YQNC
      ----------
 CNCC ) YQEFTWQT
       -WCHCQ
        =====
         QNFYW
        -HCWCY
         =====
          NNYCQ
         -QCFCW
          =====
           CWTET
          -NCTCF
           =====
            WCEC

base: 10
symbols: CEFHNQTWXY
difficulty: intermediate
missing: X