Historical clue formulations

• K-O connector — 2016-04-25
• Three after K — 2012-09-05
• Run after K — 2012-01-19
• Trio between K and O — 2012-01-02
• KO connection? — 2011-11-05
• Trio after K — 2008-03-17
• KO insert? — 2005-08-14
• O lead-in — 2003-12-26
• K-O connection — 2001-02-06
• Letter run — 2000-05-27
• K-O connection — 2000-02-01
• K-O filler — 1999-10-10
• Alphabetic sequence — 1997-11-26
• K-O bridge — 1997-10-01
• K-O connector — 1996-09-17
• Alphabet chain — 1996-08-01
• Alphabet string — 1996-02-25
• Alphabet run — 1995-12-03
• K-O bridge — 1995-06-07
• K-O string — 1995-05-10
• Alphabet trio — 1995-03-17
• K-O interval — 1993-12-05