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(lemmy.blahaj.zone)
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Thanks for the answer. My searches on the internet just brought up mathematical graph theory.
It's so cool to see what simple yet clever tricks they used to use. The tricks used today are probably still very clever but definitely no longer simple.
I got the info from this german youtube channel. https://www.youtube.com/watch?v=EydD_IuSVL0
That guy makes quite interesting stuff. Unfortunately, only in German.