From: Giampiero Zanchi <cidza@...>
Date: 2010-02-16T18:03:35+09:00
Subject: Re: Generating all possible combinations of a 5 digit pattern.

one more solution

p (0..(2**5-1)).map{|n| (n.to_s 2).tr("01", "CN").rjust(5,"C") }

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