fromList [([[0,0]],[1,1]),([[0,1]],[0,1]),([[0,2]],[2,0]),([[0,3]],[3,0]),([[1,0]],[1,0]),([[1,1]],[0,0]),([[1,2]],[2,1]),([[1,3]],[3,1]),([[2,0]],[0,2]),([[2,1]],[1,2]),([[2,2]],[3,3]),([[2,3]],[2,3]),([[3,0]],[0,3]),([[3,1]],[1,3]),([[3,2]],[3,2]),([[3,3]],[2,2])]