[error] DEADLOCK/NODUP: no remaining values
       ??????
     +-------
8068 | 1A7640
      -9A47
       ====
       83814
      - A590
       =====
        81350
       -8710A
        =====
        ?????

base: 11
letters: 0123456789A
difficulty: hard
hints: 0 << 5
missing: 2