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x y z x 2 y 2 z 2 xy yz zx
x 2 + y 2 + z 2 x + y + z 2 + xy + yz + zx 2
x y 2 - z 2
x y z 2 -1 2
x 2-xy-y 2+yz+z 2-zx
x 2 y+z
x 2+y 2+z 2-xy-yz-zx
x 2-xy-y 2+yz+z 2-zx 0
x 2+y 2+z 2-yz 1
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