LJJW
      +---------
YJLTN | HZTLQMUX
       -NTYZL
        =====
        MQRXXM
       -MMWWGM
        ======
         MTWZVU
        -MMWWGM
         ======
          MVLGHX
         -LPUGRW
          ======
           RMVWJ

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard