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A comment on Superpermutations. Parent comment

Re:Superpermutations by espeed on Monday October 22, 2018 @03:26PM (#18277552)
NB: I suspect the number you are thinking of is a 2530 digit sequence on a 4-digit lock, not 153 on 5...

https://en.wikipedia.org/wiki/De_Bruijn_sequence#Uses

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