Five hundred mathematical challenges
https://drive.google.com/file/d/1D5LhEnK6kavgOXhxse-N-bLFrdx0Bpf6/view?usp=drivesdk
Congurence and similarity problem
https://drive.google.com/file/d/13eFYoWZEDNPqFeOyQaQDdlqXXJcpD3hA/view?usp=drivesdk
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