Historical clue formulations

• Milk: Prefix — 2010-03-25
• Opening for milk? — 2009-03-21
• Milk: Prefix — 2003-10-05
• Milk: Prefix — 2001-08-08
• Milk: Prefix — 1999-03-12
• Milk: Prefix — 1998-10-08
• Dairy prefix — 1996-07-20
• Milk: Prefix — 1995-01-29