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First and foremost, I praise Jesus Christ, as the Beautiful Saviour, and dedicate this dissertation to Him. 

Secondly, I am profoundly indebted to Tom Brown as a supervisor. 

Next, I am deeply grateful for (1) the full funding from the Indonesia Endowment Fund for Education (Lembaga Pengelola Dana Pendidikan) and (2) the study permit from the Audit Board of the Republic of Indonesia.  

Furthermore, I also sincerely devote this project to Wilmart Gultom, Jonathan Gultom, Tutur Pasaribu, Esmerita Aritonang, Williater Gultom, Marthalena Tampubolon, Eko Pasaribu, and Joshua Pasaribu.  

Moreover, I genuinely appreciate my families, personal tutor, lecturers, and colleagues for their immense support and assistance. 

Jesus blesses you.