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Comment by etc-hosts | Hacker News Reader

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This article explains a theory of how yupana worked

http://www.mathematicsmagazine.com/Articles/Yupana.php

Thanks! we've changed the link to that from https://cacm.acm.org/blogcacm/technical-marvels-part-3-the-y... above.

Thank you for posting an article worth reading :)

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