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Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
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Apple unveils new 21.5-inch Retina iMac, Magic Mouse 2, Magic Trackpad 2, and Magic Keyboard | Macworld
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Apple launches new Retina 4K 21.5-inch iMac, all 27-inch iMacs now feature Retina 5K displays - 9to5Mac
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Apple iMac with 21.5in Retina 4K display (1TB HDD, Intel Core i3 8th Gen. 3.60 GHz, 8GB) Gray - MRT32LL/A (March, 2019) for sale online | eBay
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