Your solution is perhaps more elegant, but it's also less efficient, as data has to be passed back between instances of the function. I tested, and on the call: 
my @arr = comb('A'..'R');

[download]
my code took approx. 23 seconds, while yours took 30.

In reply to Re: Unique Character Combinations by TedPride
in thread Unique Character Combinations by TedPride

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