Acknowledgments

Writing a book is a difficult task, and at least one of us has experienced this process four times before. This difficulty comes at different levels from different aspects, and not only affects authors’ lives and careers but also the people around them. So a book is not only an indicator of the authors’ efforts but also of the people around them. Here we want to take a moment to mention some people who helped us finish this book.

First, we want to thank families and friends who supported us during the long writing process and put up with our absences and excuses. Thanks to Keyvan’s parents and sister, who have been supporting him from a very long distance and always encouraged him to move forward with his professional life. Also, ...

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