????????
      +---------
WJEWH | HLJHQRYG
       -MMJHW
        =====
        WYFFPR
       -WGGFYG
        ======
          TFWLY
         -LMTTP
          =====
           QGTRG
          -PMWPT
           =====
           ?????

base: 13
letters: EFGHJLMPQRTWY
difficulty: hard