第五十条 有下列行为之一的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留，可以并处一千元以下罚款：
Microsoft Office Home & Business for Mac 2021: Lifetime License
，更多细节参见51吃瓜
简易计税方法的销售额=含税销售额÷（1+征收率）
It is worth noting, too, that humans often follow a less rigorous process compared to the clean room rules detailed in this blog post, that is: humans often download the code of different implementations related to what they are trying to accomplish, read them carefully, then try to avoid copying stuff verbatim but often times they take strong inspiration. This is a process that I find perfectly acceptable, but it is important to take in mind what happens in the reality of code written by humans. After all, information technology evolved so fast even thanks to this massive cross pollination effect.