1, 1-9, 10, 11, 11-15, 12, 13, 14, 15, 16, 17, 18, 18-21, 2, 20, 21, 22, 23, 24, 25, 26, 28, 29, 3, 30, 31, 32, 33, 34, 35, 36, 38, 39, 4, 40, 41, 42, 43, 44, 46, 48, 5, 8, 9