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