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| https://cdn.pixabay.com/photo/2017/01/21/09/47/learn-1996845__340.jpg |
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| https://cdn.pixabay.com/photo/2017/06/15/11/51/learn-2405206__340.jpg |
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| diambil dari drive local (komputer) |
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| https://cdn.pixabay.com/photo/2017/02/13/08/54/brain-2062057__340.jpg |
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| https://cdn.pixabay.com/photo/2016/06/13/07/59/pi-1453836__340.jpg |
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