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Related Clues:
- Afterthought #2
- 25 Across, for one: Abbr.
- Forgetful writer's letters?
- Second second thoughts initially
- SASE, e.g
- Envelope abbr
- Check included with a ltr., e.g
- Bus. letter notation
- Letter addendum, for short
- Letter extender
- S.A.S.E., for one
- Env. addition
- End-of-letter abbr
- Business letter abbr
- Insert of a sort: Abbr