MFL
      +---------
RGYJW | YXXRLELH
       -EFWEHP
        ======
         HHYHXL
        -YJFUPR
         ======
          MWYGEH
         -MXMWGG
          ======
           RJPEM

base: 13
letters: EFGHJLMPRUWXY
difficulty: intermediate
restrictions: one multiplication