[error] DEADLOCK/NODUP: no remaining values
[error] DEADLOCK/NODUP: no remaining values
[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
86CC2 | 70137517
       -78BB5
        =====
         C11A5
        -86CC2
         =====
          27281
         -97248
          =====
          1AA957
         -175C9C
          ======
          ??????

base: 13
letters: 0123456789ABC
difficulty: medium