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20 questions
2
3
4
5
6 x 6
9 x 9
12 x 12
3 x 3
1 x 3
2 x 3
3 x 2
3 x 1
1
-9
-2
0
-3
-4
-5
17
18
19
20
a
b
c
d
6
7
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