????????
      +---------
LJHYN | FXENLFEU
       -LJHYN
        =====
        HHRLNF
       -HXNHWU
        ======
         NHQHRE
        -NEURJH
         ======
          NRJWJU
         -NREELR
          ======
          ??????

base: 13
letters: EFGHJLNQRUWXY
difficulty: hard
missing: G