multimap<string , string> m;
m.insert(make_pair("12","3234"));
m.insert(make_pair("12","3234"));
m.insert(make_pair("12","3234"));

multimap<string , string> m;
m.insert(make_pair("12","3234"));
m.insert(make_pair("12","3234"));
m.insert(make_pair("12","3234"));

for (auto x:m){
    cout<<x.first<<"   "<<x.second<<endl;
}