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(. M. Arnaudon, . Umr, and . Cnrs, 1, France E-mail address: mailto:marc.arnaudon(at)math.u-bordeaux1.fr URL: http://www.math.u-bordeaux1.fr 1, France E-mail address: mailto:michel.bonnefont(at)math.u-bordeaux1.fr URL: http://www.math.u-bordeaux1.fr, Joulin) UMR CNRS 5219