1, 2, 7

1, 2, 7, 10, 11, 12, 13, 15, 16, 18, 19, 2, 20, 21, 22, 23, 24, 25, 29, 3, 30, 31, 33, 34, 35, 36, 38, 39, 40, 41, 44, 45, 46, 47, 49, 52, 6, 7, 8