- #include <iostream> 
- using namespace std; 
-   
- int main() { 
- 	std::endl(std::operator<<(std::cout, "Hello World!")); 
- 	std::operator<<(std::cout, "Hello World!").operator<<(std::endl); 
- 	std::operator<<(std::operator<<(std::cout, "Hello World!"), '\n'); 
- 	std::operator<<(std::operator<<(std::cout, "Hello World!"), "\n"); 
- 	std::operator<<(std::operator<<(std::cout, "Hello World!"), string("\n")); 
- 	return 0; 
- } 
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