[error] DEADLOCK/NODUP: no remaining values
       ????????
     +---------
6135 | 40624532
      -54013
       =====
        11415
       -10444
        =====
         10033
        -42612
         =====
          65562
         -13256
          =====
          ?????

base: 7
letters: 0123456
difficulty: medium