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A little way off was a small brook , rushing and sparkling along between green banks , and murmuring in a voice very grateful to a little girl who had lived so long on the dry , gray prairies . CFD has grown from a mathematical exercise to an essential tool for many applications . He contends that he would have determined his test strategy differently had he known that , in addition to the 60 % overall pass mark to proceed to the next stage of the selection process , Questions 1 , 4 and 5 were non-compensatory . Although BIS made some regulatory and operational changes to the dual-use export control system , it has not systematically evaluated the system to determine whether it is meeting its stated goal of protecting U.S. national security and economic interests .