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

This is a signature puzzle named 'Greta'

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

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

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

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

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

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

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

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