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

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-7D figure.

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

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

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

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

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