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  • $\begingroup$ I was able to improve this by 1 just now. $\endgroup$
    – RobPratt
    Commented Jul 27, 2020 at 4:02
  • $\begingroup$ Wow cool! Your solution looks quite different though. I am guessing you initialized your variables with my solution first and then ran your optimization? $\endgroup$ Commented Jul 27, 2020 at 4:34
  • $\begingroup$ Yes, one of my improvement heuristics for a given solution is to fix all occurrences of a subset of digits and optimize the rest. $\endgroup$
    – RobPratt
    Commented Jul 27, 2020 at 4:43