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In page Patricia Bartley:

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The difficulty lay in the encipherment of these code books, using a table 10,000 lines long, which gave 25,000,000 different possibilities for enciphering each code group. To make matters even more complicated, the encyphering process did not use single lines from the table, but two different lines combined, and the two lines used changed every two days. This system had been introduced by the Germans after World War 1, following the successful British decyption of the Zimmermann Telegram. It was reckoned to be impossible to crack and in fact the British had given up collecting traffic to analyse before 1939.[citation needed]