[error] DEADLOCK/NODUP: no remaining values
            34E0
      +---------
AF68E | 51D71E26
       -68D47
        =====
        8D920E
       -8928AB
        ======
         AD0C32
        -A43DB8
         ======
          4DBA06
         -487C81
          ======
           CE8FC

base: 16
letters: 0123456789ABCDEF
difficulty: challenging