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Detailed instructions for working a group puzzle of type 'Sudoku-7B'

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

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

Each row is a group numbered as shown in this Sudoku-7B figure.

In a Sudoku-7B puzzle, each row is a group numbered as shown in the figure above.

Each column is a group numbered as shown in this Sudoku-7B figure.

In a Sudoku-7B puzzle, each column is a group numbered as shown in the figure above.

Each septomino is a group numbered as shown in this Sudoku-7B figure.

In a Sudoku-7B puzzle, each septomino is a group numbered as shown in the figure above.