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From: Elena <egarrulo@gmail.com>
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Subject: Bidirectional hash or association list library?
Date: Tue, 4 Jan 2011 05:44:13 -0800 (PST)
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Hello,

is there an Emacs Lisp library for *bidirectional* hashes or
association lists?  That is, containers in which both keys and values
can be looked up?

Thanks.