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In the context of Venn diagrams, the universe is not everything, but everything you're dealing with right now. Let's deal with the following list of things: moles, swans, rabid skunks, geese, worms, horses, Edmontosorum (a variety of duck-billed dinosaurs), platypusses, and a very fat cat.
In order theory, a Hasse diagram is a type of mathematical diagram used to represent a finite partially ordered set, in the form of a drawing of its transitive reduction. Concretely, for a partially ordered set one represents each element of S as a vertex in the plane and draws a line segment or curve that goes upward from x to y whenever y covers x. These curves may cross each other but must not touch any vertices other than their endpoints. Such a diagram, with labeled vertices, uniquely deter