Venn diagram
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![](/w/images/thumb/1/11/William_Blake_-_Sconfitta_-_Frontispiece_to_The_Song_of_Los.jpg/300px-William_Blake_-_Sconfitta_-_Frontispiece_to_The_Song_of_Los.jpg)
Zelazny (working with William Blake (nonficition)) conjures a Venn diagram.
A Venn diagram is a method of warding off demons (nonfiction).
In addition, Venn diagrams show all possible logical relations between a finite collection of different sets (see Venn diagram (nonfiction)).
Roger Zelazny
Writer/sorceror Roger Zelazny is notorious for using Venn diagrams to trap demons.
He then hypnotizes the demons and makes them perform embarrassing tricks in front of live audiences.