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Add : x y ^(2) z ^(2)+ 3x ^(2) y ^(2) ...

Add :
`x y ^(2) z ^(2)+ 3x ^(2) y ^(2) z - 4x ^(2)yz ^(2), - 9x ^(2) y ^(2) z + 3x y ^(2) z ^(2) + x ^(2) yz ^(2)`

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