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He used them in his studies of logic.
No country was ever a Venn diagram.
Named after John Venn, a British logician (1834-1923), the Venn Diagram is commonly used to portray sets and their relationships. Using intersecting circles and other geometric shapes, they help in conceptualizing logical relationships, such as syllogisms.See: venn-diagram
He created the "Venn diagram" which is used when dealing with "sets" in mathematics.
No a venn diagram is not a graphic source.