| The following conventions are used in this book: - Constant width
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Used for arrays, classes, code examples, loops , modules, namespaces, objects, packages, statements, and to show the output of commands. - Italics
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Used for commands, directory names , filenames, example URLs, variables , and for new terms where they are defined. | | This icon designates a note, which is an important aside to the nearby text. | | | | This icon designates a warning relating to the nearby text. | | |