Enter a clue or pattern or both:
The Clue
Sgts. and lts. get mail at them (4 letter answer)
The Answer
APOS
Tags
Notes
The answer APOS is uncommon, appearing about once every 500 puzzles.
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Overseas addresses for G.I.'s
Possessive mark: Abbr.
Common blood type: Abbr.
Second-commonest blood type: Abbr.