RNUJ
    +-------
PRH | RHGXUQ
     -RWT
      ===
       WHX
      -NMX
       ===
       PPFU
      -PFWJ
       ====
         MWQ
        -YQU
         ===
          UJ

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