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Chapter 7a: http://www.youtube.com/watch?v=w27GKcKKF4YChapter 7b: http://www.youtube.com/watch?v=752epd6qdBwChapter 8a: http://www.youtube.com/watch?v=O4XWeMx9mYIChapter 8b: http://www.youtube.com/watch?v=1i_Dvk2zSYUChapter 9a: http://www.youtube.com/watch?v=PUmiXDpyulIChapter 9b: http://www.youtube.com/watch?v=pQOlCdC3GiQ