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