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How to find all the derangements of [n]. Specifically,if n is 4?

What is the process to get all the derangments in general?

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    Sorry, what do you mean by 'derangement'? Give an example.2012-09-28
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    http://en.wikipedia.org/wiki/Derangement The article does a pretty good job of describing what I mean by a derangement.2012-09-28

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