[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
37469 | B9261941
       -B8681
        =====
         3B809
        -37469
         =====
          A6304
         -46990
          =====
           B8141
          -23749
           =====
           ?????

base: 12
letters: 0123456789AB
missing: 5
difficulty: medium