????????
      +---------
LLPUL | NEEXFNPF
       -RNJQR
        =====
        JJRLPN
       -JXXFPF
        ======
         JYLFEP
        -JPYEXU
         ======
           ELEJF
          -RNJQR
           =====
           ?????

base: 11
letters: EFJLNPQRUXY
difficulty: intermediate