YNXW
      ----------
 WXWW ) YNCQATNA
       -TWFWN
        =====
         NXQYT
        -FWTWY
         =====
          XXYWN
         -NWQWT
          =====
           WTACA
          -XWAWQ
           =====
            TWCW

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