4, 8, 12..
2, 4, 6...
3, 6, 9...
5, 10 ,15, 20..
1, 2, 3, 4...
25, 30, 35
8, 10, 12, 14
5, 6, 7, 8, 9
12, 15, 18, 21
16, 20, 24, 28
