Historical clue formulations

• Attribute — 2021-06-02
• Attribute — 2015-10-19
• Credit (to) — 2015-03-22
• Attribute (to) — 2013-08-05
• Credit — 2013-07-20
• Give credit (to) — 2013-06-17
• Credit — 2011-06-26
• Attribute (to) — 2008-03-09
• Attribute — 2005-12-01
• Attribute — 2005-07-27
• Credit — 2003-10-25
• Impute — 1997-10-26
• Credit — 1994-11-25