[error] DEADLOCK/NODUP: no remaining values
[error] DEADLOCK/NODUP: no remaining values
       ??????
     +-------
5721 | 435233
      -5721
       ====
       53473
      -581A2
       =====
        59403
       -5313A
        =====
        ?????

base: 11
letters: 0123456789A
difficulty: hard
missing: 6