SPREADS Sep crush firms back to 98c/bu while oilshare eases off its monthly highs to trade to 31.78 percent.   September contract liquidation continues, with deferred spreads widening out for corn.  Dec/March trades out to 10c from 9 1/2c.  The Dec/Dec inverse weakens below 10c to trade back to 9 1/2c.   Sep/Dec corn firms into 8 1/2c from 9c while Sep/Dec wheat trades from 7 1/4c to 7 3/4c.  September wheat still holds the largest amount of open interest for now, at 172,710 contracts vs. Dec at 114,342 contracts.  September open interest was down 4,931 contracts suggesting long liquidation.  December corn open interest stands at 528,334 vs. Dec at 747,697 contracts.  Most of the spread tr...