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20 questions
2 x 0
0 x 2
2 x 1
1 x 2
2 x 3
3 x 2
2 x 4
4 x 2
2 x 5
5 x 2
2 x 6
6 x 2
2 x 7
7 x 2
2 x 8
8 x 2
2 x 9
9 x 2
2 x 10
10 x 2
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