????????
      +---------
FJQJG | YUUWUEJH
       -GQYHU
        =====
        FRTHPE
       -FFYGPQ
        ======
         FFWUUJ
        - UQTTT
         ======
          FTTTFH
         -FTREEE
          ======
          ??????

base: 13
letters: EFGHJPQRTUWXY
difficulty: medium
missing: X