NNWW
      +---------
RYLYP | YRWFRTNN
       -RYLYP
        =====
         JWTJT
        -RYLYP
         =====
         EYWNRN
        -EWJJPL
         ======
          EQEPEN
         -EWJJPL
          ======
            TJWE

base: 11
letters: EFJLNPQRTWY
difficulty: medium
restrictions: no multiplication