While the experiments show the value of hierarchy , they do not show the value of this particular method of creating hierarchy	['pro', 'pro', 'pro', 'pro', 'pro', 'pro', 'pro', 'pro', 'non', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con', 'con']	paper quality