Historical clue formulations

• Ninja's quality — 2026-08-03
• Sneakiness — 2026-07-08
• Secrecy — 2026-01-07
• Ninja's quality — 2025-12-31
• Furtiveness — 2025-07-20
• Ninja's forte — 2024-04-10
• What lions use to hunt — 2023-09-24
• Kind of technology in some modern military aircraft — 2022-08-15
• Sneakiness — 2021-10-13
• Ninja's asset — 2019-09-07
• Covertness — 2018-07-30
• Good hunting skill — 2017-12-31
• Like the B-2 bomber — 2007-03-20
• Cat burglar's need — 2005-09-16
• Hugger-muggery — 1998-02-13
• Kind of bomber — 1996-07-07
• Kind of fighter — 1995-10-21
• Bomber type — 1994-05-11
• Hugger-muggery — 1994-02-26