The SIGABA was a highly secure encryption machine used by the US for strategic communications in WWII. As in the first five parts of this series of challenges, you are provided with a partial known-plaintext. However, in this part you get no information about the key.
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Although I was first to solve this, Dr Lasry was of course unable to compete against his own challenge and I should acknowledge that he has solved full-size Sigaba challenges equivalent to this that I have provided him. Hence he was in fact first to solve such a challenge.

Jerva