FENY
      ----------
 YNYY ) FEQAHCEH
       -CYXYE
        =====
         ENAFC
        -XYCYF
         =====
          NNFYE
         -EYAYC
          =====
           YCHQH
          -NYHYA
           =====
            CYQY

base: 10
symbols: ACEFHNQTXY
difficulty: intermediate
missing: T