Historical clue formulations

• Sheep genus — 2023-09-20
• Sheep's genus — 2012-11-25
• Sheep genus — 2011-04-30
• Sheep genus — 2011-01-29
• Sheep's genus — 2010-06-05
• Sheep's genus — 2007-06-24
• 21-Down's genus — 2004-05-14