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13 questions
14 - 5 =
10 - 10 =
20
0
10
1
15 - 8 =
19 - 8 =
9
11
8
20 - 8 =
20 - 11 =
19 - 12 =
17
7
15 - 7 =
18 - 10 =
20 - 6 =
4
14
13
19 - 10 =
20 - 7 =
3
12
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