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