????????
      +---------
JPGPH | UTEJNEEU
       -UFGFW
        =====
         WEHPE
        -JPGPH
         =====
         FHHGPE
        -PRHGEQ
         ======
          EUUNFU
         -ELUPFN
          ======
          ??????

base: 13
letters: EFGHJLNPQRTUW
difficulty: hard