XAET
      ----------
 TETT ) XAFYUQAU
       -QTHTA
        =====
         AEYXQ
        -HTQTX
         =====
          EEXTA
         -ATYTQ
          =====
           TQUFU
          -ETUTY
           =====
            QTFT

base: 10
symbols: ACEFHQTUXY
difficulty: intermediate
missing: C