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tokens: We thank the referee for the very helpful suggestions that have significantly improved our manuscript. We acknowledge financial support from the 973 Program of China under grant 2013CB837000, the National Natural Science Foundation of China (No. 11573060), the Key Laboratory of Astroparticle Physics of Yunnan Province (No. 2016DG006), the Strategic Priority Research Program, and the Emergence of Cosmological Structure of the Chinese Academy of Sciences, Grant No. XDB09000000. The work of D.H.Y. is supported by CAS “Light of West China” Program.