Maximum nesting of administrative boundaries

I have an oddity question, that I’m wondering if someone can figure out how to answer.

So you have country boundaries tagged boundary=administrative + admin_level=2, and then states at admin_level=4 and so forth. So, if you have a city within a county within a state within a country, that’s four total levels.

I am wondering what is the deepest nesting that exists in the database? Does anyone have a technique that might work to be able to determine this?

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