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If your source is HTML, an em-dash can be inserted using the HTML entity value "—". It's a "long" dash. An em-dash is used like this—to separate a portion of a sentence—rather than to join words, as a hyphen is. In ASCII text it's generally represented as either two hyphens ("--") or as a hyphen with a space on either side of it ( - ), but it's a lot better to use the "real" dash character if you can.
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