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