????????
      +---------
PHUXG | FFGXEYWW
       -PHUXG
        =====
        TMPWGY
       -TEQMJJ
        ======
         HGJEUW
        -HJPEHQ
         ======
          YMWWUW
         -YTJWWE
          ======
          ??????

base: 14
letters: EFGHJMNPQTUWXY
difficulty: hard
missing: N