Do not use a comma with a coordinating conjunction that joins only two words, phrases, or subordinate clauses - Unnecessary commas - Punctuation

Rules for writers, Tenth edition - Diana Hacker, Nancy Sommers 2021

Do not use a comma with a coordinating conjunction that joins only two words, phrases, or subordinate clauses
Unnecessary commas
Punctuation

Though a comma should be used before a coordinating conjunction joining independent clauses (see 33a) or with a series of three or more elements (see 33c), these rules should not be extended to other compound word groups, as shown by the examples on the next page.

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