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