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Possible Duplicate:
Are there any better methods to do permutation of string?
I know recursion and can write programs like fibonacci number, tree traversals so I think I know it but when it comes to this question specifically I feel bad
Please guide me with how to calculate all possible permutations of a string
Here is good examples of different permutation algorithms, including recursive one: http://www.bearcave.com/random_hacks/permute.html