CHICAGO (AP) _ Grain futures were mostly higher Thursday on the Chicago Board of Trade. Dec. corn was unchanged at $5.26 a bushel. Dec. wheat fell by 2 cents at $7.06 a bushel. Dec. oats was up 8.25 cents at $4.24 a bushel. Nov. soybeans gained 6.5 cents at $13.16 a bushel. Beef was lower...