Venn diagram

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Writer-Sorceror Roger Zelazny (working with Artist-Engineer William Blake) conjures a Venn diagram against an unnamed Demon.

A Venn diagram is a machine (nonfiction) for detecting and repelling demons (nonfiction).

In addition, Venn diagrams show all possible logical relations between a finite collection of different sets; see Venn diagram (nonfiction).

Writer/sorceror Roger Zelazny is famous for using Venn diagrams to trap demons.

He frequently then hypnotizes the demons and makes them perform embarrassing tricks in front of live audiences.

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