[error] DEADLOCK/NODUP: no remaining values
          05618
     +---------
9291 | 63374409
      -1217
       ====
       91634
      -90676
       =====
         5894
        -5381
         ====
          4000
         -6326
          ====
          97449
         -97997
          =====
            625

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