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Testing agencies generally allow newer editions of books as long as they cover the same core content and technical standards relevant to the exam. This is a common practice to ensure candidates have access to up-to-date materials without being restricted to outdated editions. We include newer editions in our bundles because they reflect the latest codes, regulations, and industry standards, which better prepare you for both the exam and your professional work. Old books often go out of print; we only sell NEW books. These editions ensure you’re studying the most current information.