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Using a comma between all the items in a series, including the last two, avoids this problem. This last commathe one between the word and and the preceding wordis often called the serial comma or the Oxford comma. In newspaper writing, incidentally, you will seldom find a serial comma, but that is not necessarily a sign that it should be omitted in academic prose.
Use of the comma can be categorized into ten rules. In English there are always exceptions to every rule, but in general, if the situation does not meet the requirements of one of these rules, a comma is most likely not necessary. 1. Use a comma before a coordinating conjunction joining independent clauses.