????????
     +---------
JRXE | RPTWEJXJ
      -TRRRW
       =====
        WREXJ
       - JRXE
        =====
         RRPEX
        -TRRRW
         =====
          JWRWJ
         -RRTPT
          =====
          ?????

base: 7
letters: EJPRTWX
difficulty: intermediate