3C4
      +--------
4DF07 | BD10106
       -AC822
        =====
        942780
       -9CAC70
        ======
         3F9CE6
        -3864D2
         ======
          C4083

base: 16
letters: 0123456789ABCDEF
difficulty: hard
hints: 4 << 6, 2 << F, 9 = 1
missing: 5