5m Zen
X2 y2 2x 2
X2 y2 2x 2 pictures 5
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X2 y2
X2 y2 2x 2
x2 y2 2x 2 0
x2 y2 2x 4y 2 0
x2 y2 2x 2y 2
x2 y2 2x 2y u2212 2 0
x2 y2 2x 2 0 y x 1
x2 y2 2x 2
