Word of the day segregate - "Friedman and the other codebreakers began to segregate the ciphertext letters into cycles representing the rotation of the coding wheels -- gingerly at first, then faster and faster as the evidence accumulated".
http://www.amazon.com/Codebreakers-Comprehensive-History-Communication-Internet-ebook/dp/B001D201IK/ref=sr_1_1?ie=UTF8&qid=1390922603&sr=8-1&keywords=the+code+breakers
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