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\(x, y\) and \(z \) are positive reals. What is the maximum value of

\[ \frac { \big( (x+y+z)^3 - x^3-y^3-z^3 \big)^2} {(x^2+y^2+z^2)^3 -x^6-y^6-z^6} ? \]

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