import M4a._

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)))

}

import scala.concurrent._

import scala.concurrent.duration._

import ExecutionContext.Implicits.global

import scala.language.postfixOps 

lazy val f = Future {

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))

}

Await.result(f, 32 second)