class Motif:
    # ...
    def coup_compose(self, *args):
        coups = []
        if self.on(*args):
            a_traiter = self.coup_simple(*args)
            while a_traiter:
                coup, arrivee = a_traiter.pop(0)
                coups.append((coup, arrivee))
                for voisin in coup.coup_simple(*arrivee):
                    if voisin not in a_traiter and voisin not in coups:
                        a_traiter.append(voisin)        
        return coups