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x 2 y 2 z 2 r 2 graph
x 2+y 2 r 2 y 2+z 2 r 2 z 2+x 2 r 2
x 2 + y 2 + z 2 r 2
x 2 + y 2 z 2
x y 2 - z 2
x 2+y 2+z 2 2 z
x 2+y 2 2z 2
x 2-y 2-z 2 1
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