#include <iostream>
#include <string>
struct Hello{
int a;
Hello():a(0){}
int world(){
return ++a;
}
};
int main()
{
Hello test;
std::cout << test.world() << std::endl;
std::cout << test.world() << std::endl;
std::cout << test.world() << std::endl;
std::cout << test.world() << std::endl;
}
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