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Someday, I had to show for second time, now to Brawijaya Physics's students what I was knowed about Pendulum simulation. Startly that goes be well and I not have problem anything about coding. Then, when we want to enter the theoretically physics concept to Pendulum....ha.. ha :D, I was forgeted about that method and our work can't be completed. After that, I looking to the reference that explained this method for second time and finally this is our simulation. How Great God that created human to need each other not only once?