Dave is blue. Dave is furry. Dave is not green. Dave is not quiet. Dave is rough. Dave is smart. Dave is young. Gary is furry. Harry is blue. Harry is green. Harry is quiet. Harry is smart. If something is young and not blue then it is not quiet. If something is blue and not quiet then it is not green. Young, quiet things are not green. If something is not blue then it is smart. If something is furry and blue then it is rough. If something is smart then it is rough.
Harry is young.