P1-c: Items in a series

P1-cUse a comma between all items in a series.

When three or more items are presented in a series, those items should be separated from one another with commas. Items in a series may be single words, phrases, or clauses.

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Although some writers view the last comma in a series as optional, most experts advise using the comma because its omission can result in ambiguity or misreading.

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Did the uncle will his property and houses and boats—or simply his property, consisting of houses and boats? If the former meaning is intended, a comma is necessary to prevent ambiguity.