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This is determined solely by the writer. If a comma is used before the phrase, it must also be used after the phrase and vice versa (unless the sentence naturally requires one of the commas.)
Ex: We require a letter from your bank, on bank letterhead, stating that you are an authorized signer.
Ex: We require a letter from your bank on bank letterhead stating that you are an authorized signer.
|Jennifer Mathes, Ph.D.|