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Blank White Paper
Every morning, Xiao Li receives a letter in the mailbox at his doorstep. For seven consecutive days, he opens the letter, only to find a blank sheet of paper with no writing inside. On the eighth day, he suddenly calls the police. When the police arrive, they immediately arrest a person. Why did Xiao Li call the police? And how did the police know who to arrest?
Every morning, Xiao Li receives a letter in the mailbox at his doorstep. For seven consecutive days, he opens the letter, only to find a blank sheet of paper with no writing inside. On the eighth day, he suddenly calls the police. When the police arrive, they immediately arrest a person. Why did Xiao Li call the police? And how did the police know who to arrest?

Is the letter Xiao Li received an ordinary letter?
Is the letter Xiao Li received an ordinary letter?