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11. PEN K11 (Canada 2002) Find all functions $f: \mathbb{N}_{0}\to \mathbb{N}_{0}$ such that for all
$m, \, n\in \mathbb{N}_{0}$:
$mf(n)+nf(m)=(m+n)f(m^{2}+n^{2}).$
Here, $\mathbb{N}_{0}$ denote the set of all nonnegative integers.