CHICAGO (AP) — Grain futures were mixed Thursday on the Chicago Board of Trade. Wheat for Dec. lost 4.25 cents at $3.99 a bushel; Dec. corn was unchanged to 3.2925 a bushel; Dec. oats were up 2 cents at $1.76 a bushel; while Nov. soybeans rose 4.75 cents to $9.5025 a bushel. Beef was lower and pork was higher on the Chicago Mercantile Exchange.