text: #include <set>
  #include "printer.h"
  
  using namespace std;
  
  int main() {
      set<int> a = {1, 1, 2, 2, 3};
      multiset<int> b = {1, 1, 2, 2, 3};
  
      cout << "set: " << a << endl;
      cout << "multiset: " << b << endl;
  
      return 0;
  }
  