question: Which US presidents since the Vietnam War have studied at Yale ?
answer: Gerald Ford , George H.W. Bush , Bill Clinton , and George W. Bush
turker_answer: Since the Vietnam War , the US presidents that have studied at Yale are Gerald Ford , George H.W. Bush , Bill Clinton , and George W. Bush .
rule-based: Gerald Ford , George H.W. Bush , Bill Clinton , and George W. Bush have studied at Yale .