E9E
      +--------
4D951 | 20AC410
       -4D951
        =====
        EF8DB1
       -EF6A7B
        ======
          482A0
         -4D951
          =====
           7DE1

base: 16
letters: 0123456789ABCDEF
difficulty: challenging
hints: 6 << E, 4 << 1
missing: 3