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Conventions

13.1.5 Comma problems

  1. Do not use one mark when two are needed to enclose some element.
  2. Do not use commas where a semicolon or a period is required:
      Between independent clauses with no conjunction joining the clauses (such sentences are called "comma splices")
      Between independent clauses joined by conjunctive adverbs
      Between two independent clauses containing internal punctuation but joined by a simple conjunction.
  3. Do not use commas to separate two words, two phrases, or two dependent clauses joined by a simple conjunction (usually "and'').

Courtesy of John Mercer Associates, www.MercerWriting.com

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