04BC
      +---------
B795E | 8A20D798
       -8B444
        =====
         59A17
        -542D0
         =====
          B87E9
         -B795E
          =====
           21C88
          -CA64A
           =====
            AAB1

base: 15
letters: 0123456789ABCDE
difficulty: hard
missing: 3