From: Pierre Pat <theyojimbo@...>
Date: 2009-01-15T11:35:27+09:00
Subject: Re: Returning a duplicate from an Array

I'd do like this:
a.select{|x| a.index(x) != a.rindex(x)}.uniq

Now, I wouldn't know which one is more efficient, but coding wise, I 
like that way :-)

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