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Five years ago, Amazon closed its $13.7 billion purchase of Whole Foods, by far the biggest acquisition ever for the e-commerce and cloud computing giant. Since then, Amazon has made a lot of changes to the specialty grocer, from lowering prices to embedding checkout technology in its 500-plus U.S. stores.

Amazon has opened 60 new locations, including one "dark store" entirely devoted to filling online orders. Yet Whole Foods still controls just over 1% of the grocery market, according to research firm Numerator, compared with Walmart's 19% and Kroger's 9%.

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