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Message: [QUOTE="xhoster, post: 4861404"] It might be possible to integrate that technique into the Fischer-Kause algorithm so that only the unique ones are generated, rather than having to generate, test, and discard. Now that would be some subtle code. I think this is a good start, but it still produces redundant results. For example, if [USER=61407]@set[/USER] = qw/A A C/; # and we number the elements as you did above, then this method will return both: A1 A2 C1 A1 C1 A2 Which are circularly the same once the digits are removed. Xho -- -------------------- [URL]http://NewsReader.Com/[/URL] -------------------- The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. [/QUOTE]