????????
      +---------
TNFJF | FTGRYFMQ
       -TNFJF
        =====
        PLGJLF
       -PWFFEM
        ======
         YGJTGM
        -YPFFRJ
         ======
           JTEXQ
          -TNFJF
           =====
           ?????

base: 14
letters: EFGJLMNPQRTWXY
difficulty: hard