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