7FBC
      +---------
854F9 | 91AA331E
       -854F9
        =====
        7D7903
       -709EBE
        ======
          AB8A1
         -47181
          =====
          79936E
         -7610CB
          ======
           828DD

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: 2