????????
      +---------
JGFGL | PPHXMMUG
       -JGFGL
        =====
         HXRHM
        -JGFGL
         =====
         JRTFHU
        -MLXLPM
         ======
          JTTMNG
         -JNYRXN
          ======
          ??????

base: 14
letters: FGHJLMNPQRTUXY
difficulty: medium
missing: Q