National Edition News cover for November 22, 2015 - Largest U.S. insurer may leave Obamacare program: FILE - In an Oct. 16, 2012, file photo, a sign stands outside UnitedHealth Group Inc.'s campus in Minnetonka, Minn. UnitedHealth Group Inc. reports quarterly financial results Thursday, Oct. 15, 2015. (AP Photo/Jim Mone, File)
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