There are several rules governing the use of commas, but there is also a lot freedom. Webster's Third New International Dictionary begins their article on commas with: Of all the marks of punctuation the comma offers the most difficulty in use and the widest range for individual choice. Though often marking rhetorical or elocutionary pauses, the comma is used primarily to separate or to set off in a group.
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Of all the marks of punctuation the comma offers the most difficulty in use and the widest range for individual choice. Though often marking rhetorical or elocutionary pauses, the comma is