[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
9D144 | 60C5EE89
       -2F44C
        =====
        9AD78E
       - 8CFF6
        ======
         9F5C08
        -96B149
         ======
          9C03D9
         -9E9B45
          ======
          ??????

base: 16
letters: 0123456789ABCDEF
difficulty: hard