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half-adder

initial budget; original budget

calculator with algebraic logic

obtaining the respective numbers of cranes and tortoises from the total of their heads and legs; calculating the values of two unknown quantities from their unit total and the total of one of their attributes

votive tablet depicting a math puzzle given in devotion to a shrine or temple by a wasan mathematician

longevity celebration (on one's 40th, 50th, 60th, etc. birthday)

calculator

calculator

auto recalculation

equivalence operation; IF-AND-ONLY-IF operation; IFF