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