code: def intersect(self, other):
          
          self.automaton = fst.intersect(self.automaton, other.automaton)
          return  self
docs: Constructs an unminimized DFA recognizing
          the intersection of the languages of two given DFAs.
          Args:
              other (DFA): The other DFA that will be used
                           for the intersect operation
          Returns:
          Returns:
              DFA: The resulting DFA