GTEM
      +---------
PNMHT | YPHMMUGG
       -PNMHT
        =====
        GHEPGU
       -GXHHTF
        ======
         PHNMEG
        -PYGXUG
         ======
          GUYXRG
         -GTGLLX
          ======
           PPXRE

base: 13
letters: EFGHLMNPRTUXY
difficulty: medium