Erin is big. Erin is high. Bob is little. Bob is small. Alan is clever. Charlie is dull. Charlie is bad. If someone is not huge then they are dull. If someone is not poor then they are wealthy. If someone is clever then they are smart. If someone is smart and not rough then they are kind. If someone is dull and not huge then they are sad. All sad people are thin. If someone is little and small then they are rough. If someone is rough and not smart then they are bad. If someone is bad then they are young. If someone is wealthy then they are nice. All nice people are quiet. All kind people are experienced. 
Erin is not thin.