It isn't a permutation, but I suspect you can swap between them with y/0-9/9876543210/ and that it is the lexicographically last shortest solution. (:

                - tye

In reply to Re^4: Shortest string containing all from 0000 to 9999 challenge. (how many?) by tye
in thread Shortest string containing all from 0000 to 9999 challenge. by EvdB

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