Historical clue formulations

• Kind of diagram with overlapping circles — 2026-09-28
• ___ diagram — 2025-04-10
• Kind of diagram — 2023-08-22
• Kind of diagram — 2023-08-03
• John who was a pioneer in set theory — 2023-01-07
• Kind of diagram — 2022-09-18
• Kind of diagram that the Mastercard logo resembles — 2022-01-04
• ___ diagram — 2018-07-01
• Kind of diagram — 2018-04-11
• Kind of diagram — 2017-08-20
• ___ diagram — 2016-08-08
• ___ diagram — 2015-12-27
• ___ diagram (logic illustration) — 2011-09-14
• ___ diagram (logic tool) — 2011-08-08
• A diagram bears his name — 2010-01-29
• ___ diagram — 2008-12-07
• Kind of diagram in logic — 2006-07-16
• ___ diagram — 2005-02-06