5/10 + 2/10
7/10
5/10-2/10
3/10
1/15 + 7/15
8/15
9/15-7/15
2/15
10/20 + 5/20
15/20
15/20-8/20
7/20
17/30 + 8/30
25/30
20/30-9/30
11/30
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