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Question #145 Difficulty: 2

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

struct E
{
  E() { std::cout << "1"; }
  E(const E&) { std::cout << "2"; }
  ~E() { std::cout << "3"; }
};

E f()
{ 
  return E();
}

int main()
{
  f();
}

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