????????
      +---------
UUGWW | TMUPWGWT
       -PTWFF
        =====
        HWYJJG
       -HUTTMG
        ======
         HFTHNW
        -HPGNLY
         ======
          HJNNTT
         -HMNPFP
          ======
          ??????

base: 13
letters: EFGHJLMNPTUWY
difficulty: hard
missing: E