????????
      +---------
XHUQW | HJRWRPQF
       -HHGLN
        =====
         GUGNP
        -XHUQW
         =====
          RHWXQ
         -LLXGP
          =====
          XLLJXF
         -XUJPUL
          ======
          ??????

base: 13
letters: FGHJLNPQRUWXY
difficulty: medium
hints: Y << P
missing: Y