Anne is blue. Anne is green. Bob is quiet. Bob is round. Dave is green. Dave is red. Dave is young. If someone is not red then they are young. Blue, young people are not round. All red, smart people are green. If someone is blue then they are not round. If someone is smart then they are round. If someone is not blue then they are smart. If someone is blue and not round then they are quiet. If someone is not quiet and not round then they are not young.
Bob is young.