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x 2 y 2 z 2 x y z 2 xy yz zx 2
x 2 + y 2 + z 2 x + y + z 2 + xy + yz + zx 2
x 2 + y 2 + z 2 z
x y 2 - z 2
x 2+y 2+z 2 2 z
x 2+y 2+z 2 xyz
x 2-yz+zx-y 2
x 2-xy-y 2+yz+z 2-zx
x 2+y 2+z 2-xy-yz-zx
x 2-xy-y 2+yz+z 2-zx 0
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