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A Grand Master Key is designed to operate two or more groups of locks, allowing one key to access multiple lock systems that are grouped together. This system is particularly useful in large buildings or facilities where different areas are secured by separate locks but require a single entity, such as maintenance staff or security personnel, to have access to all areas without the need for multiple keys.

This design enables a hierarchical keying system, where the Grand Master Key can open all locks in the designated groups while individual keys may only access specific locks within those groups. This is a common practice in settings like hotels, office buildings, or schools, facilitating ease of access and management while maintaining security.

Options indicating operation of just one lock, only electronic locks, or keys of different lengths do not capture the broader, grouped access purpose of a Grand Master Key, which is integral to its functionality.