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