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Parentheses may also be nested (with one set (such as this) inside another set). This is not commonly used in formal writing [though sometimes other brackets (especially parentheses) will be used for one or more inner set of parentheses (in other words, secondary {or even tertiary} phrases can be found within the main sentence)].[citation needed]
This lovely wikipedia article no longer exists. I came across it on the xkcd blag: http://blog.xkcd.com/2011/03/08/parentheses/, where prophetically he comments that posting a blog entry on a wikipedia article usually causes it to be rewritten.
There was a recent On The Media story about a guy who printed out the entire entry for the Iraq War, including all edits and changes. The thing was the size of something like 12 encyclopedia volumes. He said it was something like an inefficient display of data to comment on the subject of Wiki articles.