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