Removing duplicate text

To: debian-user@lists.debian.org
Subject: Removing duplicate text
From: Wilfred Zegwaard <wilfred.zegwaard@gmail.com>
Date: Sun, 24 May 2009 18:41:12 +0200
Message-id: <[🔎] 1243183272.8938.1.camel@localhost>

Dear users,

I've got a textfile with a lot of duplicate text. How do I remove it?
I'm using Emacs 21.

Wilfred

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