????????
      +---------
LPFGT | MYFXGFLW
       -LPFGT
        =====
        GWRGJF
       -NMUYWP
        ======
         TWHUPL
        -GUQMXU
         ======
          GGWHFW
         -NMUYWP
          ======
          ??????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: medium