2.23.140.1.2.1 in this case:
The three levels of tax
，详情可参考新收录的资料
In a true “clean room” implementation, you isolate some people from any access to existing source code, and you tell them to write a similar program. You can never truly do that with open source software, because it’s ubiquitously accessible. But if you examine the source code and compare new vs. old, it’s clear if someone was just mechanically copying things and doing some light variable-renaming.，详情可参考新收录的资料
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