Dave is big. Dave is green. Dave is quiet. Dave is red. Dave is rough. Dave is not white. Dave is young. All green, big people are red. All rough, big people are quiet. If Dave is red and Dave is white then Dave is big. If someone is rough and white then they are big. If Dave is not young then Dave is green. All red, big people are green. If Dave is not big then Dave is rough. If someone is white and not big then they are not quiet.
Dave is not young.