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\i Semigroups and formal languages\i0 . Eds. Jorge M. Andr\'e9, V\{\\'?\}tor H. Fernandes, M\'e1rio J. J. Branco, Gracinda M. S. Gomes, John Fountain, and John C. Meakin. Proceedings of the International Conference held at the Universidade de Lisboa, Lisboa, July 12?15, 2005. World Scientific Publishing Co. Pte. Ltd., Hackensack, NJ, 2007.\par \par }