2, 4, 6
2, 4, 6, 1, 2, 4, 6, 8
2, 4, 6, 1, 2, 4, 6, 8, 6, 7
2, 4, 6, 1, 2, 4, 6, 8, 6, 7, 1, 2, 3, 4, 5