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10 questions
10-2 =
12
2
8
6
9-6=
4
15
7
3
5- 4=
1
9
20- 13=
23
17
8- 8=
0
5
16
18- 9=
10
9-8=
1-1=
12- 6 =
19- 17=
18
29
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