This program displays Venn diagrams. Expressions are constructed from the sets, A, B, C, S (universal set), and E (empty set), and the four operations, U (union), ^ (intersection), - (relative complement), and ' (complement). There are two games in this program: find the number, and find the region. The user can ask questions, using set notation, to obtain clues as to what the number or region is.Sample expressions are provided.

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