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y 2xy+1 dx-xdy 0
x2dy+ xy+y2 dx 0
y 2xy+e x dx-e xdy 0
x 2dy+y x+y dx 0
y x 2y+e x dx-e xdy 0
xdy-ydx+a x 2+y 2 dx 0
x 2-y dxdy
x 2+y 2 dxdy
xdy- 1+x 2 dx dx
y 2-3xy dx-xdy 0
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