????????
      +---------
JGEFP | HQGMRJJF
       -EFHFW
        =====
         WFEHJ
        -PPLXL
         =====
          YGEYJ
         -YJQFY
          =====
           LWLLF
          -LFXEH
           =====
           ?????

base: 13
letters: EFGHJLMPQRWXY
difficulty: hard