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