[error] DEADLOCK/NODUP: no remaining values
            CE1
      +--------
9CADA | A2077BA
       -9CADA
        =====
        01091B
       -059A61
        ======
         382E9A
        -EA6F9E
         ======
          78847

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: 4