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This was a code key, not a codified message, so there was nothing to break, but only the indication that messages could have been exchanged using this key.

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Which is gold material for the code breakers. The people trying to decrypt messages having to do with the ongoing war at the time.

Yes but if the codebreakers also came across a (real!) coded message, wouldn't they want to have the key already to hand so that it can be decrypted?

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