From: "Jan E." <lists@...>
Date: 2012-04-13T00:05:56+09:00
Subject: Re: ruby v.1.8.6. Expand array class, make combinations

Well, if you really just need this one method, I think installing a 
complete library is a bit too much. I mean, this is no special algorithm 
but a very basic operation that you can program ad hoc.

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