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