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