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