????????
      +---------
NWLNN | LHHTTNFN
       -WFWFF
        =====
        NYEJEN
       -NYTHLL
        ======
          LXNHF
         -WFWFF
          =====
           EWNYN
          -JYTHH
           =====
          ??????

base: 11
letters: EFHJLNRTWXY
missing: R
difficulty: medium