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Question #287 Difficulty: 2

According to the C++23 standard, what is the output of this program? 

    #include <string>
#include <iostream>

int main() {
  using namespace std::string_literals;
  std::string s1("hello world",5);
  std::string s2("hello world"s,5);

  std::cout << s1 << s2;
}

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