MWJZ
      +---------
HWPNZ | GXUHZPTQ
       -HWPNZ
        =====
        QULGLP
       -TGPHNR
        ======
         QYTTNT
        -QQNNRV
         ======
          HHWUYQ
         -HLWWUM
          ======
           RZJNT

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