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