From: "Thriving K." <superdisconnect@...>
Date: 2009-08-04T14:19:34+09:00
Subject: Re: The Easiest way to check if one array is a subset of another

Oop, i already found

http://adzdavies.blogspot.com/2008/02/array-subsets-and-supersets.html

b.to_set.subset?(a.to_set)
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