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