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While working in breaking the German codes in the 1930's, the Polish Cipher Bureau received help from Hans-Thilo Schmidt, an employee at the German Cipher Bureau who spied for the French military inteligence and gave them the instructions on how to use the German enigma machines. WI that guy's spy role is early detected or, easier, he just doesn't get the job?
That will not stop the Allies from eventually breaking the German codes (unless we fill the thread with another several PODs, of course) but it will delay it for a long time. So, WI the British can't decode the German codes until, let's say, 1943? Which are the effects of WWII?
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