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Expand[((Sum[x^i,{i,0,12}])^3)*(Sum[x^i,{i,0,7}])(Sum[x^i,{i,0,5}])]
Expand[((Sum[x^i,{i,0,12}])^3)*(Sum[x^i,{i,0,7}])(Sum[x^i,{i,0,5}])]
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