A comma before the final and is called the Oxford comma. Here is Oxford's comment: The 'Oxford comma' is an optional comma before the word 'and' at the end of a list: We sell books, videos, and magazines. It is so called because it was traditionally used by printer's readers and editors at Oxford University Press.
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We sell books, videos, and magazines.It is so called because it was traditionally used by printer's readers and editors at Oxford University Press. Sometimes it can be necessary for