test whether a string is a permutation
IsPermutation( s )
The IsPermutation(s) command returns the value true if the string s is a permutation of its support, and returns the value false otherwise. A string is a permutation if, and only if, each character in the string occurs exactly once.
Note that, since there are only 255 distinct characters (byte values), the Pigeon-Hole Principle implies that no string permutation can exceed 255 characters in length.
If s is the empty string, the command returns true.
All of the StringTools package commands treat strings as (null-terminated) sequences of 8-bit (ASCII) characters. Thus, there is no support for multibyte character encodings, such as unicode encodings.
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