% Strimko Weekly Set 068
n = 4;
streams = array2d(1..n, 1..n, [
                    1,2,2,4,
                    2,1,4,2,
                    3,4,1,3,
                    4,3,3,1
                  ]);
num_placed = 3;
placed = array2d(1..num_placed, 1..3, [
                             2,2,3,
                             2,3,2,
                             3,3,1
                           ]);