Format numbers in manuscripts differently if you are writing fiction, to reflect a character or imitate oral speech.
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Jay Van Bavel, PhD on X: One of my favorite features is that we are FORMAT NEUTRAL for initial submissions. This means you don't need to spend 3 days completely reformatting your
Manuscript type. a Bar graph demonstrating composition of the 100 most
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Wordiness (Pt.2 of Line Editing for Fiction Writers)