???????
     +--------
UGUH | GQLMQUH
      -UGUH
       ====
       HWWGQ
      -HGGUQ
       =====
        UUUTU
       -UHFWW
        =====
          GLQH
         -UGUH
          ====
          ????

base: 11
letters: FGHLMQRTUWX
missing: X R
difficulty: medium
hints: X << R