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The concept of levenshtein automata is described slightly differently within computational linguistics, i.e. the actual levenshtein measure encoded as a two-tape automaton (term that I very much prefer over "transducer"). I believe one of the earlier mentions of this is like such in Schulz & Mihov's Fast String Correction with Levenshtein-Automata (2002). I've a bit of bibliography on recent uses as well,but it would be pretentious to add and it is new research I suppose. Flammie ( talk) 21:41, 15 August 2012 (UTC) reply