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