Bob is not blue. Bob is nice. Bob is smart. Dave is blue. Dave is nice. Dave is red. Dave is rough. Dave is not round. Dave is smart. Dave is not young. Gary is nice. Gary is rough. All round, smart things are red. If Bob is round then Bob is not smart. If something is not nice then it is rough. If something is rough and not young then it is red. All young things are blue. If Gary is young and Gary is not rough then Gary is round. If something is young and not blue then it is smart. If something is blue and not smart then it is not round.
Bob is young.