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