《左传·文公·文公二年》
夏季六月，公孙敖与宋公、陈侯、郑伯、晋国的士縠在垂陇结盟。
夏六月，公孙敖会宋公、陈侯、郑伯、晋士縠盟于垂陇。
In the summer, in June, Gongsun Ao formed an alliance with Duke Song, Marquis Chen, Earl Zheng, and Shihu of Jin in Chuilong.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 夏六月，公孙敖会宋公、陈侯、郑伯、晋士縠盟于垂陇。 [/INST] In the summer, in June, Gongsun Ao formed an alliance with Duke Song, Marquis Chen, Earl Zheng, and Shihu of Jin in Chuilong.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 夏六月，公孙敖会宋公、陈侯、郑伯、晋士縠盟于垂陇。
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In the summer, in June, Gongsun Ao formed an alliance with Duke Song, Marquis Chen, Earl Zheng, and Shihu of Jin in Chuilong.
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