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

This is a signature puzzle named 'Sheridan'

The 8 elements in each group of this type of puzzle are: S, H, E, R, I, D, 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 Sheridan figure.

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

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

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

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

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