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