Historical clue formulations

• Kosher — 2024-05-19
• Not against the rules — 2022-03-06
• Fair game — 2019-08-10
• Permitted — 2015-02-02
• Licit — 2014-09-24
• Licit — 2007-09-05
• Legal — 2006-12-03
• Conceded — 1995-10-17
• Permissible — 1995-03-05