????????
      +---------
EJPHR | WYEWJLJL
       -PEJRJ
        =====
        EWYJTL
       -EWUPQY
        ======
          WPTQJ
         -PEJRJ
          =====
          EEYUTL
         -EETGEQ
          ======
          ??????

base: 13
letters: EFGHJLPQRTUWY
difficulty: medium
hints: G << H, F << G
missing: F