 A Schottky group is called classical if all the disjoint Jordan curves corresponding to some set of generators can be chosen to be circles.gave an indirect and non-constructive proof of the existence of non-classical Schottky groups, and gave an explicit example of one.It has been shown by that all finitely generated classical Schottky groups have limit sets of Hausdorff dimension bounded above strictly by a universal constant less than 2.