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

This is a signature puzzle named 'Dorian'

The 6 elements in each group of this type of puzzle are: D, O, R, I, A, and N.

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

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

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

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

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

Each 3x2 rectangle is a group numbered as shown in this Dorian figure.

In a Dorian puzzle, each 3x2 rectangle is a group numbered as shown in the figure above.