XYM
      +--------
NFRNP | RJRQRMY
       -WHNMG
        =====
        XFWUHM
       -XNHXRF
        ======
         JYXXXY
        -JLRUQL
         ======
          JMQFX

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