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