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