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y 2dx xy-x 2 dy
y 2dx+ x 2-xy-y 2 dy 0
x x-y dy+y 2dx 0
ydx+ x 2-4x dy 0
ydx+ x-y 2 dy 0
y-2 dx- x-y-1 dy 0
ydx+ 2x+3y dy 0
x-2y dx+2 y-x dy 0
y-2 dx + 3x-y dy 0
ydx- x+y 3 dy 0
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