1, 2, 4, 6
1, 2, 4, 6, 1, 3, 4, 5
1, 2, 4, 6, 1, 3, 4, 5, 1, 2
1, 2, 4, 6, 1, 3, 4, 5, 1, 2, 1, 2, 3, 6