YUG
      +--------
WJLXH | ZYLMHXQ
       -WJLXH
        =====
        YHXPRX
       -YYVHQM
        ======
         UGHULQ
        -UHMPTT
         ======
           TZJU

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