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x y 2-1 dx+y x 2-1 dy 0
y 2dx+ x 2-xy+y 2 dy 0
y 3dx+2 x 2-xy 2 dy 0
xy-x 2 dy y 2dx
y 2dx+ x-1y dy 0
x 2 dydx x 2-2y 2+xy
x 2+xy dy x 2+y 2 dx
x 2-y 2+y dx+x 2y-1 dy 0
x x-y dy+y 2dx 0
x-2y dx+2 y-x dy 0
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