--- a/main_marking2/danube_test4.scala	Thu Jan 13 12:55:03 2022 +0000
+++ b/main_marking2/danube_test4.scala	Mon Apr 11 23:55:27 2022 +0100
@@ -1,7 +1,7 @@
 
 // first test 
 
-import CW7b._
+import M2._
 
 def urban_groupById(ratings: List[(String, String)]) = 
   ratings.groupBy(_._1).view.mapValues(_.map(_._2)).toMap