diff -r e9d14d58be3c -r daf561a83ba6 main_marking4/knight1_test3b.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_marking4/knight1_test3b.scala	Mon Apr 11 23:55:27 2022 +0100
@@ -0,0 +1,19 @@
+import M4a._
+//type Pos = (Int, Int)    // a position on a chessboard 
+//type Path = List[Pos]    // a path...a list of positions
+
+/*
+def count_all_tours_urban(dim: Int) = {
+  for (i <- (0 until dim).toList; 
+       j <- (0 until dim).toList) yield count_tours(dim, List((i, j)))
+}
+*/
+
+def count_all_tours_urban(dim: Int) = {
+  for (i <- (0 until 3).toList; 
+       j <- (0 until dim).toList) yield count_tours(dim, List((i, j)))
+}
+
+
+assert(count_all_tours_urban(5) == List(304, 0, 56, 0, 304, 0, 56, 0, 56, 0, 56, 0, 64, 0, 56))
+