static <A> L<IterableIterator<A>> splitIterator(final int n, final Iterator<A> it) {
  class SplitIterator {
    final int[] positions = repIntAsArray(n, -1);
    CircularArrayList<A> buffer;
    int first;
  
    L<IterableIterator<A>> iterators() {
      new L<IterableIterator<A>> l;
      for _i to n: {
        final int i = _i;
        l.add(iteratorFF(func {
          positions[i]++;
          updateBuffer();
          ret buffer.get(positions[i]-first);
        }));
      }
      ret l;
    }
    
    int last() { ret first+l(buffer); }
    
    void updateBuffer {
      int min = min(positions), max = max(positions);
      while (min > first) { buffer.remove(0); ++first; }
      while (max > last()) buffer.add(it.next());
    }
  }
  ret new SplitIterator().iterators();
}