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https://www.youtube.com/watch?v=SVgSLud50ss
http://www.youtube.com/watch?v=7s2fa08TlG4
Part 1: http://www.youtube.com/watch?v=4PSPvHcLnN0
Part 2: http://www.youtube.com/watch?v=CtHlxzOXgYs
(The link by jp191919 is gold though, I'd recommend to watch it at least once if you can find the time)
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