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It's Google's biggest retail partnership -- and the most personalized shopping experience it offers -- as it tries to broaden the reach of its voice-powered assistant Home speaker. Wal-Mart announced Monday that it's expanding its grocery delivery service with ride-hailing service Uber, and it's been testing same-day delivery service with Deliv at Sam's Club in Miami. With other Google Express retailers, personalization takes time as the assistant learns shoppers' preferences, says Brian Elliott, general manager of Google Express. Wal-Mart says it will be tapping its 4,700 U.S. stores and its fulfillment network next year to offer more kinds of customer experiences using voice shopping.