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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: define-derived-mode again (was: Emacs design question)
Date: Thu, 24 Jul 2003 15:59:06 -0400
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    As mentioned, in my view of the world, they all have a parent.
    But this aside, we can also make the PARENT argument optional
    (since it's always a symbol and the next arg (the mode's name) is
    always a string).

Ok.