AE1E
      +---------
88386 | 2409E721
       -88386
        =====
        4F1A37
       -4ED753
        ======
         4197D2
        -49E676
         ======
          47FB11
         -4ED753
          ======
            FCCF

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