Dave is blue. Dave is furry. Dave is green. Dave is kind. Dave is rough. Gary is blue. Gary is furry. Gary is kind. Gary is rough. Gary is young. Harry is not blue. Harry is cold. Harry is not furry. Harry is not green. Harry is not rough. All furry people are rough. If Harry is rough and Harry is blue then Harry is cold. Young people are furry. If someone is not blue then they are not furry. If Gary is cold and Gary is blue then Gary is young. If Dave is rough then Dave is young. If someone is blue and not young then they are not cold. If someone is not furry then they are not rough.
Dave is not young.