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