Historical clue formulations

• Alphabet run — 2011-05-13
• Middle of a run? — 2001-07-01
• Alphabet quartet — 1997-03-23
• Alphabetic run — 1996-10-08
• K-P interval — 1995-10-04
• Alphabet quartet — 1994-03-14
• Rows before P — 1994-01-18