?????????
      -----------
URNPZ ) HMQQUGTVP
       -URNPZ
        =====
        QPMZLG
       -QMRLHP
        ======
         QPHGRT
        -QMRLHP
         ======
          QTMTVV
         -QTXWGW
          ======
            GLYUP
           -TMRWW
            =====
            ?????

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