????????
      +---------
MQQRY | RYHWXYUG
       -MQQRY
        =====
        UHWHGY
       -UXWJNR
        ======
         NJHMUU
        - EYLXM
         ======
          NGREYG
         -NQUUEU
          ======
          ??????

base: 14
letters: EGHJLMNPQRUWXY
difficulty: medium
missing: P