9B36
      +---------
EEDB3 | 1A91E1CB
       -EEDB3
        =====
        A36311
       -A43680
        ======
         042BEC
        -02713B
         ======
          9D916B
         -9244E5
          ======
           01C9B

base: 15
letters: 0123456789ABCDE
difficulty: medium