Part 1-Light

more videos at https://www.youtube.com/playlist?list=PLrZlitTZJojWkgIgP-aDAOUJHPayZ9I8u ......

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Part 2-Light

more videos at https://www.youtube.com/playlist?list=PLrZlitTZJojWkgIgP-aDAOUJHPayZ9I8u ......

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