Let $x,$ $y,$ $z$ be nonzero real numbers such that $x + y + z = 0,$ and $xy + xz + yz \neq 0.$  Find all possible values of
\[\frac{x^5 + y^5 + z^5}{xyz (xy + xz + yz)}.\]Enter all possible values, separated by commas.

Let's think step by step and output the final answer within \boxed{}.
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