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SUDOKU

The classic Sudoku game involves a grid of 81 squares.
The grid is divided into nine blocks, each containing nine squares.

The rules of the game are simple:
-Each of the nine blocks has to contain all the numbers 1-9 within its squares.
-Each number can only appear once in a row, column or box.

The difficulty lies in that each vertical nine-square column, or horizontal nine-square line across, within the larger square, must also contain the numbers 1-9, without repetition or omission.

Every puzzle has just one correct solution.