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tokens: We highly appreciate the referee for his/her valuable comments and suggestions that significantly improved our work. J.F.Z. thanks support from the National Natural Science Foundation of China (grant Nos. 11233006 and 11363003). A.L. acknowledges the NSF grant AST 1212096 and the Center for Magnetic Self Organization (CMSO). H.L. and J.C. acknowledge support by the National R D Program through the National Research Foundation of Korea, funded by the Ministry of Education (NRF-2013R1A1A2064475).