| venn diagram -
A diagram representing some sets by contours of closed shapes, such as circles or ellipses and sometimes also the universal set as a rectangle enclosing all of these shapes, and indicating the relationships between the sets: by overlapping the shapes to show that the corresponding sets have a non-empty intersection, and by possibly but not necessarily enclosing all of the sets which are proper subsets of the universal set within a universal set represented typically by a rectangle; such that the total number of simply connected regions is 2^n, where n is the number of depicted sets which are proper subsets of the universal set.
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