????????
      +---------
LNMTF | LFPYEPFF
       -LNMTF
        =====
         PYPHP
        -HFUTE
         =====
         LLMUTF
        -LLHELP
         ======
           NYPHF
          -NTNGH
           =====
           ?????

base: 11
letters: EFGHLMNPTUY
difficulty: medium