Historical clue formulations

• Prefix with linear — 2023-11-25
• Straight: Prefix — 2008-10-12
• Prefix with linear — 2001-12-16
• Prefix with linear — 1999-11-09
• Prefix with linear — 1997-12-15
• Prefix with linear — 1997-03-30
• Straight: Prefix — 1996-03-29