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