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Venn rule
(media.beige.party)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
this is a Euler diagram, not a Venn diagram.
All Venns are Eulers, not all Eulers are Venns.
Venn diagrams have to show an intersection (overlap) of how all combinations overlap.
If there's a possible combination that could exist, but does not - it's not a Venn.
Something that looks like the Olympic rings is not a Venn diagram because the ring on one end isn't connected to the ring on the other end.
counterpoint: "Euler Ruler"