Historical clue formulations

• On a need-to-know ____ — 2026-06-29
• Underpinning — 2026-06-08
• Footing — 2023-11-10
• Foundation — 2023-02-02
• Grounds — 2022-08-12
• Foundation — 2019-11-11
• Underpinning — 2016-09-25
• Rationale — 2016-02-28
• Groundwork — 2007-09-05
• Bottom — 2007-01-26
• Foundation — 2006-05-09
• Underlying principle — 2006-03-28
• Amount from which to figure sale profit — 2005-08-31
• Foundation — 2005-02-21
• Groundwork — 2004-06-08
• Foundation — 2003-09-30
• Foundation — 2000-11-24
• Groundwork — 2000-10-16
• Groundwork — 1998-05-10
• Foundation — 1997-02-11
• Foundation — 1995-05-22
• Grounds — 1994-03-07