FJX
       ----------
JMHPHG ) RGPFPXXF
        -HPLFQG
         ======
          XPLHXX
         -PFJLJG
          ======
          MMHRFXF
         -MGQJFGG
          =======
            QXGXF

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