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Amazon.com: Apple 21.5" iMac with Retina 4K Display Desktop, Intel Core i5, 8GB RAM, 1TB HDD - MRT42LL/A (Renewed) : Electronics
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Apple 21.5-inch iMac with Retina 4K Display (2015) review: Display dazzles, but options are fewer | ZDNET
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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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