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Question #32 Difficulty: 2

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

    #include <iostream>

struct X {
  X() { std::cout << "a"; }
  X(const X &x) { std::cout << "b"; }
  const X &operator=(const X &x) {
    std::cout << "c";
    return *this;
  }
};

int main() {
  X x;
  X y(x);
  X z = y;
  z = x;
}

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