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Answer: The reference letter can be in free form, but as a general rule, the following information must be included:- ・ Enter the letterhead of the office to which professionals such as lawyers or accountants belong. ・ Enter the name, address, phone number, email address, URL, etc. of the professional office. ・ An expert registration number and signature must be signed, and a job seal must be stamped (if any). If you can contact us, we will give you a sample form.