Historical clue formulations

• Prefix with type — 2014-01-09
• Start to type? — 2013-12-11
• Prefix with type — 2013-08-13
• Prefix with type — 2011-09-30
• Prefix with -plasm — 2007-06-04
• Prefix with -plasm — 2007-01-16
• First: Prefix — 2005-12-28
• Prefix with type — 2000-10-08
• Typical beginning — 1998-07-10
• First: Prefix — 1998-02-19
• Prefix with type — 1994-08-14