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

This is a signature puzzle named 'Theo'

The 4 elements in each group of this type of puzzle are: T, H, E, and O.

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

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

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

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

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

Each 2x2 square is a group numbered as shown in this Theo figure.

In a Theo puzzle, each 2x2 square is a group numbered as shown in the figure above.