YHQL
      +---------
QRXPJ | NWPLWPPZ
       -QRXPJ
        =====
        MXLRJP
       -MLNRGM
        ======
         ZXULVP
        -ZVTWMP
         ======
          YMZJUZ
         - JUGZW
          ======
           XZYNM

base: 16
letters: GHJLMNPQRTUVWXYZ
difficulty: medium
missing: H