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Well one movie can be in many categories. And Netflix has some pretty diverse categories (e.g. "Movies featuring an epic Nicholas Cage breakdown", which appeared once for me).

Though I suspect some of the 76000 categories contain only movies that are no longer available.

One movie can be in multiple categories.

Each title belongs to about five categories on average?

> Each title belongs to about five categories on average?

Only if each category contains one title on average. More likely each title belongs to more than a hundred categories on average.