UFUHY
     +---------
UWUT | UWRWULJR
      -UWUT
       ====
         JLUL
        -UWUT
         ====
         UJHHJ
        -UUYEW
         =====
          UUWHR
         -UFEWL
          =====
            YEY

base: 10
letters: EFHJLRTUWY
difficulty: medium
restrictions: no multiplication