Mathematical olympiad series-lecture notes on mathematical olympiad courses vol VIII by Xu Jiagu pdf
https://drive.google.com/file/d/1lfdceNnRlu78Vm2XJ4zvN0kMgqgFOcBi/view?usp=drivesdk
Congurence and similarity problem
https://drive.google.com/file/d/13eFYoWZEDNPqFeOyQaQDdlqXXJcpD3hA/view?usp=drivesdk
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