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Detailed instructions for working a group puzzle of type 'Sudoku-Cornered'

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The 9 elements in each group of this type of puzzle are: 1, 2, 3, 4, 5, 6, 7, 8, and 9.

Every group in the puzzle must contain exactly this set of elements.

In a Sudoku-Cornered puzzle, each row is a group numbered as shown in the figure above.

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In a Sudoku-Cornered puzzle, each column is a group numbered as shown in the figure above.

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In a Sudoku-Cornered puzzle, each 3x3 square is a group numbered as shown in the figure above.

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In a Sudoku-Cornered puzzle, the top left corners of each 3x3 square are a group and are marked with '1st' in the figure above.

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In a Sudoku-Cornered puzzle, the top right corners of each 3x3 square are a group and are marked with '1st' in the figure above.

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In a Sudoku-Cornered puzzle, the bottom left corners of each 3x3 square are a group and are marked with '1st' in the figure above.

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In a Sudoku-Cornered puzzle, the bottom right corners of each 3x3 square are a group and are marked with '1st' in the figure above.

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