[error] DEADLOCK/NODUP: no remaining values
              666
       +---------
436369 | 48611743
        -436369
         ======
          831604
         -436369
          ======
          6376563
         - 436369
          =======
           773181

base: 10
letters: 0123456789
difficulty: intermediate
restrictions: no multiplication
missing: 2