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Department of Computer Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Natural Science Foundation of China (60932008 and 60871092); Fundamental Research Funds for the Central Universities (HIT.ICRST.2010 022); Returned Scholar Foundation of Educational Department of Heilongjiang Province (1154hz26); Natural Science Foundation (Grant CCF-0546345 to Y.H.).