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From: Mathias Dahl <brakjoller@gmail.com>
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Subject: Re: How to fold any text as I want?
Date: Fri, 02 Nov 2007 14:53:43 +0100
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Magicloud Magiclouds <magicloud.magiclouds@gmail.com> writes:

> Now emacs provides outline and hs modes for folding, I think. But
> they both need some "text hint" to do the hide/show. May I do the
> hide/show by line number? Like "M-x hs-hide-ln 10, 20".

Take a look at hide-region.el. It lets you hide regions of text:

http://www.emacswiki.org/cgi-bin/wiki?HideRegion