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Zyzzyva, by Michael Thelen, is a word study and word adjudication program. It is freely available and runs under Linux, Windows Vista, Windows XP, Windows 2000, Windows 98, Windows ME, Mac OS X 10.3.9 or later (Panther), Mac OS X 10.4 (Tiger), and Mac OS X 10.5 (Leopard). It has been used as at software self-lookup stations at many North American SCRABBLE tournaments, including BAT, Oregon TILE, the Dallas Open, the National SCRABBLE Championship and the National School SCRABBLE Championship.