diff -r 1ff267cae316 -r 69f36c98808b pre_marking4/knight1_test3a.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pre_marking4/knight1_test3a.scala	Mon Jan 18 22:12:39 2021 +0000
@@ -0,0 +1,14 @@
+import CW9a._
+
+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)))
+}
+
+
+assert(count_all_tours_urban(1) == List(1))
+assert(count_all_tours_urban(2) == List(0, 0, 0, 0))
+assert(count_all_tours_urban(3) == List(0, 0, 0, 0, 0, 0, 0, 0, 0))
+assert(count_all_tours_urban(4) == List(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
+
+