character: Polish Cipher Bureau
topic: Contributions to the Breaking of Enigma Codes
grade: 9
subject: Computer Science
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character: Marian Rejewski
topic: Mathematician who first broke the Enigma code
grade: 9
subject: Computer Science
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character: Jerzy Różycki
topic: Mathematician and cryptologist involved in the Enigma project
grade: 9
subject: Computer Science
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character: Henryk Zygalski
topic: Developed the Zygalski sheets for breaking Enigma codes
grade: 9
subject: Computer Science
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