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https://www.portatilesbaratos.eu/the-complete-beginners-guide-to-mac-os-x-sierra-version-10-12-for-macbook-macbook-air-macbook-pro-imac-mac-pro-and-mac-mini/
The Complete Beginners Guide to Mac OS X Sierra (Version 10.12): (For MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, and Mac Mini)