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