[error] DEADLOCK/NODUP: no remaining values
            84A4
      +---------
67306 | 1770B274
       -67306
        =====
        C45782
       -CABA8A
        ======
         C86707
        -096C59
         ======
          C4A5C4
         -CABA8A
          ======
           CC20C

base: 13
letters: 0123456789ABC
difficulty: intermediate
restrictions: no multiplication