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tokens: We thank the anonymous referee for a thorough report and many constructive comments, which helped us improve the presentation of this work. This work is supported by the 973 program (2015CB857005, 2012CB821804), the NSFC (11522324,11421303), the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences, grant No. XDB09010400 and the Fundamental Research Funds for the Central Universities. H.J.M. would like to acknowledge the support of NSF AST-1517528. The numerical calculations were done on the supercomputing system in the Supercomputing Center of the University of Science and Technology of China.