????????
      +---------
EJHQW | QRQYQYXP
       -GTJXY
        =====
        EXQPEY
       -EMPQYR
        ======
         ETERMX
        -EXHTRT
         ======
           PXTJP
          -QTHWH
           =====
           ?????

base: 13
letters: EFGHJMPQRTWXY
difficulty: medium
missing: F