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