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Reminds me of another Holiday card…
https://www.folger.edu/ciphers-codes-steganography
By William F. and Barbara Friedman https://en.wikipedia.org/wiki/William_F._Friedman
Merry Christmas!
_pi
Posted : December 25, 2018 11:45 pm
Merry Christmas
Posted : December 26, 2018 10:59 am
