private List<String> listToLowerCase(List<String> l){
  List<String> result=new ArrayList<String>();
  for (  String s : l) {
    result.add(s.toLowerCase());
  }
  return result;
}

private List < String > listToLowerCase ( List < String > l ) { List < String > result = new ArrayList < String > ( ) ; for ( String s : l ) { result . add ( s . toLowerCase ( ) ) ; } return result ; }
converts a list of strings to lower case strings .
