#include <iostream>
#include <string>
using namespace std;
int main() {
string a;
string b = " ";
a[0] = 'h';
a[1] = 'i';
b[0] = 'h';
b[1] = 'i';
cout << "a contains " << a << endl; //a does not work!
cout << "b contains " << b << endl;
}
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