HMW
      +--------
WQMTH | QWMWQTQ
       -WQMTH
        =====
        HFTWFT
       -HHFFTM
        ======
         MHQWFQ
        -HQFTTW
         ======
          MHWFM

base: 6
letters: FHMQTW
difficulty: intermediate
restrictions: no multiplication