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Question #130 Difficulty: 3

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

    #include <iostream>
using namespace std;

template<typename T>
void adl(T)
{
  cout << "T";
}

struct S
{
};

template<typename T>
void call_adl(T t)
{
  adl(S());
  adl(t);
}

void adl(S)
{
  cout << "S";
}

int main ()
{
  call_adl(S());
}

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