Charlie is rough. Dave is blue. White, young things are rough. If Charlie is young and Charlie is white then Charlie is round. All young things are smart. If something is furry then it is not rough. If something is smart and not round then it is not blue. If something is blue and not smart then it is furry. If something is smart and not round then it is not white. If something is white and not smart then it is not blue.
Dave is round.