diff -r e2170c91a9f2 -r 6282b88511d8 pre_marking4/knight1_test3b.scala
--- a/pre_marking4/knight1_test3b.scala	Mon Jan 18 22:12:39 2021 +0000
+++ b/pre_marking4/knight1_test3b.scala	Fri Jan 22 10:35:50 2021 +0000
@@ -2,11 +2,18 @@
 //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, 0, 56, 0, 56, 0, 304, 0, 56, 0, 304))
+assert(count_all_tours_urban(5) == List(304, 0, 56, 0, 304, 0, 56, 0, 56, 0, 56, 0, 64, 0, 56))