@Test
  public void randomWalk() throws JWNLException {
    long start = System.currentTimeMillis();

    POS pos = POS.getPOSForId(r.nextInt(4) + 1);
    Synset s = d.getSynsetIterator(pos).next();

    for (int i = 0; i < 10000; i++) {
      List<Pointer> ptrs = s.getPointers();
      PointerTarget p = ptrs.get(r.nextInt(ptrs.size())).getTarget();
      s = p.getSynset();
    }

    for (int i = 0; i < 10000; i++) {
      IndexWord w = d.getRandomIndexWord(pos);
    }

    long end = System.currentTimeMillis();
    System.out.println("Walk (ms):\t" + (end - start));
  }
  @Test
  public void iterateAll() throws JWNLException {
    long start = System.currentTimeMillis();

    for (POS pos : POS.getAllPOS()) {
      Iterator<Exc> ie = d.getExceptionIterator(pos);
      while (ie.hasNext()) {
        ie.next();
      }

      Iterator<IndexWord> ii = d.getIndexWordIterator(pos);
      while (ii.hasNext()) {
        ii.next();
      }

      Iterator<Synset> si = d.getSynsetIterator(pos);
      while (ii.hasNext()) {
        si.next();
      }
    }

    long end = System.currentTimeMillis();
    System.out.println("Iteration (ms):\t" + (end - start));
  }