5m Zen
X xy dy
X xy dy pictures 5
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X xy
X xy dy
xy x 2 dy y 2dx
xy dy dx x 2y
ydx x xy dy 0
x xy dy 0
x xy dy dx
x xy dy
x xy dy ydx
x xy dy y xy dx 0
x xy dy y x y dx
x xy dy y 2dx 0
