| 摘要 |
The present invention provides envelope structures that can be used for delivering correspondence from a sender to a recipient in a way that easily and efficiently allows the recipient to return at least a portion of the correspondence to the sender. An exemplary envelope structure in accordance with the present invention comprises a first envelope having a body portion and a flap portion and a second envelope separably integrated with the first envelope. The envelope structure is designed so that a body portion of the second envelope is separable from the body portion of the first envelope and a flap portion of the second envelope is separable from the flap portion of the first envelope.
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