std::vector<iterator> findMoviesWithRoles(std::string);
	std::vector<iterator> findMoviesWithGenre(std::string);
	std::vector<iterator> findTitles(std::string);
	std::vector<std::string> findTitles_andEpisodes(std::string);
	std::vector<std::string> findTitles(int);
	iterator findItem(std::string);
	iterator findItem(std::string, std::string);