Includes a -demo option and other ideas from Luis Fernandes' independent program xabacus-1.0 and Sarat Chandran's help from Java code. Now includes help, a Russian abacus, floating point, negatives, quarters, Roman Numerals, Roman Hand Abacus, and Lee's Abacus. Includes a teach mode to teach addition, subtraction, multiplication, division, square root, and cube root. New Medieval Counter recently added.
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