(y-x)²(x-y)+(x-y)³+2(x-y)²(y-x)
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(y-x)²(x-y)+(x-y)³+2(x-y)²(y-x)
(y-x)²(x-y)+(x-y)³+2(x-y)²(y-x)
(y-x)²(x-y)+(x-y)³+2(x-y)²(y-x)