Okay, so I know it “a hyperactive baby” is correct, and “an occasionally delightful” is correct, but what do I do when I throw in parentheses? Should it be “a (occasionally) hyperactive” or “an (occasionally) hyperactive?”

Where’s my AP Stylebook? Right, at work. Fuck. (And why is it still there? It’s been well over five years since I had any role managing content.)

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You know, Google sucks for this kind of question.