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Find the minimum value of

$\frac { { x }^{ 2 }+{ y }^{ 2 } }{ z } +\frac { { z }^{ 2 }+{ x }^{ 2 } }{ y } +\frac { { y }^{ 2 }+{ z }^{ 2 } }{ x },$

subject to $x + y + z = 2015$ and $x, y ,z > 0$.

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