????????
      +---------
UGUTQ | GRNHPYTP
       -MXRLW
        =====
         TFUPY
        -NNJMH
         =====
          YNNGT
         -FRYHR
          =====
          UFMLYP
         -UQMGYP
          ======
          ??????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard