std::map < int , std::set<std::string> >  myString;

1=> "set1"
1=> "set2"
2=> "set1"
2=> "set2"

1=>
  set1=> "Hello"
  set1=> "Hey"
  set1=> "Wow"
1=>
  set2=> "Hello"
  set2=> "Hey"
  set2=> "Wow"
2=>

  set1=> "Hello"
  set1=> "Hey"
  set1=> "Wow"
2=>
  set2=> "Hello"
  set2=> "Hey"
  set2=> "Wow"

std::map < std::set<std::string>, std::string >  myString;