| CPC H04L 51/08 (2013.01) | 12 Claims |

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1. An information processing device comprising:
a processor configured to:
accept a designation of a message which is a designated message, and present a document used by a user within a period determined from a time when at least one of the designated message or a related message related to the designated message has been transmitted, as a document related to the designated message, and in a case where the related message has been transmitted earlier than the designated message, the period starts after a time when the related message has been transmitted, and in a case where the related message has been transmitted later than the designated message, the period ends before the time when the related message has been transmitted.
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