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