ATHC
      ----------
 CHCC ) ATQWXNTX
       -NCFCT
        =====
         THWAN
        -FCNCA
         =====
          HHACT
         -TCWCN
          =====
           CNXQX
          -HCXCW
           =====
            NCQC

base: 10
symbols: ACEFHNQTWX
difficulty: intermediate
missing: E