1. Dialogue
Mike: Hey, Min-su! Let me show you something.
Min-su: OK. What is it?
Mike: Write down three numbers in a row.
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 198.
Min-su: Wow. How amazing! How did you know?
Mike: It's a secret.
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