WGYM
      +---------
TPFLL | QTQPWMGL
       -MQHLY
        =====
         PGYGM
        -GWTLQ
         =====
          WGGLG
         -HGPLW
          =====
           LQLWL
          -LTWLP
           =====
            MGMW

base: 10
letters: FGHLMPQTWY
difficulty: intermediate
restrictions: no multiplication