Detailed instructions for working a group puzzle of type 'Jodi'

This is a signature puzzle named 'Jodi'

The 4 elements in each group of this type of puzzle are: J, O, D, and I.

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

Each row is a group numbered as shown in this Jodi figure.

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

Each column is a group numbered as shown in this Jodi figure.

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

Each 2x2 square is a group numbered as shown in this Jodi figure.

In a Jodi puzzle, each 2x2 square is a group numbered as shown in the figure above.