Mike: Hey, Min-su! Let me show you something.
Min-su: OK. What is it?
Mike: Write down three numbers ⓐ 연속하여.
Min-su: Go ahead. I’m ready.
Mike: Write down the same three numbers backwards. Subtract the smaller number from the bigger number.
Min-su: OK. I did.
Mike: The answer is ⓑ
Min-su: Wow. How amazing! How did you know?
Mike: It’s a secret.