C955
      +---------
25FF7 | D9EBC095
       -0E645
        =====
        63DAD0
       -620C4D
        ======
         CCD8A9
        -C4376C
         ======
          C2FEC5
         -C4376C
          ======
           26069

base: 16
letters: 0123456789ABCDEF
difficulty: medium
missing: 1