Wheat:  Net sales of 48,400 metric tons for delivery in the 2018/2019--a marketing-year low--were down 58 percent from the previous week and 74 percent from the prior 4-week average.  Corn:  Net sales of 442,100 MT for 2018/2019 were down 20 percent from the previous week and from the prior 4-week average.   Soybeans:  Net sales of 535,800 MT for 2018/2019 were up 45 percent from the previous week and up noticeably from the prior 4-week average.    Soybean Cake and Meal:    Net sales of 188,000 MT for 2018/2019 were down 4 percent from the previous week, but unchanged from the prior 4-week average  Soybean Oil:    Net sales of 9,100 MT for 2018/2019 were down 16 perce...