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

This is a signature puzzle named 'Marcos'

The 6 elements in each group of this type of puzzle are: M, A, R, C, O, and S.

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

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

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

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

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

Each 3x2 rectangle is a group numbered as shown in this Marcos figure.

In a Marcos puzzle, each 3x2 rectangle is a group numbered as shown in the figure above.