????????
      +---------
QFYLH | EFEGTLEP
       -QFYLH
        =====
        RYELNL
       -RPTYRH
        ======
         MHTQQE
        -MNLTMW
         ======
          XWEREP
         -RPTYRH
          ======
          ??????

base: 14
letters: EFGHLMNPQRTWXY
difficulty: hard