GMHQ
    +-------
JNL | YXFLTY
     -PTY
      ===
      FGJL
     -NQWG
      ====
       FQJT
      -FWUR
       ====
        FJJY
       -FGMX
        ====
         GXJ

base: 15
letters: FGHJLMNPQRTUWXY
difficulty: medium
hints: R << T << X
missing: H