Historical clue formulations

• Backspaces over — 2024-04-29
• X's — 2020-01-19
• Expunges — 2019-12-01
• Files away? — 2018-01-20
• Kills — 2010-05-14
• Strikes — 2009-07-10
• Redlines — 2008-07-23
• Strikes — 2007-08-18
• Strikes out — 2003-06-09
• X's — 1994-07-30