XLMP
    +-------
WPJ | GUGGRU
     -GFH
      ===
       PMG
      -LHX
       ===
        NWR
       -HRY
        ===
         YXU
        -YWQ
         ===
          YX

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
hints: G << N, Y << Q << U
missing: T