import M5b._
 
-def urban_load_bff(name: String) : String = 
-  Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
+  import io.Source
+  import scala.util._
 
-import scala.concurrent._
-import scala.concurrent.duration._
-import ExecutionContext.Implicits.global
-import scala.language.postfixOps 
+  def urban_load_bff(name: String) : String = 
+    Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
 
-lazy val f = Future {
-  assert(optimise(urban_load_bff("benchmark.bf")).length == 181)
-  assert(optimise(urban_load_bff("sierpinski.bf")).length == 110)
+  import scala.concurrent._
+  import scala.concurrent.duration._
+  import ExecutionContext.Implicits.global
+  import scala.language.postfixOps 
+
+  lazy val f = Future {
+    assert(optimise(urban_load_bff("benchmark.bf")).length == 181)
+    assert(optimise(urban_load_bff("sierpinski.bf")).length == 110)
 
-  assert(run3("[-]", Map(0 -> 100)) == Map(0 -> 0))
-  assert(run3("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10))
-  assert(run3("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42))
-  val hw_urban2 = """+++++[->++++++++++<]>--<+++[->>++++++++++
+    assert(run3("[-]", Map(0 -> 100)) == Map(0 -> 0))
+    assert(run3("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10))
+    assert(run3("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42))
+    val hw_urban2 = """+++++[->++++++++++<]>--<+++[->>++++++++++
                   <<]>>++<<----------[+>.>.<+<]"""
-  assert(run3(hw_urban2) == Map(0 -> 0, 1 -> 58, 2 -> 32))
+    assert(run3(hw_urban2) == Map(0 -> 0, 1 -> 58, 2 -> 32))
 
-  val hw_urban3 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.
+    val hw_urban3 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.
                    +++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."""
 
-  assert(run3(hw_urban3) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87))
+    assert(run3(hw_urban3) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87))
 
+  }
+
+  Await.result(f, 32 second)
 }
-
-Await.result(f, 32 second)
-