CHICAGO (AP) _ Grain futures were lower Wednesday on the Chicago Board of Trade. Sept. corn was off 3.25 cents at $5.18 a bushel. Sept. wheat was off 19.5 cents at $7.56 a bushel. Sept. oats lost 1.25 cents at $3.55 a bushel. Sept. soybeans fell by 5.25 cents at $12.96 a bushel. Beef was...