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

This is a signature puzzle named 'Garth'

The 5 elements in each group of this type of puzzle are: G, A, R, T, and H.

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

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

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

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

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

Each pentomino is a group numbered as shown in this Garth figure.

In a Garth puzzle, each pentomino is a group numbered as shown in the figure above.