RPW
       -----------
EXNMNL ) PXRXMRWWL
        -LWPNRXX
         =======
          LXMLPEW
         -XENNPMP
          =======
           EMLNPLL
          -PPRNWXE
           =======
            PPWENR

base: 8
symbols: ELMNPRWX
difficulty: intermediate