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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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Refurbished: Apple iMac 21.5" Retina 4K Display Desktop (3.1 GHz Intel Core i5 Quad-Core, 8GB RAM, 1TB HDD, Mac OS X) - Newegg.com
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