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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Filling woes
Date: Fri, 20 May 2005 17:57:17 -0400
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I agree it would be better to try adaptive-fill-function first.  If it
returns nil, the code should proceed to try the appropriate regexp.

As regards documenting precisely how these variables are used,
that is hard because the code details were designed based
on heuristics.