CEHU
      ----------
 UHUU ) CEWQFTEF
       -TUNUE
        =====
         EHQCT
        -NUTUC
         =====
          HHCUE
         -EUQUT
          =====
           UTFWF
          -HUFUQ
           =====
            TUWU

base: 10
symbols: CEFHNQTUWY
difficulty: intermediate
missing: Y