static <A> L<A> takeFirst_clone(L<A> l, int n) {
  ret cloneSubList(l, 0, n);
}

static <A> L<A> takeFirst_clone(int n, L<A> l) {
  ret takeFirst_clone(l, n);
}

static <A> L<A> takeFirst_clone(int n, Iterable<A> i) {
  L l = new L;
  Iterator<A> it = i.iterator();
  repeat n { if (it.hasNext()) l.add(it.next()); else break; }
  ret l;
}