????????
      +---------
GNMEP | MEYNRQNL
       -GNMEP
        =====
        WMHYHQ
       -WNPLRH
        ======
         FHRJHN
        -FLPYMQ
         ======
          WRLURL
         -WNPLRH
          ======
          ??????

base: 14
letters: EFGHJLMNPQRUWY
difficulty: challenging