1, 2, 4, 8, 9, 5, 10, 11, 3, 6, 12, 13, 7, 14, 15
8, 4, 9, 2, 10, 5, 11, 1, 12, 6, 13, 3, 14, 7, 15
8, 9, 4, 10, 11, 5, 2, 12, 13, 6, 14, 15, 7, 3, 1
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15