90CA
      +---------
07846 | 8EF4699B
       -B7CAF
        =====
        36E9A9
       -3127E5
        ======
         9610A9
        -99294A
         ======
          1E3F5B
         -1346EF
          ======
           10694

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