Dave is red. Harry is rough. If someone is smart and not quiet then they are not nice. If someone is red and not quiet then they are not blue. If Dave is red then Dave is cold. All cold, rough people are not quiet. If someone is red then they are cold. If someone is not blue then they are red. If Dave is not red then Dave is not smart. If someone is smart and not red then they are rough.
Harry is quiet.