Alan is big. Alan is strong. Gary is thin. Gary is short. Bob is wealthy. Harry is bad. Harry is dull. If someone is not high then they are bad. If someone is not sad then they are kind. If someone is wealthy then they are nice. If someone is nice and not poor then they are smart. If someone is bad and not high then they are rough. If someone is thin and short then they are poor. If someone is poor and not nice then they are dull. All kind people are quiet. 
Gary is not dull.