[error] DEADLOCK/NODUP: no remaining values
        2959
    +-------
639 | 357583
     -803
      ===
      6845
     -6418
      ====
       6308
      -6824
       ====
        6243
       -6418
        ====
          36

base: 11
letters: 0123456789A
difficulty: medium
missing: A