public static String addSentenceMarkers(String s){
  return Vocabulary.START_SYM + " " + s+ " "+ Vocabulary.STOP_SYM;
}

public static String addSentenceMarkers ( String s ) { return Vocabulary . START_SYM + " " + s + " " + Vocabulary . STOP_SYM ; }
wrap sentence with sentence start / stop markers as defined by vocabulary ; separated by a single whitespace .
