| http://www.w3.org/ns/prov#value | - A method of automatically sending a reminder from a sender of a mail item to the addressee of the mail item, the addressee having an obligation to return a sealed reply envelope by a given due date, the method including an operation of sending a reminder letter to the address of the addressee only if a unique reply code that is affixed to the reply envelope and that is read by automatic input mean
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