????????
      +---------
QTRYE | RTGPWWNH
       -QTRYE
        =====
        HWWHPW
       -HWNQPE
        ======
          QMFPN
         -QTRYE
          =====
           RNHLH
          -QTRYE
           =====
           ?????

base: 14
letters: EFGHLMNPQRTWXY
difficulty: medium
missing: X