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

This is a signature puzzle named 'Leonidas'

The 8 elements in each group of this type of puzzle are: L, E, O, N, I, D, A, and S.

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

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

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

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

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

Each 4x2 rectangle is a group numbered as shown in this Leonidas figure.

In a Leonidas puzzle, each 4x2 rectangle is a group numbered as shown in the figure above.