2, 1, 2, 3, 2, 3, 4, 5, 3, 5, 6, 7, 5, 6, 7, 8, 6, 7, 9, 10, 7, 9, 10, 11, 8, 10, 11, 13, 10, 11, 13, 14, 11, 13, 14, 15, 12, 14, 15, 17, 13, 15, 17, 18, 14, 16, 18, 19, 15, 17, 19, 21, 17, 19, 20, 22, 18, 20, 22, 23, 19, 21, 23, 24, 20, 22, 24, 26, 21, 23, 25, 27, 22, 25, 26, 28
