| 摘要 |
A return mailer type business form has a top ply through which outgoing address information is visible, and a second ply with a reply address printed on its back. The back of the second ply is covered by a removable third ply when used as an outgoing mailer. After receipt by the addressee, the first ply is detached along a perforation line on the first face, and a flap on the second ply is folded about a score line to close the reply envelope formed by the remaining part of the top ply and the second ply, and to cover any further outgoing address information visible by viewing the first ply. The outgoing address information may be printed on the second ply and visible through a window in the first ply, or may be printed on the first ply.
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