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tokens: We are grateful to Georges Meynet, who refereed this paper, for many constructive comments that helped us improve the paper. This work was supported by the Basic Science Research program (NRF-2016R1D1A1A09918398) through the National Research Foundation of Korea (NRF) and by the Korea Astronomy and Space Science Institute under the RD program (Project No. 3348-20160002) supervised by the Ministry of Science and ICT. S.C.Y. acknowledges the support by the Monash Center for Astrophysics via the distinguished visitor program.