CHICAGO (AP) _ Grain futures were mixed in early trading Tuesday on the Chicago Board of Trade. Dec. corn lost 0.25 cent at $4.48 a bushel. Dec. wheat was down 0.5 cent at $6.06 a bushel. Dec. oats was up 0.75 cent at $3.42 a bushel. Nov. soybeans was up 0.75 cent at $12.05 a...