B8FF
      +---------
1DA17 | DE3ED2C3
       -1DA17
        =====
        968272
       -9F5AF1
        ======
         59335C
        -5BECB0
         ======
          55CAA3
         -5BECB0
          ======
           AEF47

base: 16
letters: 0123456789ABCDEF
difficulty: challenging
hints: E << C, A << 3, 3 << 0
missing: 4