????????
      +---------
HWJUT | YYRWUTFL
       -GJGFM
        =====
        LWUHGT
       - MYTJH
        ======
         WYMWLF
        -WGWENR
         ======
          LGGLEL
         -LGRLEW
          ======
          ??????

base: 13
letters: EFGHJLMNRTUWY
difficulty: hard