#include <iostream>
#include <string>
#include <map>
using namespace std;
struct S
{
map<string, string> m;
S()
{
m["key"] = "b";
}
const string &func() const
{
return m.find("key")->second;
}
};
int main()
{
for (char c : S().func())
cout << c;
return 0;
}
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