David appears to use CaRMetal https://en.m.wikipedia.org/wiki/CaRMetal CaRMetal ... | Hacker News

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emacsgifs on Oct 27, 2017 | parent | context | favorite | on: David Eppstein's Wikipedia Gallery Contributions

David appears to use CaRMetal

https://en.m.wikipedia.org/wiki/CaRMetal CaRMetal - Wikipedia

BTW, even if that's not the case, I've found CaRMetal exceptionally useful for drawing similar constructions.

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