330F
      +---------
2B88A | 605919E7
       -2B88A
        =====
        33A6B9
       - 2B88A
        ======
         458F0E
        -4D491D
         ======
          AEF127
         -A6A997
          ======
           A716C

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: C