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tokens: J.R. acknowledges Dr. Aoki for providing the Subaru spectrum for G64-12. This research was supported by the National Key Basic Research Program of China under grant No. 2014CB845700 and the National Natural Science Foundation of China under grants No. 11473033 and 11603037. This work is also supported by the Astronomical Big Data Joint Research Center, co-founded by the National Astronomical Observatories, Chinese Academy of Sciences and the Alibaba Cloud.