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tokens: This work is supported by NSFC grants under contracts 41774157, 41231069, 41231068, 41474147, 41574168, and 41421003, and the Specialized Research Fund for State Key Laboratories. The work was carried out at National Supercomputer Center in Tianjin, China and the calculations were performed on TianHe-1 (A). The authors appreciate the invaluable suggestions and comments that were provided by the anonymous reviewer. Special thanks go to Dr. Xiang in our laboratory for the instructive discussions and helpful suggestions to amend the paper.