static <A> L<A> selectRandomWithMultiples(int n, L<A> list) {
  ret selectRandomWithMultiples(list, n);
}

static <A> L<A> selectRandomWithMultiples(L<A> list, int n) {
  if (empty(list)) null;
  new L<A> l;
  repeat n {
    l.add(random(list));
  }
  ret l;
}