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