The letter M in IMRD refers to。

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• 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 .
• When letter”t” meets letter”y”, they can be read together asd?。