Charlie's letter was checked, and it was only allowed to be sent to Hogwarts after reading and checking. In the letter, it seemed that he was just talking about family matters, expressing his nostalgia for his student days, but he was actually revealing a message cryptically.

"What do you think that means?" said Fred, pointing to the letter.

George half-lyed on the sofa in the common room, shaking the letter in his hand and said, "This is definitely not a simple letter, this kind of homely content, Charlie sends it home and reports it to his mother."

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