character: Marian Rejewski
topic: Contributions to Enigma code breaking
grade: 9
subject: Computer Science
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character: Alan Turing
topic: Mathematician and computer scientist who advanced code breaking techniques
grade: 9
subject: Computer Science
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character: Józef Pegaz
topic: Mathematician involved in early code breaking efforts in Poland
grade: 9
subject: Computer Science
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character: Gregory P. McCarty
topic: Expert in cryptography and its historical significance
grade: 9
subject: Computer Science
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