????????
      +---------
FELEL | UELMHJHJ
       -HGNGN
        =====
        EYHHFJ
       -EUNLNY
        ======
         EEULXH
        - PLULU
         ======
          EMEYMJ
         -ELHXHH
          ======
          ??????

base: 13
letters: EFGHJLMNPUWXY
difficulty: hard
missing: W