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