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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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Amazon.com: Late-2015 Apple iMac 21.5 with 4K Retina Display/3.1GHz Intel Core i5-5675R Quad-Core (21.5-inch, 8GB RAM, 1TB) (Renewed) : Electronics
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Apple iMac 21.5" Retina 4K Core i5, 3.0GHz 8GB RAM 1TB Fusion Drive - Silver (Renewed) | Entrepreneur
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Apple iMac 21.5" 4K (2017): Unboxing & Review - YouTube
Review: The 2019 21.5-inch iMac 4K is iterative, not transformative | AppleInsider
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iMac (Retina 4K, 21.5-inch, 2017) - Technical Specifications
