1   a
2   b
3   c
4     d
5   a
6   b
7   c
8    potentially run one of the every 96 second group 
9   a
10  b
11  c
12    e
13  a
14  b
15  c
16   potentially run one of the every 144 second group 
17  a
18  b
19  c
20    f
21  a
22  b
23  c
24   potentially run one of the every 600 second group