221. One person is a truth-teller, the other is a liar. Find at least one question that you need to ask each of them so that they give the same answer.
$\triangle$ Here the question should relate to the essence of these people. For example, you can ask both: "Are you a truth-teller or a liar?" Both the truth-teller and the liar will answer: “Truth-teller”.

Answer: for example, "Are you a truth-teller or a liar?".
