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Each Irregular Sudoku puzzle consists of a 6x6, 9x9 or 12x12 grid containing given clues in various places. The object is to fill all empty squares so that the numbers 1 to 6 (for 6x6 puzzles) or 1 to 9 (for 9x9 puzzles) or 1 to 12 (for 12x12 puzzles) appear exactly once in each row, column and irregular shaped box.
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