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The authors are grateful to Sergey Fomel for inspiring discussions. We thank the associate editor, Joseph Dellinger, and four anonymous reviewers for helpful suggestions, which improved the quality of the paper. This work is supported by National Natural Science Foundation of China (Grant No. 41774127 and 41522404) and National Key Research and Development Program of China (Grant No. 2016YFC0600505). All results are reproducible in the Madagascar open-source software environment (Fomel et al., 2013).