1,2,3,4,5,6,7---------------A
8,9,10,11,12,13,14--------B
15,16,17,18,19,20,21------C
22,23,24,25,26,27,28------D
29,30,31----------------------E
2+7...
1,2,3,4,5,6,7---------------A
8,9,10,11,12,13,14--------B
15,16,17,18,19,20,21------C
22,23,24,25,26,27,28------D
29,30,31----------------------E
2+7...