diff -r f70d74fea67f -r 2a30c7dfe3ed core_marking1/collatz_test3.scala
--- a/core_marking1/collatz_test3.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/core_marking1/collatz_test3.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -3,10 +3,13 @@
 import ExecutionContext.Implicits.global
 import scala.language.postfixOps 
 
-lazy val f = Future {
-assert(C1.last_odd(113) == 85)
-assert(C1.last_odd(84) == 21)
-assert(C1.last_odd(605) == 341)
+def urbanmain() = {
+  
+  lazy val f = Future {
+    assert(C1.last_odd(113) == 85)
+    assert(C1.last_odd(84) == 21)
+    assert(C1.last_odd(605) == 341)
+  }
+
+  Await.result(f, 32 second)
 }
-
-Await.result(f, 32 second)