[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
25435 | 41000953
       -25435
        =====
        884049
       -13B337
        ======
         BB0595
        -831059
         ======
          221513
         -2B3A51
          ======
          ??????

base: 12
letters: 0123456789AB
difficulty: intermediate
missing: 6