[error] DEADLOCK/NODUP: no remaining values
            8450
      +---------
C3A04 | 563B07A0
       -C3A04
        =====
        349687
       -391C43
        ======
         3756BA
        -382247
         ======
          C89360
         -30CB4B
          ======
           BB8C5

base: 13
letters: 0123456789ABC
difficulty: intermediate