#include <iostream>

int main()
{
	for (int i = 0; i < 10; i++)
	{
    	std::cout<< "i: "<< i<< '\n';
    	for (int j = 0; j < i; j++)
    	{
    	    std::cout<< "j: "<< j<<  '\n';
    	}
    	std::cout<< "\n\n";
	}
	return 0;
}