| The following typographical conventions are used in the text of this book: Italic Indicates emphasis, new terms, URLs, email addresses, filenames, paths, and Unix utilities. Constant-width regular Indicates commands, variables, attributes, functions, classes, namespaces, methods, modules, values, the contents of files, the output from commands, and code examples that break recommended practices. Constant-width bold Indicates commands and other text that should be typed literally by the user, and code examples that demonstrate recommended practices. Constant-width italic Indicates text that should be replaced with user-supplied values and comments within code examples.
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