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y 2dx xy-x 2 dy
y 2dx+ xy+x 2 dy 0
x x-y dy+y 2dx 0
y 2dx+ x 2-xy+y 2 dy 0
ydx- x+2y 2 dy 0
ydx+ x 2-4x dy 0
ydx+ x-y 2 dy 0
ydx+ x-3y2 dy 0
y 3dx+2 x 3-xy 2 dy 0
ydx+ x+y2 dy 0
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