FRN
       ----------
RMXPXE ) JEPFPNNF
        -XPGFHE
         ======
          NPGXNN
         -PFRGRE
          ======
          MMXJFNF
         -MEHRFEE
          =======
            HNENF

base: 10
symbols: EFGHJMNPRX
difficulty: intermediate
restrictions: no multiplication