Historical clue formulations

• Sound from a ragdoll — 2026-01-11
• [Please keep scratching me!] — 2025-04-11
• Sound of a smooth-running engine — 2025-02-23
• Engine sound — 2024-12-27
• Contented cat's sound — 2024-02-26
• Cat's sound — 2023-02-22
• Sound of a contented cat — 2023-02-06
• Ideal engine sound — 2022-11-27
• Cat's sound of self-relaxation — 2022-10-04
• Sound from a contented cat — 2022-02-01
• Contented cat's sound — 2022-01-24
• Car or cat sound — 2021-03-09
• Speak softly with contentment — 2020-12-19
• Sign of cat love — 2020-03-12
• Reaction to scritches, maybe — 2019-10-13
• Sound of contentment — 2017-04-27
• Engine sound — 2016-11-06
• Engine sound — 2015-09-24
• Respond to a belly rub, say — 2015-05-20
• Contented cat sound — 2014-12-15
• What cats and some engines do — 2014-12-08
• Himalayan production — 2014-03-29
• Result of some heavy petting? — 2013-08-04
• Run smoothly — 2012-08-01
• Say sexily — 2012-06-21
• Copy cats? — 2009-07-04
• Sign of a contented cat — 2009-06-16
• Sound from a sex kitten? — 2006-08-10
• Engine sound — 2006-06-08
• What gentle strokes may produce — 2006-04-12
• Run perfectly — 2005-09-21
• Contented sound — 2005-06-21
• Sound from a Burmese — 2004-04-08
• Say coquettishly — 2003-02-25
• Petted pet's sound — 2002-10-22
• Good engine sound — 2002-10-15
• Run smoothly — 2002-07-20
• Engine sound — 2002-04-05
• Sound of contentment — 2002-02-03
• "I'm happy" in Siamese? — 2001-03-03
• Sound of a tuned engine — 2000-12-19
• Sound of a fine-tuned engine — 1999-12-08
• Persian output — 1999-04-16
• Manx "Thanks!" — 1998-03-01
• Tabby talk — 1998-02-26
• Sound of a cat or engine — 1997-08-25
• Sound of contentment — 1996-08-26
• Result of tummy rubbing? — 1994-08-02
• Contented sound — 1994-07-12
• Rumble of contentment — 1994-03-10