1, 2
1, 2, 1, 10, 11, 12, 13, 14, 18, 20, 2а, 4, 6, 8, 9
1, 2, 1, 10, 11, 12, 13, 14, 18, 20, 2а, 4, 6, 8, 9, 1, 11, 13, 15, 2, 3, 4, 5, 6, 7, 9