Historical clue formulations

• "Toodle-oo!" — 2026-06-09
• "Ta-ta!" — 2022-05-17
• "See ya!" — 2019-02-14
• "So long" — 2018-05-31
• "See ya!" — 2017-06-11
• "Toodles!" — 2016-08-09
• "Ta-ta" — 2011-07-07
• "See ya later" — 2010-08-30
• "Later!" — 2009-12-05
• "See ya!" — 2007-11-02
• "Later" — 2002-01-25