????????
      +---------
GMMFH | TTNMTWXU
       -FRXRT
        =====
         XFFLW
        -XUWJF
         =====
          WYMTX
         -UXHWX
          =====
           UJWLU
          -GMMFH
           =====
           ?????

base: 14
letters: FGHJLMNPRTUWXY
difficulty: hard
missing: P