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