Enter a clue or pattern or both:
The Clue
P.O. abbr. (3 letter answer)
The Answer
PPD
Tags
Notes
The answer PPD is rarely seen, appearing only about once every 1300 puzzles.
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Shipping letters
Mail order abbr.
Mail-order abbr.
Shipment notation: Abbr.
Stamp on some pkgs.
Abbr. in a mail-order ad
One way to send merchandise: Abbr.