???????
     +--------
RUWU | NNUWNRU
      -RUWU
       ====
        HRRN
       -RUWU
        ====
        LUWHR
       -LFWUE
        =====
         EYEXU
        - RUWU
         =====
         ?????

base: 11
letters: EFHLNRTUWXY
missing: T
difficulty: medium