Corn had been trading unchanged to lower overnight, but the export sales numbers did bring some buying to this morning's opening.The collapse in the euro, Canadian dollar and Aussie dollar continues to make U.S. wheat struggle in world markets. General Comments Markets were relatively quiet overnight without much news around to finish the week. USDA's weekly export sales report, which was delayed one day because of last Monday's holiday, did change the tenor of trade. Corn export sales were a marketing year high and net soybean export sales were a marketing year low. That pushed corn higher and soybeans lower early in today's session.The crude oil market was basically stable today and is still hovering in the $45-47 range. The U.S. dollar...