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