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