6819
      +---------
F6DEE | 9D2F26EB
       -F6DEE
        =====
        6596C6
       -68C46A
        ======
         6B836E
        -67DC00
         ======
           30E9B
          -3B388
           =====
            17D0

base: 16
letters: 0123456789ABCDEF
difficulty: medium
missing: 1