????????
      +---------
FNJMQ | EWJUETUQ
       -FNJMQ
        =====
        GMEHRT
       -GHMWHE
        ======
         RPFURU
        -TWNQWM
         ======
          GNWNHQ
         -GHMWHE
          ======
          ??????

base: 13
letters: EFGHJMNPQRTUW
difficulty: challenging
hints: H << F