[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
61475 | 4B570534
       -81762
        =====
         44345
        -81762
         =====
         B23AA3
        -B6379A
         ======
          B7A694
         -B79925
          ======
          ??????

base: 12
letters: 0123456789AB
difficulty: hard