????????
      +---------
JWNQN | EEQTNTWG
       -JWNQN
        =====
        QWGWYT
       -QHUJFJ
        ======
         FEFWMW
        -FQEGJG
         ======
          JHWTTG
         -JFUGYT
          ======
          ??????

base: 13
letters: EFGHJLMNQTUWY
difficulty: hard
missing: L