Dave is quiet. Gary is cold. Harry is big. If someone is cold and not quiet then they are blue. If someone is not cold then they are big. If someone is quiet and blue then they are not furry. If Harry is cold and Harry is big then Harry is rough. Blue, cold people are rough. If Gary is young and Gary is furry then Gary is big. If Gary is young and Gary is not blue then Gary is big. If someone is not blue and not furry then they are not rough.
Harry is young.