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y 3dx+2 x 3-xy 2 dy 0
xydx+ x 2+y 2 dy 0
ydx+ x-y 2 dy 0
y-xy 2 dx- x+x 2y dy 0
xydx- x 2+3y 2 dy 0
ydx+ x 2-4x dy 0
y3dx+2 x2-xy2 dy 0
ydx+ x-3y 2 dy 0
x 2+y 2 dy xydx
ydx+ x+y2 dy 0
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