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