Historical clue formulations

• Optimistic — 2023-05-18
• Buoyant — 2021-09-08
• Positive — 2011-09-21
• Optimistic — 2010-02-22
• Optimistic — 2010-02-07
• Optimistic — 2008-01-14
• Optimistic — 2006-06-13
• Optimistic — 2002-10-14
• In high spirits — 2001-06-12
• Cheery — 2000-06-25
• Optimistic — 1998-07-31