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Put something in here about this section being premium content with articles 500+ words related to Swift development, algorithms and data structures. This may include in-depth analysis of topics already presented in the Swift Algorithms Book, a review of specific code challenges in Swift, or advice or techniques in iOS technical interview preparation. Beyond the website, each article comes in downloadable PDF format and also includes source code in Xcode Playground format. The price is $9.95 per month and users can cancel anytime.