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permute

Language/Type: C++ backtracking recursion
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Write a recursive function named permute that accepts a string as a parameter and outputs all possible rearrangements of the letters in that string. The arrangements may be output in any order. For example, the call of permute("ABC"); should print: 

ABC
ACB
BAC
BCA
CAB
CBA

If the string passed is empty, print no output. Your function must use recursion, but you can use a single for loop if necessary.

Function: Write a C++ function as described, not a complete program.

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