N = parity(f, R, L)
Let we have a super algebra (ring), $R=R_0 \oplus R_1$. A homogeneous element of $R$ is an element belongs to $R_0$ or $R_1$. This function has three outputs,-1 for non-homogeneous, 0 for homogeneous and even, and 1 for homogeneous and odd elements.
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The object parity is a method function.