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Permutations
Permutations[
list
] generates a list of all possible permutations of the elements in list.
Example: Permutations[
a,b,c
] .
There are  permutations of a list of  distinct elements.
Repeated elements are treated as identical.
The object list need not have head List.
See the Mathematica book: Section 1.8.13.
See also: Sort, Signature, Reverse, RotateLeft.
Related package: DiscreteMath`Permutations`, DiscreteMath`Combinatorica`.
Further Examples
Here are all the 24 permutations on 4 letters.
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Out[1]= 
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