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x 2 y 2 dx 2xy dy
x 2-y 2 dx+ x 2-2xy dy 0
xydx+ x 2+y 2 dy 0
y 2dx+ x 2-xy+y 2 dy 0
xydx- x 2+3y 2 dy 0
x 2+y 2 dy xydx
2ydx+ y 2-6x dy 0
x 2ydx- x 3+y 3 dy 0
x 2-y 2 dx+2xydy 0
y 2dx+ xy+x 2 dy 0
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