????????
      +---------
GLRMR | TPWGXGXM
       -GLRMR
        =====
         RJWRG
        -UHXNX
         =====
         MYPXHX
        -MGUQJQ
         ======
          GFYTYM
         -NLQLTH
          ======
          ??????

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: hard