static L<S> snippetsWithTitles(L<S> ids) {
  final SS map = getSnippetTitles_cached(ids);
  ret map(func(S id) { fsI(id) + " - " + map.get(fsI(id)) }, ids);
}

static S snippetsWithTitles(S... ids) {
  ret join(", ", snippetsWithTitles(asList(ids)));
}