https://docs.google.com/presentation/d/1DYBewMJ0bVZMMEBk4X4zV6WvtZMaKHrjeJZg5CPo_FA/edit?userstoinvite=t128@carmelss.edu.hk&ts=590bf765&actionButton=1#slide=id.gc6f75fceb_0_0

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