The CBOT was mostly higher in quiet, pre-holiday trade and the theme of the day was position liquidation and risk-off heading into what is practically a four-day weekend. Corn and soybeans found fundamental strength from higher ethanol output and export sales to China, respectively. That helped create firmness in the wheat markets, with commercial demand for HRS wheat (traded on the Minneapolis exchange) supporting wheat’s rally. Soyoil was the upside leader again as traders remain bullish the commodity’s long-term demand. Few contracts made meaningful technical developments and Wednesday’s trade was benign, as it typically is heading into major U.S. holidays.  On the political front, Mexico is clarifying its policy...