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Using Commas
The Series Comma
The series comma is used to separate items in a list
of three or more items. Items in a list can be single words,
phrases, or clauses.
Examples:
We purchased books, papers, pencils, and erasers.
(words in a list)
He studies for an hour in the morning, at noon, and
in the evening. (prepositional phrases in a list)
John typed the letter, Mary copied it, and I mailed
it. (main clauses in a list)