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expand (\sum{i=1}^{40}x^i) (\sum{i=1}^{40}x^i) (\sum{i=1}^{10}x^i)
expand (\sum{i=1}^{40}x^i) (\sum{i=1}^{40}x^i) (\sum{i=1}^{10}x^i)
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