WRLE
      +---------
RPUFY | LXUTEFEY
       -LWMEP
        =====
         YWGLF
        -UTXWE
         =====
         NYRWXE
        -NWGYLW
         ======
          RWTRXY
         -RREWTL
          ======
            TGGE

base: 13
letters: EFGLMNPRTUWXY
difficulty: medium