????????
      +---------
GUHRL | PWJPYNXZ
       -GUHRL
        =====
        THHLJN
       -TWGRUQ
        ======
         JGLPNX
        -TRNJYQ
         ======
          GZGJXZ
         -GPXMLL
          ======
          ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: V << G, M << U
missing: V