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