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From: Juri Linkov <juri@jurta.org>
Newsgroups: gmane.emacs.devel
Subject: Re: off-topic: Conversion multi-line diff to single-line
Date: Tue, 30 Aug 2011 00:04:46 +0300
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> Such an output greatly simplifies comparison of large sorted word
> lists with sparse or systematic insertions, deletions, or changes.

I suggest you using `diff --side-by-side --suppress-common-lines'
as is or by converting its output to the Diff normal format
that would be trivial to do from the side-by-side format.