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very difficult sudoku printable Step 6: Apply the "X-Wing" and "Swordfish" Techniques For more advanced solving, learn the "X-Wing" and "Swordfish" strategies. where did sudoku originate It provides a fresh and engaging experience, allowing players to challenge their minds and improve their problem-solving skills. origin of sudoku It is an excellent tool for educational purposes, helping children develop cognitive skills at an early age. There is no need to download any software or apps; you can simply access the website and start playing right away. sudoku levels origin of sudoku def isValidSudoku(board): def is_valid(board, row, col, num): for i in range(9): if board[row][i] == num or board[i][col] == num: return False if board[3 * (row // 3) + i // 3][3 * (col // 3) + i % 3] == num: return False return True for i in range(9): for j in range(9): if board[i][j] != '.': if not is_valid(board, i, j, board[i][j]): return False return True Step 2: Test the function with a sample Sudoku grid.

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