???????
      +--------
MXTNX | QQNXXXX
       -MXTNX
        =====
        WEJMGX
       -WQFNGJ
        ======
          LEGEX
         -FNLPN
          =====
          ?????

base: 13
letters: EFGHJLMNPQTWX
difficulty: hard
hints: Q << P
missing: H