WQY
       +---------
QJRXRE | PEXWXYYW
        -RXLWHE
         ======
          YXLRYY
         -XWQLQE
          ======
          JJRPWYW
         -JEHQWEE
          =======
            HYEYW

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