question: When was the centrality of the `` separation '' concept to the Religion Clauses of the Constitution made explicit ?
answer: 1947
turker_answer: The centrality of the `` separation '' concept to the Religion Clauses of the Constitution was made explicit in 1947 .
rule-based: The centrality of the `` separation '' concept to the Religion Clauses of the Constitution was made explicit in 1947 .