This reminded me of the De Bruijn Sequence card trick. https://sites.math.washington.edu/~billey/classes/562.winter.2018/problem.sets/debruijn.trick.pdf https:

This reminded me of the De Bruijn Sequence card trick. https://sites.math.washington.edu/~billey/classes/562.winter.2018/problem.sets/debruijn.trick.pdf https://sites.math.washington.edu/~billey/classes/562.winter...