Lina smiled. Then she reached Chapter 4: Volume Bangun Ruang (Volume of 3D Shapes). At the top of the page, in large, careful letters:
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For the next two hours, the rain faded to a drizzle. They didn’t download a single perfect PDF. Instead, they traced Pak Nurhadi’s blue ink with their eyes, debated who was greedier (it was Dimas, of course), and folded paper into cubes to understand volume. Lina smiled