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From: Vaughan Pratt <pratt@cs.stanford.edu>
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Subject: Attribution re no membership-respecting morphisms
Date: Mon, 21 Aug 2006 08:29:44 -0700
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I've attributed the third saying at

   http://boole.stanford.edu/dotsigs.html

to Mike Barr.  If there's an earlier attribution I should be using
please let me know.

Vaughan Pratt