Mathdoku is a mathematical and logical puzzle loosely similar to sudoku.
It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that:
Each row contains exactly one of each digit.
Each column contains exactly one of each digit.
Each bold-outlined group of cells (block) contains digits which achieve the specified result using the specified mathematical operation: addition (+), subtraction (-), multiplication (×), and division (÷).
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