????????
      ----------
YYYLZ ) LGVLMRXW
       -YYYLZ
        =====
        HVLZVR
       -HMMVRV
        ======
          PGZHX
         -JJURX
          =====
          HJHXNW
         -HTTULL
          ======
          ??????

base: 16
symbols: GHJLMNPQRTUVWXYZ
difficulty: medium
hints: G << W, X < T
missing: Q