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15 questions
14 - 2 =
10 - 7 =
4
3
5
2
18 - 4 =
12 - 6 =
7
6
14 - 7 =
10 - 8 =
18
1
11 - 5 =
18 - 5 =
14 - 6 =
8
13 - 2 =
14 - 5 =
9
11
16 - 3 =
15 - 4 =
12
10
14 - 1 =
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