Historical clue formulations

• "Come on in!" — 2021-06-29
• "Come in!" — 2019-08-24
• Response to a knock — 2018-07-27
• "Come on in!" — 2018-02-11
• "Come on in!" — 2012-05-29
• "Come on in!" — 2009-12-06
• Shout after a knock — 2008-09-26
• "Come on in!" — 2007-04-03
• "Come on in" — 2006-11-30
• Answer to a knock — 2005-03-23
• "Walk right in!" — 2003-12-12
• Response to a knock, perhaps — 2003-11-21
• "Come on in!" — 2000-05-24