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Progressive cognitive training using custom Atbash letter-pair cipher transformations. Atbash Cipher is a tool that inverts all the text on the page. This means A becomes Z, B becomes Y etc. After you practice using this you will be able to read a cipher that your friends and family can't! As you can imagine it would be really hard to start trying to read this right away:"vcznkov gvcg". To help with this I made it so that you can slowly start switching letters to help with the learning curve. I also think this is a very fun brain excersize.
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