CAD4
      +---------
CF4EA | B352F0BD
       -CF4EA
        =====
        CF1510
       -C5217C
        ======
         CED3BB
        -C99442
         ======
          C797CD
         -C3480B
          ======
            F341

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: 6