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