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In page City Wall of Nanjing:
"Igandon wall belonged to a military defensive system too. The difference was that it adopted a winding, free style, based on the city's complicated topography. Construction of the Beijing and the Xi'an city walls was in the ancient style of square or rectangular design. When it was built by the second son of Emperor Zhu Yuanzhang, the 12-kilometre long Xi'an city wall became the seat of local government. It could not match the scale of the capital Nanjing at that time.
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