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Hyphens, en-dashes and em-dashes are frequently used punctuation marks that are just as frequently misunderstood. All three marks are essentially horizontal lines, though their lengths vary (as do, occasionally, their designs – see figure 1). However, these three different marks have very different purposes, and using a hyphen to do an m-dash’s job is just as much of a punctuation error as using a question mark in place of a comma. View all 51 works by Strizver, Ilene View all 55 works published by Upper and lowercase Magazine |
 Hyphens, En-Dashes and Em-Dashes http://www.itcfonts.com/Ulc/2811/HyphensEtc.htm
Strizver, Ilene Upper and lowercase Magazine 2002
Abstract: Hyphens, en-dashes and em-dashes are frequently used punctuation marks that are just as frequently misunderstood. All three marks are essentially horizontal lines, though their lengths vary (as do, occasionally, their designs – see figure 1). However, these three different marks have very different purposes, and using a hyphen to do an m-dash’s job is just as much of a punctuation error as using a question mark in place of a comma.
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