Cipher 20: Ulam

It’s difficult to believe that this is the twentieth cp4space cipher. Anyhow, here it is:

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0 Responses to Cipher 20: Ulam

  1. Stuart Gascoigne says:

    I just wanted to thank you for devising the ciphers and, as a relative latecomer to solving them, thank you especially for not subsequently posting any spoilers!

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