????????
      +---------
XTWRL | JXMFMNNY
       -ERPYW
        =====
         JPFYN
        -ERPYW
         =====
         FFNHMN
        - ERPYW
         ======
          WHXWMY
         -MLPJME
          ======
          ??????

base: 14
letters: EFHJLMNPQRTWXY
difficulty: medium
hints: Q << W, L << T
missing: Q