????????
      +---------
FNNEF | TQFFNQEM
       -QTTMQ
        =====
        EQNHLQ
       -ENTLUF
        ======
         ENMMFE
        -EENFNH
         ======
          MQLTEM
         -MQNMHF
          ======
          ??????

base: 9
letters: EFHLMNQTU
difficulty: intermediate