????????
      +---------
NPPLL | RPXUUMHY
       -MWHUF
        =====
         LRGNM
        -HMJJG
         =====
         NGWLMH
        -NGJLJX
         ======
           MYLEY
          -MWHUF
           =====
           ?????

base: 14
letters: EFGHJLMNPRUWXY
difficulty: medium