GXFA
      +---------
LEGRY | LFEPYTTG
       -LEGRY
        =====
         PPLXTT
        -PXAGTP
         ======
          GYRXFG
         -GYXRTA
          ======
            TXYF

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