RNGG
    +-------
RJJ | MQXYLW
     -TYM
      ===
      XFNY
     -XFUN
      ====
        YHL
       -YTG
        ===
         NNW
        -YTG
         ===
         XQF

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
hints: N << F
missing: P