????????
      +---------
XJFLU | GNXLNFLW
       -JRLTF
        =====
         RHQWF
        -RTRNE
         =====
          RNJEL
         -RTRNE
          =====
           THUJW
          -XJFLU
           =====
           ?????

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