???????
      +--------
VURLV | LGPPMVM
       -VURLV
        =====
        YVXTUV
       -YPYNXU
        ======
         ZVWRMM
        -ZWWJRH
         ======
         ??????

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
hints: P << J, W << Q
missing: Q