Mon, 13 Feb 2012 15:42:45 +0000 urbanc proof idea
Mon, 13 Feb 2012 15:35:08 +0000 urbanc added implementation section
Mon, 13 Feb 2012 10:57:47 +0000 urbanc merged Xingyuan's changes
Mon, 13 Feb 2012 10:44:42 +0000 urbanc polished
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