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This calculator is a solver of cryptarithmetic puzzles. A Cryptarithmetic puzzle is a number puzzle in which a group of arithmetical operations has some or all of its digits replaced by letters or symbols, and where the initial digits must be found. In such a puzzle, each letter represents a unique digit.
In this case, it works with addition; however, with a little bit of common sense, it can be used to solve subtraction puzzles as well :)