NTPH
      +---------
TTRNP | TWJHWNNH
       -TTRNP
        =====
         MYFHN
        -RRULL
         =====
         NXLPHN
        -NRMXJX
         ======
          NHTHYH
         -NGJUMG
          ======
            LMMN

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