JRPC
      +---------
MXXRM | GEXJCCMA
       -JEAJJ
        =====
         APWPC
        -ERCRR
         =====
          EJAMM
         -CJGWP
          =====
          MWRWRA
         -MWMJJC
          ======
            XEXJ

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