????????
      +---------
WTYGU | MFHTLMLG
       -WTYGU
        =====
         YMRGM
        -LTXPW
         =====
         UGPHUL
        -UMEUHF
         ======
           EPGTG
          -PNYNM
           =====
           ?????

base: 14
letters: EFGHLMNPRTUWXY
difficulty: medium