December Corn futures close out the week 8 and a quarter cents lower at 447'6, marking a fifth straight week of declines. Weekly corn export sales hit 1.3 million metric tons, up 32% from the four-week average. January Soybean futures finish the week down 34 and a quarter cents at 1234'2 as the USDA reports two flash sales totaling 297,150 metric tons to unknown destinations. December Wheat futures log a ninth consecutive lower weekly close at 603'4, despite weekly export sales reaching a marketing year high of 850,000 metric tons.