B43
      +--------
C4238 | 89E3AD9
       -8B219
        =====
         1782D
        -4D291
         =====
         CC5449
        -C0B3A9
         ======
          CC1E0

base: 15
letters: 0123456789ABCDE
difficulty: hard
hints: 1 << D, 2 = E, 4 << 6
missing: 6