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