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From: levy@princeton.UUCP
Newsgroups: net.nlang
Subject: Re: A query
Message-ID: <197@princeto.UUCP>
Date: Wed, 15-Jun-83 19:44:49 EDT
Article-I.D.: princeto.197
Posted: Wed Jun 15 19:44:49 1983
Date-Received: Thu, 16-Jun-83 23:04:17 EDT
Lines: 1

A "duology" would be the correct derivation.  I don't think it's used.