int main()
{
  int n1, n2, n3, n4, n5;

  [&, n1, n2] {}; //n3, n4, n5 reference || n1, n2 copy

  [=, &n1, &n2] {}; // n3, n4, n5 copy || n1, n2 reference


  [n1, n1] {}; // Error!! Already Use Same variable!
  [&, &n1] {}; // Error!! Already Use Default Reference
  [=, n1] {} // Error!! Already Use Default Copy
}