From: Kenneth Eunjung <ken70r@...>
Date: 2010-04-09T16:48:49+09:00
Subject: Re: match at least one element of array to another

Hmm I came up with a very inelegant way to do this... that is:

@groups.length + @allowed.length > (@groups | @allowed).length

which is equivalent to 4 > 3 so it evaluates to true.

I guess this works but if you come up with a more elegant way please 
share! Thanks.
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