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The term "Derived Series" in locksmith terminology refers to a series of blind codes and bittings that are associated with another bitting list. This concept is essential in the field of key management and lock systems, especially when dealing with master keying or creating keys that are derived from a primary list. Essentially, the derived series represents a systematic way to create variations of keys from a base set, allowing for the organization of keys while maintaining security protocols.

This term emphasizes the relationship between different key cuts and how they relate to a specific bitting list, which is critical for locksmiths when designing key systems that require multiple levels of access control. By understanding derived series, locksmiths can effectively manage and differentiate between keys, ensuring that access is granted appropriately without compromising security.

The other terms listed do not specifically encapsulate the concept related to key codes or bittings, making them less relevant in the context of the derived series in locksmith practice. Thus, "A" succinctly captures the essence of what derived series means within the locksmithing field.