2xy%5E2 %2B2x%5E2 y-2x%5E2 y%5E2 -4xy%2Bx%2By - ( -x%5E4 -y%5E4 %2B2x%5E3 %2B2y%5E3 -2x%5E2 -2y%5E2 %2Bx%2By)

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