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