[error] DEADLOCK/NODUP: no remaining values
[error] DEADLOCK/NODUP: no remaining values
       ???????
     +--------
6643 | 0311464
      -01124
       =====
        42126
       -16625
        =====
         16534
        -16625
         =====
         ?????

base: 7
letters: 0123456
difficulty: intermediate