1
2
import CW7a._
3
4
val urban_list1 = List("a", "b", "b", "c", "d")
5
val urban_list2 = List("d", "b", "d", "b", "d")
6
7
assert(prod(urban_list1, urban_list2) == 7)
8
assert(prod(urban_list1, urban_list1) == 7)
9
assert(prod(urban_list2, urban_list2) == 13)