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2019 Apple iMac with Retina 4K/3.6 GHz Intel Core i3 Quad-Core (21.5-Inch, 8GB RAM, 1TB) - Silver (Renewed) : Electronics
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Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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