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Believe in your dreams and they may come true. Believe in yourself and they will come true. Believe!!! ii ACKNOWLEDGEMENTS I am thankful for my wife Monick. She has been my greatest supporter over more than 15 years of what I consider to be a very happy marriage. Without her unconditional love and acceptance I would not be here. I am thankful for my parents Irineu and Bete. They provided me the best education they possibly could afford and for that I am very thankful. More than that, through their own experiences and good example, they are responsible for whom I am. I am thankful for my kids João Victor, Zion and Nicole. They provide me with joy and new experiences every day. I am very happy to be their father and to be able to see them growing every day. I am thankful for my brother and sister Hugo and Fabiani, my grandparents Daphnis, Ilze, Silvio and Maria, my cousin Marcelo, my aunt Edna and uncle Silvio and al