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