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tokens: We thank Lisa Kewley, Renbin Yan, Shude Mao, Junqiang Ge, Jong-Hak Woo, and Chun Lyu for helpful discussions and suggestions. We thank an anonymous referee for helpful suggestions that improved the paper significantly. The research presented here is partially supported by the 973 Program of China under grants No. 2013CB834905 and No. 2009CB824800, by the National Natural Science Foundation of China under grants No. 11073040, by the Strategic Priority Research Program “The Emergence of Cosmological Structures” of Chinese Academy of Sciences, Grant No. XDB09000000, and by Shanghai Pujiang Talents Program under grant No. 10pj1411800. K.Z. acknowledge the support by the No. 53 China Post-doc general Fund under grants No. 2013M531232. Funding for the Sloan Digital Sky Survey (SDSS) has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Aeronautics and Space Administration, the National Science Foundation, the U.S. Department of Energy, the Japanese Monbukagakusho, and the Max Planck Society. The SDSS is managed by the Astrophysical Research Consortium (ARC) for the Participating Institutions. The SDSS website is http://www.sdss.org/.