????????
      +---------
XTMEX | JLXXGGTE
       -THJHT
        =====
        XFWJJG
       - EPGTH
        ======
         XFHFHT
        - EPGTH
         ======
          XXQQQE
         -XFEFNL
          ======
          ??????

base: 13
letters: EFGHJLMNPQTWX
difficulty: medium