Historical clue formulations

• Poisonous snake — 2015-10-18
• Deadly snake — 2003-06-01
• Deadly snake — 2000-02-23
• Venomous cobra — 2000-01-16
• Venomous snake — 1997-08-01
• Deadly reptile — 1994-03-04
• Poisonous Asian snake — 1993-11-25