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Re:African American Vernacular English Is Not Standard Engli... by conistonwater on Thursday October 12, 2017 @03:08PM (#15460446)
> What is the difference between a "rule" and a "mistake"?

Your question is answered directly in Pullum's article, at length. He even gives a separate explicit example of the who-whom distinction and explains how it works and how to think about it. There is a clear reason for why this is not arbitrary.

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