Historical clue formulations

• Theoretically — 2019-11-19
• In theory — 2016-11-24
• Theoretically, at least — 2015-06-14
• Theoretically — 2012-09-19
• In theory — 2010-03-11
• Not oral — 2007-06-17
• Conjecturally — 2005-05-14
• Not necessarily real — 2004-02-06
• Theoretically — 2001-05-25
• Theoretically — 1999-11-19