????????
      +---------
TZNMW | VVZMHJLZ
       -TZNMW
        =====
        GPUZNJ
       -GTZJTJ
        ======
         HGYTUL
        -GZZQXU
         ======
          GYQQLZ
         - ZZMPR
          ======
          ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: intermediate
hints: Q << M, T << R