????????
      +---------
HEWWT | RRJRETFW
       -HEWWT
        =====
        WLEHWT
       -WXXJJW
        ======
         MMJLRF
        -WNHYXE
         ======
          HYWFMW
         -GJNRFJ
          ======
          ??????

base: 14
letters: EFGHJLMNRTUWXY
difficulty: hard
missing: U