Historical clue formulations

• "See ya!" — 2020-11-12
• "Ciao" — 2019-03-14
• "See ya!" — 2013-12-11
• "Ciao!" — 2009-03-14
• "Later!" — 2008-11-28
• "See ya!" — 2007-03-04
• "Later!" — 2004-05-07