????????
      +---------
EWHQG | WGQQQNEG
       -EWHQG
        =====
        PFQHRN
       -LRTTPP
        ======
         ENLMQE
        -EPLEQL
         ======
          MHGJMG
         -MNGNJN
          ======
          ??????

base: 13
letters: EFGHJLMNPQRTW
difficulty: hard