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Cistercian Numbering

Just a fun little toy I made based on this tweet I saw about an ancient number cipher https://twitter.com/MathematicsUCL/status/1356558846093914114

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You may enjoy this recent Numberphile video with Alex Bellos:

Another notebook also popped up, by Ramona Sharples:

Ahahah I guess more than one of us got the same idea.