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