????????
      +---------
GGMQH | PFFPYNXY
       -XLPPQ
        =====
        JJTUWN
       -JWXFWQ
        ======
          YJUTX
         -GGMQH
          =====
          WMTHMY
         -WXRUNU
          ======
          ??????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: challenging
hints: H << P