I just went through the figures of speech listed in Wikipedia (no linky; tough), and I could not find an entry for a rule that serves as it’s own example. Here are two:
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The passive voice should not be used.
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A preposition is not a word to end a sentence with.
I used to know a lot of these example rules, and I’m sure I’ll think of a dozen more as soon as I post. Is there a formal name for these?