Keywords. Regular language, falsification by fellow traveler property
AMS subject classification. Primary: 20F65. Secondary: 20F10, 68Q80.
Submitted: 21 September 2004. Accepted: 25 February 2005. Published: 10 March 2005.
School of Mathematics and Statistics, University of St Andrews
North Haugh, St Andrews, Fife, KY16 9SS, Scotland
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