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Apple MacBook Pro with Retina Display (13-inch, 2015) review: Apple's 2015 MacBook Pro is still around for those who want fewer dongles - CNET
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Can I upgrade the RAM of the MacBook Pro 13' Retina from 8gb to 16gb after/during purchase? - Quora
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MacBook Pro with Retina display review (13-inch, 2015) | Engadget
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How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld