????????
      +---------
XYTXG | WULUUFYT
       -YTFFT
        =====
        XFWTFF
       -XFGNPU
        ======
          FXJWY
         -GEGGF
          =====
          XFXFXT
         -XGLUQL
          ======
          ??????

base: 14
letters: EFGJLMNPQTUWXY
difficulty: hard
missing: M