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