Anne is young. Bob is blue. Bob is rough. Dave is blue. Dave is quiet. Dave is young. Gary is white. If Anne is smart and Anne is quiet then Anne is blue. If someone is blue and not young then they are round. If Dave is round and Dave is young then Dave is blue. If someone is smart then they are not rough. If Bob is smart then Bob is not young. If Dave is blue and Dave is round then Dave is rough. If someone is round and not rough then they are white. If someone is not round and not young then they are white.
Bob is not blue.