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20 questions
4×14\times14×1
4×24\times24×2
4×34\times34×3
4×44\times44×4
4×54\times54×5
4×64\times64×6
4×74\times74×7
4×84\times84×8
4×94\times94×9
4×104\times104×10
4×114\times114×11
4×124\times124×12
12×412\times412×4
11×411\times411×4
10×410\times410×4
9×49\times49×4
8×48\times48×4
7×47\times47×4
6×46\times46×4
5×45\times45×4
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