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