Does anyone know if there’s a Ruby-/Artistic-Licensed implementation of
the diff algorithm? The one listed in RAA by Lars Christensen is GPL. I
searched the archive and Ned Konz said he ported his own Algorithm::Diff
Perl module, but it looks like he didn’t make it available publicly.
I have to admit though, reading Lars’ code, how much clearer and more
concise the Ruby version is, and the language played a significant part
on this. Ruby rocks 
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dave