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From: Thomas Gehrlein <thomas.gehrlein@t-online.de>
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Subject: Re: auto-fill-mode for WordWrap
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"Peter Wu" <peterwu@hotmail.com> writes:

> > Also see the command C-x f (set-fill-column).
> 
> When I do this, I am prompted:
> 
> set-fill-column requires an explicit argument
> 
> I don't know how to specify one for it. Please help! :(

You can provide an argument with the command C-u (universal-argument):

C-u 5 4 C-x f

will set the fill-column to 54.

HTH

Thomas