????????
      +---------
XQXRX | XRRWHNGH
       -XQXRX
        =====
         GQUEN
        -XQXRX
         =====
          EHLXG
         -XQXRX
          =====
          WPWRQH
         -FGMLMG
          ======
          ??????

base: 13
letters: EFGHLMNPQRUWX
difficulty: medium