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X 2 2xy 5x 6y 6
X 2 2xy 5x 6y 6 pictures 5
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X 2 2xy
X 2 2xy 5x 6y 6
x 2 2xy 5x 6y 6 u56E0u6570 u5206u89E3
x^2+2xy-5x-6y+6
