Proof, clear a experiment

[Michaelwet]

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https://bbs.pku.edu.cn/v2/jump-to.php?ur...rust-54090
http://ezproxy.cityu.edu.hk/login?url=ht...eper-54311
http://ezproxy.cityu.edu.hk/login?url=ht...-end-18003
http://ezproxy.cityu.edu.hk/login?url=ht...h-it-59428
https://bbs.pku.edu.cn/v2/jump-to.php?ur...t-04-34862
http://ezproxy.cityu.edu.hk/login?url=ht...-its-66872
https://bbs.pku.edu.cn/v2/jump-to.php?ur...onds-71697
http://ezproxy.cityu.edu.hk/login?url=ht...tute-61841
https://bbs.pku.edu.cn/v2/jump-to.php?ur...usin-22361
https://bbs.pku.edu.cn/v2/jump-to.php?ur...-one-43259