x²y-x²-y²x+y²=xy(x-y)-(x²-y²)=xy(x-y)-(x-y)(x+y)=(x-y)(xy-x-y)
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x²y-x²-y²x+y²=xy(x-y)-(x²-y²)=xy(x-y)-(x-y)(x+y)=(x-y)(xy-x-y)