Bob is blue. Bob is not furry. Bob is green. Bob is quiet. Bob is rough. Bob is young. Dave is furry. Dave is green. Dave is quiet. Dave is rough. Gary is not blue. Gary is furry. Gary is not green. Gary is not rough. Gary is round. Gary is young. If someone is not green then they are not rough. Blue people are round. All furry, rough people are blue.
Dave is not young.