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How to write a letter to a building without an office?

1, the first title. Writing organ+reason+genre.

2. Second, the text. The body of a letter generally includes two levels, which solves the two problems of "why to send a letter" and "the main content of a letter".

3. The final outcome. Different types of letters have different endings. Generally, it is "hereby notified"; "This letter, looking forward to reply" and so on.