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Amazon.com: Apple 21.5-inch iMac Intel Core i5 (2.3GHz) 8GB Memory 256GB SSD Silver MHK03LL/A(Renewed) : Electronics
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iMac 21.5-Inch "Core i5" 2.5 (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): EveryMac.com
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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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