sclass CombinedList<A> extends RandomAccessAbstractList<A> {
  int size;
  new LL<A> lists;
  
  *() {}
  
  void addList(L<A> l) {
    lists.add(l);
    size += l(l);
  }
  
  public int size() { ret size; }
  
  public A get(int index) {
    int idx = 0;
    for (L<A> l : lists) {
      int j = idx+l(l);
      if (index < j)
        ret l.get(index-idx);
      idx = j;
    }
    throw new NoSuchElementException;
  }
}