This June 1, 2017, file photo, shows a Walmart sign at a store in Hialeah Gardens, Fla. Walmart is rolling out next-day delivery on its most popular items, raising the stakes in the retail shipping wars. The nation’s largest retailer says Tuesday, May 13, 2019, it's been building its own network of more efficient e-commerce distribution centers to enable the faster delivery. (AP Photo/Alan Diaz, File)
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