????????
      +---------
MREWM | PGMJRRPT
       -MREWM
        =====
        EMFFWR
       -EHQXPU
        ======
         FTXPTP
        -FJQERE
         ======
          EPQEQT
         -EQWWHF
          ======
          ??????

base: 13
letters: EFGHJMPQRTUWX
difficulty: medium