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誰のために希望描こう？
#-17781: LFCode
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无限拓展的玛瑙星空之下，少女伫立着倾听风的声音。
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我叫 lichenxi111，我是你爹，不服来打我
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$$|X/G| = \frac{1}{|G|}\sum_{g \in G}|X^g|$$
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