2951
      +---------
48032 | 55D0C821
       -48032
        =====
        A91CE8
       -AD4AA9
        ======
         2D4212
        -251605
         ======
          4EABD1
         -4A3021
          ======
           2848B

base: 15
letters: 0123456789ABCDE
difficulty: hard
missing: 7