How to create non-unique sub-category slugs?

I’d look into using custom post types for the repetitive parts of your permalinks. Cities can be categories, and the restaurant types can be post types. It’s the perfect use for post types, and it helps solve the problem.

Unfortunately I can only see it helping with one sub-level. If you need sub-sub-categories you’ll have to find another WordPress feature with a URL presence that you can “bend” to fit your purpose.

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