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Re:Superpermutations by klodolph on Monday October 22, 2018 @10:52AM (#18275106)
You’re thinking of De Brujin sequences, not superpermutations, unless there’s an additional restriction that a digit cannot be used twice in a password.
Re:Superpermutations by espeed on Monday October 22, 2018 @03:03PM (#18277330)
Yes, and in this case the sequence is specifically the "classic" De Bruijn sequence [1]; however, there are other sequences that bear De Bruin's name, such as the Moser de Bruijn sequence, which is the one I reference most due to its relation to Z-order curves and pairing functions.

[1] https://en.wikipedia.org/wiki/De_Bruijn_sequence

[2] https://en.wikipedia.org/wiki/Moser-de_Bruijn_sequence