《汉书·传·叙传上》
二十岁时，适逢王莽被减，光武帝在冀州即位。
年二十，遭王莽败，世祖即位于冀州。
At the age of twenty, Wang Mang was reduced and Emperor Guangwu ascended the throne in Jizhou.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 年二十，遭王莽败，世祖即位于冀州。 [/INST] At the age of twenty, Wang Mang was reduced and Emperor Guangwu ascended the throne in Jizhou.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 年二十，遭王莽败，世祖即位于冀州。
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At the age of twenty, Wang Mang was reduced and Emperor Guangwu ascended the throne in Jizhou.
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