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Auto workers staged a walkout last Friday after the United Auto Workers union expanded its strike to a Ford factory in Chicago and a General Motors plant in Michigan. Photo: Charles Rex Arbogast/Associated PressThis copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.