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A. Explicit, . Reduction, . The, . Sphere, . An et al., Evangelis Bartzos: vangelishowl@yahoo.gr E-mail address, Vincent Borrelli: borrelli@math.univ-lyon1.fr E-mail address, Roland Denis: roland.denis@math.univ-lyon1.fr E-mail address, Francis Lazarus: Francis.Lazarus@gipsa-lab.fr E-mail address, Damien Rohmer: damien.rohmer@inria.fr E-mail address