![](https://scienceblogs.de/klausis-krypto-kolumne/files/2021/02/Cipherbrain-Visual.png)
On a Russian website a handwritten notebook from the Soviet era is described. Its content is encrypted. Can a reader solve this unusual cryptogram?
On a Russian website a handwritten notebook from the Soviet era is described. Its content is encrypted. Can a reader solve this unusual cryptogram?
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