C71E
      +---------
905F2 | E98CFA7F
       -905F2
        =====
        CB838A
       -CCD1C6
        ======
         9B51A7
        -9BB296
         ======
           1EF7F
          -33876
           =====
            226F

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: 4