1, 10, 11, 12, 13, 14, 15, 17, 18, 19, 2, 20, 21, 22, 23, 25, 26, 27, 28, 29, 3, 31, 34, 35, 36, 38, 39, 4, 40, 42, 43, 44, 45, 46, 47, 48, 49, 5, 6, 7, 8, 9