CountPermutations ( string )
To determine the number of permutations for a string of characters
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Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
needs sub function (embedded here for efficiency). algorithm builds a formula along the lines of
((....( stringlength! / numberofduplicate1! ) / numberofduplicate2!)/.........)/numberofduplicateN!)
then evaluates it.
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