????????
      +---------
XJXQR | LUNJWMRU
       -FWPFJ
        =====
         LLUUM
        -LMJEL
         =====
          EEXFR
         -JGJNQ
          =====
           LLLGU
          -LMJEL
           =====
           ?????

base: 14
letters: EFGJLMNPQRUWXY
difficulty: medium
missing: Y