#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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