1, 12, 2, 3, 4, 6, 7, 8
1, 12, 2, 3, 4, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 2, 20, 21, 23, 24, 25, 26, 27, 3, 4, 5, 6, 8, 9