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18 - 9 =
9
15 - 8 =
7
11 - 6 =
5
12 - 9 =
3
12 - 8 =
4
14 - 7 =
7
10 - 5 =
5
11 - 3 =
8
14 - 6 =
8
17 - 8 =
9
13 - 9 =
4
10 - 9 =
1
