????????
      ----------
LGWUQ ) GVLHRHNP
       -ULMPR
        =====
         YGLXH
        -PHXJW
         =====
          PVJMN
         -ULMPR
          =====
          VHVJHP
         -VYZZGT
          ======
          ??????

base: 16
symbols: GHJLMNPQRTUVWXYZ
difficulty: hard