[error] DEADLOCK/NODUP: no remaining values
            4D8
      +--------
40D89 | 4C8F21E
       -40D89
        =====
         BF981
        -6251A
         =====
         4A731E
        -4A1C62
         ======
           38B6

base: 16
letters: 0123456789ABCDEF
difficulty: hard
hints: B << E, 1 << 6