There are “Your ref” and “Our ref”, which are codes assigned to the letter by the recipient and sender of the letter.

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• The letter M in IMRD refers to。
• An invitation letter is a kind of social letter，it is divided into formal invitation and informal invitation.。
• Dear John letter is a letter written from a male to a female.。
• The letter of marriage serves as the marriage certificate.
• He glanced at the letter and then threw it into the bin .