Found a better example at
http://en.wikipedia.org/wiki/Hyphen
Quote:
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Most text systems consider a hyphen to be a word boundary and a valid point at which to break a line when flowing text. However, this is not always desirable behavior, especially when it could lead to ambiguity (such as in the examples given before, where ‘recreation’ and ‘re-creation’ would be indistinguishable).
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Most text system does not justify text as good as TeX either.