code: public List<Rc> sortByTitleAndFilterDoubles(List<Rc> rcList) {
      List<Rc> result = new ArrayList<Rc>();
      List<Rc> sorted = new ArrayList<Rc>();
      sorted.addAll(rcList);
      Collections.sort(sorted, new Comparator<Rc>() {
        @Override
        public int compare(Rc lRc, Rc rRc) {
          int result = lRc.getTitle().compareTo(rRc.getTitle());
          if (result == 0) {
            result = rRc.getTimestamp().compare(lRc.getTimestamp());
          }
          return result;
        }
      });
      Rc previous = null;
      for (Rc rc : sorted) {
        if (previous == null || (!rc.getTitle().equals(previous.getTitle()))) {
          result.add(rc);
        }
        previous = rc;
      }
      Collections.sort(result, new Comparator<Rc>() {
        @Override
        public int compare(Rc lRc, Rc rRc) {
          int result = rRc.getTimestamp().compare(lRc.getTimestamp());
          return result;
        }
      });
      return result;
    }
docs: sort the given List by title and filter double titles
  
  @param rcList
  @return