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As an aside, I think it's logical OR that's tricky for non technical/math types since XOR more closely matches common usage.

What? No it doesn't. When people say "No bare ankles or shoulders", that doesn't mean it's ok if you bare both of them.

I think he means when it is used like "coffee or tea?"

The answer to that when one wants both coffee and tea is "yes" rather than "no".

"No food or drink" is a good one, so many possible misinterpretations between or vs. XOR, and how you scope the "not".