HJX
      +--------
HTLXJ | RWYHYXZ
       -HTLXJ
        =====
         MMZUX
        -WYWGQ
         =====
          PLYUZ
         -LZZNG
          =====
           VHUH

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: hard
missing: V