= Venn diagram
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A Venn diagram represents <sets> by closed curves, with each region recording a possible pattern of membership. For two <sets>, the regions mean “first only”, “both”, “second only”, and “neither”; the enclosing rectangle can represent the <universal set>. Shading regions displays <union>, <intersection>, <set difference>, or <complement>. In the numbered examples in <set union> and <complement>, positions encode membership, while curve shapes and region areas do not encode <cardinalities>.
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