[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
22248 | 726B9B7A
       -997C8
        =====
         BA33B
        -BBB88
         =====
          D5007
         -11178
          =====
           A371A
          -66AD5
           =====
           ?????

base: 14
letters: 0123456789ABCD
difficulty: hard