Motley Fool co-founder David Gardner regularly recommends sets of stocks on the Rule Breaker Investing podcast -- essentially giving us all a free taste of the choices he and his team make in Motley Fool Supernova's portfolio universe. And this week, he gives us his 14th batch of five.Now, Gardner has thus far managed something pretty remarkable: For every five-stock set, at every annual review, he has beaten the S&P 500's performance over the same period -- often by a wide margin.