CHICAGO (AP) _ Grain futures were mostly lower in early trading Wednesday on the Chicago Board of Trade. Dec. corn rose by 0.5 cent at $4.50 a bushel. Dec. wheat was off 0.25 cent at $5.92 a bushel. Dec. oats was unchanged at $3.45 a bushel. Nov. soybeans fell by 5 cents at $12.20 a...