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