Share Counting in tens
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0, 10, 20, ....., 40
30
20, 30, 40, ....., 60
50
30, 40, 50, ....., 70
60
0, 10, ....., 30, 40, 50
20
0, 10, 20, 30, ...., 50
40
30, 40, 50, 60, ...., 80
70
