Historical clue formulations

• Transition points — 2025-12-28
• Edges — 2025-08-09
• Thresholds — 2025-06-29
• Inflection points — 2024-08-05
• Borders — 2021-02-20
• Molars usually have four of these — 2016-10-24
• Zodiac borders — 2013-03-20
• Canine features — 2008-11-01
• Points on a crescent moon — 2007-10-11
• Thresholds — 2006-09-09
• Crescent features — 1997-05-11
• Architectural decorations — 1996-04-21