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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
Newsgroups: gmane.emacs.help
Subject: Making a command undoable
Date: Fri, 31 Aug 2012 18:16:48 +0100
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Hello,

you have written a command and you want to make it undoable by using
`undo'.  How do you accomplish that?

Thanks.