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The P versus NP problem is one of the most important problems in computer science.
写作是唯一一个如果你赚不到钱也没人会觉得你可笑的职业。
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
Gratitude is an antidote to negative emotions, a neutralizer of envy, hostility, worry, and irritation.