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