????????
      +---------
5CB49 | 83C242C6
       -5CB49
        =====
        15B332
       -171818
        ======
         19753C
        -124AD6
         ======
          1C2836
         -171818
          ======
          ??????

base: 14
letters: 0123456789ABCD
difficulty: medium
missing: 0