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The game was quite a simple one.
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Every single German message, every surprise attack,
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every bombing run, every imminent U-boat assault...
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They were all floating through the air.
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Radio signals that...
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well, any schoolboy with an AM kit could intercept.
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The trick was that they were encrypted.
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There were 159 million million million possible
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Enigma settings.
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All we had to do was try each one.
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But if we had ten men checking one setting a minute
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for 24 hours every day and seven days every week,