MLQ
      +---------
MHLGY | MYLRWQPR
       -QGWQGL
        ======
         LHYHWP
        -GLTYPW
         ======
          QYWLYR
         -LGGWTP
          ======
           GHGRQ

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