1, 2, 3, 4, 5, a, b, c, d, f, g, h, i
1, 2, 3, 4, 5, c, d, f, g, h, i
1, 2, 3, 4, 5, c, d, e, f, g, h, i
1, 2, 3, 4, 5, c, d, f, g, h, i, j, k, l
1, 2, 3, 4, 5
...