April 28, 2005: Issue 89
When a single prepositional phrase starts a sentence, setting it off with a comma is optional (although, because of the natural pause, we recommend the comma).
acceptable: At a yard sale she found the perfect table.
preferred: At a yard sale, she found the perfect table.
But when multiple prepositional phrases start a sentence, always use a comma after the last one.
incorrect: At a yard sale in her neighborhood on the north side of Chicago she found the perfect table.
correct: At a yard sale in her neighborhood on the north side of Chicago, she found the perfect table.
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