2 //type Pos = (Int, Int)    // a position on a chessboard 

     2 //type Pos = (Int, Int)    // a position on a chessboard 

     3 //type Path = List[Pos]    // a path...a list of positions

     3 //type Path = List[Pos]    // a path...a list of positions

     4 

     4 

     5 def count_all_tours_urban(dim: Int) = {

     5 def count_all_tours_urban(dim: Int) = {

     6   for (i <- (0 until dim).toList; 

     6   for (i <- (0 until dim).toList;