From: Brian Candler <b.candler@...>
Date: 2010-09-21T17:38:51+09:00
Subject: Re: An elegant way...

In fact, I forgot it's OK to run off the end of an Array in ruby :-) So 
the inner loop can simplify to this:

    j += 1 while src[j+1] == src[j].sub(/\d+/) { $&.succ }
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