Historical clue formulations

• Used-up crayons — 2026-03-08
• Pencil remnants — 2022-03-30
• Barely usable pencils — 2022-02-13
• Small lumps — 2021-01-05
• Gists — 2017-04-02
• Gists — 2010-10-03
• Worn-down pencils, say — 2009-12-05
• Lumps — 2009-10-17
• Central parts — 2006-11-02
• Central points — 2003-01-05
• Hearts — 2002-10-27
• Gists — 2002-07-28
• Gists — 2000-01-06
• Gists — 1994-07-10