Use a comma to separate items in an enumeration.
Example: Old McDonald had a pig, a dog, a cow, a horse.
The comma before “and” is optional. (Choose the option you like best and stick to it.)
Example:
Old McDonald had a pig, a dog, a cow and a horse.
Old McDonald had a pig, a dog, a cow, and a horse.
Don’t use a comma before “and” if two items are a unit (“Ham and eggs” as a dish is a unit and should therefore not be separated by a comma.)
Example:
Old McDonald had soup, ham and eggs and apple pie for dinner.
Old McDonald had soup, ham and eggs, and apple pie for dinner.
Don’t use a comma if all items in an enumeration are separated by “and”, “or”, “nor” etc.
Example:
Old McDonald had a pig and a dog and a cow and a horse.
Old McDonald had a pig or a dog or a cow or a horse.
Old McDonald neither had a pig nor a dog nor a cow nor a horse.
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