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If a conjunction is inserted, the proper mark is a comma.
William Strunk JR. and E.B. White • The Elements of Style, Fourth Edition

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Bebo • 1 card
A lead is good not because it dances, fires cannons, or whistles like a train but because it is absolute to what follows.
John McPhee • Draft No. 4
A comma is preferable when the clauses are very short and alike in form, or when the tone of the sentence is easy and conversational.
William Strunk JR. and E.B. White • The Elements of Style, Fourth Edition
Enclose parenthetic expressions between commas.
William Strunk JR. and E.B. White • The Elements of Style, Fourth Edition
The Redbook: A Manual on Legal Style, 3d: A Manual on Legal Style (American Casebook Series)
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