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