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一個問題如果在計算機上可以快速解決，那么它屬于P類問題；如果一個解可以快速驗證，那么它屬于NP類問題。

The only thing that separates successful people from the others is hard work and determination.

The ruling class has the means of material production at its disposal; the proletariat has nothing but their labor power.

內省是唯一可以直接觀察心靈的方法。