https://git-scm.com/book/zh/v2/Appendix-A%3A-%E5%85%B6%E5%AE%83%E7%8E%AF%E5%A2%83%E4%B8%AD%E7%9A%84-Git-%E5%9B%BE%E5%BD%A2%E7%95%8C%E9%9D%A2

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