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Can I place a sentence between em-dashes? If I can, should I put a period, or not?

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up vote 6 down vote accepted

You can place a sentence between em dashes—people do it all the time—but you shouldn't put a period after it.

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No spaces before and after em-dashes? – Chang Oct 16 '11 at 1:23
It depends. See Wikipedia—en.wikipedia.org/wiki/Em_dash#Em_dash. – zpletan Oct 16 '11 at 1:41
A single sentence would be fine. Multiple sentences can make interpretation confusing, e.g. "He knew — she knew that he knew — that." is fine, but "He knew — he'd long suspected. Now he knew — that." looks like two separate sentences at first. – Sean Duggan Feb 25 '14 at 21:01

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