YXAL
     +--------
LAQF | TXLARAY
      -FTAF
       ====
        FYYR
       -YCQR
        ====
        LFURA
       -LFLTR
        =====
          XUAY
         -LAQF
          ====
           FAA

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