Historical clue formulations

• Diamond edges? — 2026-06-27
• Dead ends? — 2025-11-28
• Odd pair? — 2025-07-06
• Average killers? — 2025-03-30
• Middle's middle — 2024-09-27
• Edges of a diamond? — 2023-02-03
• Defend borders? — 2022-09-15
• Old-fashioned endings? — 2021-09-11
• Poor grades — 2021-05-24
• Diamond brackets? — 2019-09-08
• Middle's middle? — 2016-03-15
• Two of diamonds? — 2015-08-18
• Odd couple? — 2014-10-23
• Barely passing grades — 2013-09-03
• Couple of buddies? — 2012-09-16
• Pretty low grades — 2011-04-27
• *Poor grades — 2011-01-18
• Subpar grades — 2010-10-31
• Dead ends? — 2010-09-26
• Wedding couple? — 2010-03-12
• Rick with the 1976 #1 hit "Disco Duck" — 2009-08-06
• Almost-failing grades — 2009-04-13
• Low grades — 2008-12-16
• They're worth 1.0 — 2008-06-11
• G.P.A. spoilers — 2007-04-22
• Honor society no-nos — 2006-12-07
• G.P.A. spoilers — 2006-10-08
• Radio Hall-of-Famer Rick — 2006-05-19
• Poor marks — 2006-04-08
• Barely passing grades — 2004-12-02
• Crummy grades — 2004-11-23
• Scrabble 2-pointers — 2004-02-21
• Bad marks — 2004-02-20
• Stinky grades — 2003-08-06
• Bad marks — 2002-11-30
• Fiddle duet? — 2002-08-17
• Detached ends? — 2002-01-10
• Two of diamonds? — 2001-10-05
• Odd couple? — 2001-08-08
• Rick who sang "Disco Duck" — 2001-01-30
• Ruby and Sandra — 2000-12-12
• Reason for school probation, maybe — 2000-06-01
• Poor marks — 2000-05-21
• G.P.A. spoilers — 1999-12-12
• Poor grades — 1999-10-26
• Odd couple? — 1999-05-15
• Low marks — 1999-05-13
• Two Scottish rivers — 1998-08-06
• Barely passing grades — 1997-09-29
• School passes? — 1996-12-21