6, 8, 10, 12, 14, 16, S
0, 1, 2, 3, 4
2, 4, 6, 8, 10, 12, 14, 16, 18
2, 4, 6, 8
8, 10, 12, 14, 16, 18
6, 8, 10, 12, 14, 16, 18