WTM
      +--------
XLTNX | LFWXEWL
       -XLTNX
        =====
        XNWMTW
       -XQYNMF
        ======
         EYLEQL
        -JFXLMJ
         ======
          XXXTF

base: 11
letters: EFJLMNQTWXY
difficulty: medium