????????
      +---------
ETTWG | TJHWPQQE
       -ETTWG
        =====
        HQMWTQ
       -HHUNGT
        ======
         NMXXYQ
        -NPTYGW
         ======
          JUGGPE
         - XEEWX
          ======
          ??????

base: 13
letters: EGHJMNPQTUWXY
difficulty: intermediate