???????
     +--------
XFNT | QFTXUFN
      -FTLW
       ====
        QAFU
       -FTLW
        ====
         WXQF
        -FTLW
         ====
         XUUAN
        -XLQWL
         =====
         ?????

base: 9
letters: AFLNQTUWX
difficulty: medium