public Set<String> values(){
  Set<String> values=new HashSet<String>();
  for (  String key : codes.keySet()) {
    values.add(codes.getString(key));
  }
  return values;
}

public Set < String > values ( ) { Set < String > values = new HashSet < String > ( ) ; for ( String key : codes . keySet ( ) ) { values . add ( codes . getString ( key ) ) ; } return values ; }
return all known values
