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| ==== The Code Book ==== | ==== The Code Book ==== | ||
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| [[reading notes]] on 'the code book' by simon singh, 1999. isbn 0-385-49532-3 | [[reading notes]] on 'the code book' by simon singh, 1999. isbn 0-385-49532-3 | ||
| - | === the cipher challenge === | + | ==== the cipher challenge ==== |
| * the challenge http:// | * the challenge http:// | ||