B428
      +---------
14A22 | 5377E50E
       -14A22
        =====
        6BD315
       -6C542B
        ======
         B22030
        -BC2D66
         ======
          BA19BE
         -B15799
          ======
           93438

base: 15
letters: 0123456789ABCDE
difficulty: hard
missing: 8