Bob is young. Charlie is blue. Charlie is furry. Charlie is green. Charlie is quiet. Charlie is red. Charlie is young. Dave is blue. Dave is furry. Dave is green. Dave is quiet. Dave is red. Dave is round. Dave is young. Harry is green. Harry is young. All furry, round people are young. If Charlie is round then Charlie is quiet. Quiet people are furry. Blue people are green. If someone is quiet then they are blue. If Harry is furry and Harry is quiet then Harry is green. All red people are furry. If someone is green then they are quiet.
Dave is not round.