Historical clue formulations

• Rare blood type, in brief — 2025-05-28
• Uncommon blood type, for short — 2022-12-30
• Rare blood type, for short — 2016-11-16
• Rare blood type, for short — 2015-08-14
• Rare blood type, for short — 2014-06-14
• Uncommon blood type, informally — 2008-11-09