Historical clue formulations

• Comprehension — 2022-07-07
• Slow on the ___ — 2020-06-29
• Comprehension — 2020-01-19
• Slow on the ___ — 2018-07-03
• Absorption — 2014-05-06
• Slow on the ___ — 2009-03-03
• Mental grasp — 2007-08-21
• Comprehension — 2002-11-24
• Understanding — 2001-06-13
• Mental grasp — 1999-04-18
• Slow on the ___ (thickheaded) — 1998-03-10