This is “Dashes”, section 3.7 from the book Successful Writing (v. 1.0).
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A dash (—)A punctuation mark used to set off information in a sentence for emphasis. is a punctuation mark used to set off information in a sentence for emphasis. You can enclose text between two dashes, or use just one dash. To create a dash in Microsoft Word, type two hyphens together. Do not put a space between dashes and text.
Arrive to the interview early—but not too early.
Any of the suits—except for the purple one—should be fine to wear.
On your own sheet of paper, clarify the following sentences by adding dashes. If the sentence is clear as it is, write OK.