Question: Gabe has a new school combination lock for his locker. His lock will only open with the correct four-letter code. The mechanism of his lock

Gabe has a new school combination lock for his locker. His lock will only open with the correct four-letter code. The mechanism of his lock consists of wheels that rotate through the letters A to L. The lock can only use each letter once in a code. How many different codes are possible when repetition is not allowed?

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