1, 2а, 4, 6, 7
1, 2а, 4, 6, 7, 1, 2, 3, 4
1, 2а, 4, 6, 7, 1, 2, 3, 4, 1, 3
1, 2а, 4, 6, 7, 1, 2, 3, 4, 1, 3, 1, 2, 3, 4, 6, 7