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Let $X$ be a stable curve of genus $g$ over the field $k$, i.e., a $k$-rational point of the Deligne-Mumford stack $M_g$.

What is the genus of the normalization of $X$? Does it depend on the number of singularities of $X$?

Note that the normalization of $X$ is a smooth curve. It is still geometrically connected and it is projective.

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