2, 4, 6, 8, 10, 12, 14, 16, 18
4, 6, 8, 10, 12, 14, 16, 18
1, 2, 4, 6, 8, 10, 12, 14, 16, 18
1, 2, 4, 6
1, 2
6, 8, 10, 12, 14
14, 16, 18
6, 8, 10, 12, 14, 16
2000, 1, 2