1, 2, 3
1, 2, 3, 2, 3, 4, 5, 6
1, 2, 3, 2, 3, 4, 5, 6, 7
1, 2, 3, 2, 3, 4, 5, 6, 7, 1, 11, 13, 2, 3, 5, 9