2, 3, 3, 4, 5, 4, 5, 6, 5, 6, 7, 7, 6, 7, 8, 9, 9, 7, 8, 9, 10, 10, 8, 9, 11, 10, 11, 12, 9, 10, 11, 13, 12, 13, 13, 10, 11, 12, 14, 13, 14, 15, 11, 12, 13, 15, 14, 16, 15, 16, 12, 13, 14, 17, 15, 17, 16, 13, 14, 17, 15, 18, 16, 18, 17, 19, 19, 14, 15, 16, 17
