[error] DEADLOCK/NODUP: no remaining values
            328A
      +---------
A7406 | 686A3740
       -A7406
        =====
        391707
       -333479
        ======
         2A3814
        -22957A
         ======
          91A180
         -990175
          ======
           03796

base: 11
letters: 0123456789A
difficulty: medium
restrictions: no multiplication