Now, I am exercising to learn Swift Programming language in Swift Playground on iPad. Attached link: A Swift Tour Explore the features and syntax of Swift https://docs.swift.org/swift-book/documentation/the-swift-programming-language/guidedtour/ I observe or I see: Experiment Create a constant with an explicit type of Float and a value of 4. before that link. Long time ago I was practicing inside the Swift Playground App the next PDF book link, https://books.apple.com/ve/book/the-swift-programming-language-swift-5-7-beta/id1002622538?l=en-GB I lost the knowledge, how to open the pdf book on Swift Playground to experiment inside Swift Playground. also I received information about PDF Book is old, is version 5.7 that is why I am with the link on site of the documentation. Is version 6.3 I would like to know if it is possible to open the link: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/guidedtour/ in Swift Playground App to work with: Experiment Create a constant with an explicit type of Float and a value of 4. Thank you