Historical clue formulations

• After-afterthought, for short — 2026-03-06
• Afterthought's afterthought: Abbr. — 2025-05-21
• "Also also ...," for short — 2024-10-24
• Here's even more: Abbr. — 2022-10-15
• Letters that further extend letters — 2021-10-30
• Second addendum to a letter, for short — 2018-12-04
• "Another thing I forgot to mention ...": Abbr. — 2018-08-03
• Certain letter addendum, for short — 2018-04-06
• Additional afterthought, for short — 2017-10-10
• And another thing, on a letter — 2017-02-01
• After-afterthought on a letter: Abbr. — 2014-03-26
• Letter addendum, for short — 2011-11-24
• Second afterthought in a letter: Abbr. — 2010-03-02
• Second ltr. addendum — 2007-03-07
• Letter abbr. — 2006-07-07
• Later afterthought: Abbr. — 2004-09-09
• Letter ender? — 2004-03-28
• Second letter addendum: Abbr. — 2003-10-07
• Second ltr. addition — 2002-10-13
• Letter abbr. — 2000-08-30
• Ltr. addendum — 2000-04-07
• Second letter addendum — 2000-01-27
• Epistle appendage: Abbr. — 1999-11-11
• Second addendum to a letter: Abbr. — 1998-11-30
• After-afterthought — 1995-12-15
• Letter ender, for short — 1995-01-08