RLU
      +---------
LLNFR | PNFUFHNE
       -PEJUFE
        ======
         JRTTXN
        -JEJEEN
         ======
          HPLRTE
         -HTQQLL
          ======
           PPUEU

base: 13
letters: EFHJLNPQRTUXY
difficulty: hard
missing: Y