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x y z 1 x 2 y 2 z 2 2 x 3 y 3 z 3 3
y 2 + z 2 x 2 + 1
x 2 + y 2 + z 2 z
x 2+y 2 3 x+y+z 0 xy 1 z
x 2+y 2 z 1
x 2+y 2 z 3
x+y+z 1 x 2+y 2+z 2 3
2 x+3 y z 2
z x 2+y 2 12
y x 2+z 2
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