TMU
      +--------
QTZYZ | ZXGNNLZ
       -QTZYZ
        =====
        GUGQUL
       -GRQZWU
        ======
         PJXMQZ
        -MZWHQM
         ======
          NJJVN

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