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L. Cnrs, Equipe Orpailleur -Bâtiment B, Campus Scientifique, B.P. 239, 54506 Vandoeuvre-l` es-Nancy Cedex, France E-mail address: miguel.couceiro@inria.fr (L. Haddad) Department of Mathematics and Computer Science, Royal Military College of Canada, PO Box 17000, Station Forces, K7K 7B4 Canada E-mail address: haddad-l@rmc.ca (K. Schölzel) Mathematics Research Unit rue Richard Coudenhove-Kalergi, L?1359 Luxembourg E-mail address: dr.karsti@gmail.com (T. Waldhauser) Bolyai Institute, p.6720