docs: public static void main(String[] args) {
      TreebankLanguagePack tlp = new PennTreebankLanguagePack();
      System.out.println("Start symbol: " + tlp.startSymbol());
      String start = tlp.startSymbol();
      System.out.println("Should be true: " + (tlp.isStartSymbol(start)));
      String[] strs = {"-", "-LLB-", "NP-2", "NP=3", "NP-LGS", "NP-TMP=3"};
      for (String str : strs) {
        System.out.println("String: " + str + " basic: " + tlp.basicCategory(str) + " basicAndFunc: " + tlp.categoryAndFunction(str));
      }
    }