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1, http://video.google.com/videoplay?docid=439621594918011792&hl=en 2, http://video.google.com/videoplay?docid=1148956863077954668&hl=en 3, http://video.google.com/videoplay?docid=538373460286402826&hl=en 4 http://video.google.com/videoplay?docid=-8524670288311950798&hl=en 5, http://video.google.com/videoplay?docid=-2293498287403398117&hl=en 6, http://video.google.com/videoplay?docid=-7378608028295384045&hl=en 7, http://video.google.com/videoplay?docid=-4600177313313321140&hl=en