YXJ
      +--------
MRQFG | PTNTHLW
       -YGQYP
        =====
        MYHNFL
       -MYRGLT
        ======
          WMMGW
         -LGTXU
          =====
           LPHW

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