????????
      +---------
LFFWW | PMRTMWUT
       -LFFWW
        =====
         FWLWW
        -YGWJU
         =====
         LMYQTU
        -LYUTUE
         ======
           YMGQT
          -YGWJU
           =====
           ?????

base: 13
letters: EFGJLMPQRTUWY
difficulty: medium