[error] DEADLOCK/NODUP: no remaining values
        ????????
      +---------
29346 | 35B4A939
       -29346
        =====
        264779
       -26AA85
        ======
          05303
         -3A69B
          =====
           46629
          -84607
           =====
           ?????

base: 12
letters: 0123456789AB
difficulty: medium
missing: 1