CHICAGO (AP) _ Grain futures were mostly higher in early trading Thursday on the Chicago Board of Trade. Dec. corn was unchanged at $4.48 a bushel. Dec. wheat rose by 0.5 cent at $6.00 a bushel. Dec. oats fell by 3.25 cents at $3.48 a bushel. Nov. soybeans was up 1.5 cents at $12.30 a...