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