????????
      +---------
JFYEW | TLNWWYPU
       -JFYEW
        =====
        EUMQRY
       -EQJYLU
        ======
         LLRNNP
        -LRUENL
         ======
           MURNU
          -JFYEW
           =====
           ?????

base: 13
letters: EFJLMNPQRTUWY
difficulty: hard