LNTP
    +-------
QUQ | TYFTWG
     -PWP
      ===
      RUHT
     -RJYJ
      ====
       URTW
      -NYLP
       ====
        NWYG
       -NXYQ
        ====
         RJX

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard
missing: M